Glossary Of Terms 3

Front 1

Groundwater

Back 1

That water that is available from a well, driven into water-bearing subsurface strata (aquifer).

Front 2

Group

Back 2

A supervisory level established to divide the incident into functional areas of operation.

Front 3

Group

Back 3

Established to divide the incident management structure into functional assignments of operation. (See also, 3.3.27 Division.)

Front 4

Group A

Back 4

Acetylene.

Front 5

Group B

Back 5

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value less than or equal to 0.45 mm or a minimum igniting current ratio (MIC ratio) less than or equal to 0.40. Note: A typical Class I, Group B material is hydrogen.

Front 6

Group C

Back 6

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.45 mm and less than or equal to 0.75 mm, or a
minimum igniting current ratio (MIC ratio) greater than 0.40 and less than or equal to 0.80. Note: A typical Class I, Group C material is ethylene.

Front 7

Group D

Back 7

Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.75 mm or a minimum igniting current ratio (MIC ratio) greater than 0.80. Note: A typical Class I, Group D material is propane.

Front 8

Group E

Back 8

Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similar hazards in the use of electrical equipment.

Front 9

Grouped

Back 9

Cables or conductors positioned adjacent to one another but not in continuous contact with each other.

Front 10

Group F

Back 10

Atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles (see ASTM D 3175, Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke, for coal and coke dusts) or that have been sensitized by other materials so that they present an explosion hazard. Coal, carbon black, charcoal, and coke dusts are examples of carbonaceous dusts.

Front 11

Group G

Back 11

Atmospheres containing other combustible dusts, including flour, grain, wood flour, plastic, and chemicals.

Front 12

Group I Flame Effect

Back 12

An attended, manually controlled flame effect.

Front 13

Group IIA

Back 13

Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, or flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.90 mm or minimum igniting current ratio (MIC ratio) greater than 0.80.

Front 14

Group IIB

Back 14

Atmospheres containing acetaldehyde, ethylene, or flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either maximum experimental safe gap (MESG) values greater than
0.50 mm and less than or equal to 0.90 mm or minimum igniting current ratio (MIC ratio) greater than 0.45 and less than or equal to
0.80.

Front 15

Group IIC

Back 15

Atmospheres containing acetylene, hydrogen, or flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value less than or equal to
0.50 mm or minimum igniting current ratio (MIC ratio) less than or equal to 0.45.

Front 16

Group II Flame Effect

Back 16

An individual or group flame effect designed for unattended operation that is temporarily or permanently installed outside any structure.

Front 17

Group III Flame Effect

Back 17

An attended, temporarily installed flame effect for a specific production with limited operation and fixed time for removal.

Front 18

Group IV Flame Effect

Back 18

A large individual or group flame effect that is permanently installed inside or outside any structure designed for unattended operation without a main show supervisory control system.

Front 19

Group Supervisor

Back 19

A person in a supervisory level position responsible for a functional area of operation.

Front 20

Group V Flame Effect

Back 20

A large individual or group flame effect that is temporarily or permanently installed inside or outside any structure and is designed for intermittent or continuous operation under the supervision of a main show control system but without full-time supervision by a technician.

Front 21

Group VI Flame Effect

Back 21

A large individual or group flame effect that is temporarily or permanently installed inside or outside any structure and is designed for intermittent operation under the supervision of a main show control system and a technical director, with cast members in close proximity to the effect at the time of operation.

Front 22

Group VII Flame Effect

Back 22

An individual flame effect that can be temporarily or permanently installed inside or outside any structure that, due to its unique operating requirements, does not fit into any other classification.

Front 23

Growth Time (tg)

Back 23

The time interval from the time of effective ignition until the heat release rate of the fire is 1000 Btu/sec (1055 kW).

Front 24

GSA KKK Specifications

Back 24

A set of federal specifications relating to purchasing requirements for ambulance design and manufacture.

Front 25

Guard

Back 25

A vertical protective barrier erected along exposed edges of stairways, balconies, and similar areas.

Front 26

Guard

Back 26

Part of a machine specifically used to provide protection by means of a physical barrier.

Front 27

Guarded

Back 27

Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.

Front 28

Guarded

Back 28

Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger. [70, 2005]

Front 29

Guarded

Back 29

Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger. [70, 2008]

Front 30

Guarded Motor

Back 30

An open motor in which all openings giving direct access to live metal or rotating parts (except smooth rotating surfaces) are limited in size by the structural parts or by screens, baffles, grilles, expanded metal, or other means to prevent accidental contact with hazardous parts. Openings giving direct access to such live or rotating parts shall not permit the passage of a cylindrical rod 19 mm (0.75 in.) in diameter.

Front 31

Guard’s Tour Reporting
Station

Back 31

A device that is manually or automatically initiated to indicate the route being followed and the timing of a guard’s tour. (SIG-IDS)

Front 32

Guard’s Tour Supervisory
Signal

Back 32

A supervisory signal monitoring the performance of guard patrols. (SIG-PRO)

Front 33

Guest

Back 33

Person hiring or occupying a room for living or sleeping, not included in a family.

Front 34

Guest Room

Back 34

An accommodation combining living, sleeping, sanitary, and storage facilities within a compartment.

Front 35

Guest Room

Back 35

An accommodation combining living, sleeping, sanitary, and storage facilities within a compartment. [101, 2006] (SIG-HOU)

Front 36

Guest Suite

Back 36

An accommodation with two or more contiguous rooms comprising a compartment, with or without doors between such rooms, that provides living, sleeping, sanitary, and storage facilities.

Front 37

Guest Suite

Back 37

An accommodation with two or more contiguous rooms comprising a compartment, with or without doors between such rooms, that provides living, sleeping, sanitary, and storage facilities. [101, 2006] (SIG-HOU)

Front 38

Guide

Back 38

A document that is advisory or informative in nature and that contains only nonmandatory provisions. A guide may contain mandatory statements such as when a guide can be used, but the document as a whole is not suitable for adoption into law.

Front 39

Guide Rail (Sliding Door, Vertical)

Back 39

A steel member attached to the wall or frame used with vertical sliding doors to guide the door.

Front 40

Guide (Rolling Doors)

Back 40

Vertical assembly in which the curtain travels and that is fastened to the jamb, retaining the edges of the door curtain, and closing the space between the curtain, edges and the jamb.

Front 41

Guide Shoe (Sliding Door, Vertical)

Back 41

A member attached to vertical sliding doors used to guide and retain the door on the guide rail.

Front 42

Guide Wall Angle (Rolling
Steel Doors)

Back 42

The component of the guide assembly that is fastened to the jamb.

Front 43

Guideway

Back 43

That portion of the transit or passenger rail line included within right-of-way fences, outside lines of curbs or shoulders, underground tunnels and stations, cut or fill slopes, ditches, channels, and waterways, and including all appertaining structures.

Front 44

Gunwale

Back 44

The upper edge of a side of a vessel or boat designed to prevent items from being washed overboard.

Front 45

GVWR (Gross Vehicle Weight
Rating)

Back 45

The final stage manufacturer’s specified maximum load-carrying capacity of a vehicle having two axle systems (a multiaxle axle installation is one system).

Front 46

Gypsum Base for Veneer
Plaster

Back 46

A gypsum board used as the base for application of a gypsum veneer plaster.

Front 47

Gypsum Board

Back 47

The generic name for a family of sheet products consisting of a noncombustible core primarily of gypsum with paper surfacing.

Front 48

Gypsum Lath

Back 48

A gypsum board used as the base for application of gypsum plaster.

Front 49

Gypsum Panel Products

Back 49

The general name for a family of sheet products consisting essentially of gypsum.

Front 50

Gypsum Plaster

Back 50

The generic name for a family of powdered cementitious products consisting primarily of calcined gypsum with additives to modify physical characteristics, and having the ability, when mixed with water, to produce a plastic mortar or slurry that can be formed to the desired shape by various methods and subsequently sets to a hard, rigid mass.

Front 51

Gypsum Veneer Plaster

Back 51

A calcined gypsum plaster specially manufactured to provide high strength, hardness, and abrasion resistance when applied in thin coats over a gypsum base for veneer plasters.

Front 52

Gypsum Wallboard

Back 52

A gypsum board used primarily as an interior surfacing for building structures.

Front 53

Habitable Room

Back 53

A room in a residential occupancy used for living, sleeping, cooking, and eating, but excluding bath, storage and service area, and corridors.

Front 54

Habitable Room

Back 54

A room or enclosed floor space arranged for living, eating, food preparation, or sleeping purposes that does not include bathrooms, toilet compartments, laundries, pantries, foyers, hallways, and other accessory floor space.

Front 55

Halocarbon

Back 55

A halogenated agent whose chemical name is inclusive of one or more of the following: hydrochlorofluorocarbon (HCFC), hydrofluorocarbon (HFC), or perfluorocarbon (PFC) based halogenated agents.

Front 56

Halocarbon Agent

Back 56

An agent that contains as primary components one or more organic compounds containing one or more of the elements fluorine, chlorine, bromine, or iodine.

Front 57

Halocarbons

Back 57

Halocarbon agents include hydrochlorofluorocarbon (HCFC), hydrofluorocarbon (HFC), perfluorocarbon (PFC), and fluoroiodocarbon (FIC) types of agents.

Front 58

Halogenated Agent

Back 58

A liquefied gas extinguishing agent that extinguishes fire by chemically interrupting the combustion reaction between fuel and oxygen. Halogenated agents leave no residue.

Front 59

Halogenated Agent

Back 59

Bromochlorodifluoromethane (Halon 1211), bromotrifluoro- methane (Halon 1301), and mixtures of Halon 1211 and Halon 1301.

Front 60

Halogenated Agents

Back 60

Agents that are complementary agents including halocarbons and halons.

Front 61

Halogenated Agents

Back 61

Halogenated agents referenced in this standard are either halons [i.e., bromotrifluoromethane (Halon 1301), bromochlorodifluoromethane (Halon 1211), and mixtures of Halon 1211 and Halon 1301 (Halon
1211/1301)] or halocarbon agents [i.e., hydrochlorofluorocarbon (HCFC), HFC (hydrofluorocarbon), or perfluorocarbon (PFC) based halogenated agents].

Front 62

Halogenated Agents

Back 62

Halogenated (clean) agents referenced in this standard are of the following types.

Front 63

Halogenated Closed Recovery
System

Back 63

A system that provides for the transfer of halogenated agents between fire extinguishers, supply containers, and recharge and recovery containers
so that none of the halogenated agent escapes to the atmosphere. Closed recovery systems for halogenated agents with an ozone depleting potential (ODP) of 0.2 or greater shall be listed for use with that agent. The system’s supply or recharge and recovery container is capable of maintaining the agent in a sealed environment until it is reused or returned to the agent manufacturer.

Front 64

Halon 1211

Back 64

A halogenated agent whose chemical name is bromochlorodifluoromethane, CBrClF2, and that is a multipurpose, Class ABC-rated agent effective against flammable liquid fires.
[408, 2004]

Front 65

Halon 1211

Back 65

A halogenated agent whose chemical name is bromochlorodifluoromethane (CBrClF2) and that is a multipurpose Class ABC-rated agent effective against flammable liquid fires. [402:3.3]

Front 66

Halon 1301

Back 66

A halogenated agent whose chemical name is bromotrifluoromethane (CBrF3) that is recognized as an agent having Class ABC capability in total flooding systems. [402:3.3]

Front 67

Halon 1301

Back 67

A halogenated agent whose chemical name is bromotrifluoromethane, CBrF3, and that is recognized as an agent having Class ABC capability in total flooding systems. [408, 2004]

Front 68

Halons

Back 68

Halons include bromochlorodifluoromethane (Halon 1211), bromotrifluoromethane (Halon 1301), and mixtures of Halon 1211 and Halon 1301 (Halon 1211/1301).

Front 69

Halter

Back 69

A piece of equipment, composed of rope or straps and buckles, that fits securely around the head of an animal such as a horse or cow, used in handling and leading animals from place to place.

Front 70

Halyard

Back 70

Rope used on extension ladders for the purpose of raising a fly section(s).

Front 71

Halyard

Back 71

Rope used on extension ladders for the purpose of raising a fly section(s). [1931:3.3]

Front 72

Hand-Fired Grate

Back 72

A grate on which fuel is placed manually, usually by means of a shovel.

Front 73

Handheld Electrical Firing
Unit

Back 73

A small, handheld unit with manually operated switches that control the flow of electric current to electric matches attached to fireworks devices.

Front 74

Handhold Device or Grab Rail

Back 74

Any fitting, assembly, or device, other than a lifeline or deck rail, that is intended for grasping with the hand.

Front 75

Handhole Enclosure

Back 75

An enclosure for use in underground systems, provided with an open or closed bottom, and sized to allow personnel to reach into, but not enter, for the purpose of installing, operating, or maintaining equipment or wiring or both.

Front 76

Hand Hose Line System

Back 76

A hose and nozzle assembly connected by fixed piping or connected directly to a supply of extinguishing agent.

Front 77

Hand Hose Line System

Back 77

A hose and nozzle assembly connected by fixed piping or connected directly to a supply of extinguishing agent. [122, 2004]

Front 78

Hand Hose Line System

Back 78

A hose and nozzle assembly connected by fixed piping or connected directly to a supply of extinguishing agent. [122:3.3]

Front 79

Handline

Back 79

A hose and nozzle that can be held and directed by hand.

Front 80

Handline Nozzle

Back 80

A nozzle with a rated discharge of less than 1325 L/min (350 gpm).

Front 81

Handling

Back 81

Any activity, including processing, that can expose the metal’s surface to air or any other substance capable of reacting with the metal under the conditions of the exposure.

Front 82

Handling

Back 82

The deliberate movement of material by any means to a point of storage or use.

Front 83

Handling

Back 83

The deliberate movement of material in containers by any means to a point of storage or use.

Front 84

Handrail

Back 84

A bar, pipe, or similar member designed to furnish persons with a handhold.

Front 85

Handwashing Facility

Back 85

A facility providing an adequate supply of running potable water, soap, and single-use towels or hot-air drying machines.

Front 86

Hangar Building Cluster

Back 86

A group of buildings with more than one area for the storage and servicing of aircraft and all attached or contiguous structures, or structures not separated as specified in 8.3.1 of this standard, as appropriate.

Front 87

Hangar Fire Area

Back 87

An area within an aircraft hangar subject to loss by a single fire because of lack of internal subdivisions as specified in Section 5.2 or
8.2 of this standard, as appropriate.

Front 88

Hanger (Sliding Door, Horizontal)

Back 88

A member used to attach a horizontally sliding door to the track and to cause the door to roll on or in the track.

Front 89

Hardboard

Back 89

A fibrous-felted, homogeneous panel made from lignocellulosic fibers consolidated under heat and pressure in a hot press to a density not less than 31 lb/ft3 (497 kg/m3).

Front 90

Hard Suction Hose

Back 90

A hose used for drafting water from static supplies (lakes, rivers, wells, and so forth). It can also be used for supplying pumps on fire apparatus from hydrants if designed for that purpose. The hose contains a semirigid or rigid reinforcement designed to prevent collapse of the hose under vacuum.

Front 91

Hardware

Back 91

Nonfabric components of protective clothing or equipment including, but not limited to, those made of metal or plastic.

Front 92

Hardware

Back 92

Nonfabric components of the flame-resistant garment including, but not limited to, those made of metal or plastic.

Front 93

Hardware

Back 93

Nonfabric components of the protective clothing and equipment including, but not limited to, those made of metal or plastic.

Front 94

Hardware

Back 94

Nonfabric components of the protective clothing or equipment, including, but not limited to, those made of metal or plastic.

Front 95

Hardware

Back 95

Nonfabric components of the protective garment including, but not limited to, those made of metal or plastic.

Front 96

Hardware

Back 96

Rigid mechanical auxiliary equipment that can include, but is not limited to, anchor plates, carabiners, and mechanical ascent and descent control devices.

Front 97

Hardware

Back 97

Rigid mechanical auxiliary equipment that can include, but is not limited to, anchor plates, carabiners, and mechanical ascent and descent control devices. [1670, 2004]

Front 98

Hardwood

Back 98

Any close-grained wood such as oak, maple, ash, or hickory that is free from loose knots, wind shakes, or similar defects.

Front 99

Harmonics

Back 99

Those voltages or currents whose frequencies are integer multiples of the fundamental frequency.

Front 100

Hauling System

Back 100

A rope system generally constructed from life safety rope, pulleys, and other rope rescue system components capable of lifting or moving a load across a given area.

Front 101

Hawse Pipe

Back 101

A cylindrical or elliptical pipe or casting in a vessel’s hull through which the anchor rode runs and within which the anchor shank can be housed.

Front 102

Hazard

Back 102

A condition, situation, attitude, or action that creates or increases expected loss frequency or severity.

Front 103

Hazard

Back 103

A condition that presents the potential for harm or damage to people, property, or the environment.

Front 104

Hazard

Back 104

A fuel complex defined by kind, arrangement, volume, condition, and location, that determines the ease of ignition and/or of resistance to fire control. [1144, 2002]

Front 105

Hazard

Back 105

Any arrangement of materials and heat sources that presents the potential for harm, such as personal injury or ignition of combustibles.

Front 106

Hazard

Back 106

Any arrangement of materials and heat sources that presents the potential for harm, such as personal injury or ignition of combustibles. [921, 2004]

Front 107

Hazard

Back 107

A source of possible injury or damage to health.

Front 108

Hazard

Back 108

A source of possible injury or damage to health. [79, 2007]

Front 109

Hazard

Back 109

That which is capable of posing an unreasonable risk to health, safety, or the environment; capable of causing harm.

Front 110

Hazard

Back 110

The potential for harm or damage to people, property, or the environment.

Front 111

Hazard Analysis

Back 111

A documented assessment performed by personnel knowledgeable of the specific hazards of the material that is acceptable to the AHJ.

Front 112

Hazard Area

Back 112

An area with specific, established fuel loads and fire hazard characteristics.

Front 113

Hazard Area

Back 113

The area made hazardous by the operation of the flame effect.

Front 114

Hazard Assessment

Back 114

The process by which an organization identifies hazards in the workplace and then determines appropriate controls, including the use of personal protective equipment, to eliminate or reduce worker exposure to those hazards.

Front 115

Hazard Assessment System

Back 115

A system to evaluate and rate pertinent factors such as fire and weather history, fuels, improvements, topography and access to develop and implement mitigation strategies.

Front 116

Hazard Current

Back 116

For a given set of connections in an isolated power system, the total current that would flow through a low impedance if it were connected between either isolated conductor and ground.

Front 117

Hazard Current

Back 117

For a given set of connections in an isolated power system, the total current that would flow through a low impedance if it were connected between either isolated conductor and ground. (ELS)

Front 118

Hazard/Hazardous

Back 118

Capable of posing an unreasonable risk to health, safety, or the environment; capable of causing harm.

Front 119

Hazard Identification

Back 119

The process of identifying situations or conditions that have the potential to cause injury to people, damage to property, or damage to the environment.

Front 120

Hazard Mitigation

Back 120

Activities taken to isolate, eliminate, or reduce the degree of risk to life and property from hazards, either before, during, or after an incident.

Front 121

Hazardous Area

Back 121

An area of a structure or building that poses a degree of hazard greater than that normal to the general occupancy of the building or structure.

Front 122

Hazardous Area

Back 122

An area of a structure or building that poses a degree of hazard greater than that normal to the general occupancy of the building or structure. [5000, 2003]

Front 123

Hazardous Area

Back 123

An area of a structure or building that poses a degree of hazard greater than that normal to the general occupancy of the building or structure. [5000, 2006]

Front 124

Hazardous Area

Back 124

An area that contains a hazardous atmosphere and those areas of the structures or buildings used for processes that involve quantities of flammable liquids, liquids processed at or above their flash point, flammable gases, or explosive materials that have the potential for catastrophic loss.

Front 125

Hazardous Area

Back 125

For an aircraft, the area inside 23 m (75 ft) from any external surface of the aircraft.

Front 126

Hazardous Area

Back 126

The area where members might be exposed to a hazard or hazardous atmosphere. A particular substance, device, event, circumstance, or condition that presents a danger to members of the fire department.

Front 127

Hazardous Atmosphere

Back 127

Any atmosphere that is oxygen deficient or that contains a toxic or disease-producing contaminant.

Front 128

Hazardous Atmosphere

Back 128

Any atmosphere that is oxygen deficient or that contains a toxic or disease-producing contaminant. [1404, 2006]

Front 129

Hazardous Atmosphere

Back 129

Any atmosphere that is oxygen deficient or that contains a toxic or disease-producing contaminant. [600, 2005]

Front 130

Hazardous Atmospheres

Back 130

Any atmosphere that can expose personnel to the risk of death, incapacitation, injury, acute illness, or impairment of ability to self-rescue. [1006:3.3]

Front 131

Hazardous Atmospheres

Back 131

Any atmosphere that can expose personnel to the risk of death, incapacitation, injury, acute illness, or impairment of ability to self-rescue. [1670, 2004]

Front 132

Hazardous Chemical

Back 132

A chemical with one or more of the following hazard ratings as defined in NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response: Health — 2, 3, or 4; Flammability —
2, 3, or 4; Reactivity — 2, 3, or 4. [99, 2005]

Front 133

Hazardous Chemical

Back 133

A chemical with one or more of the following hazard ratings as defined in NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response: Health — 2, 3, or 4; Flammability —
2, 3, or 4; Reactivity — 2, 3, or 4. (LAB)

Front 134

Hazardous Chemical

Back 134

In semiconductor fabrication facilities, any solid, liquid, or gas that has a degree-of-hazard rating in health, flammability, or reactivity of Class 3 or 4 as ranked by NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response.

Front 135

Hazardous Chemical Storage and Dispensing Room

Back 135

A room used in conjunction with or serving a fabrication area where hazardous chemicals are stored, used, or transferred from vessels in the room through piping systems to a fabrication area.

Front 136

Hazardous (Classified) Location

Back 136

A location that is classified based on the properties of the flammable vapors, liquids, or gases, or combustible dusts or fibers that might be present and the likelihood that a flammable or combustible concentration or quantity is present.

Front 137

Hazardous Condition

Back 137

A circumstance in which a person is exposed to a hazard(s) that has the potential to result in harm immediately or over a long period of time.

Front 138

Hazardous Debris

Back 138

Any debris produced or expelled by the functioning of a pyrotechnic device that is capable of causing personal injury or unpredicted property damage.

Front 139

Hazardous Fluid

Back 139

A liquid or gas that is flammable, toxic, or corrosive.

Front 140

Hazardous Location

Back 140

An area where flammable or combustible gases or liquids or combustible dusts or flyings usually exist.

Front 141

Hazardous Material

Back 141

A chemical or substance that is a physical hazard or health hazard as defined and classified in NFPA 1, Uniform Fire Code, whether the material is in usable or waste condition.

Front 142

Hazardous Material

Back 142

A chemical or substance that is classified as a physical hazard material or a health hazard material, whether the chemical or substance is in usable or waste condition. (See also 3.3.161.5, Health Hazard Material, and 3.3.161.10, Physical Hazard Material.)
[5000, 2009]

Front 143

Hazardous Material

Back 143

A chemical or substance that is classified as a physical hazard material or a health hazard material, whether the chemical or substance is in usable or waste condition. (See also 3.3.391.5.1 Health Hazard Material, and 3.3.391.5.1.1, Physical Hazard Material.)

Front 144

Hazardous Material

Back 144

Any material that is an air-reactive material, flammable or combustible liquid, flammable gas, corrosive material, explosive material, organic peroxide, oxidizing material, radioactive material, toxic material, unstable material, biological material or water-reactive material, and any substance or mixture of substances that is an irritant or a strong sensitizer or that generates pressure through exposure to heat, decomposition, or other means.

Front 145

Hazardous Material

Back 145

Any solid, liquid, gas, or mixture thereof that can potentially cause harm to the human body through respiration, ingestion, skin absorption, or contact.

Front 146

Hazardous Material

Back 146

A substance (either matter — solid, liquid, or gas — or energy) that when released is capable of creating harm to people, the environment, and property, including weapons of mass destruction
(WMD) as defined in 18 U.S. Code, Section 2332a, as well as any other criminal use of hazardous materials, such as illicit labs, environmental crimes, or industrial sabotage.

Front 147

Hazardous Material

Back 147

A substance (matter — solid, liquid, or gas — or energy) that when released is capable of creating harm to people, the environment, and property, including weapons of mass destruction (WMD) as defined in 18 U.S. Code, Section 2332a, as well as any other criminal use of
hazardous materials, such as illicit laboratories, environmental crimes, or industrial sabotage. Hazardous materials/WMD shall be used throughout this document to represent hazardous materials/weapons of mass destruction.

Front 148

Hazardous Material

Back 148

A substance or material that has been determined to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated.

Front 149

Hazardous Material

Back 149

A substance (solid, liquid, or gas) that when released is capable of creating harm to people, the environment, and property.
[472, 2002]

Front 150

Hazardous Material

Back 150

A substance (solid, liquid, or gas) that when released is capable of creating harm to people, the environment, and property. [472:3.3]

Front 151

Hazardous Material

Back 151

A substance that presents an unusual danger to persons due to properties of toxicity, chemical reactivity, or decomposition, corrosivity, explosion or detonation, etiological hazards, or similar properties.

Front 152

Hazardous Material

Back 152

A substance that presents an unusual danger to persons due to toxicity, chemical reactivity, or decomposition, corrosiveness, explosion or detonation, etiological hazards, or similar properties.

Front 153

Hazardous Material

Back 153

A substance that when released is capable of creating harm to people, the environment, and property. [472:3.3]

Front 154

Hazardous Material
(Chemical)

Back 154

A substance that, by reason of being explosive, flammable, poisonous, corrosive, oxidizing, irritating, or otherwise harmful, is likely to cause death or injury.

Front 155

Hazardous Material or
Hazardous Chemical

Back 155

Material presenting dangers beyond the fire problems relating to flash point and boiling point.

Front 156

Hazardous Material Response
Fire Apparatus

Back 156

An emergency vehicle designed to carry various support equipment and personnel to a scene of a hazardous material incident.

Front 157

Hazardous Materials

Back 157

Any solid, liquid, gas, or mixture thereof that can potentially cause harm to the human body through respiration, ingestion, skin absorption, or contact.

Front 158

Hazardous Materials

Back 158

A substance (either matter — solid, liquid, or gas — or energy) that when released is capable of creating harm to people, the environment, and property, including weapons of mass destruction (WMD) as defined in 18 U.S. Code, Section 2332a, and as well as any other criminal use of hazardous materials, such as illicit labs, environmental crimes, or industrial sabotage. [472, 2008] (See Annex G.)

Front 159

Hazardous Materials

Back 159

A substance (solid, liquid, or gas) that when released is capable of creating harm to people, the environment, and property.

Front 160

Hazardous Materials

Back 160

Substances (solid, liquid, or gas) that when released are capable of creating harm to people, the environment, and property.

Front 161

Hazardous Materials
Branch/Group

Back 161

The function within an overall incident management system that deals with the mitigation and control of the hazardous materials/weapons of mass destruction (WMD) portion of an incident.

Front 162

Hazardous Materials
Emergencies

Back 162

Incidents involving the release or potential release of hazardous chemicals into the environment that can cause loss of life, personnel injury, or damage to property and the environment. [1971, 2007]

Front 163

Hazardous Materials
Emergencies

Back 163

Incidents involving the release or potential release of hazardous materials.

Front 164

Hazardous Materials
Emergencies

Back 164

Incidents involving the release or potential release of hazardous materials into the environment that can cause loss of life, personnel injury, or damage to property and the environment. [1971, 2007]

Front 165

Hazardous Materials Incident

Back 165

An incident involving hazardous or volatile chemicals or other materials that, pursuant to local, state, or federal law, requires prescribed actions for clean-up, disposal, or both.

Front 166

Hazardous Materials Officer

Back 166

(NIMS: Hazardous Materials Branch Director/Group Supervisor.) The person who is responsible for directing and coordinating all operations involving hazardous materials/weapons of mass destruction (WMD) as assigned by the incident commander.

Front 167

Hazardous Materials
Operations

Back 167

All activities performed at the scene of a hazardous materials incident that expose fire department members to the dangers of hazardous materials.

Front 168

Hazardous Materials Response
Team (HMRT)

Back 168

An organized group of trained response personnel operating under an emergency response plan and applicable standard operating procedures who perform hazardous material technician level skills at hazardous materials/weapons of mass destruction (WMD) incidents.

Front 169

Hazardous Materials Safety
Officer

Back 169

(NIMS: Assistant Safety Officer — Hazardous Material.) The person who works within an incident management system (IMS) (specifically, the hazardous materials branch/group) to ensure that recognized hazardous materials/WMD safe practices are followed at hazardous materials/weapons of mass destruction (WMD) incidents.

Front 170

Hazardous Materials Storage
Locker

Back 170

A movable prefabricated structure, manufactured primarily at a site other than the final location of the structure and transported completely assembled or in a ready-to-assemble package to the final location, and intended to meet local, state, and federal requirements for outside storage of hazardous materials.

Front 171

Hazardous Materials Storage
Locker

Back 171

A movable prefabricated structure, manufactured primarily at a site other than the final location of the structure and transported completely assembled or in a ready-to-assemble package to the final location, and intended to meet local, state, and federal requirements for outside
storage of hazardous materials. [30, 2008]

Front 172

Hazardous Materials
Technician

Back 172

Person who responds to hazardous materials/weapons of mass destruction (WMD) incidents using a risk-based response process by which they analyze a problem involving hazardous materials/weapons of mass destruction (WMD), select applicable decontamination procedures, and control a release using specialized protective clothing and control equipment.

Front 173

Hazardous Materials Technician with a Cargo Tank Specialty

Back 173

Person who provides technical support pertaining to cargo tanks,
provides oversight for product removal and movement of damaged cargo
tanks, and acts as a liaison between the hazardous materials technician
and other outside resources.

Front 174

Hazardous Materials Technician with a Marine Tank Vessel Specialty

Back 174

Person who provides technical support pertaining to marine tank vessels, provides oversight for product removal and movement of damaged marine tank vessels, and acts as a liaison between the hazardous materials technician and other outside resources.

Front 175

Hazardous Materials Technician with an Intermodal Tank Specialty

Back 175

Person who provides technical support pertaining to intermodal tanks, provides oversight for product removal and movement of damaged intermodal tanks, and acts as a liaison between the hazardous materials technician and other outside resources.

Front 176

Hazardous Materials Technician with a Tank Car Specialty

Back 176

Person who provides technical support pertaining to tank cars, provides oversight for product removal and movement of damaged tank cars, and acts as a liaison between the hazardous materials technician and other outside resources.

Front 177

Hazardous Material Storage
Facility

Back 177

A building, a portion of a building, or exterior area used for the storage of hazardous materials in excess of exempt amounts.

Front 178

Hazardous Production Material
(HPM)

Back 178

A solid, liquid, or gas associated with semiconductor manufacturing that has a degree-of-hazard rating of 3 or 4 in health, flammability, instability, or water reactivity in accordance with NFPA 704 and that is used directly in research, laboratory, or production processes that have as their end product materials that are not hazardous.

Front 179

Hazardous Production
Material (HPM)

Back 179

A solid, liquid, or gas associated with semiconductor manufacturing that has a degree-of-hazard rating of 3 or 4 in health, flammability, instability, or water reactivity in accordance with NFPA 704 and that is used directly in research, laboratory, or production processes that have as their end product materials that are not hazardous. [5000,
2009]

Front 180

Hazardous Production
Material (HPM) Room

Back 180

A room used in conjunction with or serving a semiconductor fabrication facility where HPM is stored or used and that is classified as Protection Level 2, Protection Level 3, or Protection Level 4.

Front 181

Hazardous Reaction or Hazardous Chemical Reaction

Back 181

Reactions that result in dangers beyond the fire problems relating to flash point and boiling point of either the reactants or of the products.

Front 182

Hazardous Reaction or Hazardous Chemical Reaction

Back 182

Reactions that result in dangers beyond the fire problems relating to flash point and boiling point of either the reactants or of the products. [30, 2008]

Front 183

Hazardous Situation

Back 183

An act or condition that is judged to present a danger to persons or property that is so urgent and severe that it requires immediate corrective or preventive action.

Front 184

Hazardous Substance

Back 184

A substance, including combustible and flammable liquids and flammable gases, that is capable of creating harm to people, the environment, or property due to the dangers that can arise from but are not limited to toxicity, reactivity, ignitibility, or corrosivity.

Front 185

Hazardous Substance

Back 185

For the purpose of handling releases of flammable and combustible liquids and gases, a substance that is capable of creating harm to people, the environment, or property due to the dangers that can arise from but are not limited to toxicity, reactivity, ignitability, or corrosivity.

Front 186

Hazardous Waste

Back 186

Waste that is potentially damaging to the environment or human health due to its toxicity, ignitability, corrosivity, or chemical reactivity or another cause.

Front 187

Hazard Rating

Back 187

The numerical rating of the health, flammability, and self-reactivity, and other hazards of the material, including its reaction with water, specified in NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response.

Front 188

Hazard Rating

Back 188

The numerical rating of the health, flammability, and self-reactivity, and other hazards of the material, including its reaction with water, specified in NFPA 704, Standard System for the Identification of the Hazards of Materials for Emergency Response.
[55, 2005]

Front 189

Haze

Back 189

Light that is scattered as a result of passing through a transparent object.

Front 190

HBV

Back 190

Hepatitis B virus.

Front 191

HCV

Back 191

Hepatitis C Virus.

Front 192

Head

Back 192

A liquidtight transverse closure at the end of a cargo tank.

Front 193

Head

Back 193

A quantity used to express a form (or combination of forms) of the energy content of water per unit weight of the water referred to any arbitrary datum.

Front 194

Headband

Back 194

The portion of the helmet suspension that encircles the head.

Front 195

Header

Back 195

A pipe or duct through which liquid or gas is conveyed and supplied to or received from multiple branches.

Front 196

Header

Back 196

Transverse metal raceways for electrical conductors, providing access to predetermined cells of a precast cellular concrete floor, thereby permitting the installation of electrical conductors from a distribution center to the floor cells.

Front 197

Header

Back 197

Where referring to chimneys, a beam set at right angles to floor or roof joists to provide support and framing around the opening.

Front 198

Headform

Back 198

A device that simulates the configuration of the human head.

Front 199

Heads-Up Display (HUD)

Back 199

Visual display of information and system condition status visible to the wearer.

Front 200

Headway

Back 200

The interval of time between the arrivals of consecutive trains at a platform in a station.

Front 201

Health and Fitness
Coordinator

Back 201

A person who, under the supervision of the fire department physician, has been designated by the department to coordinate and be responsible for the health and fitness programs of the department.

Front 202

Health and Fitness
Coordinator

Back 202

The person who, under the supervision of the fire department physician, has been designated by the department to coordinate and be responsible for the health and fitness programs of the department.

Front 203

Health and Fitness
Coordinator

Back 203

The person who, under the supervision of the fire department physician, has been designated by the department to coordinate and be responsible for the health and fitness programs of the department. [1500, 2007]

Front 204

Health and Safety Committee

Back 204

A representative group of individuals who serve along with the fire department physician and health and fitness coordinator, and is chaired by the fire department health and safety officer, who oversee the implementation of the fire department occupational safety and health program.

Front 205

Health and Safety
Management System

Back 205

A management system that integrates and directs the risk management process to enable an organization to control and/or reduce the frequency and severity of the risks associated with fire department emergency and nonemergency operations in order to realize the fire department’s health and safety goals. Health and safety programs are elements of a health and safety management system.

Front 206

Health and Safety Officer

Back 206

The member of the fire department assigned and authorized by the fire chief as the manager of the safety and health program.

Front 207

Health and Safety Officer

Back 207

The member of the fire department assigned and authorized by the fire chief as the manager of the safety and health program.
[1500, 2002]

Front 208

Health and Safety Officer

Back 208

The member of the fire department assigned and authorized by the fire chief as the manager of the safety and health program.
[1500, 2007]

Front 209

Health and Safety Officer
(HSO)

Back 209

The member of the fire department assigned and authorized by the fire chief as the manager of the safety and health program.
[1500, 2007]

Front 210

Health Care Facilities

Back 210

Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care are provided. Health care facilities include, but are not limited to, hospitals, nursing homes, limited care facilities, clinics, medical and dental offices, and ambulatory care centers. [99:3.3]

Front 211

Health Care Facilities

Back 211

Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care are provided. Health care facilities include, but are not limited to, hospitals, nursing homes, limited care facilities, clinics, medical and dental offices, and ambulatory care centers, whether permanent or movable.

Front 212

Health Care Facilities

Back 212

Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care is provided. (ADM)

Front 213

Health Care Facilities

Back 213

Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care is provided. Health care facilities include, but are not limited to, hospitals, nursing homes, limited care facilities, clinics, medical and dental offices, and ambulatory care centers.

Front 214

Health Care Facilities

Back 214

Buildings or portions of buildings in which medical, dental, psychiatric, nursing, obstetrical, or surgical care is provided. Health care facilities include, but are not limited to, hospitals, nursing homes, limited care facilities, clinics, medical and dental offices, and ambulatory care centers. [5000, 2006]

Front 215

Health Care Financing
Administration (HCFA)

Back 215

The former name of the Center for Medicare and Medicaid Services
(CMS).

Front 216

Health Care Occupancy

Back 216

An occupancy used for purposes of medical or other treatment or care of four or more persons where such occupants are mostly incapable of
self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control. [101, 2006]

Front 217

Health Care Occupancy

Back 217

An occupancy used for purposes of medical or other treatment or care of four or more persons where such occupants are mostly incapable of
self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control. [5000, 2009]

Front 218

Health Care Occupancy

Back 218

An occupancy used for purposes of medical or other treatment or care of four or more persons where such occupants are mostly incapable of
self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control. [5000:3.3]

Front 219

Health Care Occupancy

Back 219

An occupancy used for purposes of medical or other treatment or care of four or more persons where such occupants are mostly incapable of
self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control. [101:3.3]

Front 220

Health Care Occupancy

Back 220

An occupancy used to provide medical or other treatment or care simultaneously to four or more patients on an inpatient basis, where such patients are mostly incapable of self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control.

Front 221

Health Care Occupancy

Back 221

An occupancy used to provide medical or other treatment or care simultaneously to four or more patients on an inpatient basis, where such patients are mostly incapable of self-preservation due to age, physical or mental disability, or because of security measures not under the occupants’ control. [5000, 2009]

Front 222

Health Data Base

Back 222

A compilation of records and data that relates to the health experience of a group of individuals and is maintained in a manner such that it is retrievable for study and analysis over a period of time.

Front 223

Health Data Base

Back 223

A compilation of records and data that relates to the health experience of a group of individuals and is maintained in a manner such that it is retrievable for study and analysis over a period of time. [1500, 2002]

Front 224

Health Hazard

Back 224

Any property of a material that either directly or indirectly can cause injury, illness, or incapacitation, either temporary or permanent, from exposure by contact, inhalation, or ingestion.

Front 225

Health Hazard Material

Back 225

A chemical or substance classified as a toxic, highly toxic, or corrosive material in accordance with definitions set forth in this Code.

Front 226

Health Hazard Material

Back 226

A chemical or substance classified as a toxic, highly toxic, or corrosive material in accordance with the definitions set forth in NFPA 1, Uniform Fire Code.

Front 227

Health Hazard Material

Back 227

A chemical or substance classified as a toxic, highly toxic, or corrosive material in accordance with the definitions set forth in this Code. [5000,
2009]

Front 228

Health Maintenance
Organization (HMO)

Back 228

An organized system of health care that provides or arranges for a range of basic and supplemental health care services to a voluntarily enrolled group of persons under a prepayment plan.

Front 229

Health Promotion

Back 229

Preventive activities that identify real and potential health risks in the work environment and that inform, motivate, and otherwise help people to adopt and maintain healthy practices and lifestyles.

Front 230

Health-Related Fitness Program
(HRFP)

Back 230

A comprehensive program designed to promote the member’s ability to perform occupational activities and to reduce or eliminate injuries and premature death.

Front 231

Hearth

Back 231

The floor area within the fire chamber of a fireplace or a fireplace stove.

Front 232

Hearth Extension

Back 232

The noncombustible surfacing applied to the floor area extending in front of and at the sides of the hearth opening of a fireplace or a fireplace stove; also where applied to the floor area beneath a fireplace stove or beneath an elevated overhanging fireplace hearth.

Front 233

Heat

Back 233

A form of energy characterized by vibration of molecules and capable of initiating and supporting chemical changes and changes of state.

Front 234

Heat-Actuated Device

Back 234

Devices that include fixed temperature releases, rate-of-temperature-rise releases, and door closers with hold-open arms embodying a fusible link.

Front 235

Heat Alarm

Back 235

A single or multiple station alarm responsive to heat. (SIG-IDS)

Front 236

Heat and Flame Vector

Back 236

An arrow used in a fire scene drawing to show the direction of heat, smoke, or flame flow.

Front 237

Heat Detector

Back 237

A fire detector that detects either abnormally high temperature or rate of temperature rise, or both. [72, 2007]

Front 238

Heat Detector

Back 238

A fire detector that detects either abnormally high temperature or rate of temperature rise, or both. (SIG-IDS)

Front 239

Heat Detector

Back 239

A fire detector that detects either abnormally high temperatures or rate of temperature rise, or both.

Front 240

Heated Vaporizer

Back 240

A vaporizer that derives heat for vaporization from the combustion of fuel, electric power, or waste heat, such as from boilers or internal combustion engines.

Front 241

Heated Vaporizer

Back 241

A vaporizer that derives its heat from the combustion of fuel, electric power, or waste heat, such as from boilers or internal combustion engines.

Front 242

Heat-Energy

Back 242

A term used to indicate that only the thermal forms of energy are of concern.

Front 243

Heat-Energy Source (Source)

Back 243

Any place, material, or object at which heat-energy can originate or from which heat-energy can be transferred.

Front 244

Heat-Energy Transfer Process

Back 244

The exchange of thermal energy from the source to the fuel by the mechanisms of conduction, convection, or radiation, or all three.

Front 245

Heat Exchanger

Back 245

A chamber in which heat resulting directly from the combustion of fuel, or heat from a medium such as air, water, or steam, is transferred through the walls of the chamber to air passing through the exchanger; or a chamber in which heat from electric resistors is transferred to the air.

Front 246

Heat Exchanger

Back 246

Equipment that transfers heat from one vapor or liquid to another vapor or liquid.

Front 247

Heat Flux

Back 247

For the purposes of this standard, the rate of heat transferred per unit area to surface, typically expressed in kilowatts/m2, kilojoules/sec-m2 or Btu/sec-ft2.

Front 248

Heat Flux

Back 248

The measure of the rate of heat transfer to a surface, expressed in kilowatts/m2, kilojoules/m2 · sec, or Btu/ft2 · sec.

Front 249

Heat Flux Meter

Back 249

An instrument used to measure the level of heat flux energy incident on a surface.

Front 250

Heating and Cooking
Appliance

Back 250

An oil-fired appliance not intended for central heating.

Front 251

Heating Appliance

Back 251

An appliance for comfort heating of a recreational vehicle or for water heating.

Front 252

Heating Equipment

Back 252

As used in this article, any equipment that is used for heating purposes and whose heat is generated by induction or dielectric methods.

Front 253

Heating Equipment Applicator

Back 253

The device used to transfer energy between the output circuit and the object or mass to be heated.

Front 254

Heating Flux

Back 254

The incident radiant heat flux imposed externally from the heater on the specimen at the initiation of the test.

Front 255

Heating Flux

Back 255

The incident radiant heat flux imposed externally from the heater on the specimen at the initiation of the test. [271, 2004]

Front 256

Heating Panel

Back 256

A complete assembly provided with a junction box or a length of flexible conduit for connection to a branch circuit.

Front 257

Heating Panel Set

Back 257

A rigid or nonrigid assembly provided with nonheating leads or a terminal junction assembly identified as being suitable for connection to a wiring system.

Front 258

Heating System

Back 258

A complete system consisting of components such as heating elements, fastening devices, nonheating circuit wiring, leads, temperature controllers, safety signs, junction boxes, raceways, and fittings.

Front 259

Heating Value (Total)

Back 259

The number of British thermal units produced by the combustion, at constant pressure, of 1 ft3 (0.03 m3) of gas when the products of combustion are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all the necessary corrections have been applied.

Front 260

Heat of Ignition

Back 260

The heat energy that brings about ignition.

Front 261

Heat of Ignition

Back 261

The heat energy that brings about ignition. Heat energy comes in various forms and usually from a specific object or source. Therefore, the heat of ignition is divided into two parts: (a) equipment involved in ignition and (b) heat source. (See Sections
8.4 and 8.5.)

Front 262

Heat-Producing Appliance

Back 262

An appliance that produces heat by utilizing electric energy or by burning fuel.

Front 263

Heat-Producing Appliance

Back 263

An appliance that produces heat by utilizing electric energy or by burning fuel. [211, 2003]

Front 264

Heat Pump

Back 264

A refrigeration system arranged to accomplish either heating or heating and cooling.

Front 265

Heat Reclaimer, Chimney
Connector-Type

Back 265

A heat exchanger intended to be installed in a chimney connector between a heating appliance and the chimney to transfer heat from the flue gases through metal to air or water. [211, 2006]

Front 266

Heat Recovery Steam
Generator (HRSG)

Back 266

A heat exchanger that uses a series of heat transfer sections (e.g., superheater, evaporator, and economizer) positioned in the exhaust gas flow of a combustion turbine to recover heat and supply a rated steam flow at a required temperature and pressure.

Front 267

Heat Release Rate

Back 267

The heat evolved from the specimen, per unit of time.

Front 268

Heat Release Rate

Back 268

The heat evolved from the specimen, per unit of time. [271, 2004]

Front 269

Heat Release Rate (HRR)

Back 269

The rate at which heat energy is generated by burning.

Front 270

Heat Release Rate (HRR)

Back 270

The rate at which heat energy is generated by burning. [921, 2008]

Front 271

Heat Release Rate (HRR)

Back 271

The rate at which heat energy is generated by burning. [921, 2004]

Front 272

Heat Resistance

Back 272

The property of a foam to withstand exposure to high heat fluxes without loss of stability.

Front 273

Heat-Sensitive Material

Back 273

A material whose melting point is below 1700°F (926.7°C).

Front 274

Heat-Sensitive Material

Back 274

A material whose melting point is below 1700°F (926.7°C). [13, 2002]

Front 275

Heat Sensor Label

Back 275

A label that changes color at a preset temperature to indicate a specific heat exposure.

Front 276

Heat Sensor Label

Back 276

A label that changes color at a preset temperature to indicate a specific heat exposure. [1931:3.3]

Front 277

Heat Transfer Fluid (HTF)

Back 277

A liquid that is used as a medium to transfer heat energy from a heater or vaporizer to a remote heat consumer (e.g., injection molding machine, oven, or dryer, or jacketed chemical reactor).

Front 278

Heat Transfer Fluid (HTF)

Back 278

A liquid that is used as a medium to transfer heat energy from a heater or vaporizer to a remote heat consumer (e.g., injection molding machine, oven, or dryer, or jacketed chemical reactor). [30,
2008]

Front 279

Heat Treatment

Back 279

A sludge-conditioning process combining high temperature, time, and pressure to improve the dewaterability of organic sludge.

Front 280

Heavy Casting

Back 280

Castings greater than 11.3 kg (25 lb) with walls of large cross-sectional dimensions [at least 6.4 mm (1⁄4 in.)].

Front 281

Heavy Construction Type

Back 281

Construction that utilizes masonry, steel, and concrete in various combinations, including tilt-up, steel frame with infill, concrete moment resisting frame, concrete shearwall, unreinforced masonry infill in concrete frame, and precast concrete. (See Annex D.)

Front 282

Heavy-Duty Stack

Back 282

A smoke or vent stack with a flue that has a cross-sectional area of the flue greater than 0.3 m2 (500 in.2) and a height greater than 23 m (75 ft).

Front 283

Heavy Equipment

Back 283

Ground vehicles used in the suppression of wildland fires, such as dozers, tractors, plows, and their transport vehicles. Heavy equipment does not include fire apparatus.

Front 284

Heavy Equipment

Back 284

Typically, construction equipment that can include but is not limited to backhoes, trac hoes, grade-alls, and cranes.

Front 285

Heavy Load

Back 285

Any load over 3175.15 kg (7000 lb).

Front 286

Heavy Object

Back 286

An item of such size and weight that it cannot be moved without the use of power tools (e.g., hydraulic lifting devices) or complex mechanical advantage systems.

Front 287

Heavy Structural Collapse

Back 287

Collapse of heavy construction-type buildings that require special tools and training to gain access into the building.

Front 288

Heavy Timber Construction

Back 288

Type IV (2HH) construction as defined in NFPA 5000, Building
Construction and Safety Code.

Front 289

Heavy Vehicle

Back 289

Heavy duty highway, off-road, construction, or mass transit vehicles constructed of materials presenting resistance to common extrication procedures, tactics, and resources and posing multiple concurrent hazards to rescuers from occupancy, cargo, size, construction, weight, or position.

Front 290

Heel

Back 290

The inclination of a ship to one side.

Front 291

Heel Angle

Back 291

The angle defined by the intersection of a vertical line through the center of a vessel and a line perpendicular to the surface of the water.

Front 292

Heel Breast

Back 292

The forward face of the footwear heel.

Front 293

Heeling

Back 293

(1) Tipping to one side. (2) Causing a ship to list.

Front 294

Height

Back 294

As applied to a building, the vertical distance from the adjacent ground elevation to the average elevation of the roof of the highest story.

Front 295

Helicopter Storage and
Servicing Area

Back 295

That part of a rooftop hangar normally used for the storage and servicing of one or more helicopters, not including any adjacent or contiguous areas or structures, such as shops, storage areas, and offices.

Front 296

Helipad Support Structure

Back 296

A structure used for helipad and/or helicopter maintenance or storage that is not classified as a rooftop hangar.

Front 297

Heliport

Back 297

An identifiable area located on land, on water, or on a structure that also includes any existing buildings or facilities thereon, used or intended to be used for landing and takeoff of helicopters.

Front 298

Heliport

Back 298

An identifiable area located on land, on water, or on a structure, that also includes any existing buildings or facilities thereon, used or intended to be used for landing and takeoff of helicopters.
[418, 2006]

Front 299

Helistop

Back 299

A heliport where no refueling, maintenance, repair, or storage of helicopters is permitted.

Front 300

Helm

Back 300

The position from which direction and water speed of the vessel are controlled.

Front 301

Helmet Positioning Index

Back 301

The distance, as specified by the manufacturer, from the lowest point of the brow opening at the lateral midpoint of the helmet to the basic plane of the headform when the helmet is firmly positioned on the headform.

Front 302

Helmet Shell

Back 302

A helmet without the suspension system, accessories, and fittings.

Front 303

Hermetically Sealed

Back 303

Equipment sealed against the entrance of an external atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.

Front 304

Barmetic Refrigerant
Motor-Compressor

Back 304

A combination consisting of a compressor and motor, both of which are enclosed in the same housing, with no external shaft or shaft seals, the motor operating in the refrigerant.

Front 305

High Angle

Back 305

Refers to an environment in which the load is predominantly supported by the rope rescue system.

Front 306

High Angle

Back 306

Refers to an environment in which the load is predominantly supported by the rope rescue system. [1670, 2004]

Front 307

High-Challenge Fire Hazard

Back 307

A fire hazard typical of that produced by fires in combustible high-piled storage.

Front 308

High Challenge Fire Wall

Back 308

A wall used to separate buildings or subdivide a building with high fire challenge occupancies, having enhanced fire resistance ratings and enhanced appurtenance protection to prevent the spread of fire, and having structural stability.

Front 309

High Challenge Fire Wall

Back 309

A wall used to separate buildings or subdivide a building with high fire challenge occupancies, having enhanced fire resistance ratings and enhanced appurtenance protection to prevent the spread of fire, and having structural stability. [221, 2009].

Front 310

High-Energy Foam System

Back 310

A device or system that adds the energy of a pressurized air source to the energy of a pressurized water source to create foam.

Front 311

Highest Pulling Force (HPF)

Back 311

The pulling force that is achieved by the powered rescue tool while operating at the rated system input at the position of the arms or piston where the tool generates its greatest amount of force.

Front 312

Highest Spreading Force
(HSF)

Back 312

The spreading force that is achieved by the powered rescue tool while operating at the rated system input at the position of the arms or piston where the tool generates its greatest amount of force.

Front 313

High-Expansion Foam

Back 313

Foams with expansion ratios ranging from 200:1 to approximately
1000:1.

Front 314

High Explosive

Back 314

A material that is capable of sustaining a reaction front that moves through the unreacted material at a speed equal to or greater than that
of sound in that medium [typically 1000 m/sec (3000 ft/sec)]; a material capable of sustaining a detonation. (See also 3.3.40, Detonation.)

Front 315

High Explosive Material

Back 315

Explosive materials that are characterized by a very high rate of reaction, high pressure development, and the presence of a detonation wave.

Front 316

High Explosive (Material)

Back 316

Explosive material, such as dynamite, that can be caused to detonate by means of a No. 8 test blasting cap when unconfined.

Front 317

High Fire Point Liquid

Back 317

A combustible dielectric liquid listed as having a fire point of not less than 572°F (300°C).

Front 318

High Fire Point Liquid

Back 318

A combustible dielectric liquid listed as having a fire point of not less than 572°F (300°C). [850, 2005]

Front 319

High Fuel Pressure Switch

Back 319

A pressure-activated switch arranged to effect a safety shutdown of the burner system in the event of abnormally high fuel pressure.

Front 320

High Hazard

Back 320

Contents that are likely to burn with extreme rapidity or from which explosions are likely.

Front 321

High Hazard

Back 321

High hazard contents include materials defined as hazardous materials in
3.3.161.3, whether stored, used, or handled. [5000:6.3.2.4.1.1]

Front 322

High Hazard Contents

Back 322

High hazard contents include materials defined as hazardous materials in NFPA 1, whether stored, used or handled. [1, 2006]

Front 323

High Hazard Contents, Level 2

Back 323

High hazard Level 2 contents include materials that present a deflagration hazard or a hazard from accelerated burning including, but not limited to, the following: (1) Class I, Class II, or Class III-A flammable or combustible liquids that are used or stored in normally open containers or systems, or in closed containers or systems at gauge pressures of more than 15 psi (103.3 kPa) (2) Combustible dusts stored, used, or generated in a manner creating a severe fire or explosion hazard (3) Flammable gases and flammable cryogenic liquids (4) Class I organic peroxides (5) Class 3 solid or liquid oxidizers that are used or stored in normally open containers or systems, or in closed containers or systems at gauge pressures of more than 15 psi (103.3 kPa) (6) Nondetonable pyrophoric materials (7) Class 3 nondetonable unstable (reactive) materials (8) Class 3
water-reactive materials [1, 2006]

Front 324

High Hazard Contents, Level 3

Back 324

High hazard Level 3 contents include materials that readily support combustion or present a physical hazard including, but not limited to, the following: (1) Level 2 and Level 3 aerosols (2) Class I, Class II, or Class III-A flammable or combustible liquids that are used or stored in normally closed containers or systems at gauge pressures of less than
15 psi (103.4 kPa) (3) Classification 1.4G consumer fireworks (4) Flammable solids, other than dusts classified as high hazard Level 2, stored, used, or generated in a manner creating a high fire hazard (5) Class II and Class III organic peroxides (6) Class 2 solid or liquid oxidizers (7) Class 3 solid or liquid oxidizers that are used or stored in normally closed containers or systems at gauge pressures of less than
15 psi (103.4 kPa) (8) Oxidizing gases and oxidizing cryogenic liquids (9) Class 2 unstable (reactive) materials (10) Class 2 water-reactive materials [1, 2006]

Front 325

High Hazard Contents, Level 4

Back 325

High hazard Level 4 contents include materials that are acute health hazards including, but not limited to, the following: (1) Corrosives (2) Highly toxic materials (3) Toxic materials [1, 2006]

Front 326

High Hazard Industrial
Occupancy

Back 326

An industrial occupancy in which industrial operations that include high hazard materials, processes, or contents are conducted.

Front 327

High Hazard Level 1 Contents

Back 327

High hazard Level 1 contents include materials that present a detonation hazard, but not limited to, explosives; unclassified detonable organic peroxides; Class 4 oxidizers; detonable pyrophoric materials ; and unstable (reactive) materials, Class 3 detonable, and Class 4. [5000:6.3.2.4.2]

Front 328

High Hazard Level 2 Contents

Back 328

Contents that present a deflagration hazard or a hazard from accelerated burning. For the purposes of this code, this includes Class I, Class II, or Class IIIA liquids that are used or stored in normally open containers or systems, or in closed containers or systems at
gauge pressures 15 psi (103 kPa) or greater.

Front 329

High Hazard Level 2 Contents

Back 329

High hazard Level 2 contents include materials that present a deflagration hazard or a hazard from accelerated burning, including but not limited to: Class I, Class II or Class III-A flammable or combustible liquids that are used or stored in normally open containers or systems, or in closed containers or systems at gauge pressures of more than 15 psi (103 kPa); combustible dusts stored, used, or generated in a manner creating a severe fire or explosion hazard; flammable gases and flammable cryogenic liquids; Class I organic peroxides; Class 3 solid or liquid oxidizers that are used or stored in normally open containers or systems, or in closed containers or systems at gauge pressures of more than 15 psi (103 kPa); nondetonable pyrophoric materials; Class 3 nondetonable unstable (reactive) materials; and Class 3 water-reactive materials. [5000:6.3.2.4.3]

Front 330

High Hazard Level 3 Contents

Back 330

Contents that readily support combustion or that present a physical hazard. For the purposes of this code, this includes Class I, Class II, or Class IIIA liquids that are used or stored in normally closed containers or in closed systems at gauge pressures of less than 15 psi (103 kPa).

Front 331

High Hazard Level 3 Contents

Back 331

High hazard Level 3 contents include materials that readily support combustion or present a physical hazard including, but not limited to, Level 2 and Level 3 aerosols; Class I, Class II, or Class III-A flammable or combustible liquids that are used or stored in normally closed containers or systems at gauge pressures of less than 15 psi (103 kPa); consumer fireworks, 1.4 G; flammable solids, other than dusts classified as high hazard Level 2, stored, used, or generated in a manner creating a high fire hazard; Class II and Class III organic peroxides; Class 2 solid or liquid oxidizers; Class 3 solid or liquid oxidizers that are used or stored in normally closed containers or systems at gauge pressures of less than 15 psi (103 kPa); oxidizing gases and oxidizing cryogenic liquids; Class 2 unstable (reactive) materials; and Class 2 water-reactive materials. [5000:6.3.2.4.4]

Front 332

High Hazard Level 4 Contents

Back 332

High hazard Level 4 contents include materials that are acute health hazards including, but not limited to, corrosives; highly toxic materials; and toxic materials [5000:6.3.2.4.5]

Front 333

High Hazard Level 5 Contents

Back 333

High hazard Level 5 contents include hazardous production materials (HPM) used in the fabrication of semiconductors or semiconductor research and development. [5000:6.3.2.4.6]

Front 334

High Hazard Materials

Back 334

Materials that are combustible or flammable liquids, flammable gases, and combustible dusts.

Front 335

High Hazard Occupancy

Back 335

Areas that have high hazard buildings, materials, processes, or contents.

Front 336

High-Idle Speed Control

Back 336

A control or switch system that provides a means to increase the engine operating speed from an idle condition to a higher preset operating speed.

Front 337

High Impedance Faults

Back 337

Fire-induced faults on circuits routed through a common fire area that are assumed to occur simultaneously and have a current magnitude below the trip point for the individual circuits and the sum of the currents generated by the simultaneous occurrence of such faults could trip the main circuit breaker and cause the loss of a safe shutdown power supply.

Front 338

High Limit Control Device

Back 338

An operating device installed and serving as an integral component of a deep fat fryer that provides secondary limitation of the grease temperature by automatically disconnecting the thermal energy input when the temperature limit is exceeded.

Front 339

Highline System

Back 339

A system of using rope or cable suspended between two points for movement of persons or equipment over an area that is a barrier to the rescue operation, including systems capable of movement between points of equal or unequal height.

Front 340

High-Low Pressure Interface

Back 340

A valve or set of valves that separates a high-pressure primary coolant system from a low-pressure system.

Front 341

Highly Toxic Gas

Back 341

A chemical that has a median lethal concentration (LC50) in air of 200 ppm by volume or less of gas or vapor, or 2 mg/L or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 0.44 lb and
0.66 lb (200 g and 300 g) each. [55, 2005]

Front 342

Highly Toxic Gas

Back 342

A chemical that has a median lethal concentration (LC50) in air of 200 ppm by volume or less of gas or vapor, or 2 mg/L or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighing between 200 g and
300 g (0.44 lb and 0.66 lb) each.

Front 343

Highly Toxic Material

Back 343

A material that produces a lethal dose or lethal concentration that falls within any of following categories: (1) a chemical that has a median lethal dose (LD50) of 50 mg/kg or less of body weight when administered orally to albino rats weighing between 200 g and 300 g each; (2) a chemical that has a median lethal dose (LD50) of 200 mg/kg or less of body weight when administered by continuous contact for 24 hours, or less if death occurs within 24 hours, with the bare skin of albino rabbits weighing between 2 kg and 3 kg each or albino rats weighing 200 g to 300 g each; (3) a chemical that has a median lethal concentration (LC50) in air of 200 parts per million by volume or less of gas or vapor, or 2 mg/L or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour, or less if death occurs within 1 hour, to albino rats weighing between 200 g and 300 g each. [5000, 2009]

Front 344

Highly Toxic Material

Back 344

A material that produces a lethal dose or lethal concentration that falls within any of the following categories: (1) a chemical that has a median lethal dose (LD50) of 50 mg/kg or less of body weight when administered orally to albino rats weighing between 200 g and 300 g each; (2) a chemical that has a median lethal dose (LD50) of 200 mg/kg or less of body weight when administered by continuous contact for 24 hours, or less if death occurs within 24 hours, with the bare skin of albino rabbits weighing between 2 kg and 3 kg each or albino rats weighing 200 g to 300 g each; (3) a chemical that has a median lethal concentration (LC50) in air of 200 parts per million by volume or less of gas or vapor, or 2 mg/L or less of mist, fume, or dust, when administered by continuous inhalation for 1 hour, or less if death occurs within 1 hour, to albino rats weighing between 200 g and 300 g each.

Front 345

Highly Volatile Liquid

Back 345

A liquid with a boiling point of less than 68°F (20°C).

Front 346

High-Order Damage

Back 346

A rapid pressure rise or high-force explosion characterized by a shattering effect on the confining structure or container and long missile distances.

Front 347

High-Piled Storage

Back 347

Solid-piled, palletized, rack storage, bin box, and shelf storage in excess of 12 ft (3.7 m) in height. [13, 2007]

Front 348

High-Piled Storage

Back 348

Solid-piled, palletized, rack storage, bin box, and shelf storage in excess of 12 ft (3.7 m) in height.

Front 349

High-Point Anchor

Back 349

A point above an obstacle to be negotiated used for attachment of rescue systems.

Front 350

High Power Rocket

Back 350

A rocket vehicle that (1) is propelled by one or more high power rocket motors; or (2) is propelled by a combination of model rocket motors having an installed total impulse of more than 320 N-sec (71.9 lb-sec); or (3) is propelled by a combination of model rocket motors having more than a total of 125 g (4.4 oz) of propellant weight; or (4) weighs more than 1500 g (53 oz) with motor(s) installed.

Front 351

High Power Rocket

Back 351

A rocket vehicle that (1) is propelled by one or more high power rocket motors; or (2) is propelled by a combination of model rocket motors having an installed total impulse of more than 320 N-sec (71.9 lb-sec); or (3) is propelled by a combination of model rocket motors having more than a total of 125 g (4.4 oz) of propellant weight; or (4) weighs more than 1500 g (53 oz) with motor(s) installed. [1127, 2008]

Front 352

High Power Rocket Motor

Back 352

A rocket motor that has more than 160 N-sec (36 lb-sec) but no more than 40,960 N-sec (9208 lb-sec) of total impulse, or that produces an average thrust of greater than 80 N (18 lbf), or that contains greater than 62.5 g (2.2 oz) of propellant. [1125, 2007]

Front 353

High Power Rocket Motor

Back 353

A rocket motor that has more than 160 N-sec but no more than
40,960 N-sec of total impulse, or that produces an average thrust of
greater than 80 N, or that contains greater than 62.5 g (2.2 oz) of
propellant.

Front 354

High Pressure

Back 354

A pressure exceeding 200 psig (1.38 kPa gauge) (215 psia). (GAS)

Front 355

High Pressure

Back 355

Indicates that the carbon dioxide is stored in pressure containers at ambient temperatures.

Front 356

High Pressure Acetylene

Back 356

Acetylene at pressures exceeding a gauge pressure of 15 psi (103 kPa), but not exceeding a gauge pressure of 400 psi (2760 kPa).

Front 357

High-Pressure Boiler

Back 357

A boiler for generating steam at gauge pressures in excess of 15 psi (103 kPa), or for heating water to a temperature in excess of 250°F (121°C) or at a gauge pressure in excess of 160 psi (1103 kPa).

Front 358

High Pressure Boiler

Back 358

A boiler for generating steam at gauge pressures in excess of 15 psi (gauge pressure of 103 kPa), or for heating water to a temperature in excess of 250°F (121°C) or at a gauge pressure in excess of 160 psi (gauge pressure of 1100 kPa).

Front 359

High-Pressure Cylinder

Back 359

Cylinders (and cartridges) containing nitrogen, compressed air, carbon dioxide, or other gases at a pressure higher than 500 psi
(3447 kPa) at 70°F (21°C).

Front 360

High Pressure Fuel Gas System

Back 360

A fuel gas system using the kinetic energy of a jet of 1 psig (7 kPa) or higher gas pressure to entrain from the atmosphere all, or nearly all, the air required for combustion.

Front 361

High Pressure Gas Quenching

Back 361

Gas-cooling at pressures greater than 15 psig.

Front 362

High-Pressure Oxygen
Manifold

Back 362

A manifold connecting oxygen containers having a DOT service gauge pressure exceeding 1.7 MPa (250 psi).

Front 363

High-Pressure Regulator

Back 363

A pressure regulator for LP-Gas liquid or vapor service designed to reduce pressure from the container to a lower pressure in excess of 1.0 psig (6.9 kPag).

Front 364

High Pressure System

Back 364

A water mist system where the distribution system piping is exposed to pressures of 34.5 bar (500 psi) or greater.

Front 365

High-Rise Building

Back 365

A building greater than 23 m (75 ft) in height where the building height is measured from the lowest level of fire department vehicle access to the floor of the highest occupiable story. [5000, 2006]

Front 366

High-Rise Building

Back 366

A building where the floor of an occupiable story is greater than 75 ft (23 m) above the lowest level of fire department vehicle access.

Front 367

High-Rise Building

Back 367

A building where the floor of an occupiable story is greater than 75 ft (23 m) above the lowest level of fire department vehicle access.
[5000, 2006]

Front 368

High-Rise Building

Back 368

A building where the floor of an occupiable story is greater than 75 ft (23 m) above the lowest level of fire department vehicle access.
[5000, 2009]

Front 369

High-Risk Fuel

Back 369

Class-IA, -IB, -IC, or -II liquids or Class-IIIA or -IIIB liquids heated to within 10°C (50°F) of their flash point, or pressurized to 174.4 kPa (25.3 psi) or more.

Front 370

High-Speed Vessels

Back 370

A craft capable of a maximum speed, in meters per second (knots) equal to or exceeding the following: (1) m/sec ≥ 3.7 × displacement(.1667) [knots ≥ 7.4 × displacement(.1667)],
(2) displacement in m3 or long tons.

Front 371

High-Static Pressure-Type Unit
Heater

Back 371

A self-contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 in. (15 mm) H2O or greater static pressure.

Front 372

High Temperature-Protective
Clothing

Back 372

Protective clothing designed to protect the wearer for short-term high temperature exposures.

Front 373

High Vacuum

Back 373

A vacuum with a pressure between 1 × 10-3 torr and 1 × 10-5 torr
(millimeters of mercury).

Front 374

High Velocity Wave Action
(Flood Resistance)

Back 374

Condition present during the base flood where wave heights are greater than or equal to 36 in. (915 mm) or where wave run-up elevations exceed 36 in. (915 mm) above the finished ground level. Areas subject to high velocity wave action are designated on the flood insurance rate map or flood hazard map as Zone V, Zone VE, Zone VO, or Zone V1-30.

Front 375

High Voltage

Back 375

For the purposes of this article, more than 600 volts, nominal.

Front 376

High Voltage Direct Current
(HVDC) Converter Station

Back 376

A facility that functions as an electrical rectifier (ac-dc) or an inventor (dc-ac) to control and transmit power in a high voltage network. There are two types of HVDC valves — the mercury arc valve and the present-day technology solid state thyristor valve. Both types of valves present a fire risk due to high voltage equipment that consists of oil-filled converter transformers, wall bushings, and capacitors in addition to various polymeric components.

Front 377

Highway

Back 377

Any paved facility on which motor vehicles travel.

Front 378

Highway

Back 378

Any public street, public alley, or public road.

Front 379

Highway

Back 379

Any public street, public alley, or public road including a privately financed, constructed, or maintained road that is regularly and openly traveled by the general public.

Front 380

Hinge Dowel

Back 380

A dowel or pin that projects from a door jamb into an opening in the edge of a door at its hinge that prevents removal of the locked door even if the hinges or hinge pins are removed.

Front 381

Hinge Pins

Back 381

Pins that are used at either the swivel or point of articulation of an aerial device.

Front 382

HIPAA

Back 382

Health Insurance Portability and Accountability Act of 1996, a U.S. federal law that regulates all information pertinent to health matters.

Front 383

Historic Building

Back 383

A building or facility deemed to have historical, architectural, or cultural significance by a local, regional, or national jurisdiction.

Front 384

Historic Building

Back 384

For the purpose of this standard, a building that is designated, or deemed eligible for such designation, by a local, regional, or national jurisdiction as having historical, architectural, or cultural significance.

Front 385

Historic Building (Flood
Resistance)

Back 385

A building or structure that is (1) listed or preliminarily determined to be eligible for listing in the National Register of Historic Places, or (2) determined by the secretary of the U.S. Department of Interior as contributing to the historical significance of a registered historic district
or a district preliminarily determined to qualify as an historic district, or (3) designated as historic under a state or local historic preservation program approved by the U.S. Department of Interior.

Front 386

Historic Fabric

Back 386

Original or added building or construction materials, features, and finishes that existed during the period that is deemed to be most architecturally or historically significant, or both.

Front 387

Historic Preservation

Back 387

A generic term that encompasses all aspects of the professional and public concern related to the maintenance of a historic structure, site, or element in its current condition, as originally constructed, or with the additions and alterations determined to have acquired significance over time.

Front 388

Historic Preservation

Back 388

A generic term that encompasses all aspects of the professional and public concern related to the maintenance of a historic structure, site, or element in its current condition, as originally constructed, or with the additions and alterations determined to have acquired
significance over time. [914, 2007]

Front 389

Historic Site

Back 389

A place, often with associated structures, having historic significance.

Front 390

Historic Site

Back 390

A place, often with associated structures, that has historic significance.

Front 391

Historic Structure

Back 391

A building, bridge, lighthouse, monument, pier, vessel, or other construction that is designated or that is deemed eligible for such designation by a local, regional, or national jurisdiction as having historical, architectural, or cultural significance.

Front 392

Historic Structure

Back 392

A building, bridge, lighthouse, monument, pier, vessel, or other construction that is designated or that is deemed eligible for such designation by a local, regional, or national jurisdiction as having historical, architectural, or cultural significance. [914, 2005]

Front 393

Historic Structure

Back 393

A building, bridge, lighthouse, monument, pier, vessel, or other construction that is designated or that is deemed eligible for such designation by a local, regional, or national jurisdiction as having historical, architectural, or cultural significance. [914, 2007]

Front 394

Hitch

Back 394

A knot that attaches to or wraps around an object so that when the object is removed, the knot will fall apart.

Front 395

Hitch

Back 395

A knot that attaches to or wraps around an object so that when the object is removed, the knot will fall apart. [1670, 2004]

Front 396

HIV

Back 396

Human immunodeficiency virus.

Front 397

Hogged Fuel

Back 397

Wood refuse that has been chipped or shredded by a machine known as a hog.

Front 398

Hogged Material

Back 398

Mill waste consisting mainly of hogged bark but possibly including a mixture of bark, chips, dust, or other by-products from trees; also includes material designated as hogged fuel.

Front 399

Hogging

Back 399

Straining of the ship that tends to make the bow and stern lower than the middle portion.

Front 400

Hog (Wood Hog)

Back 400

A machine used to grind or reduce the size of wood, other feed stock, or scrap wood.

Front 401

Hoistway

Back 401

Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.

Front 402

Holder

Back 402

Any device used to hold a pyrotechnic device other than a mortar.

Front 403

Holding Area

Back 403

An area where flame effect material or loaded flame effect devices are held prior to use.

Front 404

Holding Area

Back 404

Location where the apparently uninjured aircraft occupants are transported.

Front 405

Holding Pump

Back 405

A backing (fore) pump used to hold a diffusion pump at efficient operating conditions while a roughing pump reduces system pressure to a point at which a valve between the diffusion pump and the system can be opened without stopping the flow of vapor from the nozzles.

Front 406

Holding Valve

Back 406

A valve that maintains hydraulic pressure in a hydraulic actuator
(cylinder, motor, etc.) until it is activated to release.

Front 407

Hold Space

Back 407

The space enclosed by the ship’s structure in which a cargo containment system is situated.

Front 408

Hold Time

Back 408

Period of time during which an extinguishant is required to maintain an even distribution throughout the protected volume in an amount at least at the extinguishing application density.

Front 409

Holdup Alarm

Back 409

An alarm that originates from a point where holdup protection is required, such as a bank teller window or store cash register.

Front 410

Holdup Alarm Initiating
Device

Back 410

An initiating device intended to enable an employee of a protected premises to transmit a signal indicating a robbery has transpired.

Front 411

Holdup Alarm System

Back 411

A system or portion thereof in which the initiation of a holdup signal is either semiautomatic or manual.

Front 412

Holiday

Back 412

A discontinuity in the coating system that includes, but is not limited to, voids, cracks, pinholes, or scratches.

Front 413

Hollow Metal Frame

Back 413

A frame formed from sheet metal.

Front 414

Hollow Structures

Back 414

Rudders, rudder stocks, skegs, castings, masts and booms, rails, lapped plates, and other attachments to a vessel that enclose a void space.

Front 415

Home Care

Back 415

Medical services (equipment) provided in residential occupancies. (ADM)

Front 416

Hood

Back 416

A device provided for a cooking appliance(s) to direct and capture grease-laden vapors and exhaust gases.

Front 417

Hood

Back 417

An enclosure, with or without gloveports or doors, characterized by the flow of air from the room to the enclosure.

Front 418

Hood Interior

Back 418

The volume enclosed by the side, back, and top enclosure panels, the work surface, the access opening (called the face), the sash or sashes, and the exhaust plenum, including the baffle system for airflow distribution.

Front 419

Hood (Rolling Steel Door)

Back 419

A sheet metal housing that mounts horizontally between the brackets, serving as an enclosure for the coiled curtain and closing the space between the door coil and the lintel.

Front 420

Hoop Stress

Back 420

The stress in a pipe wall, acting circumferentially in a plane perpendicular to the longitudinal axis of the pipe and produced by the pressure of the fluid in the pipe.

Front 421

Horizontal Access Door

Back 421

An access door installed in the horizontal plane used to protect openings in ceilings of fire resistance-rated floor-ceiling or
roof-ceiling assemblies.

Front 422

Horizontal Barrier

Back 422

A solid barrier in the horizontal position covering the entire rack, including all flue spaces at certain height increments, to prevent vertical fire spread.

Front 423

Horizontal Ceiling

Back 423

A ceiling with a slope not exceeding 2 in 12.

Front 424

Horizontal Channel

Back 424

Any uninterrupted space in excess of 5 ft (1.5 m) in length between horizontal layers of stored tires. Such channels can be formed by pallets, shelving, racks, or other storage arrangements.

Front 425

Horizontal Drainage Pipe

Back 425

A pipe or fitting that forms an angle of 45 degrees or less with the horizontal.

Front 426

Horizontal Exit

Back 426

An exit between adjacent areas on the same deck that passes through an A-60 Class boundary that is contiguous from side shell to side shell or to other A-60 Class boundaries.

Front 427

Horizontal Exit

Back 427

A way of passage from one building to an area of refuge in another building on approximately the same level, or a way of passage through or around a fire barrier to an area of refuge on approximately the same level in the same building that affords safety from fire and
smoke originating from the area of incidence and areas communicating therewith.

Front 428

Horizontal Exit

Back 428

A way of passage from one building to an area of refuge in another building on approximately the same level, or a way of passage through or around a fire barrier to an area of refuge on approximately the same level in the same building that affords safety from fire and
smoke originating from the area of incidence and areas communicating therewith. [101, 2006]

Front 429

Horizontal Exit

Back 429

A way of passage from one building to an area of refuge in another building on approximately the same level, or a way of passage through or around a fire barrier to an area of refuge on approximately the same level in the same building that affords safety from fire and
smoke originating from the area of incidence and areas communicating therewith. [101, 2009]

Front 430

Horizontal Pump

Back 430

A pump with the shaft normally in a horizontal position.

Front 431

Horizontal Rack

Back 431

A hose rack where the hose is connected to the valve, then stack-folded horizontally to the top of the rack.

Front 432

Horizontal Roll Paper Storage

Back 432

Rolls stored with the cores in the horizontal plane (on-side storage).

Front 433

Horizontal Separation

Back 433

The width of the permanent open space as measured horizontally between a building exterior wall and the adjacent property line or the centerline of a facing street, alley, or public way, or to an imaginary line drawn between exterior walls of adjacent buildings on the same lot.

Front 434

Horizontal Sliding Door

Back 434

A door installed in the vertical plane that slides in a direction that is perpendicular to the direction of egress travel.

Front 435

Horizontal Split-Case Pump

Back 435

A centrifugal pump characterized by a housing that is split parallel to the shaft.

Front 436

Horizontal Stabilizer

Back 436

That portion of an aircraft’s structure that contains the elevators.

Front 437

Horsepower Rating
(Combustion Gas Turbines)

Back 437

The ANSI standard rated power of an engine at the output shaft at
1.01325 bar (14.7 psia), at 15°C (59°F), and at a relative humidity of
60 percent.

Front 438

Horsepower Rating
(Reciprocating Engines)

Back 438

The power of an engine measured at the flywheel or output shaft at standard SAE conditions of 752.1 mm Hg (29.61 in. Hg) barometer at
25°C (77°F) inlet air temperature.

Front 439

Hose Assembly

Back 439

A powered rescue tool component consisting of hose with all permanently attached fittings that connect the powered rescue tool to the power unit.

Front 440

Hose Assembly

Back 440

Hose with couplings attached to both ends.

Front 441

Hose Connection

Back 441

A combination of equipment provided for connection of a hose to the standpipe system that includes a hose valve with a threaded outlet.

Front 442

Hose Connection

Back 442

A combination of equipment provided for connection of a hose to the standpipe system that includes a hose valve with a threaded outlet.
[14, 2007]

Front 443

Hose Connection

Back 443

A combination of equipment provided for the connection of a hose to a standpipe system that includes a hose valve with a threaded outlet.

Front 444

Hose House

Back 444

An enclosure located over or adjacent to a hydrant or other water supply designed to contain the necessary hose nozzles, hose wrenches, gaskets, and spanners to be used in fire fighting in conjunction with and to provide aid to the local fire department.

Front 445

Hose House

Back 445

An enclosure located over or adjacent to a hydrant or other water supply designed to contain the necessary hose nozzles, hose wrenches, gaskets, and spanners to be used in fire fighting in conjunction with and to provide aid to the local fire department. [24, 2007]

Front 446

Hose Nozzle

Back 446

A device intended for discharging water for manual suppression or extinguishment of a fire.

Front 447

Hose Nozzle Valve

Back 447

The terminal output end of a dispensing system hose.

Front 448

Hose Reel

Back 448

A circular device used to store hose.

Front 449

Hose Size

Back 449

An expression of the internal diameter of the hose.

Front 450

Hose Size

Back 450

An expression of the internal diameter of the hose. [1961, 2007]

Front 451

Hose Station

Back 451

A combination of a hose rack, hose nozzle, hose, and hose connection.

Front 452

Hose Station

Back 452

A combination of a hose rack, hose nozzle, hose, and hose connection. [14, 2007]

Front 453

Hose Valve

Back 453

The valve to an individual hose connection.

Front 454

Hose Valve

Back 454

The valve to an individual hose connection. [14, 2007]

Front 455

Hospital

Back 455

A building or portion thereof used on a 24-hour basis for the medical, psychiatric, obstetrical, or surgical care of four or more inpatients.

Front 456

Hospital

Back 456

A building or portion thereof used on a 24-hour basis for the medical, psychiatric, obstetrical, or surgical care of four or more inpatients. [101, 2003](ADM)

Front 457

Hospital

Back 457

A building or portion thereof used on a 24-hour basis for the medical, psychiatric, obstetrical, or surgical care of four or more inpatients. [101, 2009]

Front 458

Hospital

Back 458

A building or portion thereof used on a 24-hour basis for the medical, psychiatric, obstetrical, or surgical care of four or more inpatients. [101:3.3.124]

Front 459

Hospital

Back 459

A vessel or part of a vessel used on a 24-hour basis for the medical, obstetrical, or surgical care of four or more inpatients.

Front 460

Hospital-Based

Back 460

In the interpretation and application of this document, physically connected to a hospital. (GAS)

Front 461

Host Employer

Back 461

An employer who is in charge of coordinating work or who hires other employers to perform work at a multi-employer workplace.

Front 462

Hostile Fire

Back 462

Any instance of destructive and uncontrolled burning, including explosion, of combustible solids, liquids, or gases.

Front 463

Hot Box

Back 463

For the purpose of this standard, an enclosure or room used to raise and maintain the temperature of a container and its contents above ambient.

Front 464

Hot Brakes

Back 464

A condition in which the aircraft’s brake and wheel components have become overheated, usually due to excessive braking during landing.

Front 465

Hot Cell

Back 465

A heavily shielded enclosure in which radioactive material can be handled safely by persons working from outside the shield using remote tools and manipulators while viewing the work through special
leaded-glass or liquid-filled windows or through optical devices.

Front 466

Hotel

Back 466

A building or groups of buildings under the same management in which there are sleeping accommodations for more than 16 persons and primarily used by transients for lodging with or without meals.

Front 467

Hotel

Back 467

A building or groups of buildings under the same management in which there are sleeping accommodations for more than 16 persons and primarily used by transients for lodging with or without meals. [101,
2006]

Front 468

Hotel

Back 468

A building or groups of buildings under the same management in which there are sleeping accommodations for more than 16 persons and primarily used by transients for lodging with or without meals. [101,
2006] (SIG-HOU)

Front 469

Hotel

Back 469

A building or groups of buildings under the same management in which there are sleeping accommodations for more than 16 persons and primarily used by transients for lodging with or without meals. [101,
2009]

Front 470

Hotel

Back 470

A building or groups of buildings under the same management in which there are sleeping accommodations for more than 16 persons and primarily used by transients for lodging with or without meals. [101:3.3]

Front 471

Hot Spot

Back 471

A particularly active part of a wildland fire.

Front 472

Hot Tapping

Back 472

The technique of welding and drilling on in-service tanks or containers that contain flammable, combustible, or other hazardous substances.

Front 473

Hot Tapping

Back 473

The technique of welding and drilling on in-service tanks or containers that contain flammable, combustible, or other hazardous substances. [326, 2005]

Front 474

Hot Taps

Back 474

Piping connections made to operating pipelines or mains or other facilities while they are in operation. The connection of the branch piping to the operating line and the tapping of the operating line are done while it is under gas pressure.

Front 475

Hot Tub

Back 475

A spa constructed of wood, with sides and bottoms formed separately, and the whole shaped to join together by pressure from the surrounding hoops, bands, or rods.

Front 476

Hot Water Heating Boiler

Back 476

A boiler designed to heat water for circulation through an external space heating system.

Front 477

Hot Water Supply Boiler

Back 477

A boiler used to heat water for purposes other than space heating.

Front 478

Hot Water Supply Boiler

Back 478

A low-pressure hot water boiler having a volume exceeding 120 gal (454
L), or a heat input exceeding 200,000 Btu/hr (58.6 kW), or an operating
temperature exceeding 200°F (93°C) that provides hot water to be used
outside the boiler.

Front 479

Hot Work

Back 479

Any activity involving riveting, welding, burning, the use of
powder-actuated tools or similar fire-producing operations, including any
operation that raises the temperature of the work piece to 204°C (400°F)
or above. Grinding, drilling, abrasive blasting, or similar spark-producing
operations are also considered hot work except when such operations are
isolated physically from any atmosphere containing more than
10 percent of the lower explosive limit of a flammable or combustible
substance.

Front 480

Hot Work

Back 480

Any work involving burning, spark producing, welding, or similar operations that is capable of initiating fires or explosions.

Front 481

Hot Work

Back 481

Any work involving burning, welding, or similar operations that is capable of initiating fires or explosions.

Front 482

Hot Work

Back 482

Any work that is a source of ignition, including open flames, cutting and welding, sparking of electrical equipment, grinding, buffing, drilling, chipping, sawing, or other operations that create hot metal sparks or surfaces from friction or impact.

Front 483

Hot Work

Back 483

For the purpose of handling releases of flammable and combustible liquids and gases, any work that is a source of ignition, including open flames, cutting and welding, sparking of electrical equipment, grinding, buffing, drilling, chipping, sawing, or other operations that create hot metal sparks or surfaces from friction or impact.

Front 484

Hot Work

Back 484

Work involving burning, welding, or a similar operation that is capable of initiating fires or explosions.

Front 485

Hot Work

Back 485

Work involving burning, welding, or a similar operation that is capable of initiating fires or explosions. [51B, 2003]

Front 486

Hot Work

Back 486

Work involving burning, welding, or a similar operation that is capable of initiating fires or explosions. [51B:3.3]

Front 487

Hot Zone

Back 487

The area immediately surrounding the physical location of a fire having a boundary that extends far enough from the fire to protect industrial fire brigade members positioned outside the hot zone from being directly exposed to flames, dense smoke, or extreme temperatures.

Front 488

Hot Zone

Back 488

The area immediately surrounding the physical location of a fire having a boundary that extends far enough from the fire to protect industrial fire brigade members positioned outside the hot zone from being directly exposed to flames, dense smoke, or extreme temperatures. [600, 2005]

Front 489

Hot Zone

Back 489

The control zone immediately surrounding a hazardous area, which extends far enough to prevent adverse effects to personnel outside the zone.

Front 490

Hot Zone

Back 490

The control zone immediately surrounding a hazardous area, which extends far enough to prevent adverse effects to personnel outside the zone. [1500, 2007]

Front 491

Hot Zone

Back 491

The control zone immediately surrounding a hazardous materials incident that extends far enough to prevent adverse effects from hazardous materials releases to personnel outside the zone.

Front 492

Hot Zone

Back 492

The control zone immediately surrounding hazardous materials/weapons of mass destruction (WMD) incidents, which extends far enough to prevent adverse effects of hazards to personnel outside the zone.

Front 493

Hot Zone

Back 493

The control zone of an incident that includes the fire area or the area immediately surrounding hazardous materials and that extends far enough to prevent adverse effects from fire, products of combustion and/or hazardous materials releases to personnel outside the zone.

Front 494

House

Back 494

A superstructure above the main deck.

Front 495

Household Broiler Cooking
Appliance

Back 495

A unit that cooks primarily by radiated heat.

Front 496

Household Built-In Unit
Cooking Appliance

Back 496

A unit designed to be recessed into, placed upon, or attached to the construction of a building, but not for installation on the floor.

Front 497

Household Carbon Monoxide
Detection System

Back 497

A system of devices that uses a control unit to produce an alarm signal in the household for the purpose of notifying the occupants of the presence of concentrations of carbon monoxide that could pose a life safety risk.

Front 498

Household Cooking Appliance

Back 498

An appliance for domestic food preparation, providing at least one function of (1) top or surface cooking, (2) oven cooking, or (3) broiling.

Front 499

Household Fire Alarm System

Back 499

A system of devices that uses a fire alarm control unit to produce an alarm signal in the household for the purpose of notifying the occupants of the presence of a fire so that they will evacuate the premises. (SIG-HOU)

Front 500

HRSG Control System

Back 500

The group of control systems that regulate the HRSG process, including the combustion control system but not the burner management system.

Front 501

HRSG Enclosure

Back 501

All ductwork from the combustion turbine exhaust through the steam generator to the stack, including any bypass duct connection.

Front 502

HRSG System

Back 502

The unit assembly from the combustion turbine inlet to the flue gas outlet to the atmosphere.

Front 503

HSPD-5

Back 503

The abbreviation for Homeland Security Presidential
Directive/HSPD-5, Management of Domestic Incidents.

Front 504

Hull

Back 504

The main structural frame or body of a vessel below the weather deck.

Front 505

Hull Potential Monitor

Back 505

A dc meter that measures the potential of a metallic hull or metallic hull fittings as compared to a reference electrode.

Front 506

Human Exposure

Back 506

Potential for injury or death to humans.

Front 507

Human/Machine Interface
(HMI)

Back 507

The point at which people control or monitor the condition of an electronic premises security system.

Front 508

Humidifier

Back 508

A device used for adding water vapor to inspired gas. (GAS)

Front 509

Hunt Group

Back 509

A group of associated telephone lines within which an incoming call is automatically routed to an idle (not busy) telephone line for completion. (SIG-SSS)

Front 510

HVAC

Back 510

Heating, ventilation, and air conditioning systems and their related components.

Front 511

Hybrid Mixture

Back 511

A mixture of a dust with one or more flammable gases or vapors.

Front 512

Hybrid Mixture

Back 512

A mixture of a flammable gas at greater than 10 percent of its lower flammable limit with either a combustible dust or a combustible mist.

Front 513

Hybrid Mixture

Back 513

A mixture of a flammable gas at greater than 10 percent of its lower flammable limit with either a combustible dust or a combustible mist. [68, 2007]

Front 514

Hybrid Mixture

Back 514

A mixture of a flammable gas with either a combustible dust or a combustible mist. [68, 2002]

Front 515

Hybrid Pressure System

Back 515

A piping system in which the pressure at the point of delivery is reduced by one or more line pressure regulators prior to the appliance connection.

Front 516

Hybrid Rocket Motor

Back 516

A rocket motor in which one or more of the fuels exist in a physical state (solid, liquid, or gaseous) different than the oxidizer and that derives its force or thrust from the combination thereof.

Front 517

Hybrid Rocket Motor

Back 517

A rocket motor that utilizes a fuel and an oxidizer in different physical states (solid, liquid, or gaseous).

Front 518

Hybrid System

Back 518

A system comprised of multiple power sources. These power sources may include photovoltaic, wind, micro-hydro generators,
engine-driven generators, and others, but do not include electrical production and distribution network systems. Energy storage systems, such as batteries, do not constitute a power source for the purpose of this definition.

Front 519

Hybrid Water Mist Nozzles

Back 519

Nozzles capable of operation using both automatic and nonautomatic means.

Front 520

Hydrant

Back 520

An exterior valved connection to a water supply system that provides hose connections.

Front 521

Hydrant

Back 521

An exterior valved connection to a water supply system that provides hose connections. [24, 2007]

Front 522

Hydrant

Back 522

A valved hose connection.

Front 523

Hydrant Butt

Back 523

The hose connection outlet of a hydrant.

Front 524

Hydrant Butt

Back 524

The hose connection outlet of a hydrant. [24, 2007]

Front 525

Hydrant Cart

Back 525

A non-driven vehicle used to deliver fuel from a hydrant to an aircraft.

Front 526

Hydrant Valve

Back 526

An outlet of an airport fueling system that includes a
deadman-controlled valve and adapter assembly to which a coupler on
a hose or other flexible conduit on an aircraft fuel servicing vehicle
can be connected.

Front 527

Hydration

Back 527

The introduction of water in the form of food or fluids into the body.

Front 528

Hydraulically Calculated Water
Demand Flow Rate

Back 528

The water flow rate for a system or hose stream that has been calculated using accepted engineering practices.

Front 529

Hydraulically Calculated Water
Demand Flow Rate

Back 529

The water flow rate for a system or hose stream that has been calculated using accepted engineering practices. [24, 2007]

Front 530

Hydraulically Designed System

Back 530

A calculated sprinkler system in which pipe sizes are selected on a pressure loss basis to provide a prescribed water density, in gallons per minute per square foot (mm/min), or a prescribed minimum discharge pressure or flow per sprinkler, distributed with a reasonable degree of uniformity over a specified area.

Front 531

Hydraulic Diameter

Back 531

A diameter for noncircular cross sections that is determined by 4(A/p), where A is the cross-sectional area normal to the longitudinal axis of the space and p is the perimeter of the cross section.

Front 532

Hydrocarbon

Back 532

A chemical substance consisting of only hydrogen and carbon atoms.

Front 533

Hydrocarbon

Back 533

A chemical substance consisting of only hydrogen and carbon atoms. [36,
2004]

Front 534

Hydrogen Generator

Back 534

A packaged or factory matched hydrogen gas generation device that (a) uses electrochemical reactions to electrolyze water to produce hydrogen and oxygen gas (electrolyzer) and (b) converts hydrocarbon fuel to a hydrogen-rich stream of composition and conditions suitable for the type of device (e.g., fuel cells) using the hydrogen (reformer).

Front 535

Hydrogen (H2)

Back 535

Hydrogen in gaseous or liquid form for use as a vehicular fuel.

Front 536

Hydrogen Sulfide (H2S)

Back 536

A toxic and lethal gas produced in sewers and digesters by anaerobic decomposition of wastewater solids or other anaerobic wastewater or sludge treatment processes.

Front 537

Hydrology

Back 537

Effect of water, its movement, and mechanics, in relation to bodies of water.

Front 538

Hydromassage Bathtub

Back 538

A permanently installed bathtub equipped with a recirculating piping system, pump, and associated equipment. It is designed so it can accept, circulate, and discharge water upon each use.

Front 539

Hydrostatic Test

Back 539

A test of a closed piping system and its attached appurtenances consisting of subjecting the piping to an increased internal pressure for a specified period of duration to verify system integrity and leak rates.

Front 540

Hydrostatic Test

Back 540

A test of a closed piping system and its attached appurtenances consisting of subjecting the piping to an increased internal pressure for a specified period of duration to verify system integrity and leak rates. [24, 2007]

Front 541

Hydrostatic Testing

Back 541

Pressure testing of the extinguisher to verify its strength against unwanted rupture.

Front 542

Hyperbaric

Back 542

Facility, building, or structure used to house chambers and all auxiliary service equipment for medical applications and procedures at pressures above normal atmospheric pressures. (HYP)

Front 543

Hyperbaric

Back 543

Pressure greater than ambient.

Front 544

Hyperbaric Oxygenation

Back 544

The application of pure oxygen or an oxygen-enriched gaseous mixture to a subject at elevated pressure. (HYP)

Front 545

Hypergolic Material

Back 545

Any substance that will spontaneously ignite or explode upon exposure to an oxidizer.

Front 546

Hypobaric

Back 546

An adjective referring to pressures below (lower than) atmospheric pressure.

Front 547

Hypobaric

Back 547

Facility, building, or structure used to house chambers and all auxiliary service equipment for medical applications and procedures at pressures below atmospheric pressures. (HYP)

Front 548

Hypobaric

Back 548

Pressure less than ambient.

Front 549

Hypobaric Facility

Back 549

A facility that is designed to provide an oxygen-enriched atmosphere in which the concentration of oxygen exceeds 23.5 percent by volume, and a pressure less than 760 mm Hg.

Front 550

Hypoxia

Back 550

A state of inadequate oxygenation of the blood and tissue sufficient to cause impairment of function.

Front 551

Hypoxia

Back 551

A state of inadequate oxygenation of the blood and tissue sufficient to cause impairment of function. [99B, 2005] (HYP)

Front 552

ICC

Back 552

The Interstate Commerce Commission, which had jurisdiction over high-pressure cylinders and cartridges prior to 1967.

Front 553

ICC

Back 553

U.S. Interstate Commerce Commission.

Front 554

ICC

Back 554

U.S. Interstate Commerce Commission. [58, 2008]

Front 555

Identical Rescue Tools

Back 555

Powered rescue tools that are produced to the same engineering and manufacturing specifications.

Front 556

Identical SCBA

Back 556

SCBA that are produced to the same engineering and manufacturing specifications.

Front 557

Identification Credential

Back 557

A device or scheme containing some knowledge (personal identification number or code) or a biometric identifier.

Front 558

Identified (as applied to equipment)

Back 558

Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular code or standard requirement. [70:100]

Front 559

Identified (as applied to equipment)

Back 559

Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular Code requirement.

Front 560

Identified (as applied to equipment)

Back 560

Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular Code requirement. [70:100.I]

Front 561

Identified (as applied to equipment)

Back 561

Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular code requirement.[70, 2008]

Front 562

Identify

Back 562

To select or indicate verbally or in writing using standard terms to establish the fact of an item being the same as the one described.

Front 563

Identify

Back 563

To select or indicate verbally or in writing using standard terms to establish the identity of; the fact of being the same as the one described.

Front 564

Igniter

Back 564

An electrical, chemical, or mechanical device used to fire pyrotechnics.

Front 565

Igniter

Back 565

A permanently installed device that provides proven ignition energy to light off the main burner.

Front 566

Ignitibility

Back 566

The ease with which fuel undergoes ignition.

Front 567

Ignitibility

Back 567

The propensity for ignition, as measured by the time to sustained flaming, in seconds, at a specified heating flux.

Front 568

Ignitible Liquid

Back 568

Any liquid or the liquid phase of any material that is capable of
fueling a fire, including a flammable liquid, combustible liquid, or any
other material that can be liquefied and burn.

Front 569

Ignitible Liquid

Back 569

Any liquid or the liquid phase of any material that is capable of
fueling a fire, including a flammable liquid, combustible liquid, or any
other material that can be liquefied and burned.

Front 570

Ignitible Mixture

Back 570

A combustible material that is within its flammable range.

Front 571

Ignitible Mixture

Back 571

A gas-air, vapor-air, mist-air, or dust-air mixture, or combinations of such mixtures, that can be ignited by a sufficiently strong source of energy, such as a static electric discharge.

Front 572

Ignition

Back 572

Continuous, self-sustaining, smoldering combustion of upholstered furniture substrates after exposure to burning cigarettes.

Front 573

Ignition

Back 573

The momentary event when fire first occurs.

Front 574

Ignition

Back 574

The process of initiating self-sustained combustion.

Front 575

Ignition

Back 575

The process of initiating self-sustained combustion. [921, 2004]

Front 576

Ignition-Capable Equipment

Back 576

Equipment that, under normal operation, produces sparks, hot surfaces, or a flame that can ignite a specific flammable atmosphere.

Front 577

Ignition Energy

Back 577

The quantity of heat energy that should be absorbed by a substance to ignite and burn.

Front 578

Ignition Protection

Back 578

The design and construction of a device such that, under the designed operating conditions, the device does not initiate ignition when surrounded by a flammable hydrocarbon mixture if an ignition source causes an internal explosion, the device is incapable of releasing sufficient electrical or thermal energy to ignite a hydrocarbon mixture, and the source of ignition is hermetically sealed.

Front 579

Ignition-Resistant Material

Back 579

Any product designed for exterior exposure that, when tested in accordance with applicable standards, has a flame spread of not more than 25, shows no evidence of progressive combustion, and whose flame front does not progress more than 101/2 ft (3.2 m) beyond the centerline of the burner at any time during the test.

Front 580

Ignition Sensitivity

Back 580

A measure of the ease by which a cloud of combustible dust could be ignited.

Front 581

Ignition Source

Back 581

Any item or substance capable of an energy release of a type and magnitude sufficient to ignite any flammable mixture of gases or vapors that could occur onboard the vessel.

Front 582

Ignition Source

Back 582

Any item or substance capable of an energy release of type and magnitude sufficient to ignite any flammable mixture of gases or vapors that could occur at the site or onboard the vehicle.

Front 583

Ignition Source Isolation

Back 583

A method employing equipment and procedures that interrupts the propagation of an igniting medium past a predetermined point.

Front 584

Ignition Temperature

Back 584

Minimum temperature a substance should attain in order to ignite under specific test conditions.

Front 585

Ignition Temperature

Back 585

Minimum temperature a substance should attain in order to ignite under specific test conditions. [921, 2004]

Front 586

Ignition Temperature

Back 586

The autoignition temperature of a flammable gas or vapor or the lower of either the layer ignition temperature or cloud ignition temperature of a combustible dust.

Front 587

Ignition Temperature

Back 587

The lowest temperature at which a gas-air mixture can ignite and continue to burn; also referred to as autoignition temperature.

Front 588

Ignition Temperature

Back 588

The minimum temperature required to initiate or cause self-sustaining combustion independently of the heating or heated element under specified environmental conditions. Ignition temperatures are commonly reported as the autogenous ignition temperature, autoignition temperature (AIT), or spontaneous ignition temperature (SIT).

Front 589

Ignition Time

Back 589

The time between the application of an ignition source to a material and the onset of self-sustained combustion.

Front 590

Ignition Zone

Back 590

The location on the burner where ignition and combustion of the main burner fuel occurs.

Front 591

Imhoff Tank

Back 591

A deep, two-story wastewater treatment tank consisting of an upper continuous-flow sedimentation chamber and a lower sludge digestion chamber.

Front 592

Immediate Landscaped Area

Back 592

The area of the structure ignition zone extending at least 30 ft (9 m) from the foundation of the structure, including the footprint on decks and all extensions, and the area in which the vegetation has been modified for reduced flammability or aesthetic purposes, such as lawns and gardens.

Front 593

Immediately Dangerous to
Life and Health (IDLH)

Back 593

A concentration of airborne contaminants, normally expressed in parts per million (ppm) or milligrams per cubic meter, that
represents the maximum level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects.

Front 594

Immediately Dangerous to
Life and Health (IDLH)

Back 594

A concentration of airborne contaminants, normally expressed in parts per million (ppm) or milligrams per cubic meter, that
represents the maximum level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. [55, 2005]

Front 595

Immediately Dangerous to
Life and Health (IDLH)

Back 595

Any condition that would pose an immediate or delayed threat to life, cause irreversible adverse health effects, or interfere with an individual’s ability to escape unaided from a hazardous environment. [1670, 2004]

Front 596

Immediately Dangerous to
Life or Health (IDLH)

Back 596

Any condition that would pose an immediate or delayed threat to life, cause irreversible adverse health effects, or interfere with an individual’s ability to escape unaided from a hazardous environment.

Front 597

Immediately Dangerous to
Life or Health (IDLH)

Back 597

Any condition that would pose an immediate or delayed threat to life, cause irreversible adverse health effects, or interfere with an individual’s ability to escape unaided from a hazardous environment. [1670, 2004]

Front 598

Immediate Restoration of
Service

Back 598

Automatic restoration of operation with an interruption of not more than 10 seconds. (ELS)

Front 599

Imminent Danger

Back 599

A condition or practice in an occupancy or structure that poses a danger that could reasonably be expected to cause death, serious physical harm, or serious property loss.

Front 600

Imminent Danger

Back 600

A condition or practice in an occupancy or structure that poses a danger that could reasonably be expected to cause death, serious physical harm, or serious property loss. [1, 2009]

Front 601

Imminent Hazard

Back 601

An act or condition that is judged to present a danger to persons or property and is so immediate and severe that it requires immediate corrective or preventive action.

Front 602

Imminent Hazard

Back 602

An act or condition that is judged to present a danger to persons or property that is so urgent and severe that it requires immediate corrective or preventive action.

Front 603

Imminent Hazard

Back 603

An act or condition that is judged to present a danger to persons or property that is so urgent and severe that it requires immediate corrective or preventive action. [1521, 2007]

Front 604

Immobilize

Back 604

Fix in place, so that no movement can occur.

Front 605

Immunization

Back 605

The process or procedure by which a person is rendered immune.

Front 606

Impact Analysis [Business
Impact Analysis (BIA)]

Back 606

A management level analysis that identifies the impacts of losing the entity’s resources.

Front 607

Impact Load

Back 607

Sudden application of a force, which causes kinetic energy and momentum to be converted into other forms of energy.

Front 608

Impairment

Back 608

A condition where a fire protection system or unit or portion thereof is out of order, and the condition can result in the fire protection system or unit not functioning in a fire event.

Front 609

Impairment

Back 609

A shutdown of a system or portion thereof. [25, 2002]

Front 610

Impedance

Back 610

Impedance is the ratio of the voltage drop across a circuit element to the current flowing through the same circuit element. The unit of impedance is the ohm. (ELE)

Front 611

Impedance Heating System

Back 611

A system in which heat is generated in a pipeline or vessel wall by causing current to flow through the pipeline or vessel wall by direct connection to an ac voltage source from a dual-winding transformer.

Front 612

Impedance Heating System

Back 612

A system in which heat is generated in a pipe or rod, or combination of pipes and rods, by causing current to flow through the pipe or rod by direct connection to an ac voltage source from a dual-winding transformer. The pipe or rod shall be permitted to be embedded in the surface to be heated, or constitute the exposed components to be heated.

Front 613

Impingement

Back 613

The striking of a protected surface by water droplets issuing directly from a water spray nozzle.

Front 614

Implosion

Back 614

The rapid inward collapsing of the walls of a vacuum component or device as the result of failure of the walls to sustain the atmospheric pressure.

Front 615

Importance Factor (I)

Back 615

A factor that accounts for the degree of hazard to human life and damage to property. [ASCE/SEI 7:6.2]

Front 616

Important Building

Back 616

A building that is considered not expendable in an exposure fire.

Front 617

Important Building

Back 617

A building that is considered not expendable in an exposure fire. [30,
2003]

Front 618

Important Building

Back 618

A building that is considered not expendable in an exposure fire. [30,
2008]

Front 619

Important Building

Back 619

A building that is considered not expendable in an exposure fire. [30:3.3]

Front 620

Important Record

Back 620

A record for which a reproduction, although acceptable as a substitute for the original, could be obtained only at considerable expense and labor or only after considerable delay.

Front 621

Important Records

Back 621

Records that could be reproduced only at considerable expense and labor or only after considerable delay.

Front 622

Important Structures

Back 622

A structure that is considered not expendable in an exposure fire.

Front 623

Impounding Area

Back 623

An area defined through the use of dikes or the site topography for the purpose of containing any accidental spill of LNG or flammable refrigerants.

Front 624

Impounding Area

Back 624

An area that can be defined through the use of containment or the topography at the site for the purpose of containing any accidental spill of LNG, LH2, or flammable refrigerants.

Front 625

Impractical Evacuation
Capability

Back 625

The inability of a group to reliably move to a point of safety in a timely manner.

Front 626

Impressed Current System

Back 626

A cathodic protection system that uses an external power source to induce a dc electric current through an electrode (anode) that suppresses galvanic corrosion of the craft’s hull.

Front 627

Improved Property

Back 627

A piece of land or real estate upon which a structure has been placed, a marketable crop is growing (including timber), or other property improvement has been made.

Front 628

Improved Property

Back 628

A piece of land or real estate upon which a structure has been placed, a marketable crop is growing (including timber), or other property improvement has been made. [1144, 2002]

Front 629

Improved Surfaces

Back 629

Surfaces that are classed as main thoroughfares, paved roadways, runways, taxiways, parking aprons, and secondary routes of vehicle travel including mediums that are normally of paved, asphalted, or concrete construction.

Front 630

Inactive Leaf

Back 630

One door of a pair of doors that ordinarily is latched closed; the second operating door of a pair.

Front 631

Inactive Record

Back 631

A record that does not have to be readily available for current business operations or use.

Front 632

Inboard Engine

Back 632

Any internal combustion engine other than an outboard engine permanently mounted within the hull.

Front 633

Inby

Back 633

A mining term that means in the direction of the face of the mine or further into the mine.

Front 634

Incapacitation

Back 634

A condition under which humans do not function adequately and become unable to escape untenable conditions.

Front 635

Incapacitation

Back 635

A condition under which humans do not function adequately and become unable to escape untenable conditions. [101, 2003]

Front 636

Incapacitation

Back 636

A condition under which humans do not function adequately and become unable to escape untenable conditions. [101, 2009]

Front 637

Incendiary Fire Cause

Back 637

A fire that is intentionally ignited under circumstances in which the person knows that the fire should not be ignited.

Front 638

Incident

Back 638

An emergency involving the release or potential release of hazardous materials/weapons of mass destruction (WMD).

Front 639

Incident

Back 639

An emergency involving the release or potential release of hazardous materials/WMD.

Front 640

Incident

Back 640

An event to which the reporting agency responds or should have responded.

Front 641

Incident

Back 641

An occurrence, either human-caused or a natural phenomenon, that requires action or support by emergency services personnel to prevent or minimize loss of life or damage to property and/or natural resources.

Front 642

Incident

Back 642

An occurrence, either human-caused or a natural phenomenon, that requires action or support by emergency services personnel to prevent or minimize loss of life or damage to property and/or natural resources. [1143, 2003]

Front 643

Incident

Back 643

An occurrence, either human-caused or a natural phenomenon, that requires action or support by emergency services personnel to prevent or minimize loss of life or damage to property and/or natural resources. [1143, 2009]

Front 644

Incident

Back 644

An occurrence, either human-caused or a natural phenomenon, that requires action or support by emergency services personnel to prevent or minimize loss of life or damage to property and/or natural resources. [1143:3.3]

Front 645

Incident

Back 645

In a mine or tunnel, an event or condition that threatens life or property and adversely affects the environment in the space.

Front 646

Incident Action Plan

Back 646

An oral or written plan approved by the incident commander containing general objectives reflecting the overall strategy for managing an incident.

Front 647

Incident Action Plan

Back 647

A verbal plan, written plan, or combination of both, that is updated throughout the incident and reflects the overall incident strategy, tactics, risk management, and member safety that are developed by the incident commander. [1561, 2005]

Front 648

Incident Action Plan

Back 648

A written management plan developed or approved by the Incident Commander that establishes the overall strategic decisions and assigns tactical objectives for the incident.

Front 649

Incident Action Plan

Back 649

A written or verbal plan stating the overall objectives, strategy, and specific tactics for a specified period of time.

Front 650

Incident Action Plan

Back 650

The objectives reflecting the overall incident strategy, tactics, risk management, and member safety that are developed by the incident commander. Incident action plans are updated throughout the incident.

Front 651

Incident Action Plan

Back 651

The objectives reflecting the overall incident strategy, tactics, risk management, and member safety that are developed by the incident commander. Incident action plans are updated throughout the incident. [1500, 2007]

Front 652

Incident Action Plan (IAP)

Back 652

A plan that contains objectives reflecting the overall incident strategy, specific tactical actions, and supporting information for the next operational period. The plan may be oral or written. When written, the plan may have a number of attachments, including incident objectives, organization assignment list, division assignment, incident radio communication plan, medical plan, traffic plan, safety plan, and incident map. Formerly called “shift plan.”

Front 653

Incident Action Plan (IAP)

Back 653

A verbal or written plan containing incident objectives reflecting the overall strategy and specific control actions where appropriate for managing an incident or planned event.

Front 654

Incidental Liquid Use or
Storage

Back 654

Use or storage as a subordinate activity to that which establishes the occupancy or area classification.

Front 655

Incidental Liquid Use or
Storage

Back 655

Use or storage as a subordinate activity to that which establishes the occupancy or area classification. [30, 2008]

Front 656

Incidental Occupancies in
Stations

Back 656

The use of the station by others who are neither transit system employees nor passengers.

Front 657

Incidental Testing Facility

Back 657

An area within a production facility set aside for the purpose of conducting in-process control tests that are related to the production process.

Front 658

Incident Casualty

Back 658

A person who is injured or killed as a result of responding to or handling an incident or who is the reason for the incident.

Front 659

Incident Commander

Back 659

The fire department member in overall command of an emergency incident.

Front 660

Incident Commander

Back 660

The individual in overall command of an emergency incident. [1561, 2005]

Front 661

Incident Commander

Back 661

The person who is responsible for all decisions relating to the management of the incident and is in charge of the incident site. [472,
2002]

Front 662

Incident Commander

Back 662

The person who is responsible for all decisions relating to the management of the incident and is in charge of the incident site. [472:3.3]

Front 663

Incident Commander (IC)

Back 663

The individual in overall command of an emergency incident. [1561,
2005]

Front 664

Incident Commander (IC)

Back 664

The individual responsible for all incident activities, including the development of strategies and tactics and the ordering and release of resources.

Front 665

Incident Commander (IC)

Back 665

The individual responsible for all incident activities, including the development of strategies and tactics and the ordering and the release of resources.

Front 666

Incident Commander (IC)

Back 666

The individual responsible for all incident activities, including the development of strategies and tactics and the ordering and the release of resources. [472, 2008]

Front 667

Incident Commander (IC)

Back 667

The individual responsible for the management of all incident operations at the incident site.

Front 668

Incident Commander (IC)

Back 668

The person who is responsible for all decisions relating to the management of the incident and is in charge of the incident site. [472, 2002]

Front 669

Incident Command Post (ICP)

Back 669

The field location at which the primary tactical-level, on-scene incident command functions are performed.

Front 670

Incident Command System

Back 670

A management system designed to enable effective and efficient on-scene incident management by integrating a combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure.

Front 671

Incident Command System
(ICS)

Back 671

A management system designed to enable effective and efficient on-scene incident management by integrating a combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure.

Front 672

Incident Command System
(ICS)

Back 672

A standardized on-scene emergency management construct specifically designed to provide for the adoption of an integrated organizational structure that reflects the complexity and demands of single or multiple incidents, without being hindered by jurisdictional boundaries.

Front 673

Incident Command System
(ICS)

Back 673

A standardized on-scene emergency management construct specifically designed to provide for the adoption of an integrated organizational structure that reflects the complexity and demands of single or multiple incidents, without being hindered by jurisdictional boundaries. ICS is a combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure, designed to aid in the management of resources during incidents. It is used for all kinds of emergencies and is applicable to small as well as large and complex incidents. ICS is used by various jurisdictions and functional agencies, both public and private, to organize field-level incident management operations.

Front 674

Incident Command System
(ICS)

Back 674

The combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure that has responsibility for the management of assigned resources to effectively accomplish stated objectives pertaining to an incident or training exercise.

Front 675

Incident Command System
(ICS)

Back 675

The combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure that has responsibility for the management of assigned resources to effectively accomplish stated objectives pertaining to an incident or training exercise. [1670, 2004]

Front 676

Incident Command System
(ICS)

Back 676

The combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure that has responsibility for the management of assigned resources to effectively accomplish stated objectives pertaining to an incident or training exercise. [1670, 2004] (HCE)

Front 677

Incident Energy

Back 677

The amount of energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. One of the units used to measure incident energy is calories per centimeter squared (cal/cm2).

Front 678

Incident Location

Back 678

The address or other identifiable area of an event.

Front 679

Incident Management System

Back 679

A plan that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations.

Front 680

Incident Management System

Back 680

A system that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency incidents and other functions. [1561, 2005]

Front 681

Incident Management System

Back 681

A system that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations; the system is also referred to as an incident command system (ICS).

Front 682

Incident Management System

Back 682

The combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure with responsibility for the management of assigned resources to effectively accomplish stated objectives pertaining to an incident.

Front 683

Incident Management System
(IMS)

Back 683

An organized system of roles, responsibilities, and standard operating procedures used to manage emergency operations.

Front 684

Incident Management System
(IMS)

Back 684

A plan that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations to include the incident command system, multi-agency coordination system, training, and management of resources.

Front 685

Incident Management System
(IMS)

Back 685

A system that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations; the system is also referred to as an incident command system (ICS).

Front 686

Incident Management System
(IMS)

Back 686

A system that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations; the system is also referred to as an incident command system (ICS).
[1021, 2003]

Front 687

Incident Management System
(IMS)

Back 687

A system that defines the roles and responsibilities to be assumed by personnel and the operating procedures to be used in the management and direction of emergency operations; the system is also referred to as an incident command system (ICS). [1021: 3.3]

Front 688

Incident Management System
(IMS)

Back 688

A system that defines the roles and responsibilities to be assumed by responders and the standard operating procedures to be used in the management and direction of emergency incidents and other functions.

Front 689

Incident Management System
(IMS)

Back 689

A system that defines the roles and responsibilities to be assumed by responders and the standard operating procedures to be used in the management and direction of emergency incidents and other functions. [1561, 2005]

Front 690

Incident Management System
(IMS)

Back 690

A system that defines the roles and responsibilities to be assumed by responders and the standard operating procedures to be used in the management and direction of emergency incidents and other functions. [1561, 2008]

Front 691

Incident Management System
(IMS)

Back 691

The combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure, designed to aid in the management of resources during incidents.

Front 692

Incident Management Team
(IMT)

Back 692

The incident commander and appropriate command and general staff personnel assigned to an incident.

Front 693

Incident Management Team
(IMT)

Back 693

The Incident Commander and other incident management personnel assigned to an incident or planned event.

Front 694

Incident Objectives

Back 694

Statements of guidance and direction that are achievable, measurable, and necessary for the selection of appropriate strategy(ies) and the tactical direction of resources.

Front 695

Incident or Onset Time

Back 695

The time the incident occurred or the time that the symptoms developed.

Front 696

Incident Record

Back 696

The official file on an incident.

Front 697

Incident Report

Back 697

A document prepared by fire department personnel on a particular incident.

Front 698

Incident Response Plan

Back 698

Written procedures, including standard operating guidelines, for managing an emergency response and operation.

Front 699

Incident Safety Officer

Back 699

A member of the command staff responsible for monitoring and assessing safety hazards and unsafe situations, and for developing measures for ensuring personnel safety.

Front 700

Incident Safety Officer

Back 700

An individual appointed to respond or assigned at an incident scene by the incident commander to perform the duties and responsibilities of that position as part of the command staff.

Front 701

Incident Safety Officer (ISO)

Back 701

A member of the command staff responsible for monitoring and assessing safety hazards or unsafe situations and for developing measures for ensuring personnel safety.

Front 702

Incident Safety Plan

Back 702

Hazard control strategies developed by the incident safety officer to address the incident action plan and the type of incident encountered.

Front 703

Incident Scene

Back 703

The location where activities related to a specific incident are conducted.

Front 704

Incident Scene

Back 704

The location where activities related to a specific incident are conducted. [1561, 2005]

Front 705

Incident Termination

Back 705

The conclusion of emergency service operations at the scene of an incident, usually the departure of the last unit from the scene.

Front 706

Incineration

Back 706

Combustion or controlled burning of volatile organic matter in sludge and solid waste that reduces the volume of the material while producing heat, dry inorganic ash, and gaseous emissions.

Front 707

Incinerator

Back 707

An appliance or combustion chamber for the reduction, by burning, of rubbish, garbage, and other wastes.

Front 708

Incinerator

Back 708

Equipment predominantly designed for burning solid waste.

Front 709

Incipient Fire Fighting

Back 709

Fire fighting performed inside or outside of an enclosed structure or building when the fire has not progressed beyond incipient stage.

Front 710

Incipient Stage

Back 710

Refers to the severity of a fire where the progression is in the early stage and has not developed beyond that which can be extinguished using portable fire extinguishers or handlines flowing up to 473 L/min (125 gpm). A fire is considered to be beyond the incipient stage when the use of thermal protective clothing or self-contained breathing apparatus is required or an industrial fire brigade member is required to crawl on the ground or floor to stay below smoke and heat.

Front 711

Incipient Stage

Back 711

The early stage of a fire, in which the progression has not developed beyond that which can be extinguished using either portable fire extinguishers or handlines flowing up to 473 L/min (125 gpm).

Front 712

Incipient-Stage Fire

Back 712

A fire that is in the initial or beginning stage and that can be controlled or extinguished by portable extinguishers or small amounts of dry extinguishing agents, without the need for protective clothing or breathing apparatus.

Front 713

Incline Plane

Back 713

A lifting method that provides mechanical advantage by distributing the work required to lift a load over a distance along an incline rather than straight up and down.

Front 714

Incompatible Material

Back 714

A material that, when in contact with an oxidizer, can cause hazardous reactions or can promote or initiate decomposition of the oxidizer.

Front 715

Incompatible Material

Back 715

Materials that, when in contact with each other, have the potential to react in a manner that generates heat, fumes, gases, or by-products that are hazardous to life or property.

Front 716

Incompatible Material

Back 716

Materials that, when in contact with each other, have the potential to react in a manner that generates heat, fumes, gases or by-products that are hazardous to life or property. [5000, 2009]

Front 717

Incompatible Materials

Back 717

Materials that can initiate, catalyze, or accelerate the decomposition of organic peroxide formulations or that can cause hazardous reactions when in contact with such formulations.

Front 718

Incompatible Material(s)

Back 718

Materials that, when in contact with each other and outside of the condition of intended use, have the potential to react in a manner that generates heat, fumes, gases, or by-products that are hazardous to life and property.

Front 719

Incompatible Materials

Back 719

Materials that, when making contact with each other in an upset condition, can react in a manner that generates heat, fumes, gases, or by-products that could cause damage to life or property.

Front 720

Increased Safety “e”

Back 720

Type of protection applied to electrical equipment that does not produce arcs or sparks in normal service and under specified abnormal
conditions, in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks.

Front 721

Independent Service Provider
(ISP)

Back 721

An independent third party utilized by an organization to perform any one or any combination of advanced inspection, advanced cleaning, or repair services.

Front 722

Indeterminate Special
Atmosphere

Back 722

A special atmosphere that contains components that, in their pure state, are flammable but that, in the mixtures used (diluted with nonflammable gases), are not reliably and predictably flammable.

Front 723

Indicating Valve

Back 723

A valve that has components that show if the valve is open or closed. Examples are outside screw and yoke (OS&Y) gate valves and underground gate valves with indicator posts.

Front 724

Indicating Valve

Back 724

A valve that has components that show if the valve is open or closed. Examples are outside screw and yoke (OS&Y) gate valves and underground gate valves with indicator posts. [24, 2007]

Front 725

Indicator

Back 725

A mechanical or electrical device that shows when an extinguishing system or a critical component of it is ready to operate, or if it has already operated.

Front 726

Indicator

Back 726

A mechanical or electrical device that shows when an extinguishing system or critical component of it is ready to operate, or if it has already operated.

Front 727

Indicator

Back 727

A piece of equipment that shows flows or pressure and is monitored periodically, consistent with the requirement of the application.

Front 728

Indirect Attack

Back 728

Fire-fighting operations involving the application of extinguishing agents to reduce the buildup of heat released from a fire without applying the agent directly onto the burning fuel.

Front 729

Indirect Attack

Back 729

Fire-fighting operations involving the application of extinguishing agents to reduce the buildup of heat released from a fire without applying the agent directly onto the burning fuel. [1145, 2006]

Front 730

Indirect Contact

Back 730

Contact of persons with exposed conductive parts that have become live under fault conditions.

Front 731

Indirect Electric Vaporizer

Back 731

An immersion-type vaporizer wherein the electric element heats an interface solution in which the LP-Gas heat exchanger is immersed or heats an intermediate heat sink.

Front 732

Indirect Electric Vaporizer

Back 732

An immersion-type vaporizer wherein the electric element heats an interface solution in which the LP-Gas heat exchanger is immersed or heats an intermediate heat sink. [58, 2008]

Front 733

Indirect-Fired Appliance

Back 733

A fuel-burning appliance in which products of combustion (flue gases) are not mixed in the appliance with the medium (e.g., air) being heated.

Front 734

Indirect-Fired Heating System

Back 734

A heating system in which the products of combustion do not enter the work chamber.

Front 735

Indirect-Fired Internal Heating
System

Back 735

A heating system of gastight radiators containing burners not in contact with the oven atmosphere.

Front 736

Indirect Medical Oversight

Back 736

The administrative medical direction that can be in the form of system design, protocols and procedures, training, and quality assessment.

Front 737

Indirect (or Indirect-Fired) Vaporizer

Back 737

A vaporizer in which heat furnished by steam, hot water, the ground, surrounding air, or other heating medium is applied to a vaporizing chamber or to tubing, pipe coils, or other heat exchange surface containing the liquid LP-Gas to be vaporized; the heating of the medium used is at a point remote from the vaporizer.

Front 738

Indirect (or Indirect-Fired) Vaporizer

Back 738

A vaporizer in which heat furnished by steam, hot water, the ground, surrounding air, or other heating medium is applied to a vaporizing chamber or to tubing, pipe coils, or other heat exchange surface containing the liquid LP-Gas to be vaporized; the heating of the medium used is at a point remote from the vaporizer. [58, 2008]

Front 739

Individual Air Management
Program

Back 739

A program to develop an individual’s awareness of his or her personal air consumption rate while wearing respiratory protection equipment in a work mode.

Front 740

Individual Area of
Specialization

Back 740

The qualifications or functions of a specific job(s) associated with chemicals and/or containers used within an organization.

Front 741

Individual Fuel Package

Back 741

An item or a group of items for which the fire test response characteristics are to be measured.

Front 742

Individual Vent

Back 742

A pipe or anti-siphon trap vent device installed to vent a single fixture drain.

Front 743

Indoor Area

Back 743

An area that is within a building or structure having overhead cover, other than a structure qualifying as “weather protection” in accordance with 6.5.2 of NFPA 55, Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable and Stationary Containers, Cylinders, and Tanks. (See also 3.3.13.9, Outdoor Area.) [55, 2005]

Front 744

Indoor Area

Back 744

An area that is within a building or structure having overhead cover, other than a structure qualifying as “weather protection” in accordance with 6.5.2. (See also 3.3.2.3, Outdoor Area.)

Front 745

Indoor Installation

Back 745

A fuel cell power system completely surrounded and enclosed by walls, a roof, and a floor.

Front 746

Induced Draft (ID) Fan

Back 746

A device used to remove the products of combustion from the boiler or HRSG by introducing a negative pressure differential.

Front 747

Induction Heating, Melting, and Welding

Back 747

The heating, melting, or welding of a nominally conductive material due to its own I2R losses when the material is placed in a varying electromagnetic field.

Front 748

Induction Heating System

Back 748

A system in which heat is generated in a pipeline or vessel wall by inducing current and hysteresis effect in the pipeline or vessel wall from an external isolated ac field source.

Front 749

Induction Heating System

Back 749

A heating system by means of which a current-carrying conductor induces the transfer of electrical energy to the work by eddy currents.

Front 750

Inductive Reasoning

Back 750

The process by which a person starts from a particular experience and proceeds to generalizations. The process by which hypotheses are developed based upon observable or known facts and the training, experience, knowledge, and expertise of the observer.

Front 751

Industrial Control Panel

Back 751

An assembly of two or more components consisting of one of the following: 1) Power circuit components only, such as motor controllers, overload relays, fused disconnect switches and circuit breakers; 2)Control circuit components only, such as pushbuttons, pilot lights, selector switches, timers, switches, control relays; 3) A combination of power and control circuit components.

Front 752

Industrial Fire Brigade

Back 752

An organized group of employees within an industrial occupancy who are knowledgeable, trained, and skilled in at least basic fire-fighting operations, and whose full-time occupation might or might not be the provision of fire suppression and related activities for their employer.

Front 753

Industrial Fire Brigade

Back 753

An organized group of employees within an industrial occupancy who are knowledgeable, trained, and skilled in at least basic fire-fighting operations, and whose full-time occupation might or might not be the provision of fire suppression and related activities for their employer. [600, 2005]

Front 754

Industrial Fire Brigade
Apparatus

Back 754

An industrial fire brigade emergency response vehicle designed and intended primarily for fire suppression, rescue, or other specialized function that includes pumpers, foam apparatus, aerial ladders, rescue vehicles, and other such apparatus.

Front 755

Industrial Fire Brigade
Apparatus

Back 755

An industrial fire brigade emergency response vehicle designed and intended primarily for fire suppression, rescue, or other specialized function that includes pumpers, foam apparatus, aerial ladders, rescue vehicles, and other such apparatus. [600, 2005]

Front 756

Industrial Fire Brigade Leader

Back 756

An individual responsible for overseeing the performance or activity of other members.

Front 757

Industrial Fire Brigade
Management

Back 757

The individual designated by top management to be responsible for the organization, management, and functions of the industrial fire brigade.

Front 758

Industrial Fire Brigade
Management

Back 758

The individual designated by top management to be responsible for the organization, management, and functions of the industrial fire brigade. [600, 2005]

Front 759

Industrial Fire Brigade
Training Coordinator

Back 759

The designated company representative with responsibility for coordinating effective, consistent, and quality training within the industrial fire brigade training and education program.

Front 760

Industrial Fire Brigade
Training Coordinator

Back 760

The designated company representative with responsibility for coordinating effective, consistent, and quality training within the industrial fire brigade training and education program.
[600, 2005]

Front 761

Industrial Fire Department

Back 761

An organization providing rescue, fire suppression, and related activities as well as emergency medical services, hazardous material operations, or other activities that occur at a single facility or facilities under the same management. [1500, 2002]

Front 762

Industrial High-Heat
Appliance

Back 762

An industrial appliance that is larger than 100 ft3 (2.8 m3) in size, excluding blower compartment, fan compartment, and burner equipment, such as a billet or bloom furnace, a blast furnace, a brass melter, a cupola, a glass furnace, an open-hearth furnace, a ceramic kiln, or a vitreous enameling oven for ferrous materials.

Front 763

Industrialized Unit

Back 763

A factory-built structure, designed for either permanent site installation or as a portable unit, and constructed to the requirements of a model building code or other state construction regulations.

Front 764

Industrial Low-Heat Appliance

Back 764

An industrial appliance such as a floor-mounted or suspended-type warm-air furnace that is larger than 100 ft3 (2.8 m3) in size, excluding blower compartment, fan compartment, and burner equipment; a steam boiler that operates at pressures that do not exceed 50 psig (gauge pressure of 345 kPa) and is larger than 100 ft3 (2.8 m3) in size, excluding burner equipment; a water boiler that operates at water temperatures of not more than the temperature of saturated steam at pressures that do not exceed 50 psig (gauge pressure of 345 kPa) and is larger than 100 ft3 (2.8 m3), excluding burner equipment; a floor mounted or suspended type unit heater larger than 100 ft3 (2.8 m3) in size, excluding blower compartment, fan compartment, and burner equipment; a commercial cooking range; a bake oven; a candy furnace; a stereotype furnace; a drying and curing appliance; or any other process appliance in which materials are heated or melted at temperatures (excluding flue gas temperature) that do not exceed 600°F (316°C).

Front 765

Industrial Machinery (Machine)

Back 765

A power-driven machine (or a group of machines working together in a coordinated manner), not portable by hand while working, that is used to process material by cutting; forming; pressure; electrical, thermal, or optical techniques; lamination; or a combination of these processes. It can include associated equipment used to transfer material or tooling, including fixtures, to assemble/disassemble, to inspect or test, or to package. [The associated electrical equipment, including the logic controller(s) and associated software or logic together with the machine actuators and sensors, are considered as part of the industrial machine.]

Front 766

Industrial Machinery
(Machine)

Back 766

A power-driven machine (or a group of machines working together in a coordinated manner), not portable by hand while working, that is used to process material by cutting; forming; pressure; electrical, thermal, or optical techniques; lamination; or a combination of these processes. Machine can include associated equipment used to transfer material or tooling, including fixtures, to assemble/disassemble, to inspect or test, or to package. [The associated electrical equipment, including the logic controller(s) and associated software or logic together with the machine actuators and sensors, are considered as part of the industrial machine.] [70:670.2]

Front 767

Industrial Manufacturing
System

Back 767

A systematic array of one or more industrial machines that is not portable by hand and includes any associated material handling, manipulating, gauging, measuring, or inspection equipment. [70:670.2]

Front 768

Industrial Medium-Heat
Appliance

Back 768

A steam boiler that operates at pressures that exceed 50 psig (gauge pressure of 345 kPa) or an industrial appliance larger than 100 ft3 (2.8 m3) in size, excluding blower compartment, fan compartment, and burner equipment, such as an annealing furnace (glass or metal), a charcoal furnace, a galvanizing furnace, a gas producer, or a commercial or industrial incinerator.

Front 769

Industrial Occupancy

Back 769

An occupancy in which products are manufactured or in which processing, assembling, mixing, packaging, finishing, decorating, or repair operations are conducted.

Front 770

Industrial Occupancy

Back 770

An occupancy in which products are manufactured or in which processing, assembling, mixing, packaging, finishing, decorating, or repair operations are conducted. [101, 2006]

Front 771

Industrial Occupancy

Back 771

An occupancy in which products are manufactured or in which processing, assembling, mixing, packaging, finishing, decorating, or repair operations are conducted. [5000, 2009]

Front 772

Industrial Occupancy

Back 772

An occupancy in which products are manufactured or in which processing, assembling, mixing, packaging, finishing, decorating, or repair operations are conducted. [5000:3.3]

Front 773

Industrial Occupancy

Back 773

Includes factories that manufacture products of all kinds and properties devoted to operations such as processing, assembling, mixing, packaging, finishing or decorating, and repairing.

Front 774

Industrial Occupancy

Back 774

Includes factories that manufacture products of all kinds and properties devoted to operations such as processing, assembling, mixing, packaging, finishing or decorating, and repairing.
[58, 2008]

Front 775

Industrial Occupancy

Back 775

Occupancies that include industrial, commercial, mercantile, warehouse, power plant (utility), and institutional or similar occupancy, including for-profit, not-for-profit, and governmental facilities.

Front 776

Industrial Occupancy

Back 776

An occupancy in which products are manufactured or in which processing, assembling, mixing, packaging, finishing, decorating, or repair operations are conducted. [101:3.3]

Front 777

Industrial Personnel

Back 777

Workers who might be exposed to flash fire.

Front 778

Industrial Sewer

Back 778

A sewer intended to receive only industrial wastewater or other liquid or water-carried wastes. (See also 3.3.54.12, Sanitary Sewer; 3.3.54.13, Storm Sewer; and 3.3.54.4, Combined Sewer.)

Front 779

Industrial Waste

Back 779

Generally liquid, solid, or gaseous wastes originating from the manufacture of specific products.

Front 780

Inert Atmosphere

Back 780

An atmosphere in which combustion cannot occur.

Front 781

Inert Gas

Back 781

A gas that is noncombustible and nonreactive.

Front 782

Inert Gas

Back 782

A gas that is noncombustible and nonreactive. [69:3.3]

Front 783

Inert Gas

Back 783

A nonreactive, nonflammable, noncorrosive gas such as argon, helium, krypton, neon, nitrogen, and xenon.

Front 784

Inert Gas

Back 784

Any gas that is nonflammable, chemically inactive, noncontaminating for the use intended, and oxygen deficient to the extent required. [69, 2002]

Front 785

Inert Gas

Back 785

Any gas that is nonflammable, nonreactive, and noncontaminating.

Front 786

Inert Gas

Back 786

For purposes of tank entry, cleaning, or repair, a gas that is nonflammable, chemically inactive, noncontaminating for the use intended, and oxygen-deficient to the extent required.

Front 787

Inert Gas

Back 787

For purposes of tank entry, cleaning, or repair, a gas that is nonflammable, chemically inactive, noncontaminating for the use intended, and oxygen-deficient to the extent required. [326, 2005]

Front 788

Inert Gas

Back 788

For the purpose of controlling static electric hazards, a
nonflammable, nonreactive gas that renders the combustible material
in a system incapable of supporting combustion.

Front 789

Inert Gas

Back 789

For the purpose of handling releases of flammable and combustible liquids and gases, a gas that is nonflammable, chemically inactive, noncontaminating for the use intended, and oxygen-deficient to the extent required.

Front 790

Inert Gas Agent

Back 790

An agent that contains as primary components one or more of the gases helium, neon, argon, or nitrogen. Inert gas agents that are blends of gases can also contain carbon dioxide as a secondary component.

Front 791

Inerting

Back 791

A technique by which a combustible mixture is rendered nonignitible by adding an inert gas. [69:3.3]

Front 792

Inerting

Back 792

A technique by which a combustible mixture is rendered nonignitible by adding an inert gas or a noncombustible dust. (See also 3.3.1, Blanketing.)

Front 793

Inerting

Back 793

A technique by which a combustible mixture is rendered nonignitible by the addition of an inert gas.

Front 794

Inerting

Back 794

A technique by which the atmosphere in a tank or container is rendered nonignitible or nonreactive by the addition of an inert gas.

Front 795

Inerting

Back 795

For the purpose of handling releases of flammable and combustible liquids and gases, a technique by which the atmosphere of a tank or container is rendered nonignitible or nonreactive by the addition of an inert gas.

Front 796

Inert Special Atmosphere
(Purge Gas)

Back 796

A special atmosphere of nonflammable gases that contains less than
1 percent oxygen.

Front 797

Infection

Back 797

The state or condition in which the body or a part of it is invaded by a pathogenic agent (microorganism or virus) which, under favorable conditions, multiplies and produces effects which are injurious.

Front 798

Infection Control Officer

Back 798

The person or persons within the fire department who are responsible for managing the department infection control program and for coordinating efforts surrounding the investigation of an exposure.

Front 799

Infection Control Program

Back 799

The fire department’s formal policy and implementation of procedures relating to the control of infectious and communicable disease hazards where employees, patients, or the general public
could be exposed to blood, body fluids, or other potentially infectious materials in the fire department work environment.

Front 800

Infection Control Program

Back 800

The fire department’s formal policy and implementation of procedures relating to the control of infectious and communicable disease hazards where employees, patients, or the general public
could be exposed to blood, body fluids, or other potentially infectious materials in the fire department work environment. [1500, 2002]

Front 801

Infection Control Program

Back 801

The fire department’s formal policy and implementation of procedures relating to the control of infectious and communicable disease hazards where employees, patients, or the general public
could be exposed to blood, body fluids, or other potentially infectious materials in the fire department work environment. [1500, 2007]

Front 802

Infectious Disease

Back 802

An illness or disease resulting from invasion of a host by disease- producing organisms such as bacteria, viruses, fungi, or parasites.

Front 803

Infectious Disease

Back 803

An illness or disease resulting from invasion of a host by
disease-producing organisms such as bacteria, viruses, fungi, or parasites.
[1500, 2007]

Front 804

Inflatable Boat (IB)

Back 804

Any boat that achieves and maintains its intended shape and buoyancy through the medium of inflation.

Front 805

Information Technology
Equipment Area

Back 805

An area of a building where the information technology equipment room is located, including support rooms served by the same special
air-conditioning/air-handling equipment as the information technology equipment room.

Front 806

Information Technology
Equipment Room

Back 806

A room within the information technology equipment area that contains the information technology equipment.

Front 807

Information Technology
Equipment System

Back 807

Any electronic digital or analog computer, along with all peripheral, support, memory, programming, or other directly associated equipment, records, storage, and activities.

Front 808

Infrared Heater

Back 808

A heater that directs a substantial amount of its energy output in the form of infrared energy into the area to be heated. Such heaters may be of either the vented or unvented type.

Front 809

Ingredient

Back 809

A chemical used to create a pyrotechnic material.

Front 810

Inhabited Building

Back 810

Any building or structure regularly used in whole or part as a place of human habitation.

Front 811

Inhabited Building

Back 811

Any building or structure regularly used in whole or part as a place of human habitation. [495, 2006]

Front 812

Inherent Flame Resistance

Back 812

Flame resistance that is derived from the essential characteristic of the fiber or polymer.

Front 813

Inherent Flame Resistance

Back 813

Flame resistance that is derived from the essential characteristics of the fiber or polymer.

Front 814

Initial Action

Back 814

The actions taken by those responders first to arrive at an incident site.

Front 815

Initial Action Plan

Back 815

A verbal or written management plan developed by the initial Incident Commander to an incident and upon which initial incident control actions are based.

Front 816

Initial Attack

Back 816

An aggressive suppression action consistent with fire fighter and public safety and values to be protected.

Front 817

Initial Attack

Back 817

Fire-fighting efforts and activities that occur in the time increment between the arrival of the fire department on the scene of a fire and the tactical decision by the Incident Commander that the resources dispatched on the original response will be insufficient to control and extinguish the fire, or that the fire is extinguished.

Front 818

Initial Attack Apparatus

Back 818

Fire apparatus with a fire pump of at least 250 gpm (1000 L/min) capacity, water tank, and hose body whose primary purpose is to initiate a fire suppression attack on structural, vehicular, or vegetation fires, and to support associated fire department operations.

Front 819

Initial Attack Apparatus

Back 819

Fire apparatus with a permanently mounted fire pump of at least 250 gpm (1000 L/min) capacity, water tank, and hose body whose primary purpose is to initiate a fire suppression attack on structural, vehicular, or vegetation fires, and to support associated fire department operations. [1901, 2003]

Front 820

Initial Attack Line

Back 820

The first hose stream placed in service by a company at the scene of a fire in order to protect lives or to prevent further extension of fire while additional lines are laid and placed in position.

Front 821

Initial Full Alarm Assignment

Back 821

Those personnel, equipment, and resources ordinarily dispatched upon notification of a structural fire.

Front 822

Initial Operation

Back 822

The first coordinated operation of the unit.

Front 823

Initial Rapid Intervention
Crew (IRIC)

Back 823

Two members of the initial attack crew who are assigned for rapid deployment to rescue lost or trapped members.

Front 824

Initial Response Team

Back 824

As related to caves, a specific combination of resources with a leader, personnel, and common equipment assembled for the purpose of making initial contact to the patient and initiating patient care in the cave.

Front 825

Initiating Device

Back 825

A system component that originates transmission of a change-of-state condition.

Front 826

Initiating Device

Back 826

A system component that originates transmission of a change-of-state condition, such as in a smoke detector, manual fire alarm box, or supervisory switch. [72, 2002]

Front 827

Initiating Device

Back 827

A system component that originates transmission of a change-of-state condition, such as in a smoke detector, manual fire alarm box, or supervisory switch. (SIG-IDS)

Front 828

Initiating Device

Back 828

A system component that originates transmission of a change-of-state of condition, such as in a smoke detector, manual fire alarm box, or supervisory switch. [72, 2007]

Front 829

Initiating Device Circuit

Back 829

A circuit to which automatic or manual initiating devices are connected where the signal received does not identify the individual device operated. [72, 2007]

Front 830

Initiating Device Circuit

Back 830

A circuit to which automatic or manual initiating devices are connected where the signal received does not identify the individual device operated. (SIG-PRO)

Front 831

Initiative

Back 831

A fire or life safety program that targets a specific issue and audience(s) and is terminated when program goals are achieved.

Front 832

Injection (Bunsen) Type
Burner

Back 832

A burner employing the energy of a jet of gas to inject air for combustion into the burner and mix it with the gas.

Front 833

Injury

Back 833

Physical damage to a person suffered as the result of an incident that requires (or should require) treatment by a practitioner of medicine, a registered EMT, or a paramedic within one year of the incident (regardless of whether treatment was actually received) or that results in at least one day of restricted activity immediately following the incident.

Front 834

In-Line Balanced Pressure
Proportioner

Back 834

This system is similar to a standard balanced pressure system, except the pumped concentrate pressure is maintained at a fixed preset value. Balancing of water and liquid takes place at individual proportioners located in the system riser or in segments of multiple systems.

Front 835

In-Line Balanced Pressure
Proportioning

Back 835

A foam proportioning system utilizing a foam concentrate pump at all design flow rates, the constant pressure of which is greater than the maximum water pressure under all operating conditions.

Front 836

In-Line Eductor

Back 836

A Venturi-type proportioning device that meters foam concentrate at a fixed or variable concentration into the water stream at a point between the water source and a nozzle or other discharge device.

Front 837

In-Line Pump

Back 837

A centrifugal pump whose drive unit is supported by the pump having its suction and discharge flanges on approximately the same centerline.

Front 838

Inner Perimeter

Back 838

That area which is secured to allow effective command, communication, and coordination control and to allow for safe operations to deal with an emergency, including the immediate ingress and egress needs of emergency response personnel and vehicles.

Front 839

Inorganic

Back 839

Being or composed of matter other than hydrocarbons and their derivatives, or matter that is not of plant or animal origin.
[ASTM D 1079: 2.1]

Front 840

Input

Back 840

The terminals where current, voltage, power, or driving force may be applied to a circuit or device; the state or sequence of states occurring on a specific input channel; or the device or collective set of devices used for bringing data into another device.

Front 841

Input Data Specification

Back 841

Information required by the verification method.

Front 842

Input Data Specification

Back 842

Information required by the verification method. [101, 2003]

Front 843

Input Data Specification

Back 843

Information required by the verification method. [101, 2009]

Front 844

Inrush Current (Solenoid)

Back 844

The inrush current of a solenoid is the steady-state current taken from the line at rated voltage and frequency with the plunger blocked in
the rated maximum open position.

Front 845

Inseam Length

Back 845

Lower torso garment measurement along inseam from crotch seam to bottom edge of cuff.

Front 846

In-Service

Back 846

Ready for immediate use.

Front 847

In Service

Back 847

The status of a fire department ground ladder that has been inspected, maintained, and tested and currently is in use or available for use.

Front 848

In Service

Back 848

The status of hose stored in a hose house, on a rack or reel, or on a fire apparatus that is available and ready for immediate use at an incident.

Front 849

In-Service Condition

Back 849

A state or condition of readiness for intended duty; usually an emergency vehicle properly serviced with all equipment properly loaded and ready for immediate response.

Front 850

In-Service Fire Apparatus

Back 850

Any fire apparatus including reserve apparatus that is available for use under emergency conditions to transport personnel and equipment and to support suppression of fires and mitigation of other hazardous conditions.

Front 851

In-Service Utilization Ratio

Back 851

An efficiency ratio that divides the cumulative unit-elapsed intervals by the total time that the unit is on duty.

Front 852

In-Service Weight

Back 852

The maximum actual vehicle weight under any conditions of mobile operation, sometimes referred to as gross vehicle weight.

Front 853

Inside Liquid Storage Area

Back 853

A room or building used for the storage of liquids in containers or portable tanks, separated from other types of occupancies.

Front 854

Inside Liquid Storage Area

Back 854

A room or building used for the storage of liquids in containers or portable tanks, separated from other types of occupancies.
[30, 2008]

Front 855

In Sight From (Within Sight
From, Within Sight)

Back 855

Where this Code specifies that one equipment shall be “in sight from,” “within sight from,” or “within sight of,” and so forth, another equipment, the specified equipment is to be visible and not more than 15 m (50 ft) distant from the other.

Front 856

In Sight From (Within Sight
From, Within Sight)

Back 856

Where this standard specifies that one equipment shall be “in sight from,” “within sight from,” or “within sight,” and so forth, of another equipment, the specified equipment is to be visible and not more than 15 m (50 ft) distant from the other. [70:100]

Front 857

In Situ Combustible

Back 857

Combustible materials that are permanently located in a room or an area (e.g., cable insulation, lubricating oil in pumps).

Front 858

Insole

Back 858

The inner component of the footwear upon which the foot rests.

Front 859

Insole

Back 859

The inner part of the protective footwear upon which the foot rests and that conforms to the bottom of the foot.

Front 860

Inspect

Back 860

To determine the condition or operation of a component(s) by comparing its physical, mechanical, and/or electrical characteristics with established standards, recommendations, and requirements through examination by sight, sound, or feel.
[1915, 2000]

Front 861

Inspected Vessel

Back 861

A vessel operated on the navigable waterways of the United States that is subject to the regulations in 46 CFR, which require it to be certificated and inspected as a passenger ship, cargo ship, oceanographic ship, or tank vessel.

Front 862

Inspection

Back 862

A visible examination of a system or portion thereof to verify that it appears to be in operating condition and is free of physical damage. [820, 2008]

Front 863

Inspection

Back 863

A visual examination of a system or portion thereof to verify that it appears to be in operating condition and free of physical damage. [820, 2003]

Front 864

Inspection

Back 864

A visual examination of a system or portion thereof to verify that it appears to be in operating condition and is free of physical damage.

Front 865

Inspection

Back 865

A visual examination of a system or portion thereof to verify that it appears to be in operating condition and is free of physical damage. [820, 2008]

Front 866

Inspect(ion)

Back 866

To determine the condition or operation of a component(s) by comparing its physical, mechanical, and/or electrical characteristics with established standards, recommendations, and requirements through examination by sight, sound, or feel.

Front 867

Inspection Agent

Back 867

A qualified company or individual assigned to execute the tests and special inspections required by the quality assurance program.

Front 868

Inspection, Testing, and
Maintenance Service

Back 868

A service program provided by a qualified contractor or qualified property owner’s representative in which all components unique to the property’s systems are inspected and tested at the required times and necessary maintenance is provided. This program includes logging and retention of relevant records.

Front 869

Instability

Back 869

A condition of a mobile unit in which the sum of the moments
tending to overturn the unit exceeds the sum of the moments tending
to resist overturning.

Front 870

Instability

Back 870

A condition of a mobile unit in which the sum of the moments
tending to overturn the unit exceeds the sum of the moments tending
to resist overturning. [1901, 2003]

Front 871

Installation

Back 871

Assembly, at the site of occupancy, of all portions of the manufactured home, connection of the home to existing utility connections, and installation of support and anchoring systems.

Front 872

Installation

Back 872

A system that includes natural gas or hydrogen containers, pressure booster, compressors, vaporizers, and all attached valves, piping, and appurtenances.

Front 873

Installation

Back 873

The complete setting-in-place and readying for operation of an oil-burning appliance and its accessories and equipment.

Front 874

Installation

Back 874

The location where a fuel cell power system is sited as a unit or built as an assembly.

Front 875

Installation Alteration

Back 875

The replacement, addition, modification, or removal of any components of the required ground support or anchoring systems.

Front 876

Installation Instructions

Back 876

Instructions provided by the manufacturer that accompany each manufactured home and detail the manufacturer’s requirements for ground support, anchoring systems, and other work completed on site.

Front 877

Installation Orientation

Back 877

The following sprinklers are defined according to orientation.

Front 878

Installed Total Impulse

Back 878

The combined total impulse of all rocket motors installed in a rocket and intended to be ignited during the launch and flight of the rocket.

Front 879

Installed Total Impulse

Back 879

The combined total impulses of all rocket motors installed in a rocket and intended to be ignited during the launch and flight of the rocket.

Front 880

Instant Recall Recorder

Back 880

A device that records voice conversations and provides a telecommunicator with a means to review such conversations in real time.

Front 881

Institutional Sprinkler

Back 881

A sprinkler specially designed for resistance to load-bearing purposes and with components not readily converted for use as weapons.

Front 882

In Storage

Back 882

The status of hose not readily available for use because it is not at the scene of an incident and not loaded on a vehicle that can transport it to the scene.

Front 883

Instructional Laboratory Unit

Back 883

A laboratory unit used for education past the 12th grade and before post-college graduate level instruction for the purposes of instruction of six or more persons for four or more hours per day or more than
12 hours per week. Experiments and tests conducted in instructional laboratory units are under the direct supervision of an instructor. Laboratory units used for graduate or post-graduate research are not to be considered instructional laboratory units.

Front 884

Instruction Plate

Back 884

A visual indication whether in pictorial or word format that provides instruction to the operator in the use of a component on the apparatus.

Front 885

Instructor

Back 885

An individual deemed qualified by the authority having jurisdiction to deliver training in the operation of fire service vehicles.

Front 886

Instructor

Back 886

An individual qualified by the authority having jurisdiction to deliver fire fighter training, who has the training and experience to supervise students during live fire training evolutions.

Front 887

Instructor I

Back 887

A fire service instructor who has demonstrated the knowledge and ability to deliver instruction effectively from a prepared lesson plan, including instructional aids and evaluation instruments; adapt lesson plans to the unique requirements of the students and authority having jurisdiction; organize the learning environment so that learning is maximized; and meet the record-keeping requirements of authority having jurisdiction.

Front 888

Instructor II

Back 888

A fire service instructor who, in addition to meeting Instructor I qualifications, has demonstrated the knowledge and ability to develop individual lesson plans for a specific topic including learning objectives, instructional aids, and evaluation instruments; schedule training sessions based on overall training plan of authority having jurisdiction; and supervise and coordinate the activities of other instructors.

Front 889

Instructor III

Back 889

A fire service instructor who, in addition to meeting Instructor II qualifications, has demonstrated the knowledge and ability to develop comprehensive training curricula and programs for use by single or multiple organizations; conduct organization needs analysis; and develop training goals and implementation strategies.

Front 890

Instructor-in-Charge

Back 890

An individual qualified as an instructor and designated by the authority having jurisdiction to be in charge of the live fire training evolution.

Front 891

Instrument Air

Back 891

For the purposes of this standard, instrument air is air intended for
the powering of medical devices unrelated to human respiration (e.g.,
surgical tools, ceiling arms). Medical air and instrument air are
distinct systems for mutually exclusive applications. Instrument air is a
medical support gas that falls under the general requirements for
medical gases. (PIP)

Front 892

Insulated

Back 892

Refers to equipment, structures, or vessels provided with an encapsulating material that, for the expected duration of fire exposure, will limit steel temperatures to a maximum of 850°F (454°C) for structural members or 650°F (343°C) for vessels. The insulation system shall be: (1) Noncombustible and fire retardant; (2) Mildew and weather resistant; (3) Resistant to the force of hose streams; and (4) Secured by fire and corrosion-resistant fastenings.

Front 893

Insulated

Back 893

Separated from other conducting surfaces by a dielectric (including air space) offering a high resistance to the passage of current.

Front 894

Insulating End

Back 894

An insulator designed to electrically insulate the end of a Type FCC
cable.

Front 895

Insulating Millboard

Back 895

A factory fabricated board formed with noncombustible materials, normally fibers, and having a thermal conductivity in the range of 1
Btu/in./ft2/°F/hr (0.14 W/m/°K).

Front 896

Insulating RIBC

Back 896

An RIBC constructed entirely of solid plastic or solid plastic and foam composite that cannot be electrically grounded.

Front 897

Insulating RIBC

Back 897

An RIBC constructed entirely of solid plastic or solid plastic and foam composite that cannot be electrically grounded. [654, 2006]

Front 898

Insurance

Back 898

Transfer by contract of funds (premium) in exchange for payment on losses that might occur.

Front 899

Intake

Back 899

The process of collecting the comprehensive background information for the juvenile and family regarding the incident(s) that brought the juvenile to the program.

Front 900

Intake Connection Size

Back 900

The nominal size of the first fire hose connection from the pump on an intake.

Front 901

Intake Connection Size

Back 901

The nominal size of the first fire hose connection from the pump on an intake. [1901, 2003]

Front 902

Intake Pressure

Back 902

The pressure on the intake passageway of the pump at the point of gauge attachment.

Front 903

Intake Relief Valve

Back 903

A relief valve piped to the intake manifold of a pump and designed to automatically relieve excessive pressure from the incoming flow of water by discharging water to the environment.

Front 904

Integral 2 psi Service
Regulator

Back 904

A pressure regulator for LP-Gas vapor service that combines a
high-pressure regulator and a 2 psi service regulator into a single unit.

Front 905

Integral Fuel Tank

Back 905

A fuel container whose boundary composition is as close to 100 percent of the primary structure as possible.

Front 906

Integral Fuel Tank in EPS Systems

Back 906

A fuel tank furnished by the EPS supplier and mounted on the engine or under as a subbase.

Front 907

Integral Gas Valve Type
Thermostat

Back 907

An automatic device, actuated by temperature changes, designed to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits and in which the thermal actuating element is an integral part of the device: (1) graduating thermostat, a thermostat in which the motion of the valve is
approximately in direct proportion to the effective motion of the thermal element induced by temperature change; (2) snap-acting thermostat, a thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vice versa.

Front 908

Integral Heated Vaporizer

Back 908

A heated vaporizer in which the heat source is integral to the actual vaporizing exchanger (including submerged combustion vaporizers).

Front 909

Integral Heated Vaporizer

Back 909

A vaporizer, including submerged combustion vaporizers, in which the heat source is integral to the actual vaporizing exchanger.

Front 910

Integral Liquid or Salt Media
Quench-Type Tank

Back 910

A quench-type tank connected to the furnace so that the work is under a protective atmosphere from the time it leaves the heating zone until it enters the tank containing a combustible, noncombustible, or salt quench medium.

Front 911

Integral Mortar

Back 911

A preloaded mortar containing pyrotechnic materials and intended for a single firing only.

Front 912

Integral Two-Stage Regulator

Back 912

A pressure regulator for LP-Gas vapor service that combines a
high-pressure regulator and a second-stage regulator into a single unit.

Front 913

Integrated Gas Spacer Cable, Type IGS

Back 913

A factory assembly of one or more conductors, each individually insulated and enclosed in a loose fit, nonmetallic flexible conduit as an integrated gas spacer cable rated 0 through 600 volts.

Front 914

Integrated Heating System

Back 914

A complete system consisting of components such as pipelines, vessels, heating elements, heat transfer medium, thermal insulation, moisture barrier, nonheating leads, temperature controllers, safety signs, junction boxes, raceways, and fittings.

Front 915

Integrated PASS

Back 915

A removable or nonremovable PASS that is an integral part of another item or items of protective clothing, protective equipment, or both.

Front 916

Integrated System

Back 916

A control unit that includes other types of systems in addition to the electronic premises security system.

Front 917

Integrity

Back 917

The ability of an ensemble or ensemble element to remain intact and provide continued minimum performance.

Front 918

Intelligence Function

Back 918

The analysis and sharing of national security and other types of classified information as well as other operational information such as risk assessments, medical surveillance, weather information geospatial data, structural designs, toxic contaminants levels, and utilities and public works data.

Front 919

Intelligent Transportation
System

Back 919

A means of electronic communications or information processing used singly or in combination to improve the efficiency or safety of a surface transportation system.

Front 920

Intended Airport Service

Back 920

All aspects of aircraft rescue and fire-fighting services as provided by this standard.

Front 921

Intended Personnel

Back 921

People working in the animal housing facility with an intimate knowledge of the layout of the building or structure and the general behavior of the animals at the facility, such as employees or students, who are not considered the general public.

Front 922

Interactive System

Back 922

A fuel cell system that operates in parallel with and may deliver power to an electrical production and distribution network. For the purpose of this definition, an energy storage subsystem of a fuel cell system, such as a battery, is not another electrical production source.

Front 923

Interactive System

Back 923

An electric power production system that is operating in parallel with and capable of delivering energy to an electric primary source supply system.

Front 924

Interactive System

Back 924

A solar photovoltaic system that operates in parallel with and may deliver power to an electrical production and distribution network. For the purpose of this definition, an energy storage subsystem of a solar photovoltaic system, such as a battery, is not another electrical production source.

Front 925

Interagency Network

Back 925

A group of agencies (public safety, social services, education, mental health, health care providers, law enforcement, and juvenile justice) working in a formal/informal partnership to address juvenile firesetting.

Front 926

Interaxle Clearance Angle
(Ramp Angle)

Back 926

The measure of the ability of a fully loaded vehicle to negotiate a ramp without encountering interference between the vehicle and the ramp between any two axles.

Front 927

Interaxle Differential

Back 927

A differential in the line of drive between any two axles.

Front 928

Interbarrier Space

Back 928

That space between a primary and secondary barrier, whether or not completely or partially occupied by insulation or other material.

Front 929

Intercell and Interrow
Connection

Back 929

Connections made between rows of cells or at the positive and negative terminals of the battery that might include lead-plated terminal plates, cables with lead, plated lugs, and lead-plated rigid copper connectors, and for nickel-cadmium cells, nickel-plated copper intercell connections.

Front 930

Intercell Connector Safety
Cover

Back 930

Insulated cover to shroud the terminals and intercell connectors from inadvertent contact by personnel or accidental short circuiting.

Front 931

Interceptor Sewer

Back 931

A sewer that receives dry-weather flow and frequently additional predetermined quantities of storm water (if from a combined system) from a number of transverse sewers or outlets and conducts such water to a point for treatment or disposal; also called main sewer.

Front 932

Interconnected

Back 932

Mutually assembled to another component in such a manner that the operation of one directly affects the other or that the contents of one specific duct system are allowed to encounter or contact the products being moved by another duct system.

Front 933

Interconnecting Cables

Back 933

Signal and power cables for operation and control of a system.

Front 934

Interested Party

Back 934

Any person, entity, or organization, including their representatives, with statutory obligations or whose legal rights or interests may be affected by the investigation of a specific incident.

Front 935

Interface

Back 935

That place at which independent systems meet and act on or communicate with each other.

Front 936

Interface Area

Back 936

An area of the body where the protective garments, helmet, gloves, footwear, or SCBA facepiece meet. Interface areas include, but are not limited to, the coat/helmet/SCBA facepiece area; the coat/trouser area; the coat/glove area; and the trouser/footwear area.

Front 937

Interface Component

Back 937

Any material, part, or subassembly used in the construction of the compliant product that provides limited protection to interface areas.

Front 938

Interface Component(s)

Back 938

Any material, part, or subassembly used in the construction of the compliant product that provides limited protection to interface areas.

Front 939

Intergranular Corrosion

Back 939

A corrosive attack on metal at the grain boundary.

Front 940

Interharmonics

Back 940

Not all frequencies that occur on an electrical power system are integer multiples of the fundamental frequency (usually 60 Hz), as are harmonics. Some loads draw currents that result in voltages that are between harmonic frequencies or less than the fundamental frequency. These frequencies are referred to as interharmonics and can be made of discrete frequencies or as a wide-band spectrum. A special category of these interharmonics is called subharmonics, in which the frequencies involved are less than the fundamental power line frequency.

Front 941

Interior

Back 941

A sheltered location not exposed to the environment.

Front 942

Interior Ceiling Finish

Back 942

The interior finish of ceilings.

Front 943

Interior Ceiling Finish

Back 943

The interior finish of ceilings. [101, 2009]

Front 944

Interior Cleaning

Back 944

The removal of soil from flight deck and cabin areas.

Front 945

Interior Finish

Back 945

For recreational vehicles, the exposed interior surface in combination with the substrate to which it is applied.

Front 946

Interior Finish

Back 946

The exposed interior surfaces of buildings including, but not limited to, fixed or movable walls and partitions, columns, and ceilings. Interior finish materials are grouped as Class A Interior Finish and Class B Interior Finish.

Front 947

Interior Finish

Back 947

The exposed surfaces of walls, ceilings, and floors within buildings.

Front 948

Interior Finish

Back 948

The exposed surfaces of walls, ceilings, and floors within buildings. [101, 2009]

Front 949

Interior Finish

Back 949

The exposed surfaces of walls, ceilings, and floors within buildings. [5000, 2003]

Front 950

Interior Finish

Back 950

The exposed surfaces of walls, ceilings, and floors within buildings. [5000, 2009]

Front 951

Interior Floor Finish

Back 951

The interior finish of floors, ramps, stair treads and risers, and other walking surfaces.

Front 952

Interior Floor Finish

Back 952

The interior finish of floors, ramps, stair treads and risers, and other walking surfaces. [101, 2009]

Front 953

Interior Structural Fire
Fighting

Back 953

The physical activity of fire suppression, rescue, or both, inside of buildings or enclosed structures that are involved in a fire beyond the incipient stage.

Front 954

Interior Structural Fire
Fighting

Back 954

The physical activity of fire suppression, rescue, or both, inside of buildings or enclosed structures that are involved in a fire situation beyond the incipient stage. [600, 2005]

Front 955

Interior Surface

Back 955

A surface other than a weather-exposed surface.

Front 956

Interior Wall Finish

Back 956

The interior finish of columns, fixed or movable walls, and fixed or movable partitions.

Front 957

Interior Wall Finish

Back 957

The interior finish of columns, fixed or movable walls, and fixed or movable partitions. [101, 2009]

Front 958

Interlining

Back 958

Any textile that is incorporated into any garment as a layer between the outer and inner layers.

Front 959

Interlining

Back 959

Any textile that is intended for incorporation into any article of wearing apparel as a layer between outer and inner layers.

Front 960

Interlining

Back 960

Any textile that is intended for incorporation into any article of wearing apparel as a layer between outer and inner layers. [1975, 2004]

Front 961

Interlock

Back 961

A device, or an arrangement of devices, in which the operation of one part or one mechanism of the device or arrangement controls the operation of another part of another mechanism.

Front 962

Interlock

Back 962

A device or arrangement by means of which the functioning of one part is controlled by the functioning of another.

Front 963

Interlock

Back 963

A device or arrangement by means of which the functioning of one part is controlled by the functioning of another. [1901, 2003]

Front 964

Interlock (for safeguarding)

Back 964

An arrangement that interconnects guard(s) or device(s) with the control system or all or part of the electrical energy distributed to the machine.

Front 965

Intermagazine Distance (IMD)

Back 965

The minimum separation distance between magazines.

Front 966

Intermediate Bulk Container

Back 966

Any closed vessel having a liquid capacity not exceeding 3000 L (793 gal) and intended for storing and transporting liquids, as defined in Title 49, Code of Federal Regulations, Parts 100 through 199 or in Part 6 of the United Nations’ Recommendations on the Transport of Dangerous Goods.

Front 967

Intermediate Bulk Container

Back 967

Any closed vessel having a liquid capacity not exceeding 3000 L (793 gal) and intended for storing and transporting liquids, as defined in Title 49, Code of Federal Regulations, Parts 100 through 199 or in Part 6 of the United Nations Recommendations on the Transport of Dangerous Goods. [30, 2008]

Front 968

Intermediate Level Sprinkler/Rack Storage Sprinkler

Back 968

A sprinkler equipped with integral shields to protect its operating elements from the discharge of sprinklers installed at higher elevations.

Front 969

Intermediate Metal Conduit
(IMC)

Back 969

A steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings.

Front 970

Intermediate Metal Conduit
(IMC)

Back 970

A steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables when installed with its integral or associated coupling and appropriate fittings.

Front 971

Intermediate Pressure System

Back 971

A water mist system where the distribution system piping is exposed to pressures greater than 12.1 bar (175 psi) but less than 34.5 bar (500 psi).

Front 972

Intermittent Duty

Back 972

Operation for alternate intervals of (1) load and no load; (2) load and rest; and (3) load, no load, and rest.

Front 973

Intermittent Pilot

Back 973

A pilot that burns during light-off and while the main burner is firing.

Front 974

Intermittent Positive-Pressure
Breathing (IPPB)

Back 974

Ventilation of the lungs by application of intermittent positive pressure to the airway. (GAS)

Front 975

Internal Combustion Engine

Back 975

Any engine in which the working medium consists of the products of combustion of the air and fuel supplied. This combustion usually is effected within the working cylinder but can take place in an external chamber.

Front 976

Internal Excess-Flow Valve

Back 976

An excess-flow valve constructed and installed so that damage to valve parts exterior to the container does not prevent closing of the valve.

Front 977

Internally Illuminated

Back 977

Refers to an illumination source that is contained inside the device or legend that is illuminated.

Front 978

Internal Spring-Type Pressure
Relief Valve

Back 978

A pressure relief valve, for use on ASME stationary containers, that has a low profile and is similar to a full internal relief valve except the wrenching pads and seating section are above the container connection. The adjusting spring and the stem are below the seat and are not exposed to the atmosphere.

Front 979

Internal Valve

Back 979

A container primary shutoff valve having the following features: (1) The seat and seat disc remain inside the container so that damage to parts exterior to the container or mating flange does not prevent effective sealing of the valve; (2) The valve is designed for the addition of a means for remote closure and is also designed for automatic shutoff when the flow through the valve exceeds its maximum rated flow capacity or when pump actuation differential pressure drops to a predetermined point.

Front 980

Internal Valve

Back 980

A container primary shutoff valve having the following features: (1) The seat and seat disc remain inside the container so that damage to parts exterior to the container or mating flange does not prevent effective sealing of the valve; (2) the valve is designed for the addition of a means for remote closure and is also designed for automatic shutoff when the flow through the valve exceeds its maximum rated flow capacity or when pump actuation differential pressure drops to a predetermined point. [58, 2008]

Front 981

International Air Transport
Association (IATA)

Back 981

An international group composed of the major airlines of the world that reviews aviation policy including safety items.

Front 982

International Civil Aviation
Organization (ICAO)

Back 982

An international aviation body, operating under the auspices of the United Nations, that produces technical safety documents for civil air transport.

Front 983

International Civil Aviation
Organization (ICAO)

Back 983

An international body charged with matters dealing with the development, coordination, and preservation of international civil aviation.

Front 984

International Shore
Connection

Back 984

A universal connection to the vessel’s fire main to which a shoreside fire-fighting water supply can be connected.

Front 985

International Shore
Connection

Back 985

A universal connection to the vessel’s fire main to which a shoreside fire-fighting water supply can be connected.

Front 986

Interrupted Pilot

Back 986

A pilot that is ignited and burns during light-off and is automatically shut off at the end of the trial-for-ignition period of the main burner(s).

Front 987

Interrupter Switch

Back 987

A switch capable of making, carrying, and interrupting specified currents.

Front 988

Interrupting Rating

Back 988

The highest current at rated voltage that a device is intended to interrupt under standard test conditions.

Front 989

Interrupting Rating

Back 989

The highest current at rated voltage that a device is intended to interrupt under standard test conditions. [70:100]

Front 990

Interrupting Rating

Back 990

The highest current at rated voltage that a device is intended to interrupt under standard test conditions. [70, 2008]

Front 991

Intersecting Trench

Back 991

A trench where multiple trench cuts or legs converge at a single point.

Front 992

Intervention

Back 992

A formal response to firesetting behavior that includes assessment, education, referral, counseling, medical services, social services, and juvenile justice sanctions.

Front 993

Interview

Back 993

The process of meeting with the juvenile firesetter and the family to determine the severity of the problem.

Front 994

Interview Ends

Back 994

The time that the PSAP telecommunicator completes the interview with the caller. This time stamp can occur before or after resources are identified, or before or after units arrive on the scene.

Front 995

Intraline Distance (ILD) or
Intraplant Distance (IPD)

Back 995

The distance to be maintained between any two operating buildings on an explosives manufacturing site, at least one of which contains or is designed to contain explosives; the distance between a magazine and an operating building.

Front 996

Intrinsically Safe

Back 996

As applied to equipment and wiring, equipment and wiring that are incapable of releasing sufficient electrical energy under normal or abnormal conditions to cause ignition of a hazardous atmospheric mixture. [99, 2005 (HYP)]

Front 997

Intrinsically Safe

Back 997

As applied to equipment and wiring, equipment and wiring that are incapable of releasing sufficient electrical energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture. [99, 2005]

Front 998

Intrinsically Safe

Back 998

As applied to equipment and wiring, equipment and wiring that are incapable of releasing sufficient electrical energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture. [99:3.3]

Front 999

Intrinsically Safe

Back 999

As applied to equipment and wiring, equipment and wiring that are incapable of releasing sufficient electrical energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture. (HYP)

Front 1000

Intrinsically Safe Apparatus

Back 1000

Apparatus in which all the circuits are intrinsically safe.

Front 1001

Intrinsically Safe Circuit

Back 1001

A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions.

Front 1002

Intrinsically Safe System

Back 1002

An assembly of interconnected intrinsically safe apparatus, associated apparatus, and interconnecting cables, in that those parts of the system that may be used in hazardous (classified) locations are intrinsically safe circuits.

Front 1003

Intrinsic Safety “i”

Back 1003

Type of protection where any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions.

Front 1004

Intrusion Detection

Back 1004

The ability to detect the entry or attempted entry of a person or vehicle into a protected area.

Front 1005

Intrusion Detection System

Back 1005

A system designed to detect the entry or attempted entry of a person or vehicle into a protected area.

Front 1006

In Use

Back 1006

The status of hose that has actually been deployed at an incident or during training whether or not water is running through the hose.

Front 1007

Invasive Procedure

Back 1007

Any procedure that penetrates the protective surfaces of a patient’s body (i.e., skin, mucous membrane, cornea) and that is performed with an aseptic field (procedural site). [Not included in this category are placement of peripheral intravenous needles or catheters used to administer fluids and/or medications, gastrointestinal endoscopies (i.e., sigmoidoscopies), insertion of urethral catheters, and other similar procedures.] (ELS)

Front 1008

Inverter

Back 1008

Equipment that is used to change voltage level or waveform, or both, of electrical energy. Commonly, an inverter [also known as a power conditioning unit (PCU) or power conversion system (PCS)] is a device that changes dc input to an ac output. Inverters may also function as battery chargers that use alternating current from another source and convert it into direct current for charging batteries.

Front 1009

Inverter Input Circuit

Back 1009

Conductors between the inverter and the battery in stand-alone systems or the conductors between the inverter and the photovoltaic output circuits for electrical production and distribution network.

Front 1010

Inverter Output Circuit

Back 1010

Conductors between the inverter and an ac panelboard for
stand-alone systems or the conductors between the inverter and the
service equipment or another electric power production source, such
as a utility, for electrical production and distribution network.

Front 1011

Investigation

Back 1011

A systematic inquiry or examination. [1033, 2003]

Front 1012

Investigation Site

Back 1012

For the purpose of Chapter 27, the terms “site” and “scene” will be jointly referred to as the “investigation site,” unless the particular context requires the use of one or the other word.

Front 1013

Investigative Team

Back 1013

A group of individuals working on behalf of an interested party to conduct an investigation into the incident.

Front 1014

Investigator’s Special Tools

Back 1014

Tools of a specialized or unique nature that might not be required for every fire investigation.

Front 1015

Ionization Smoke Detection

Back 1015

The principle of using a small amount of radioactive material to ionize the air between two differentially charged electrodes to sense the presence of smoke particles. Smoke particles entering the ionization volume decrease the conductance of the air by reducing ion mobility. The reduced conductance signal is processed and used to convey an alarm condition when it meets preset criteria. (SIG-IDS)

Front 1016

Ionizing Radiation

Back 1016

Extremely short-wavelength, high energy penetrating rays of alpha, beta, gamma and x-rays emitted from radioactive elements and isotopes (radionuclides).

Front 1017

Ionizing Radiation

Back 1017

Extremely short-wavelength, high energy penetrating rays of gamma and x-rays emitted from radioactive elements and isotopes.

Front 1018

Ionizing Radiation

Back 1018

Radiation of sufficient energy to alter the atomic structure of materials or cells with which it interacts, including electromagnetic radiation such as x-rays, gamma rays, and microwaves and particulate radiation such as alpha and beta particles.

Front 1019

Ironing

Back 1019

Damage in the form of wear or indentations caused to the bottom of the aerial device base rail material by misalignment or malfunction of the rollers or slides.

Front 1020

Irradiance

Back 1020

The power of a laser divided by the area of the laser beam at the target surface, expressed in watts per centimeters squared (W/cm2).

Front 1021

Irrigation Machine

Back 1021

An electrically driven or controlled machine, with one or more motors, not hand-portable, and used primarily to transport and distribute water for agricultural purposes.

Front 1022

Irritant Gas

Back 1022

A chemical that is not corrosive, but that causes a reversible inflammatory effect on living tissue by chemical action at the site of contact. A chemical is a skin irritant if, when tested on the intact skin of albino rabbits by the methods of 16 CFR 1500.41, for an exposure
of 4 or more hours or by other appropriate techniques, it results in an empirical score of 5 or more. A chemical is classified as an eye irritant if so determined under the procedure listed in 16 CFR 1500.42, or other appropriate techniques.

Front 1023

Irritant Gas

Back 1023

A chemical that is not corrosive, but that causes a reversible inflammatory effect on living tissue by chemical action at the site of contact. A chemical is a skin irritant if, when tested on the intact skin of albino rabbits by the methods of 16 CFR 1500.41, for an exposure
of 4 or more hours or by other appropriate techniques, it results in an empirical score of 5 or more. A chemical is classified as an eye irritant if so determined under the procedure listed in 16 CFR 1500.42, or other appropriate techniques. [55, 2005]

Front 1024

Isochar

Back 1024

A line on a diagram connecting points of equal char depth.

Front 1025

Isolated (as applied to location)

Back 1025

Not readily accessible to persons unless special means for access are used. [70, 2008]

Front 1026

Isolated
Equipment-Grounding
Conductor

Back 1026

An insulated equipment-grounding conductor that has one intentional connection to the equipment-grounding system. The isolated equipment-grounding conductor is typically connected to an equipment-grounding terminal either in the facility’s service enclosure or in the first applicable enclosure of a separately derived system. The isolated equipment-grounding conductor should be connected to the equipment-grounding system within the circuits’ derived system.

Front 1027

Isolated Patient Lead

Back 1027

A patient lead whose impedance to ground or to a power line is sufficiently high that connecting the lead to ground, or to either conductor of the power line, results in current flow below a hazardous limit in the lead. (ELE)

Front 1028

Isolated Power Supply

Back 1028

An ungrounded power supply that provides electricity, in which both output wires are isolated from ground.

Front 1029

Isolated Power System

Back 1029

A system comprising an isolating transformer or its equivalent, a line isolation monitor, and its ungrounded circuit conductors.

Front 1030

Isolated Power System

Back 1030

A system comprising an isolating transformer or its equivalent, a line isolation monitor, and its ungrounded circuit conductors. (ELS)

Front 1031

Isolated Storage

Back 1031

Storage in a different storage room or in a separate and detached building located at a safe distance.

Front 1032

Isolating Switch

Back 1032

A switch intended for isolating an electric circuit from its source of power. It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means.

Front 1033

Isolation

Back 1033

A means of preventing certain stream properties from being conveyed past a predefined point.

Front 1034

Isolation

Back 1034

The process by which an area is rendered safe through mitigation of dangerous energy forms.

Front 1035

Isolation System

Back 1035

An arrangement of devices, including isolation devices, applied with specific techniques, that collectively serve to isolate a victim of a trench or excavation emergency from the surrounding product (e.g., soil, gravel, sand).

Front 1036

Isolation System (or Isolation
Devices)

Back 1036

An arrangement of devices, applied with specific techniques, that collectively serve to isolate a victim of a trench or excavation emergency from the surrounding product (e.g., soil, gravel, or sand).

Front 1037

Isolation Transformer

Back 1037

A transformer installed in the shore power supply circuit of a boat to isolate electrically all ac system conductors, including the ac grounding conductor (green, or green with yellow stripe) on the boat, from the ac system conductors of the shore power supply.

Front 1038

Isolation Transformer

Back 1038

A transformer of the multiple-winding type, with the primary and secondary windings physically separated, that inductively couples its ungrounded secondary winding to the grounded feeder system that energizes its primary winding. (ELS)

Front 1039

Isolation Transformer

Back 1039

A transformer of the multiple-winding type, with the primary and secondary windings physically separated, which inductively couples its secondary winding to the grounded feeder systems that energize its primary winding.

Front 1040

ISO Module

Back 1040

An assembly of tanks or tubular cylinders permanently mounted in a frame conforming to International Organization for Standardization (ISO) requirements.

Front 1041

Isotope

Back 1041

Any of two or more forms of an element having the same atomic number and similar chemical properties but differing in mass number and radioactive behavior.

Front 1042

Item

Back 1042

A single combustible object within the compartment that is permanent or transient, movable, or fixed.

Front 1043

Jacob’s Ladder

Back 1043

A rope or chain ladder with rigid rungs.

Front 1044

Jet Blast

Back 1044

The thrust-producing exhaust from a jet engine.

Front 1045

Jet Drive

Back 1045

A propulsion unit that generates thrust in reaction to a water stream.

Front 1046

Job

Back 1046

An organized segment of instruction designed to develop sensory motor skills or technical knowledge.

Front 1047

Job Performance Requirement

Back 1047

A statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task.

Front 1048

Job Performance Requirement

Back 1048

A statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task. [1000, 2006]

Front 1049

Job Performance Requirement

Back 1049

A written statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task. [1000, 2006]

Front 1050

Job Performance Requirement
(JPR)

Back 1050

A statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task. [1000, 2000]

Front 1051

Job Performance Requirement
(JPR)

Back 1051

A statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task. [1000, 2006]

Front 1052

Job Performance Requirement
(JPR)

Back 1052

A written statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task.

Front 1053

Job Performance Requirement
(JPR)

Back 1053

A written statement that describes a specific job task, lists the items necessary to complete the task, and defines measurable or observable outcomes and evaluation areas for the specific task. [1000, 2006]

Front 1054

Job Shadowing

Back 1054

Witnessing firsthand the work environment, employability, and occupational skills in practice, the value of professional training, and potential career options. Job shadowing is designed to increase career awareness, help model expected work behavior through competent examples, and reinforce the link between training, education, and work requirements.

Front 1055

Jogging (Inching)

Back 1055

The quickly repeated closure of the circuit to start a motor from rest for the purpose of accomplishing small movements of the driven machine.

Front 1056

Joiner Construction

Back 1056

Nonstructural partitions used to subdivide compartments, such as bulkhead panels, doors, windows, insulation, ceilings, connectors, and interior finishes.

Front 1057

Joint

Back 1057

A linear opening in or between adjacent assemblies that is designed to allow independent movement of the building.

Front 1058

Joint Aviation Authority (JAA)

Back 1058

An agency in Europe charged with the responsibility of regulating safety in civil aviation.

Front 1059

Joule

Back 1059

The preferred SI unit of heat, energy, or work. A joule is the heat produced when one ampere is passed through a resistance of one ohm for one second, or it is the work required to have a distance of one meter against a force of one newton. There are 4.184 joules in a calorie, and 1055 joules in a British thermal unit (Btu). A watt is a joule/second. [921, 2008]

Front 1060

Joule

Back 1060

The preferred SI unit of heat, energy, or work. A joule is the heat produced when one ampere is passed through a resistance of one ohm for one second, or it is the work required to have a distance of one meter against a force of one newton. There are 4.184 joules in a calorie, and 1055 joules in a British thermal unit (Btu). A watt is a joule/second. (See also 3.3.19, British Thermal Unit (Btu), and 3.3.21, Calorie.)

Front 1061

JP4

Back 1061

A light, volatile fuel with a boiling point between gasoline and light distillate. Its properties are defined in MIL-T-5624, Turbine Fuel, Aviation, Grade JP4, JP5, and JP5/JP8 ST, and are similar to ASTM D
1655, Standard Specification for Aviation Turbine Fuels (Jet B), and ASTM D 2880, Standard Specification for Gas Turbine Fuel Oils.

Front 1062

“J” Turn Test

Back 1062

The measure of a vehicle’s ability to traverse a 90 degree turn at a prescribed speed.

Front 1063

Jurisdiction

Back 1063

A governmental, corporate, contractual, or other legally defined boundary.

Front 1064

Jurisdiction

Back 1064

A governmental unit or political division or a subdivision.

Front 1065

Jurisdiction

Back 1065

Any governmental unit or political division or subdivision including, but not limited to, township, village, borough, parish, city, county, state, commonwealth, province, freehold, district, or territory over which the governmental unit exercises power and authority.

Front 1066

Jurisdiction

Back 1066

Any governmental unit or political division or subdivision, including, but not limited to, township, village, borough, parish, city, county, state, commonwealth, province, freehold, district, or territory over which the governmental unit exercises power and authority. [1141,
2008]

Front 1067

Jurisdiction

Back 1067

Legally constituted governmental unit that has adopted this Code by law or ordinance.

Front 1068

Jurisdictional Requirements

Back 1068

Those documents or controls, other than codes and standards, that are legally adopted and enforced by a jurisdiction.

Front 1069

Juvenile Firesetter

Back 1069

A person, through the age of 18, or as defined by the authority having jurisdiction, who is involved in the act of firesetting.

Front 1070

Juvenile Firesetter
Intervention Specialist I

Back 1070

The individual who has demonstrated the ability to conduct an intake/interview with a firesetter and his or her family using prepared forms and guidelines and who, based on program policies and procedures, determines the need for referral for counseling and/or implements educational intervention strategies to mitigate effects of firesetting behavior.

Front 1071

Juvenile Firesetter
Intervention Specialist II

Back 1071

The individual who has demonstrated the ability to manage juvenile firesetting intervention program activities and the activities of Juvenile Firesetter Intervention Specialist I.

Front 1072

Keel

Back 1072

The principal structural member of a ship, running fore and aft on
the centerline, extending from bow to stern, forming the backbone of
the vessel to which the frames are attached.

Front 1073

Keeper

Back 1073

A guide and a restraint used on latching devices.

Front 1074

Kerosene

Back 1074

A light, highly refined fuel that is slightly more volatile than No. 2 fuel oil. Its properties are defined in ASTM D 396, Standard Specification for Fuel Oils; ASTM D 1655, Standard Specification for Aviation Turbine Fuels; or ASTM D 2880, Standard Specification for Gas Turbine Fuel Oils.

Front 1075

Kerosene-Fired Portable
Heater

Back 1075

An unvented, self-contained, self-supporting heater, with integral reservoir, designed to be carried from one location to another.

Front 1076

Kerosene Stove

Back 1076

An unvented, self-contained, self-supporting kerosene-burning range or room heater equipped with an integral fuel tank not exceeding a
2-gal (7.6-L) capacity.

Front 1077

Kettle

Back 1077

An appliance with a cooking chamber that is heated either by a steam jacket in which steam is generated by gas heat or by direct gas heat applied to the cooking chamber.

Front 1078

Keypad

Back 1078

A device that is a type of human/machine interface (HMI) with numerical or function keys that can incorporate an annunciator or signaling device.

Front 1079

KG

Back 1079

The deflagration index of a gas cloud.

Front 1080

Kilowatt

Back 1080

A measurement of energy release rate.

Front 1081

Kink Test Pressure

Back 1081

A pressure equal to at least 1.5 times the service test pressure.

Front 1082

Kitchen

Back 1082

An area designated for storage, preparation, cooking, and serving of food for members.

Front 1083

Kitchen

Back 1083

An area with a sink and permanent facilities for food preparation and cooking.

Front 1084

Kitchen Match

Back 1084

A piece of wood with a combustible mixture at its tip that bursts into flame through friction, with an approximate length of 61.9 mm (27⁄16 in.) and an approximate weight of 29 g (1 oz) per hundred.

Front 1085

Knee Circumference

Back 1085

Lower torso garment measurement 355 mm (14 in.) below crotch seam, from folded edge to folded edge, and multiplied by 2 to obtain circumference.

Front 1086

Knockdown

Back 1086

A fire-fighting term defining the reduction of flame and heat to a point where further extension of a fire has been abated and the overhaul stage can begin.

Front 1087

Knocked-Down Frame

Back 1087

Door frame furnished by manufacturer in three or more basic parts for assembly in the field.

Front 1088

Knot

Back 1088

A fastening made by tying together lengths of rope or webbing in a prescribed way.

Front 1089

Knot

Back 1089

A fastening made by tying together lengths of rope or webbing in a prescribed way. [1670, 2004]

Front 1090

Knot Wood Irregularity

Back 1090

A portion of a branch or limb embedded in the tree and cut during the process of lumber manufacture.

Front 1091

Knowledge

Back 1091

What the individual must know or understand in order to carry out a role and subsequent tasks to the standard required.

Front 1092

Knuckle

Back 1092

A point of connection between upper and lower booms of an articulating device; the point at which lower and upper booms are hinged together.

Front 1093

Knuckle

Back 1093

A point of connection between upper and lower booms of an articulating device; the point at which lower and upper booms are hinged together. [1901, 2003]

Front 1094

kPa

Back 1094

Absolute pressure in kilo-Pascals.

Front 1095

kPa

Back 1095

Absolute pressure in kilo-Pascals. [58, 2008]

Front 1096

kPa

Back 1096

Kilopascals.

Front 1097

kPag

Back 1097

Gauge pressure in kilo-Pascals.

Front 1098

kPag

Back 1098

Gauge pressure in kilo-Pascals. [58, 2008]

Front 1099

KSt

Back 1099

The deflagration index of a dust cloud.

Front 1100

Label

Back 1100

A visual indication whether in pictorial or word format that provides for the identification of a control, switch, indicator, or gauge, or the display of information useful to the operator.

Front 1101

Label

Back 1101

A visual indication whether in pictorial or word format that provides for the identification of a control, switch, indicator, or gauge, or the display of information useful to the operator.
[1901, 2003]

Front 1102

Labeled

Back 1102

Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled
equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.

Front 1103

Labeled

Back 1103

Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled
equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. (See also definition 3.3.79, Product Label.)

Front 1104

Laboratory

Back 1104

A building, space, room, or group of rooms intended to serve activities involving procedures for investigation, diagnosis, or treatment in which flammable, combustible, or oxidizing materials are to be used. (LAB)

Front 1105

Laboratory

Back 1105

A building, space, room, or group of rooms intended to serve activities involving procedures for investigation, diagnostics, product testing, or use of custom or special electrical components, systems, or equipment.

Front 1106

Laboratory

Back 1106

A facility where the containers used for reactions, transfers, and other handling of chemicals are designed to be easily and safely manipulated by one person. It is a workplace where chemicals are used or synthesized on a nonproduction basis.

Front 1107

Laboratory Apparatus

Back 1107

Furniture, laboratory hoods, centrifuges, refrigerators, and commercial or made-on-site equipment used in a laboratory.

Front 1108

Laboratory Building

Back 1108

A structure consisting wholly or principally of one or more laboratory units.

Front 1109

Laboratory Scale

Back 1109

Work with chemicals in which the containers used for reactions, transfers, and other handling of chemicals are designed to be easily and safely manipulated by one person.

Front 1110

Laboratory Unit

Back 1110

An enclosed space used for experiments or tests. A laboratory unit can include offices, lavatories, and other incidental contiguous rooms maintained for or used by laboratory personnel, and corridors within the unit. It can contain one or more separate laboratory work areas. It can be an entire building. A laboratory unit is classified as A, B, C, or
D in accordance with Section 4.2. (See also Annex D.)

Front 1111

Laboratory Unit Separation

Back 1111

All walls, partitions, floors, and ceilings, including openings in them, that separate a laboratory unit from adjoining areas.

Front 1112

Laboratory Work Area

Back 1112

A room or space for testing, analysis, research, instruction, or similar activities that involve the use of chemicals.

Front 1113

Laboratory Work Area

Back 1113

A room or space for testing, analysis, research, instruction, or similar activities that involve the use of chemicals. This work area may or may not be enclosed. (LAB)

Front 1114

Laced Tire Storage

Back 1114

Tires stored where the sides of the tires overlap, creating a woven or laced appearance. [See Figure A.34.8.1(g).] [13, 2007]

Front 1115

Laced Tire Storage

Back 1115

Tires stored where the sides of the tires overlap, creating a woven or laced appearance. [See Figure A.3.9.4.9(g).]

Front 1116

Ladder

Back 1116

A device consisting of two beams (side rails) joined at regular intervals by cross pieces called rungs on which a person is supported during climbs for ascending or descending. (See also 3.3.24, Pompier Ladder.) [1931:3.3]

Front 1117

Ladder

Back 1117

A device consisting of two beams (side rails) joined at regular intervals by cross pieces called rungs on which a person is supported during climbs for ascending or descending. (See also 3.3.29, Pompier Ladder.)

Front 1118

Ladder

Back 1118

All staircases, often nearly vertical, on board vessels.

Front 1119

Ladder Belt

Back 1119

A compliant equipment item that is intended for use as a positioning device for a person on a ladder.

Front 1120

Ladder Cradle

Back 1120

A structural component that supports an aerial ladder when it is bedded.

Front 1121

Ladder Locks

Back 1121

The mechanical locks or pawls that prevent movement of the sections of an aerial device when the power is shut off or in the event of loss of pressure in hydraulic circuits.

Front 1122

Ladder Nesting

Back 1122

The procedure whereby ladders of different sizes are positioned partially within one another to reduce the amount of space required for their storage on the apparatus.

Front 1123

Ladder Pipe

Back 1123

A monitor that is fed by a hose and that holds and directs a nozzle while attached to the rungs of a vehicle-mounted aerial ladder.

Front 1124

Ladder Section

Back 1124

A structural member normally of an open “U” truss-type design that includes the rungs and comprises the base or fly section of an aerial ladder.

Front 1125

Ladder Shank

Back 1125

Reinforcement to the shank area of protective footwear designed to provide additional support to the instep when standing on a ladder rung.

Front 1126

Laminar Flow Cabinet

Back 1126

A ventilated, partially enclosed cabinet primarily intended to provide filtered airflow over the work surface by use of laminar airflow methods.

Front 1127

Lamp

Back 1127

An illuminating indicator.

Front 1128

Lance

Back 1128

A device, without its own air supply, that provides fuel input directly into a fluidized bed.

Front 1129

Lance

Back 1129

A thin cardboard tube packed with color-producing pyrotechnic composition used to construct ground display pieces.

Front 1130

Land Development

Back 1130

The change of use of a parcel of land or contiguous parcels of land controlled by a single landowner or by a group of landowners with or without a common agreement to control the land so as to provide the buildings and infrastructure for residential and/or commercial purposes.

Front 1131

Landfill Gas

Back 1131

The biogas derived from decomposition of municipal solid waste
(landfill).

Front 1132

Land Use

Back 1132

The type or degree of activity occurring or intended to occur on a piece of land.

Front 1133

Lap-Mounted Door (Sliding Door, Vertical Door, Horizontal Door, Swinging Door)

Back 1133

Doors mounted on the face of a wall and overlapping the opening by a prescribed dimension.

Front 1134

Large Combustible Liquid
Storage Area

Back 1134

An area used for storage of Class II and Class III combustible liquids where the aggregate quantity present is greater than 3785 L (1000 gal). Handling of liquids incidental to transfer can take place within a storage area.

Front 1135

Large-Diameter Hose

Back 1135

A hose 89 mm (3.5 in.) or larger that is designed to move large volumes of water to supply master stream appliances, portable hydrants, manifolds, standpipe and sprinkler systems, and fire department pumpers from hydrants and in relay.

Front 1136

Large-Diameter Hose

Back 1136

A hose of 31⁄2 in. (90 mm) or larger size.

Front 1137

Large-Diameter Hose

Back 1137

A hose of 31⁄2 in. (90 mm) or larger size. [1961, 2007]

Front 1138

Large Diameter Hose

Back 1138

A hose of 31⁄2 in. (90 mm) size or larger. [1961, 2002]

Front 1139

Large Drop Sprinkler

Back 1139

A type of specific application control mode sprinkler that is capable of producing characteristic large water droplets and that is listed for its capability to provide fire control of specific high-challenge fire hazards.

Front 1140

Large Drop Sprinkler

Back 1140

A type of specific application control mode sprinkler that is capable of producing characteristic large water droplets and that is listed for its capability to provide fire control of specific high-challenge fire hazards. [13, 2007]

Front 1141

Large Early Release

Back 1141

Significant, unmitigated release from containment in a time frame prior to effective evacuation of the close-in population such that there is a potential for early health effects. [NRC Regulatory Guide 1.174]

Front 1142

Large Flammable Liquid
Storage Area

Back 1142

An area used for storage of Class I liquids where the aggregate quantity present is greater than 37.8 L (10 gal).

Front 1143

Large Machinery

Back 1143

Complex machines (or machinery systems) constructed of heavy materials, not capable of simple disassembly, and presenting multiple concurrent hazards (e.g., control of energy sources, hazardous materials, change in elevation, multiple rescue disciplines, etc.), complex victim entrapment, or partial or complete amputation, and requiring the direct technical assistance of special experts in the design, maintenance, or construction of the device or machine.

Front 1144

Large-Stream Device

Back 1144

Any device that discharges water at a flow rate greater than 400 gpm
(1600 L/min).

Front 1145

Large-Volume Space

Back 1145

An uncompartmented space, generally two or more stories in height, within which smoke from a fire either in the space or in a communicating space can move and accumulate without restriction.

Front 1146

Laser

Back 1146

A device that produces an intense, coherent, directional beam of light by stimulating electronic or molecular transitions to lower energy levels (an acronym for Light Amplification by Stimulated Emission of Radiation).

Front 1147

Laser

Back 1147

Any device that can be made to produce or amplify electromagnetic radiation in the wavelength range from 100 nm to 1 mm primarily by the process of controlled stimulated emission.

Front 1148

Laser Energy Source

Back 1148

Any device intended for use in conjunction with a laser to supply energy for the excitation of electrons, ions, or molecules. General energy sources, such as electrical supply services or batteries, shall not be considered to constitute laser energy sources.

Front 1149

Laser Product

Back 1149

Any product or assembly of components that constitutes, incorporates, or is intended to incorporate a laser or laser system.

Front 1150

Laser Radiation

Back 1150

All electromagnetic radiation emitted by a laser product between 100 nm and 1 mm that is produced as a result of a controlled stimulated emission.

Front 1151

Laser Safety Personnel (LSP)

Back 1151

One who has authority to monitor and enforce the control of laser hazards and to effect the knowledgeable evaluation and control of laser hazards.

Front 1152

Laser System

Back 1152

A laser in combination with an appropriate laser energy source with or without additional incorporated components.

Front 1153

Laser System

Back 1153

An assembly of electrical, mechanical, and optical components that includes a laser.

Front 1154

Laser Target

Back 1154

A square or rectangular plastic device used in conjunction with a laser instrument to set the line and grade of pipe.

Front 1155

Laser Target

Back 1155

A square or rectangular plastic device used in conjunction with a laser instrument to set the line and grade of pipe. [1670, 2004]

Front 1156

Latching Device

Back 1156

A spring-loaded latch bolt or a gravity-operated steel bar that, after release by physical action, returns to its operating position and automatically engages the strike plate when it is returned to the closed position.

Front 1157

Lateral Brace

Back 1157

A sway brace intended to resist differential movement perpendicular to the axis of the pipe.

Front 1158

Launching Area

Back 1158

An area designated by the range safety officer in which high power rockets are placed on a launching device and ignited.

Front 1159

Launch Site

Back 1159

An area used for high power rocket activities that includes (1) a prepping area(s), (2) a launching area(s), (3) a recovery area(s), (4) a spectator area(s), and (5) a spectator parking area(s).

Front 1160

Launch Site Parking Area

Back 1160

An area designated by the range safety officer for parking spectator vehicles.

Front 1161

Laundry Area

Back 1161

An area containing or designed to contain a laundry tray, clothes washer, or a clothes dryer.

Front 1162

Layering

Back 1162

The systematic process of removing debris from the top down and observing the relative location of artifacts at the fire scene.

Front 1163

LC50

Back 1163

A measure of lethal toxic potency measured in units of g·m-3; the concentration of gas or fire effluent statistically calculated from concentration response data to produce lethality in 50 percent of test animals within a specified exposure and postexposure time.

Front 1164

LC50

Back 1164

(Lethal Concentration50). The concentration of agent in water, usually expressed as milligrams of agent in a liter or solution, that results in the death of 50 percent of the aquatic test specimens within a specified time frame.

Front 1165

LD50

Back 1165

(Lethal Dosage50). The dosage of a chemical, usually expressed as milligrams of the chemical per kilogram of body weight of the test animal, at which 50 percent of the test animals die within a specified time frame.

Front 1166

Lead

Back 1166

A rope, chain, or strap of suitable length with a clasp at one end used for handling and leading animals by a halter, collar, or harness.

Front 1167

Leader

Back 1167

The individual responsible for command of a task force, strike team, or functional unit.

Front 1168

Leader Line

Back 1168

A hose line supplying one or more smaller lines, as in a wyed line.

Front 1169

Leak

Back 1169

The escape of a gas or liquid from a hose, pipe, coupling, connection, or other confining structure at any point where the escape should not occur.

Front 1170

Leakage

Back 1170

The escape of a fluid from its intended containment, generally at a connection.

Front 1171

Leakage Current

Back 1171

Any current, including capacitively coupled current, not intended to be applied to a patient, that is conveyed from exposed conductive parts of an appliance to ground or to other accessible parts of an appliance. (ELE)

Front 1172

Leakage-Current Detector-Interrupter (LCDI)

Back 1172

A device provided in a power supply cord or cord set that senses leakage current flowing between or from the cord conductors and interrupts the circuit at a predetermined level of leakage current.

Front 1173

Leak Check

Back 1173

An operation performed on a gas piping system to verify that the system does not leak.

Front 1174

Leakproof Bags

Back 1174

Bags that are sufficiently sturdy to prevent tearing or breaking and can be sealed securely to prevent leakage and that are red in color or display the universal biohazard symbol.

Front 1175

Lean Mixture

Back 1175

A fuel and oxidizer mixture having less than the stoichiometric concentration of fuel.

Front 1176

Lecture Bottle

Back 1176

A small compressed gas cylinder up to a size of approximately 5 cm
× 33 cm (2 in. × 13 in.).

Front 1177

Ledge Plate

Back 1177

A form of plate that is adjacent to, and overlaps, the edge of a stoker.

Front 1178

Legally Required Standby
Systems

Back 1178

Those systems required and so classed as legally required standby by municipal, state, federal, or other codes or by any governmental agency having jurisdiction. These systems are intended to automatically supply power to selected loads (other than those classed as emergency systems) in the event of failure of the normal source.

Front 1179

Leg Facility

Back 1179

The portion of a communications channel that connects not more than one protected premises to a primary or secondary trunk facility. The leg facility includes the portion of the signal transmission circuit from its point of connection with a trunk facility to the point where it is terminated within the protected premises at one or more transponders. (SIG-SSS)

Front 1180

Legitimate Stage

Back 1180

A stage with a height greater than 50 ft (15 m) measured from the lowest point on the stage floor to the highest point of the roof or floor deck above.

Front 1181

Length of Tunnel

Back 1181

The length from face of portal to face of portal that is measured using the centerline alignment along the tunnel roadway.

Front 1182

Less Flammable Liquid

Back 1182

A combustible dielectric liquid listed as having a fire point of not less than 572°F (300°C).

Front 1183

Lesson

Back 1183

A component of a program in which the educator directly presents fire or life safety information to a group.

Front 1184

Level 1 Medical Piped Gas and
Vacuum Systems

Back 1184

Systems serving occupancies where interruption of the piped medical gas and vacuum system would place patients in imminent danger of morbidity or mortality. (PIP)

Front 1185

Level 1 Vacuum System

Back 1185

A system consisting of central-vacuum-producing equipment with pressure and operating controls, shutoff valves, alarm warning systems, gauges, and a network of piping extending to and terminating with suitable station inlets at locations where patient suction could be required. (PIP)

Front 1186

Level 2 Medical Piped Gas and
Vacuum Systems

Back 1186

Systems serving occupancies where interruption of the piped medical gas and vacuum system would place patients at manageable risk of morbidity or mortality. (PIP)

Front 1187

Level 3 Alarm System

Back 1187

A warning system within an area of use that provides continuous visible and audible surveillance of Level 3 medical gas systems. (PIP)

Front 1188

Level 3 Compressed Air System

Back 1188

A system of component parts, including, but not limited to, air compressor, motor, receiver, controls, filters, dryers, valves, and piping, that delivers compressed air <1100 kPa (<160 psi gauge) to power devices (hand pieces, syringe, cleaning devices, etc.) as a power source. (PIP)

Front 1189

Level 3 Piped Gas Systems

Back 1189

Systems serving occupancies where interruption of the piped medical gas would terminate procedures but would not place patients at risk of morbidity or mortality. (PIP)

Front 1190

Level 3 Piped Vacuum System

Back 1190

A Level 3 vacuum distribution system that can be either a wet system designed to remove liquids, air-gas, or solids from the treated area; or a dry system designed to trap liquid and solids before the service inlet and to accommodate air-gas only through the service inlet. (PIP)

Front 1191

Level Ceilings

Back 1191

Ceilings that are level or have a slope of less than or equal to 1 in 8. (SIG-IDS)

Front 1192

Level II Refurbishing

Back 1192

The upgrade of major components or systems of a fire apparatus with components or systems that comply with the applicable standards in effect at the time the original apparatus was manufactured.

Front 1193

Level II Technical Rescuer

Back 1193

This level applies to individuals who identify hazards, use equipment, and apply advanced techniques specified in this standard to perform
technical rescue operations.

Front 1194

Leveling Linkages

Back 1194

The components and controls for achieving a level position of the platform.

Front 1195

Level I Refurbishing

Back 1195

The assembly of a new fire apparatus by the use of a new chassis frame, driving and crew compartment, front axle, steering and suspension components, and the use of either new components or components from an existing apparatus for the remainder of the apparatus.

Front 1196

Level I Technical Rescuer

Back 1196

This level applies to individuals who identify hazards, use equipment, and apply limited techniques specified in this standard to perform technical rescue operations.

Front 1197

Level of Exit Discharge

Back 1197

The story that is either (1) The lowest story from which not less than
50 percent of the required number of exits and not less than 50 percent
of the required egress capacity from such a story discharge directly
outside at the finished ground level; or (2) where no story meets the
conditions of (1), the story that is provided with one or more exits that
discharge directly to the outside to the finished ground level via the
smallest elevation change.

Front 1198

Level of Exit Discharge

Back 1198

The story that is either (1) the lowest story from which not less than
50 percent of the required number of exits and not less than 50 percent
of the required egress capacity from such a story discharge directly
outside at the finished ground level; or (2) where no story meets the
conditions of item (1), the story that is provided with one or more exits
that discharge directly to the outside to the finished ground level via the
smallest elevation change.

Front 1199

Levers

Back 1199

Tools that have a relationship of load/fulcrum/force to create mechanical advantage and move a load.

Front 1200

Lever-Type Control

Back 1200

A control in which the handle operates along the axis of the nozzle.

Front 1201

LH2

Back 1201

Hydrogen in a liquid form normally stored below its critical pressure
(190.43 psi).

Front 1202

Liability

Back 1202

Legal responsibility and accountability for an act or process related to a program.

Front 1203

Liaison

Back 1203

The individual responsible for the coordination of activities with assisting agencies.

Front 1204

Liaison Officer

Back 1204

A member of the command staff, responsible for coordinating with representatives from cooperating and assisting agencies.

Front 1205

Liaison Officer

Back 1205

A member of the command staff, the point of contact for assisting or coordinating agencies.

Front 1206

Library

Back 1206

Any building or place in which books and other media are kept for reading, reference, research, or lending.

Front 1207

Library

Back 1207

A place in which books and other media are kept for reading, reference, or lending.

Front 1208

Life Rail, Deck Rail, or
Lifeline

Back 1208

A single rail or the entire assembly of stanchions, lines, or rails, including hardware, gates, and so forth, surrounding weather decks and designed to prevent falls overboard.

Front 1209

Life Safety Branch

Back 1209

A subsystem of the emergency system consisting of feeders and branch circuits, meeting the requirements of Article 700 and intended to provide adequate power needs to ensure safety to patients and personnel, and that are automatically connected to alternate power sources during interruption of the normal power source. [99:3.3.96]

Front 1210

Life Safety Branch

Back 1210

A subsystem of the emergency system consisting of feeders and branch circuits, meeting the requirements of Article 700 of NFPA 70, National Electrical Code, and intended to provide adequate power needs to ensure safety to patients and personnel, and that is automatically connected to alternate power sources during interruption of the normal power source. (ELS)

Front 1211

Life Safety Evaluation

Back 1211

A written review dealing with the adequacy of life safety features relative to fire, storm, collapse, crowd behavior, and other related safety considerations.

Front 1212

Life Safety Harness

Back 1212

An equipment item; an arrangement of materials secured about the body used to support a person.

Front 1213

Life Safety Harness

Back 1213

A system component that is an arrangement of materials secured about the body and used to support a person during rescue.

Front 1214

Life Safety Network

Back 1214

A type of combination system that transmits fire safety control data through gateways to other building system control units. (SIG-PRO)

Front 1215

Life Safety Rope

Back 1215

A compact but flexible, torsionally balanced, continuous structure of fibers produced from strands that are twisted, plaited, or braided together and that serve primarily to support a load or transmit a force from the point of origin to the point of application.

Front 1216

Life Safety Rope

Back 1216

Rope dedicated solely for the purpose of supporting people during rescue, fire-fighting, other emergency operations, or during training evolutions.

Front 1217

Life Safety Rope

Back 1217

Rope dedicated solely for the purpose of supporting people during rescue, fire fighting, other emergency operations, or during training evolutions. (See also 3.3.158, Rope.)

Front 1218

Life Safety Systems

Back 1218

Those systems that enhance or facilitate evacuation, smoke control, compartmentalization, and/or isolation.

Front 1219

Lift

Back 1219

A mechanically or electrically operated platform used to work at various heights within a building.

Front 1220

Lift

Back 1220

The vertical height that water must be raised during a drafting operation, measured from the surface of a static source of water to the centerline of the pump intake.

Front 1221

Lift

Back 1221

The vertical height that water must be raised during a drafting operation, measured from the surface of a static source of water to the centerline of the pump intake [1911, 2002]

Front 1222

Lift Charge

Back 1222

The composition in a pyrotechnic device that propels (lifts) the effect into the air when ignited.

Front 1223

Lift Charge

Back 1223

The composition that propels (lifts) the pyrotechnic device into the air.

Front 1224

Lifting Tools

Back 1224

Hydraulic, pneumatic, mechanical, or manual tools that can lift heavy loads.

Front 1225

Light-Diffusing System

Back 1225

Panels, grids, baffles, or lenses made with light-transmitting plastics, positioned below independently mounted electrical light sources, skylights, or light-transmitting roof panels.

Front 1226

Light Frame Construction

Back 1226

Structures that have framework made out of wood or other lightweight materials. (See Annex D.)

Front 1227

Light-Framed Wall

Back 1227

A wall with wood or steel studs. [ASCE/SEI 7:11.2]

Front 1228

Light-Framed Wood Shear
Wall

Back 1228

A wall constructed with wood studs and sheathed with material rated for shear resistance. [ASCE/SEI 7:11.2]

Front 1229

Light Hazard Occupancy

Back 1229

Occupancies or portions of other occupancies where the quantity and/or combustibility of contents is low and fires with relatively low rates of heat release are expected.

Front 1230

Lighting Outlet

Back 1230

An outlet intended for the direct connection of a lampholder, a luminaire (lighting fixture), or a pendant cord terminating in a lampholder.

Front 1231

Lighting Outlet

Back 1231

An outlet intended for the direct connection of a lampholder or luminaire.

Front 1232

Lighting Systems Operating at
30 Volts or Less

Back 1232

A lighting system consisting of an isolating power supply, the low-voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply are rated for not more than 25 amperes and operate at 30 volts (42.4 volts peak) or less under all load conditions.

Front 1233

Lighting Track.

Back 1233

A manufactured assembly designed to support and energize
luminaires that are capable of being readily repositioned on the track.
Its length can be altered by the addition or subtraction of sections of
track.

Front 1234

Light (Low) Hazards

Back 1234

Light (low) hazard occupancies shall be classified as locations where the quantity and combustibility of Class A combustibles and Class B flammables is low and fires with relatively low rates of heat release are expected. These occupancies consist of fire hazards having normally expected quantities of Class A combustible furnishings and/or the total anticipated quantity of Class B flammables present is expected to be less than 1 gal (3.8 L) in any room or area. [10, 2007]

Front 1235

Lightning Protection System

Back 1235

A complete system of strike termination devices, conductors (which could include conductive structural members), grounding electrodes, interconnecting conductors, surge protective devices, and other connectors and fittings required to complete the system.

Front 1236

Light-Off Time Limit Timer

Back 1236

A device that is used on supervised manual burner management systems and limits the allowable time between completion of purge and light-off.

Front 1237

Light-Transmitting Plastic

Back 1237

Plastic material that is used to transmit light into structures.

Front 1238

Light-Transmitting Plastic
Roof Panel

Back 1238

A structural plastic panel in the plane of the roof, fastened to roof members, that transmits light into the structure.

Front 1239

Light-Transmitting Plastic Wall
Panel

Back 1239

A plastic panel fastened to structural wall members that transmits light into the structure.

Front 1240

Light Use

Back 1240

One designation of an equipment item or manufactured systems designed for light-use loads, and escape based on design loads and performance requirements.

Front 1241

Lightweight Construction

Back 1241

Lightweight materials or advanced engineering or both practices resulting in a weight saving without sacrifice of strength or efficiency.

Front 1242

Likelihood

Back 1242

Frequency, probability, or their combination.

Front 1243

Likely to Become Energized

Back 1243

Failure of insulation on.

Front 1244

Limber Holes

Back 1244

Holes in hull framing members to permit draining of liquids.

Front 1245

Limit

Back 1245

Prescribe a minimum or maximum size, quantity, number, mass, extent, or other dimension.

Front 1246

Limit Amount Exposed

Back 1246

Limit the maximum amount of exposed.

Front 1247

Limit Control

Back 1247

A device responsive to changes in pressure, temperature, or liquid level for turning on, shutting off, or throttling the gas supply to an appliance.

Front 1248

Limit Control

Back 1248

An automatic safety control that responds to changes in fluid flow, fluid level, pressure, or temperature, which is normally set beyond the operating range to limit the operation of the controlled equipment by shutting off the energy supply.

Front 1249

Limited Access Highway

Back 1249

A highway where preference is given to through-traffic by providing access connections that use only selected public roads and by prohibiting crossings at grade and at direct private driveways.

Front 1250

Limited Access Structure

Back 1250

A structure or portion of a structure lacking emergency openings.

Front 1251

Limited Care Facility

Back 1251

A building or portion of a building used on a 24-hour basis for the housing of four or more persons who are incapable of
self-preservation because of age; physical limitations due to accident or illness; or limitations such as mental retardation/developmental disability, mental illness, or chemical dependency.

Front 1252

Limited Care Facility

Back 1252

A building or portion of a building used on a 24-hour basis for the housing of four or more persons who are incapable of
self-preservation because of age; physical limitations due to accident or illness; or limitations such as mental retardation/developmental disability, mental illness, or chemical dependency. [101, 2009]

Front 1253

Limited Care Facility

Back 1253

A building or portion of a building used on a 24-hour basis for the housing of four or more persons who are incapable of
self-preservation because of age; physical limitations due to accident or illness; or limitations such as mental retardation/developmental disability, mental illness, or chemical dependency. [99, 2005]

Front 1254

Limited Care Facility

Back 1254

A building or portion of a building used on a 24-hour basis for the housing of four or more persons who are incapable of
self-preservation because of age; physical limitations due to accident or illness; or limitations such as mental retardation/developmental disability, mental illness, or chemical dependency. (ADM)

Front 1255

Limited Care Facility

Back 1255

A building or portion thereof used on a 24-hour basis for the housing of four or more persons who are incapable of self-preservation because of age; physical limitation due to accident or illness; or limitations such as mental retardation/developmental disability, mental illness, or chemical dependency. [99:3.3.97]

Front 1256

Limited Combustible

Back 1256

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible. [220, 1999]

Front 1257

Limited Combustible

Back 1257

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.) [33, 2007]

Front 1258

Limited Combustible

Back 1258

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.) [33:3.3]

Front 1259

Limited Combustible

Back 1259

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.) [55, 2005]

Front 1260

Limited Combustible

Back 1260

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 8140 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3 mm (1⁄8 in.) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.)

Front 1261

Limited Combustible

Back 1261

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surface not exceeding a thickness of 3.2 mm (1⁄8 in.) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein
established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.) [33:3.3]

Front 1262

Limited Combustible

Back 1262

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm (0.127 in.) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.)

Front 1263

Limited Combustible

Back 1263

A building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and complies with (a) or (b): (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3 mm (1⁄8 in.) that has a flame spread index not greater than 50; and (b) materials, in the form and thickness used, other than as described in (a), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. (Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition shall be considered combustible.) [33, 2003]

Front 1264

Limited Combustible

Back 1264

In nuclear facilities, a material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg) and either has a structural base of noncombustible material with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread rating not greater than 50, or has another material having neither a flame spread rating greater than 25 nor evidence of continued progressive combustion, even on surfaces exposed by cutting through the material on any plane.

Front 1265

Limited-Combustible Material

Back 1265

A material (as defined in NFPA 220, Standard on Types of Building Construction) not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat
value not exceeding 8141 kJ/kg (3500 Btu/lb) and complies with one of the following: (a) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm (1⁄8 in.) and having a flame-spread rating not greater than
50 or (b) materials, in the form and thickness used, other than as described in (a), having neither a flame-spread rating greater than 25 nor evidence of continued progressive combustion and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame-spread rating greater than 25 nor evidence of continued progressive combustion. (PIP)

Front 1266

Limited-Combustible Material

Back 1266

As applied to a material of construction, any material that does not meet the definition of noncombustible, as stated elsewhere in this section, and that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3,500 Btu/lb) when tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and also meets one of the following subparagraphs (a) or (b). (a) Materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm
(0.13 in.) that has a flame spread index not greater than 50, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials. (b) Materials, in the form and thickness used and not described by (a) above, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion and having such composition that surfaces that would be exposed by cutting through the material in any plane have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials.

Front 1267

Limited-Combustible
(Material)

Back 1267

Refers to a building construction material not complying with the definition of noncombustible material (see 3.3.340.11 of NFPA 5000) that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259 and includes (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 0.125 in. (3.2 mm) that has a flame spread index not greater than
50; and (2) materials, in the form and thickness used, other than as described in (1), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. [5000, 2006]

Front 1268

Limited-Combustible Material

Back 1268

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259 and includes (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a
flame spread index not greater than 50; and (2) materials, in the form and thickness used, other than as described in (1), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion.

Front 1269

Limited-Combustible Material

Back 1269

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50 or (2) materials, in the form and thickness used having neither a flame spread index greater than
25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion when tested in accordance with NFPA 255 or ASTM E 84. [220, 2006]

Front 1270

Limited-Combustible Material

Back 1270

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test
Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; (2) materials, in
the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials, or ASTM E 84. Standard Test Method of Surface Burning Characteristics of Building Materials. [5000, 2006]

Front 1271

Limited-Combustible
(Material)

Back 1271

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (2) materials,
in the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with ASTM E 84, Standard Test Method of Surface Burning Characteristics of Building Materials, or ANSI/UL 723 Standard Test Method for Surface Burning Characteristics of Building Materials.

Front 1272

Limited-Combustible
(Material)

Back 1272

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (2) materials,
in the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with ASTM E 84, Standard Test Method of Surface Burning Characteristics of Building Materials; or UL 723, Standard for Test of Surface Burning Characteristics of Building Materials.

Front 1273

Limited-Combustible
(Material)

Back 1273

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; and (2) materials,
in the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials, or ASTM E 84, Standard Test Method of Surface Burning Characteristics of Building Materials. [5000, 2006]

Front 1274

Limited-Combustible Material

Back 1274

Refers to a building construction material not complying with the definition of noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500
Btu/lb), where tested in accordance with NFPA 259 and includes (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a
flame spread index not greater than 50; and (2) materials, in the form and thickness used, other than as described in (1), having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. [5000, 2006]

Front 1275

Limited-Combustible
(Material)

Back 1275

Refers to a building construction material not complying with the definition of noncombustible (see 3.3.160.3) that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; (2) materials, in
the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion.

Front 1276

Limited-Combustible
(Material)

Back 1276

Refers to a building construction material not complying with the definition of noncombustible (see 3.3.161.9) that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and includes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1⁄8 in. (3.2 mm) that has a flame spread index not greater than 50; (2) materials, in
the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion. [101, 2009]

Front 1277

Limited-Combustible Material

Back 1277

Refers to a building construction material not complying with the definition of noncombustible that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259 and includes either (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm (1⁄8 in.) that has a flame spread index not greater than 50, or (2) materials, in the form and thickness used having neither a flame spread index greater than 25 nor
evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255 or ASTM E 84. [220, 2006]

Front 1278

Limited-Combustible Material

Back 1278

Refers to a building construction material not complying with the definition of noncombustible that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259 and includes either (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm (1⁄8 in.) that has a flame spread index not greater than 50, or (2) materials, in the form and thickness used having neither a flame spread index greater than 25 nor
evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with UL 723 or ASTM E 84.

Front 1279

Limited-Combustible Material

Back 1279

Refers to a building construction not complying with the definition of noncombustible that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb), where tested in accordance with NFPA 259, and includes either (1) materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 3.2 mm (1⁄8 in.) that has a flame spread index not greater than 50; or (2) materials, in the form and thickness used, having neither a flame spread index greater than 25 nor evidence of continued progressive combustion, and of such composition that surfaces that would be exposed by cutting through the material on
any plane would have neither a flame spread index greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255 or ASTM E 84. [220, 2006]

Front 1280

Limited Finishing Workstation

Back 1280

An apparatus that is capable of confining the vapors, mists, residues, dusts, or deposits that are generated by a spray application process and that meets the requirements of Section 14.3, but does not meet the requirements of a spray booth or spray room, as herein defined.

Front 1281

Limited-Growth Fires

Back 1281

Fires that are not expected to grow beyond a predictable maximum heat release rate.

Front 1282

Limited-Use Garment

Back 1282

A garment whose service life is limited by the manufacturer to a specified number of wear cycles and does not meet the testing requirements of this standard.

Front 1283

Limit Fuel Quantity

Back 1283

Limit the amount of fuel that potentially can become involved in fire.

Front 1284

Limiting Fire Scenarios

Back 1284

Fire scenario(s) in which one or more of the inputs to the fire modeling calculation (e.g., heat release rate, initiation location, or ventilation rate) are varied to the point that the performance criterion is not met. The intent of this scenario(s) is to determine that there is a reasonable margin between the expected fire scenario conditions and the point of failure. (See Annex C for a discussion of limiting fire scenarios and margin.)

Front 1285

Limiting Oxidant Concentration
(LOC)

Back 1285

The concentration of oxidant below which a deflagration cannot occur.

Front 1286

Limiting Oxidant Concentration
(LOC)

Back 1286

The concentration of oxidant in a fuel-oxidant-diluent mixture below which a deflagration cannot occur under specified conditions.

Front 1287

Limit State

Back 1287

A condition beyond which a structure or member becomes unfit for service and is judged either to be no longer useful for its intended function (serviceability limited state) or to be unsafe (strength limit state). [ASCE/SEI 7:1.2]

Front 1288

Limit Switch

Back 1288

A switch that actuates when an operating limit has been reached.

Front 1289

Line

Back 1289

One or more lengths of connected fire hose.

Front 1290

Line

Back 1290

Rope when in use.

Front 1291

Line

Back 1291

Rope, when in use. [1983, 2006]

Front 1292

Line Burner

Back 1292

A burner whose flame is a continuous line.

Front 1293

Line Gas Regulator

Back 1293

A pressure regulator placed in a gas line between the service regulator and the appliance regulator.

Front 1294

Line Isolation Monitor

Back 1294

A test instrument designed to continually check the balanced and unbalanced impedance from each line of an isolated circuit to ground and equipped with a built-in test circuit to exercise the alarm without adding to the leakage current hazard.

Front 1295

Line Isolation Monitor

Back 1295

A test instrument designed to continually check the balanced and unbalanced impedance from each line of an isolated circuit to ground and equipped with a built-in test circuit to exercise the alarm without adding to the leakage current hazard. (ELS)

Front 1296

Line Pressure Regulator

Back 1296

A pressure regulator in accordance with the Standard for Line Pressure Regulators, ANSI Z-21.80/CSA 6.22, with no integral overpressure protection device for LP-Gas vapor service designed for installation inside a building to reduce a nominal 2 psig inlet pressure to 14 in. w.c. (4.0 kPa) or less.

Front 1297

Line Proportioner

Back 1297

This system uses a venturi pickup-type device where water passing through the unit creates a vacuum, thereby allowing foam concentrate to be picked up from an atmospheric storage container.

Front 1298

Liner

Back 1298

An inner component of a helmet or garment designed to provide warmth.

Front 1299

Line Rocket

Back 1299

A pyrotechnic device guided along a wire or cable.

Front 1300

Liner System

Back 1300

The moisture barrier and thermal barrier components as used in a garment.

Front 1301

Line Supervision

Back 1301

Automatic monitoring of circuits and other system components for the existence of defects or faults that interfere with receiving or transmitting an alarm.

Front 1302

Line-Type Detector

Back 1302

A device in which detection is continuous along a path. Typical examples are rate-of-rise pneumatic tubing detectors, projected beam smoke detectors, and heat-sensitive cable. [72, 2007]

Front 1303

Line-Type Detector

Back 1303

A device in which detection is continuous along a path. Typical examples are rate-of-rise pneumatic tubing detectors, projected beam smoke detectors, and heat-sensitive cable. (SIG-IDS)

Front 1304

Line Voltage Circuit, Equipment, or System

Back 1304

An ac or dc electrical circuit, equipment, or system where the voltage to ground or from line to line is 30 volts (V) rms (ac) or 42.4 V peak (dc) or greater. [1901, 2003]

Front 1305

Line Voltage Circuit, Equipment, or System

Back 1305

An ac or dc electrical circuit, equipment, or system where the voltage to ground or from line to line is 30 V rms (ac), 42.4 V peak (ac), or 60
V dc; or greater.

Front 1306

Line Voltage Conductor

Back 1306

An ungrounded current-carrying conductor of a line voltage circuit.

Front 1307

Lining

Back 1307

Any material that is attached and used to cover or partially cover the inside surface of a flame-resistant garment.

Front 1308

Lining

Back 1308

Any material that is permanently attached and used to cover or partially cover the inside surface area of a protective garment.

Front 1309

Lining

Back 1309

Structural components, such as suspended ceilings or curtain bulkheads, which are non-load bearing or used for aesthetic purposes.

Front 1310

Link Load

Back 1310

The number of passengers traveling between two stations on board a train or trains.

Front 1311

Lintel

Back 1311

A horizontal member spanning and carrying the load above an opening.

Front 1312

Lip Collapse

Back 1312

A collapse of the trench lip, usually subsequent to surcharge loading, impact damage from the excavating bucket, and/or inherent cohesive properties of the soil type.

Front 1313

Lip (Trench Lip)

Back 1313

The area 0.61 m horizontal and 0.61 m vertical (2 ft × 2 ft) from the top edge of the trench face.

Front 1314

Liquefied Compressed Gases

Back 1314

Gases that are contained in a packaging under the charged pressure and are partially liquid at a temperature of 68°F (20°C).

Front 1315

Liquefied Gas

Back 1315

A gas, other than in solution, that in a packaging under the charged pressure exists both as a liquid and a gas at a temperature of 68°F (20°C).

Front 1316

Liquefied Gas

Back 1316

A gas, other than in solution, that in a packaging under the charged pressure exists both as a liquid and a gas at a temperature of 68°F (20°C). [30, 2008]

Front 1317

Liquefied Gas

Back 1317

A gas that, under its charged pressure, is partially liquid at 21°C (70°F).

Front 1318

Liquefied Gas

Back 1318

A gas that, under its charged pressure, is partially liquid at 70°F (21°C).

Front 1319

Liquefied Gas Cylinder

Back 1319

A compressed gas cylinder used for liquefied gas.

Front 1320

Liquefied Hydrogen System

Back 1320

A system into which liquefied hydrogen is delivered and stored and from which it is discharged in the liquid or gaseous form to a piping system. The system originates at the storage container fill connection and terminates at the point where hydrogen at service pressure first enters the supply line.

Front 1321

Liquefied Natural Gas (LNG)

Back 1321

A fluid in the cryogenic liquid state that is composed predominantly of methane.

Front 1322

Liquefied Natural Gas (LNG)

Back 1322

A fluid in the cryogenic liquid state that is composed predominantly of methane and that can contain minor quantities of ethane, propane, nitrogen, and other components normally found in natural gas.

Front 1323

Liquefied Natural Gas (LNG)

Back 1323

A fluid in the cryogenic liquid state that is composed predominantly of methane and that can contain minor quantities of ethane, propane, or nitrogen. [52, 2008]

Front 1324

Liquefied Petroleum Gas
(LPG)

Back 1324

Terms “liquefied petroleum gas,” “LP-Gas,” and “LPG” that are synonymous and include any product composed predominantly of any of the following gaseous hydrocarbons: propane, propylene, butane, isobutane, butylenes, or a mixture thereof.

Front 1325

Liquefied Petroleum Gas
(LP-Gas)

Back 1325

Any material having a vapor pressure not exceeding that allowed for commercial propane that is composed predominantly of the following hydrocarbons, either by themselves or as mixtures: propane, propylene, butane (normal butane or isobutane), and butylenes.

Front 1326

Liquefied Petroleum Gas
(LP-Gas)

Back 1326

Any material having a vapor pressure not exceeding that allowed for commercial propane that is composed predominantly of the following hydrocarbons, either by themselves or as mixtures: propane, propylene, butane (normal butane or isobutane), and butylenes. [58,
2008]

Front 1327

Liquid

Back 1327

A material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials. Unless otherwise specified, the term liquid includes both flammable and combustible liquids.

Front 1328

Liquid

Back 1328

A material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test
Method of Penetration of Bituminous Materials. Unless otherwise specified, the term liquid includes both flammable and combustible liquids.

Front 1329

Liquid

Back 1329

A material that has a melting point that is equal to or less than 68°F (20°C) and a boiling point that is greater than 68°F (20°C) at 14.7 psia (101.3 kPa). When not otherwise identified, the term liquid shall mean both flammable and combustible liquids.

Front 1330

Liquid

Back 1330

A material that has a vapor pressure not exceeding 40 psia
(2068.6 mm Hg) at 100°F (37.8°C).

Front 1331

Liquid

Back 1331

Any material that (1) has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Method of Test for Penetration of Bituminous Materials or (2) is a viscous substance for which a specific melting point cannot be determined but that is determined to be a liquid in accordance with ASTM D 4359, Standard Test for Determining Whether a Material is a Liquid or a Solid. [30, 2008]

Front 1332

Liquid

Back 1332

Any material that (1) has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials, or (2) is a viscous substance for which a specific melting point cannot be determined but that is determined to be a liquid in accordance with ASTM D 4359, Standard Test for Determining Whether a Material is a Liquid or a Solid.

Front 1333

Liquid

Back 1333

Any material that (1) has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials, or (2) is a viscous substance for which a specific melting point cannot be determined but that is determined to be a liquid in accordance with ASTM D 4359, Standard Test for Determining Whether a Material Is a Liquid or a Solid. [30, 2008]

Front 1334

Liquid

Back 1334

Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Method of Test for Penetration of Bituminous Materials. [30, 2003]

Front 1335

Liquid

Back 1335

Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials.

Front 1336

Liquid

Back 1336

Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials. [30, 2003]

Front 1337

Liquid

Back 1337

Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standard Test Method for Penetration of Bituminous Materials. [30, 2003] (LAB)

Front 1338

Liquid

Back 1338

Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Test for Penetration for Bituminous Materials.

Front 1339

Liquid

Back 1339

For the purposes of this standard, liquid refers to water, foam-water solution, foam concentrates, water additives, or other liquids for fire protection purposes.

Front 1340

Liquid-Borne Pathogen

Back 1340

An infectious bacteria or virus carried in human, animal, or clinical body fluids, organs, or tissues.

Front 1341

Liquid Fuel Tank

Back 1341

A fuel tank designed to contain a fuel that is liquid at normal atmospheric pressures and temperatures.

Front 1342

Liquid Oxygen

Back 1342

Exists at cryogenic temperature, approximately -184.4°C (-300°F) at atmospheric pressure. It retains all of the properties of gaseous oxygen, but, in addition, when allowed to warm to room temperature at atmospheric pressure, it will evaporate and expand to fill a volume
860 times its liquid volume. (GAS)

Front 1343

Liquid Penetrant Inspection

Back 1343

A nondestructive inspection method used to locate and determine the severity of surface discontinuities in materials, based on the ability of a liquid to penetrate into small openings, such as cracks.

Front 1344

Liquid Seal

Back 1344

A device that prevents the passage of flame by passing the gas mixture through a noncombustible liquid.

Front 1345

Liquid Splash-Protective
Clothing

Back 1345

Multiple items of compliant protective clothing and equipment products that provide protection from some risks, but not all risks, of hazardous materials emergency incident operations involving liquids.

Front 1346

Liquid Splash-Protective
Clothing

Back 1346

The garment portion of a chemical-protective clothing ensemble that is designed and configured to protect the wearer against chemical liquid splashes but not against chemical vapors or gases.

Front 1347

Liquid Splash-Protective
Ensemble

Back 1347

Multiple elements of compliant protective clothing and equipment products that when worn together provide protection from some risks, but not all risks, of hazardous materials emergency incident operations involving liquids.

Front 1348

Liquid Splash-Protective
Footwear

Back 1348

The element of the protective ensemble, or the item of protective clothing that provides liquid chemical protection and physical protection to the feet, ankles, and lower legs.

Front 1349

Liquid Splash-Protective
Garment

Back 1349

The element of the protective ensemble, or the item of protective clothing that provides liquid chemical protection to the upper and lower torso, arms and legs, excluding the head, hands, and feet.

Front 1350

Liquid Splash-Protective Glove

Back 1350

The element of the protective ensemble, or the item of protective clothing that provides liquid chemical protection to the hands and wrists.

Front 1351

Liquid Storage Room

Back 1351

A room that is used for the storage of liquids in containers, portable tanks, or intermediate bulk containers, has a floor area that does not exceed 500 ft2, and might be totally enclosed within a building — that is, the room might have no exterior walls.

Front 1352

Liquid Storage Room

Back 1352

A room used for the storage of flammable or combustible liquids in a closed condition that satisfies the requirements of this Code for high hazard Level 3 contents.

Front 1353

Liquid Surge

Back 1353

The force imposed upon a fire apparatus by the contents of a partially filled water or foam concentrate tank when the vehicle is accelerated, decelerated, or turned.

Front 1354

Liquidtight

Back 1354

Constructed and performing in such a manner as not to permit the passage of any liquid at any temperature.

Front 1355

Liquidtight

Back 1355

The ability of an enclosure or device to prevent the unintended release of liquids at normal operating temperature and pressure ranges.

Front 1356

Liquidtight Flexible Metal
Conduit (LFMC)

Back 1356

A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors.

Front 1357

Liquidtight Flexible Metal
Conduit (LFMC)

Back 1357

A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors. [70:350.2]

Front 1358

Liquidtight Flexible Nonmetallic Conduit (LFNC)

Back 1358

A raceway of circular cross section of various types as follows:

Front 1359

Liquidtight Flexible Nonmetallic Conduit (LFNC)

Back 1359

A raceway of circular cross section of various types as follows: (1) A smooth seamless inner core and cover bonded together and having one or more reinforcement layers between the core and covers, designated as Type LFNC-A; (2) A smooth inner surface with integral reinforcement within the conduit wall, designated as Type LFNC-B; (3) A corrugated internal and external surface without integral reinforcement within the conduit wall, designated as LFNC-C. LFNC is flame resistant and with fittings and is approved for the installation of electrical conductors. [70:356.2]

Front 1360

Liquid Warehouse

Back 1360

A separate, detached building or an attached building that is used for warehousing-type operations for liquids and whose exterior wall comprises at least 25 percent of the building perimeter.

Front 1361

Liquid Warehouse

Back 1361

A separate, detached building or an attached building that is used for warehousing-type operations for liquids and whose exterior wall comprises at least 25 percent of the building perimeter. [30, 2008]

Front 1362

Liquid Waste

Back 1362

The discharge from any fixture, appliance, area, or appurtenance that does not contain body waste.

Front 1363

List

Back 1363

An inclination to one side; a tilt.

Front 1364

List

Back 1364

The continuous lean or tilt of a vessel to one side due to an imbalance of weight within the vessel.

Front 1365

Listed

Back 1365

Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose.

Front 1366

Listed

Back 1366

Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or services meets appropriate designated standards or has been tested and found suitable for a specified purpose.

Front 1367

Listed

Back 1367

The means for identifying listed equipment may vary for each organization concerned with product evaluation; some organizations do not recognize equipment as listed unless it is also labeled. The authority having jurisdiction should utilize the system employed by the listing organization to identify a listed product.

Front 1368

Listing Agency

Back 1368

An organization acceptable to the authority having jurisdiction and concerned with product evaluation that maintains periodic inspection of production of listed equipment or materials and whose listing states that the equipment or material either meets appropriate standards or has been tested and found suitable for use in a specified manner.

Front 1369

Lithium-Ion Battery

Back 1369

A storage battery that consists of lithium ions imbedded in a carbon graphite or nickel metal-oxide substrate. The electrolyte is a carbonate mixture or a gelled polymer. The lithium ions are the charge carriers of the battery.

Front 1370

Lithium Metal Polymer Battery

Back 1370

A storage battery that is comprised of nonaqueous liquid or polymerized electrolytes, which provide ionic conductivity between lithiated positive active material electrically separated from metallic lithium or lithiated negative active material.

Front 1371

Litter

Back 1371

A transfer device designed to support and protect a victim during movement.

Front 1372

Litter

Back 1372

A transfer device designed to support and protect a victim during movement. [1670, 2004]

Front 1373

Litter Attendant

Back 1373

A person who both accompanies and physically manages the litter.

Front 1374

Litter Tender

Back 1374

A rescuer designated to manage a litter and/or person packaged in a litter during a rope rescue operation.

Front 1375

Live Fire

Back 1375

Any unconfined open flame or device that can propagate fire to the building or other combustible materials. [1403, 2002]

Front 1376

Live Fire

Back 1376

Any unconfined open flame or device that can propagate fire to the building, structure, or other combustible materials.

Front 1377

Live Fire Training Structure

Back 1377

A structure specifically designed for conducting live fire training evolutions on a repetitive basis.

Front 1378

Live Load

Back 1378

Forces acting on the aerial device from personnel, portable equipment, water, and nozzle reaction.

Front 1379

Live Loads

Back 1379

Live loads are those loads produced by the use and occupancy of the building or other structure and do not include construction or environmental loads such as wind load, snow load, rain load, earthquake load, flood load, or dead load. Live loads on a roof are those produced (1) during maintenance by workers, equipment, and materials; and (2) during the life of the structure by movable objects such as planters and by people. [ASCE/SEI 7:4.1]

Front 1380

Live Parts

Back 1380

Energized conductive components.

Front 1381

Live Parts

Back 1381

Energized conductive components. [70:100]

Front 1382

Live Parts

Back 1382

Energized conductive components. [70, 2008]

Front 1383

Living Area

Back 1383

Any normally occupiable space in a residential occupancy, other than sleeping rooms or rooms that are intended for combination sleeping/living, bathrooms, toilet compartments, kitchens, closets, halls, storage or utility spaces, and similar areas.

Front 1384

Living Area

Back 1384

Any normally occupiable space in a residential occupancy, other than sleeping rooms or rooms that are intended for combination sleeping/living, bathrooms, toilet compartments, kitchens, closets, halls, storage or utility spaces, and similar areas. [101, 2006]
(SIG-HOU)

Front 1385

L/min

Back 1385

Liters per minute.

Front 1386

LNG Plant

Back 1386

A facility whose components can be used to store, condition, liquefy, or vaporize natural gas.

Front 1387

Load

Back 1387

That which is being lowered or raised by rope in a high-angle system.

Front 1388

Load Bearing Attachment
Point

Back 1388

Point on a harness, or escape belt that is used for connection to an anchor system that will provide full support and fall arrest for the designed load.

Front 1389

Load Bearing Connector

Back 1389

An auxiliary equipment system component; a device used to join other system components including but not limited to carabiners, rings, quick links, and snap-links.

Front 1390

Load-Bearing Element

Back 1390

Any column, girder, beam, joist, truss, rafter, wall, floor, or roof sheathing that supports any vertical load in addition to its own weight, or any lateral load.

Front 1391

Load-Bearing Element

Back 1391

Any column, girder, beam, joist, truss, rafter, wall, floor, or roof sheathing that supports any vertical load in addition to its own weight, or any lateral load. [5000, 2009]

Front 1392

Loaded Stream Charge

Back 1392

A water-based extinguishing medium that uses an alkali metal salt as a freezing point depressant.

Front 1393

Load Effects

Back 1393

Forces and deformations produced in structural members by the applied loads. [ASCE/SEI 7:1.2]

Front 1394

Loader

Back 1394

An assistant who loads or reloads aerial shells, comets, or mines into mortars.

Front 1395

Load Factor

Back 1395

A factor that accounts for deviations of the actual load from the nominal load, for uncertainties in the analysis that transforms the load into a load effect, and for the probability that more than one extreme load will occur simultaneously. [ASCE/SEI 7:1.2]

Front 1396

Loading Capacity

Back 1396

The maximum number of discrete elements of fire alarm systems permitted to be used in a particular configuration. (SIG-SSS)

Front 1397

Load Limit Indicator

Back 1397

A load indicator or a label, visible at the operator’s position, that shows the recommended safe load at any condition of an aerial device’s elevation and extension.

Front 1398

Load Limit Indicator

Back 1398

A load indicator or an instruction plate, visible at the operator’s position, that shows the recommended safe load at any condition of an aerial device’s elevation and extension. [1901, 2003]

Front 1399

Load (Mass)

Back 1399

That which is being lowered, raised, or otherwise supported by a rope rescue system. Relative to rope rescue qualification, a minimum weight of 45.5 kg (100 lb).

Front 1400

Loads

Back 1400

Forces or other actions that result from the weight of all building materials, occupants and their possessions, environmental effects, differential movement, and restrained dimensional changes. Permanent loads are those loads in which variations over time are rare or of small magnitude. All other loads are variable loads. (See also
3.3.414, Nominal Loads.) [ASCE/SEI 7:1.2]

Front 1401

Load Stabilization

Back 1401

The process of preventing a load from shifting in any direction.

Front 1402

Load Test

Back 1402

A method of preloading a rope rescue system to ensure all components are set properly to sustain the expected load.

Front 1403

Lobby

Back 1403

An enclosed vestibule directly accessible from the main entrance of a theater, hotel, apartment house, or similar building with an occupant load of 10 or more.

Front 1404

Local Alarm

Back 1404

An alarm that annunciates at the protected premises.

Front 1405

Local Alarm System

Back 1405

A warning system that provides continuous visible and audible surveillance of medical gas and vacuum system source equipment at the equipment site. (PIP)

Front 1406

Local Application System

Back 1406

A supply of dry chemical permanently connected to fixed piping with nozzles arranged to discharge directly onto the fire.

Front 1407

Local Application System

Back 1407

A system consisting of a supply of extinguishing agent arranged to discharge directly on the burning material.

Front 1408

Local Application System

Back 1408

A system consisting of a supply of extinguishing agent arranged to discharge directly on the burning material. [12, 2008]

Front 1409

Local-Application Water Mist
System

Back 1409

A water mist system arranged to discharge directly on an object or hazard in an enclosed, unenclosed, or open outdoor condition.

Front 1410

Local Circuit

Back 1410

A circuit that does not depend on the receipt of alarms over box circuits or the retransmission of alarms over dispatch circuits.

Front 1411

Local Control

Back 1411

The point of control of the emergency ventilation system or ventilation plant that is remote from the central supervising station.

Front 1412

Local Energy Type Auxiliary
Fire Alarm System

Back 1412

An auxiliary system that employs a locally complete arrangement of parts, initiating devices, relays, power supply, and associated components to automatically activate a master box or auxiliary box over circuits that are electrically isolated from the public fire alarm reporting system circuits. (SIG-PRS)

Front 1413

Local Signal

Back 1413

A visible indication of the operating status of equipment. (PIP)

Front 1414

Local Ventilation

Back 1414

A ventilation system whose exhaust inlet is located close to the point of vapor release so as to remove the vapor from the point of release.

Front 1415

Locating Devices

Back 1415

Devices utilized to locate victims in rescue incidents and structural components, including but not limited to voice, seismic, video, K-9, and fiber optic.

Front 1416

Location Board (Deuce Board)

Back 1416

Portable equipment containing a lighting contactor or contactors and overcurrent protection designed for remote control of stage lighting.

Front 1417

Location, Damp

Back 1417

Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.

Front 1418

Location, Dry

Back 1418

A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction.

Front 1419

Location (Shooting Location)

Back 1419

A place outside a motion picture studio where a production or part of it is filmed or recorded.

Front 1420

Location, Wet

Back 1420

Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.

Front 1421

Lock Box

Back 1421

A locked container often used to store building entry keys, plans, and related data.

Front 1422

Locked Rotor Current

Back 1422

The steady-state current taken from the line with the rotor locked and with rated voltage (and rated frequency in the case of
alternating-current motors) applied to the motor.

Front 1423

Lock Hopper

Back 1423

A feeding device that incorporates a double pressure seal, thus enabling solids to be fed into a system with a higher pressure than the pressure existing in the solid’s storage area. Also, a letdown device
that incorporates a double pressure seal, thus enabling solids to be withdrawn from a system with a higher pressure than that existing downstream of the lock hopper.

Front 1424

Lockout

Back 1424

A manually operated valve in the discharge pipe between the nozzles and the supply, which can be locked in the closed position to prevent flow of carbon dioxide to the protected area.

Front 1425

Lockout

Back 1425

A method for keeping equipment from being set in motion and endangering workers.

Front 1426

Lockout Valve

Back 1426

A manually operated valve in the discharge pipe between the nozzles and the agent supply that can be locked in the closed position to prevent flow of agent to the protected area.

Front 1427

Lock-Up

Back 1427

An incidental use area in other than a detention and correctional occupancy where occupants are restrained and such occupants are mostly incapable of self-preservation because of security measures not under the occupants’ control.

Front 1428

Lodging or Rooming House

Back 1428

A building or portion thereof that does not qualify as a one- or
two-family dwelling, that provides sleeping accommodations for a total
of 16 or fewer people on a transient or permanent basis, without
personal care services, with or without meals, but without separate
cooking facilities for individual occupants.

Front 1429

Lodging or Rooming House

Back 1429

A building or portion thereof that does not qualify as a one- or
two-family dwelling, that provides sleeping accommodations for a total
of 16 or fewer people on a transient or permanent basis, without
personal care services, with or without meals, but without separate
cooking facilities for individual occupants. [101, 2006] (SIG-HOU)

Front 1430

Lodging or Rooming House

Back 1430

A building or portion thereof that does not qualify as a one- or
two-family dwelling, that provides sleeping accommodations for a total
of 16 or fewer people on a transient or permanent basis, without
personal care services, with or without meals, but without separate
cooking facilities for individual occupants. [101, 2009]

Front 1431

Lodging or Rooming House

Back 1431

A building or portion thereof that does not qualify as a one- or
two-family dwelling, that provides sleeping accommodations for a total
of 16 or fewer people on a transient or permanent basis, without
personal care services, with or without meals, but without separate
cooking facilities for individual occupants. [101:3.3]

Front 1432

Log

Back 1432

Felled tree from which all the branches have been removed.

Front 1433

Logging Voice Recorder

Back 1433

A device that records voice conversations and automatically logs the time and date of such conversations; normally, a multichannel device that keeps a semi-permanent record of operations.

Front 1434

Logic System

Back 1434

The decision-making and translation elements of the burner management system. A logic system provides outputs in a particular sequence in response to external inputs and internal logic. Logic systems are comprised of the following: (1) hardwired systems — individual devices and interconnecting wiring — and (2) microprocessor-based systems — (a) computer hardware, power supplies, I/O devices, and the interconnections among them; and (b) operating system and logic software.

Front 1435

Logistics

Back 1435

The incident management section responsible for providing facilities, services, and materials for the incident.

Front 1436

Logistics Section

Back 1436

Section responsible for providing facilities, services, and materials for the incident or planned event, including the communications unit, medical unit, and food unit within the service branch and the supply unit, facilities unit, and ground support unit within the support branch.

Front 1437

Long Duration Undervoltage

Back 1437

A decrease of the supply voltage to less than 90 percent of the nominal voltage for a time duration greater than 1 minute. [See IEEE
1159, Recommended Practice on Monitoring Electric Power Quality, Table
4-2.]

Front 1438

Longitudinal Brace

Back 1438

A sway brace intended to resist differential movement parallel to the axis of the pipe.

Front 1439

Longitudinal Flue Space

Back 1439

The space between rows of storage perpendicular to the direction of loading. (See Figure A.3.9.3.6.)

Front 1440

Long-Time Rating

Back 1440

A rating based on an operating interval of 5 minutes or longer.

Front 1441

Lookout

Back 1441

A person designated to observe the fire or a portion of a fire and warn the crew when there is a change in fire activity or when there is
danger of becoming trapped.

Front 1442

Loop Conductor

Back 1442

A conductor encircling a structure that is used to interconnect grounding electrodes, main conductors, or other electrically conductive bodies.

Front 1443

Looped Sprinkler System

Back 1443

A sprinkler system in which multiple cross mains are tied together so as to provide more than one path for water to flow to an operating sprinkler and branch lines are not tied together.

Front 1444

Loose House

Back 1444

A separate detached building in which unbaled combustible fibers are stored.

Front 1445

Loss

Back 1445

The unintentional decline in or disappearance of value arising from an incident.

Front 1446

Loss of Phase

Back 1446

The loss of one or more, but not all, phases of the polyphase power source.

Front 1447

Loss of Power

Back 1447

The reduction of available voltage at the load below the point at which equipment can function as designed. (SIG-FUN)

Front 1448

Lot

Back 1448

Smallest parcel of land considered as a unit.

Front 1449

Loudspeaker

Back 1449

Equipment that converts an ac electric signal into an acoustic signal. The term speaker is commonly used to mean loudspeaker.

Front 1450

Low Angle

Back 1450

Refers to an environment in which the load is predominantly supported by itself and not the rope rescue system (e.g., flat land or mild sloping surface).

Front 1451

Low Angle

Back 1451

Refers to an environment in which the load is predominantly supported by itself and not the rope rescue system (e.g., flat land or mild sloping surface). [1670, 2004]

Front 1452

Low Emission Transfer

Back 1452

Establishes a maximum fugitive emissions standard for certain product transfer operations. Low emission transfer specifications might be employed to comply with environmental regulations or to determine certain minimum distance requirements.

Front 1453

Low-Energy Foam System

Back 1453

A device or system that uses only energy produced by the velocity of the water stream to create foam.

Front 1454

Lower Body

Back 1454

The area of the body below the waist including the legs but excluding the ankles and feet.

Front 1455

Lower Explosive Limit or
Lower Flammable Limit

Back 1455

The minimum concentration of combustible vapor or combustible gas in a mixture of the vapor or gas and gaseous oxidant above which propagation of flame will occur on contact with an ignition source.

Front 1456

Lower Flammability Limit (LFL)

Back 1456

That concentration of a combustible material in air below which ignition will not occur.

Front 1457

Lower Flammable Limit (LFL)

Back 1457

For purposes of tank entry, cleaning, or repair, the concentration of a flammable gas or flammable vapor, expressed as a volume percent in air, below which propagation of a flame does not occur upon contact with an ignition source, when tested in accordance with ASTM E 681, Standard Test Method for Concentration Limits of Flammability of Chemicals (Vapors and Gases).

Front 1458

Lower Flammable Limit (LFL)

Back 1458

That concentration of a combustible material in air below which ignition will not occur. [329:1.2]

Front 1459

Lower Flammable Limit (LFL)

Back 1459

That concentration of a combustible material in air below which ignition will not occur. Also known as the lower explosive limit (LEL).

Front 1460

Lower Flammable Limit (LFL)

Back 1460

That concentration of a combustible material in air below which ignition will not occur. Also known as the lower explosive limit (LEL). [329, 2005]

Front 1461

Lower Flammable Limit (LFL)

Back 1461

That concentration of a combustible material in air below which ignition will not occur. Also known as the Lower Explosive Limit (LEL). Mixtures below this limit are said to be “too lean.” [329:1.2]

Front 1462

Lower Flammable Limit (LFL)

Back 1462

The concentration of a combustible material in air below which ignition will not occur.

Front 1463

Lower Flammable Limit (LFL)

Back 1463

The lowest concentration of a combustible substance in a gaseous oxidizer that will propagate a flame, under defined test conditions.

Front 1464

Lower Flammable Limit (LFL)

Back 1464

The lowest concentration of a combustible substance in an oxidizing medium that will propagate a flame.

Front 1465

Lower Flammable Limit (LFL)

Back 1465

The lowest concentration of a flammable gas/vapor in air in which flame is propagated.

Front 1466

Lower Flammable Limit (LFL)

Back 1466

The lowest concentration of material that will propagate a flame from an ignition source through a mixture of flammable gas or combustible dust dispersion with a gaseous oxidizer.

Front 1467

Lowering System

Back 1467

A rope rescue system used to lower a load under control.

Front 1468

Lowering System

Back 1468

A rope rescue system used to lower a load under control. [1670, 2004]

Front 1469

Lower Torso

Back 1469

The area of the body trunk below the waist, excluding the legs, ankles and feet.

Front 1470

Lowest Floor

Back 1470

The floor of the lowest enclosed area of a manufactured home. For the purpose of this standard, lowest floor shall mean the bottom of the longitudinal chassis frame beam in A zones, and the bottom of the lowest horizontal structural member supporting the home in V zones. An unfinished or flood-resistant enclosure, used solely for vehicle parking, home access or limited storage, shall not be considered the lowest floor, provided the enclosed area is not constructed so as to render the home in violation of the flood-related provisions of this standard.

Front 1471

Lowest Floor (Flood
Resistance)

Back 1471

For all matters related to flood-resistant design and construction, the floor of the lowest enclosed area of a building or structure. An unfinished or flood-resistant enclosure used solely for vehicle parking, building access, or limited storage shall not be considered the lowest floor, provided the enclosed area is not constructed so as to render
the building or structure in violation of the flood-related provisions of
Chapter 39.

Front 1472

Lowest Observable Adverse
Effect Level (LOAEL)

Back 1472

The lowest concentration at which an adverse physiological or toxicological effect has been observed.

Front 1473

Lowest Pulling Force (LPF)

Back 1473

The pulling force that is achieved by the powered rescue tool while operating at the rated system input at the position of the arms or piston where the tool generates its least amount of force.

Front 1474

Lowest Spreading Force (LSF)

Back 1474

The spreading force that is achieved by the powered rescue tool while operating at the rated system input at the position of the arms or piston where the tool generates its least amount of force.

Front 1475

Low-Expansion Foam

Back 1475

Foams with expansion ratios up to 20:1.

Front 1476

Low Explosive

Back 1476

An explosive that has a reaction velocity of less than 1000 m/sec
(3000 ft/sec).

Front 1477

Low Explosive

Back 1477

Explosive materials that can be caused to deflagrate when confined (e.g., Black Powder, safety fuses, igniters, igniter cords, fuse lighters, and display fireworks defined as low explosives by U.S. Department of Transportation regulations in 49 CFR 173 except for bulk salutes).

Front 1478

Low Explosive Material

Back 1478

Explosive material that is characterized by deflagration or a low rate of reaction and the development of low pressure.

Front 1479

Low Explosive (Material)

Back 1479

Explosive material that will burn or deflagrate when ignited.

Front 1480

Low Fire

Back 1480

The minimum fire rate that results in stable combustion.

Front 1481

Low Flame Spread Rating

Back 1481

A flame spread rating of 25 or less.

Front 1482

Low Fuel Pressure Switch

Back 1482

A pressure-activated switch arranged to effect a safety shutdown of the burner system in the event of abnormally low fuel pressure.

Front 1483

Low Hazard

Back 1483

Contents of such low combustibility that no self-propagating fire therein can occur.

Front 1484

Low Hazard Contents

Back 1484

Contents of such low combustibility that no self-propagating fire therein can occur. [5000: 6.3.2.2]

Front 1485

Low Hazard Contents

Back 1485

Contents that are of such low combustibility that no self-propagating fire therein can occur. [5000:6.3.2.2]

Front 1486

Low-Location Lighting

Back 1486

Electrically powered lighting or photoluminescent indicators placed at points of the escape route to readily identify all routes of escape.

Front 1487

Low Melting Point Materials

Back 1487

Ductile materials such as aluminum, copper, and brass, nonductile materials such as cast iron, and rigid and nonrigid polymeric materials such as plastic and fiberglass-reinforced plastic that soften on
exposure to fire and that are partially or completely consumed by fire.

Front 1488

Low-Order Damage

Back 1488

A slow rate of pressure rise or low-force explosion characterized by a pushing or dislodging effect on the confining structure or container and by short missile distances.

Front 1489

Low-Oxygen Oven

Back 1489

An oven that utilizes a low-oxygen atmosphere to evaporate solvent to facilitate solvent recovery.

Front 1490

Low-Power Radio Transmitter

Back 1490

Any device that communicates with associated control/receiving equipment by low-power radio signals. (SIG-PRO)

Front 1491

Low Pressure

Back 1491

Indicates that the carbon dioxide is stored in pressure containers at a controlled low temperature of 0°F (-18°C).

Front 1492

Low-Pressure Acetylene

Back 1492

Acetylene at a gauge pressure not exceeding 6.9 kPa (1 psi).

Front 1493

Low Pressure Acetylene

Back 1493

Acetylene at a pressure not exceeding a gauge pressure of 1 psi (6.9 kPa).

Front 1494

Low-Pressure Boiler

Back 1494

A boiler for generating steam at gauge pressures not in excess of 15 psi (103 kPa) or for furnishing water at a maximum temperature of
250°F (121°C) at a maximum gauge pressure of 160 psi (1103 kPa).

Front 1495

Low Pressure Boiler

Back 1495

A boiler for generating steam at pressures not in excess of 15 psi (gauge pressure of 103 kPa) or for furnishing water at a maximum temperature of 250°F (121°C) at a maximum gauge pressure of 160 psi (gauge pressure of 1100 kPa).

Front 1496

Low-Pressure Boiler

Back 1496

A boiler that supplies steam at a pressure not exceeding 15 psi (100 kPa), or hot water at a pressure not exceeding 160 psi (1100 kPa) at a temperature not exceeding 250°F (121°C).

Front 1497

Low-Pressure Cylinder

Back 1497

Cylinders containing fire-extinguishing agent (medium), nitrogen, compressed air, or other compressed gases at a service pressure of 500 psi (3447 kPa) or lower at 70°F (21°C).

Front 1498

Low Pressure or Atmospheric
Fuel Gas System

Back 1498

A fuel gas system using the kinetic energy of a jet of less than 1 psig (7 kPa) gas pressure to entrain from the atmosphere a portion of the air required for combustion.

Front 1499

Low-Pressure Oxygen
Manifold

Back 1499

A manifold connecting oxygen containers having a DOT service gauge pressure not exceeding 1.7 MPa (250 psi).

Front 1500

Low Pressure System

Back 1500

A water mist system where the distribution piping is exposed to pressures of 12.1 bar (175 psi) or less.

Front 1501

Low Pressure Tank

Back 1501

A storage tank designed to withstand an internal pressure above 0.5 psig (3.5 kPa) but not more than 15 psig (102.4 kPa).

Front 1502

Low Pressure Tank

Back 1502

A storage tank designed to withstand an internal pressure above 3.5 kPa (0.5 psig) but not more than 102.4 kPa (15 psig).

Front 1503

Low-Pressure Tank

Back 1503

For the purposes of this code, a storage tank designed to withstand an internal pressure above a gauge pressure of 1.0 psi (6.9 kPa) but not more than a gauge pressure of 15 psi (103 kPa) measured at the top
of the tank.

Front 1504

Low-Risk Fuel

Back 1504

All other fuels that are not high risk.

Front 1505

Low-Static Pressure-Type Unit
Heater

Back 1505

A self-contained, automatically controlled, vented, fuel gas burning appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air, normally by a propeller fan(s), and may be equipped with louvers or face extensions made in accordance with the manufacturer’s
specifications.

Front 1506

Low Suction Throttling Valve

Back 1506

A pilot-operated valve installed in discharge piping that maintains positive pressure in the suction piping, while monitoring pressure in the suction piping through a sensing line.

Front 1507

Low Vacuum

Back 1507

A vacuum with a pressure between 760 torr and 1 × 10-3 torr
(millimeters of mercury).

Front 1508

Low Voltage

Back 1508

An electromotive force rated 24 volts, nominal, or less, supplied from a transformer, converter, or battery.

Front 1509

Low-Voltage Circuit, Equipment, or System

Back 1509

An electrical circuit, equipment, or system where the voltage does not exceed 30 volts (V) rms (ac) or 42.4 V peak (dc).

Front 1510

Low-Voltage Circuit, Equipment, or System

Back 1510

An electrical circuit, equipment, or system where the voltage does not exceed 30 volts (V) rms (ac) or 42.4 V peak (dc), usually 12 V dc in fire apparatus. [1901, 2003]

Front 1511

Low Voltage Circuit, Equipment, or System

Back 1511

An electrical circuit, equipment, or system where the voltage does not exceed 30 V rms (ac), 42.4 V peak (ac), or 60 V dc; usually 12 V dc in fire apparatus.

Front 1512

Low Water Level

Back 1512

A tidal datum that is a long-term arithmetic mean of the named tidal levels as promulgated for a given location in the tables and charts of the National Ocean Survey of the National Oceanic and Atmospheric Administration.

Front 1513

LP-Gas

Back 1513

A material that is composed predominantly of any of the following hydrocarbons or mixtures of them: propane, propylene, n-butane, isobutane, and butylenes.

Front 1514

LP-Gas Container

Back 1514

Any vessel, including cylinders, tanks, portable tanks, and cargo tanks, used for the transporting or storing of LP-Gases. [58, 2008]

Front 1515

LP-Gas System

Back 1515

An assembly consisting of one or more containers with a means for conveying LP-Gas from a container to dispensing or consuming devices that incorporates components that control the quantity, flow, pressure, and physical state (liquid or vapor) of the LP-Gas.

Front 1516

Lumber

Back 1516

Wood from felled trees having a section produced by lengthwise sawing or chipping of logs or other solid wood of large dimensions and possible crosscutting and/or further machining to obtain a certain size and includes boards, dimension lumber, timber, and similar wood products.

Front 1517

Lumber (Grade)

Back 1517

The classification of lumber in regard to strength and utility in accordance with USDOC PS 20 and the grading rules of an approved lumber rules-writing agency.

Front 1518

Luminaire

Back 1518

A complete lighting unit consisting of a lamp or lamps, together with the parts designed to distribute the light, to position and protect the lamps and ballast (where applicable), and to connect the lamps to the power supply. It may also include parts to protect the light source or the ballast or to distribute the light. A lampholder is not a luminaire. [70, 2008]

Front 1519

Luminaire

Back 1519

A complete lighting unit consisting of a light source such as a lamp or lamps, together with the parts designed to position the light source and connect it to the power supply. It may also include parts to
protect the light source or the ballast or to distribute the light. A
lampholder itself is not a luminaire.

Front 1520

Lumps

Back 1520

Agglomerations of dry chemical that do not crumble into particles when dropped from a height of 4 in. (101 mm) onto a hard surface.

Front 1521

mA

Back 1521

Milliampere.

Front 1522

Machine

Back 1522

A device in which one or more torches using fuel gas and oxygen are incorporated.

Front 1523

Machine Direction

Back 1523

In the case of nonwoven or film-type materials, that direction parallel to the longest dimension of the roll goods.

Front 1524

Machine Room (for Elevator, Dumbwaiter)

Back 1524

An enclosed machinery space outside the hoistway, intended for full bodily entry, that contains the electrical driving machine or the hydraulic machine. The room could also contain electrical and/or mechanical equipment used directly in connection with the elevator or dumbwaiter.

Front 1525

Machinery

Back 1525

The moving parts of a particular machine.

Front 1526

Machinery Space

Back 1526

A space containing the main and auxiliary propulsion machinery.

Front 1527

Machinery Space

Back 1527

A space protected by an aerosol system containing an internal combustion engine or mechanical equipment for handling, pumping, or transferring flammable or combustible liquids as a fuel to internal combustion engines.

Front 1528

Machinery Space

Back 1528

A space that contains mechanical equipment for handling, pumping, or transferring flammable or combustible liquids as a fuel.

Front 1529

Machinery Space

Back 1529

Spaces that contain permanently installed engines for mechanical or electrical power or propulsion.

Front 1530

Machinery Space (for Elevator, Dumbwaiter)

Back 1530

A space inside or outside the hoistway, intended to be accessed with or without full bodily entry, that contains elevator or dumbwaiter mechanical equipment, and could also contain electrical equipment used directly in connection with the elevator or dumbwaiter. This space could also contain the electrical driving machine or the hydraulic machine.

Front 1531

Magazine

Back 1531

A building or structure, other than an explosives manufacturing building, approved for the storage of explosive materials.

Front 1532

Magazine

Back 1532

A building or structure, other than an explosives manufacturing building, approved for the storage of explosive materials. [1124, 2006]

Front 1533

Magnesium

Back 1533

Refers to either pure metal or alloys having the generally recognized properties of magnesium marketed under different trade names and designations.

Front 1534

Magnesium Fines

Back 1534

The fraction of a magnesium powder that is 44 µm (microns) (320 mesh) or smaller in nominal diameter, either as a discrete particle or as agglomerates of discrete particles.

Front 1535

Magnesium Ribbon

Back 1535

Magnesium metal that is less than 3.2 mm (1⁄8 in.) in two dimensions or less than 1.3 mm (1⁄20 in.) in single dimension is considered a powder.

Front 1536

Magnetic Particle Inspection

Back 1536

A nondestructive inspection method used to locate discontinuities in ferromagnetic materials by magnetizing the material and then applying an iron powder to mark and interpret the patterns that form.

Front 1537

Main

Back 1537

The principal artery of the system to which branches may be connected.

Front 1538

Main Burner

Back 1538

A device or group of devices essentially forming an integral unit for the final conveyance of fuel or a mixture of fuel and air to the combustion zone and on which combustion takes place to accomplish the function for which the appliance is designed.

Front 1539

Main Burner

Back 1539

A device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone and on which combustion takes place to accomplish the function for which the appliance is designed.

Front 1540

Main Burner Flame
Establishing Period

Back 1540

The length of time fuel is permitted to be delivered to the main burner before the flame-sensing device is required to detect the main burner flame.

Front 1541

Main Conductor

Back 1541

A conductor intended to be used to carry lightning currents between strike termination devices and grounding electrodes.

Front 1542

Main Deck

Back 1542

The uppermost continuous deck of a ship that runs from bow to stern.

Front 1543

Main Distribution Frame
(MDF) Area

Back 1543

The area or enclosed room of a telecommunications facility that contains main distribution frame (MDF) equipment.

Front 1544

Main Distribution Frame
(MDF) Equipment

Back 1544

Rack-mounted termination blocks and electrical protection devices, cabling, wiring, and auxiliary equipment. The MDF wiring arrangement connects the wire and cable coming from the cable entrance facility to the wire and cable running to the signal-processing equipment and secondary cross connect frames.

Front 1545

Main Drain

Back 1545

The primary drain connection located on the system riser and also utilized as a flow test connection.

Front 1546

Main Drain(s)

Back 1546

The lowest piping of a drainage system that receives the liquid or body waste discharge from all the fixtures within the system and conducts these wastes to the drain outlet(s).

Front 1547

Main Fuel

Back 1547

In a fluidized bed boiler, gaseous, liquid, or solid fuel introduced into the bed after the bed temperature has reached a value sufficient to support its combustion and that is used during the normal operation of the boiler. Main fuels necessitate the use of the fluidized hot bed as their ignition source.

Front 1548

Main Fuel Tank

Back 1548

A separate, main fuel tank for supplying fuel to the engine or a day tank.

Front 1549

Main Fuel Temperature
Permit

Back 1549

The minimum fluidized bed temperature at which the main fuel can be introduced with resulting stable combustion.

Front 1550

Main Gear

Back 1550

Refers to the two or more larger landing gear structures of an aircraft, as opposed to wing, nose, or tail gear assemblies.

Front 1551

Main Lines

Back 1551

The piping that connects the source (pumps, receivers, etc.) to the risers or branches, or both. (PIP)

Front 1552

Maintain Essential
Environment

Back 1552

Ensure the sufficient prevention, removal, dissipation, or neutralization of adverse conditions, other than fire or fire products, or both, as experienced by the exposed within the place.

Front 1553

Maintenance

Back 1553

In water-based fire protection systems, work performed to keep equipment operable or to make repairs.

Front 1554

Maintenance

Back 1554

Procedures for inspection, repair, and removal from service of CBRN
protective ensembles and ensemble elements.

Front 1555

Maintenance

Back 1555

Procedures for inspection, repair, and removal from service of liquid splash-protective ensembles or clothing.

Front 1556

Maintenance

Back 1556

Procedures for inspection, repair, and removal from service of protective clothing and equipment.

Front 1557

Maintenance

Back 1557

Procedures for inspection, repair, and removal from service of vapor-protective ensembles.

Front 1558

Maintenance

Back 1558

Procedures for inspection, testing, repair, and retirement of the product.

Front 1559

Maintenance

Back 1559

The act of servicing a fire apparatus or a component in order to keep the vehicle and its components in proper operating condition.

Front 1560

Maintenance

Back 1560

The inspection, service, and repair of protective clothing and equipment, including the determination for removal from service.

Front 1561

Maintenance

Back 1561

Work, including, but not limited to, repair, replacement, and service, performed to ensure that equipment operates properly. (SIG-TMS)

Front 1562

Maintenance

Back 1562

Work performed to ensure that equipment operates as directed by the manufacturer.

Front 1563

Maintenance

Back 1563

Work performed to ensure that equipment operates as directed by the manufacturer. [10, 2002]

Front 1564

Maintenance Hole

Back 1564

A structure located on top of an opening in a gravity sewer, or an opening in the top or side of an enclosed vessel to allow personnel entry; also referred to as manhole or manway.

Front 1565

Maintenance Kits

Back 1565

Items required for maintenance and inspection that include, but are not limited to, manufacturer product specifications; preventive maintenance checklists; periodic logbook records; inventory equipment lists; appropriate fluids, parts, and hardware; and testing instruments as required.

Front 1566

Maintenance (Laser Products)

Back 1566

Performance by the user of those adjustments or procedures specified in user information provided by the manufacturer with the laser or laser system to ensure the intended performance of the product.

Front 1567

Major A Seam

Back 1567

Outermost layer seam assemblies where rupture could reduce the protection of the garment by exposing the garment’s inner layers.

Front 1568

Major B Seam

Back 1568

Inner layer seam assemblies where rupture could reduce the protection of the garment by exposing the next layer of the garment, the wearer’s station/work uniform, other clothing, or skin.

Front 1569

Major Conversion

Back 1569

A change in service of the vessel from some other use to use as a marine fire-fighting vessel.

Front 1570

Major Facility

Back 1570

A purpose-built motorsports venue occupying a large amount of land that can accommodate a mass gathering to witness a motorsports event.

Front 1571

Major Fire Hazard Area

Back 1571

Any compartment, space, or duct where the proximity of combustible materials, flammable liquids, and potential sources of ignition can promote a fire.

Front 1572

Major Modification

Back 1572

A conversion of a vessel that substantially changes the dimensions or carrying capability of the vessel, changes the type of the vessel, substantially prolongs the life of the vessel, or otherwise changes the vessel such that it is essentially a new vessel.

Front 1573

Major Repair Garage

Back 1573

A building or portions of a building where major repairs, such as engine overhauls, painting, body and fender work, and repairs that require draining of the motor vehicle fuel tank are performed on motor vehicles, including associated floor space used for offices, parking, or showrooms.

Front 1574

Major Repair Garage

Back 1574

A building or portions of a building where major repairs, such as engine overhauls, painting, body and fender work, and repairs that require draining of the motor vehicle fuel tank are performed on motor vehicles, including associated floor space used for offices, parking, or showrooms. [30A:3.3.12.1]

Front 1575

Major Seam

Back 1575

Seam assemblies where rupture exposes the wearer to immediate danger.

Front 1576

Major Stress Seams

Back 1576

Classes of seams that designate minimum sewn seam requirements.

Front 1577

Major Stress Seams Class I

Back 1577

The seat seams, side seams, and inseams of pants; the seat seams, side seams, inseams, and waist seams in the bottom portion of coveralls; and the yoke(s) seams, side seams, sleeve set and close seams, and shoulder seams for the upper portion of coveralls.

Front 1578

Major Stress Seams Class II

Back 1578

The yoke(s) seams, side seams, sleeve set and close seams, and shoulder seams for knit fabrics and woven shirting fabrics.

Front 1579

Major Tenant

Back 1579

A tenant space, in a mall building, with one or more main entrances from the exterior that also serve as exits and are independent of the mall.

Front 1580

Mall

Back 1580

A roofed or covered common pedestrian area within a mall building that serves as access for two or more tenants and does not exceed three levels that are open to each other.

Front 1581

Mall Building

Back 1581

A single building enclosing a number of tenants and occupancies wherein two or more tenants have a main entrance into one or more malls. For the purpose of this Code, anchor buildings shall not be considered as a part of the mall building.

Front 1582

Manage

Back 1582

Coordinate broadly-ranging available methods toward accomplishment of objectives.

Front 1583

Manage Exposed

Back 1583

Coordinate measures directly involving the exposed.

Front 1584

Manage Fire

Back 1584

Coordinate measures for control of the fire or fire products, or both.

Front 1585

Manage Fire Impact

Back 1585

Coordinate measures to limit any harm directly or indirectly resulting from fire or fire products, or both.

Front 1586

Management

Back 1586

For the purpose of hot work, all persons, including owners, contractors, educators, and so on, who are responsible for hot work operations.

Front 1587

Management

Back 1587

The collective body of those who direct the operations of the organization.

Front 1588

Manifold

Back 1588

A device for connecting the outlets of one or more gas cylinders to the central piping system for that specific gas. (PIP)

Front 1589

Manifold

Back 1589

An assembly of pipe and fittings for connecting two or more cylinders for the purpose of supplying gas to a piping system or directly to a consuming device.

Front 1590

Manned Space

Back 1590

A space that is normally occupied.

Front 1591

Mantel

Back 1591

A shelf or facing ornament above a fireplace opening.

Front 1592

Manual

Back 1592

As applied to fire protection devices, a device or system activated by human action.

Front 1593

Manual

Back 1593

Employing human action.

Front 1594

Manual

Back 1594

Requiring intentional intervention to accomplish a function.

Front 1595

Manual Burner Management
System

Back 1595

A burner management system by which a furnace is purged and a burner is started, ignited, and stopped manually.

Front 1596

Manual Defibrillator

Back 1596

A device that delivers an electric shock through the chest wall to the heart and that requires operation by trained medical personnel.

Front 1597

Manual Dry Standpipe System

Back 1597

A standpipe system with no permanently attached water supply that is designed to have piping contain water only when the system is being utilized through the fire department connection.

Front 1598

Manual Electrical Firing Unit

Back 1598

A panel or box with manually operated switches that control the flow of electric current to electric matches attached to fireworks devices.

Front 1599

Manual Emergency Shutoff
Valve

Back 1599

A designated valve designed to shut off the flow of gases or liquids that is manually operated.

Front 1600

Manual Fire Alarm Box

Back 1600

A manually operated device used to initiate an alarm signal. [72, 2007]

Front 1601

Manual Fire Alarm Box

Back 1601

A manually operated device used to initiate an alarm signal. (SIG-IDS)

Front 1602

Manual Flame Effect

Back 1602

A flame effect that is operated manually without the use of an automatic control system.

Front 1603

Manual Flush Bolts

Back 1603

A mortised bolt installed near the top or bottom of the inactive leaf of a pair of doors in which the bolts are manually extended or retracted into or out of the header or sill by means of a lever.

Front 1604

Manual Holdup Alarm System

Back 1604

A system or portion thereof in which the initiation of a holdup signal depends solely on operation of manually operated hand or foot initiating devices installed within the working area.

Front 1605

Manual Ignition

Back 1605

A technique used to ignite fireworks using a handheld ignition source such as a fusee or portfire.

Front 1606

Manually Ignited Burner

Back 1606

A burner equipped so that the main burner fuel is turned on only by hand and ignited under supervision.

Front 1607

Manually Operated Damper

Back 1607

An adjustable damper manually set and locked in the desired position.

Front 1608

Manually Regulated Foam
Proportioning System

Back 1608

A foam proportioning system that requires manual adjustment to maintain the proportioning ratio when there is a change of flow or pressure through the foam proportioner.

Front 1609

Manually Suppress Fire

Back 1609

Manually perform actions on a fire process in order to limit the growth of or extinguish the fire.

Front 1610

Manual Oil Shutoff Valve

Back 1610

A manually operated valve in an oil line for the purpose of turning on or completely shutting off the oil supply to the burner.

Front 1611

Manual Operation

Back 1611

Operation of a system or its components through human action.

Front 1612

Manual Operation

Back 1612

Operation of a system or its components through human action. [25,
2008]

Front 1613

Manual Reset Valve

Back 1613

An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe conditions occur. The device remains closed
until manually reopened.

Front 1614

Manual Standpipe

Back 1614

Standpipe system that relies exclusively on the fire department connection to supply the system demand.

Front 1615

Manual Standpipe System

Back 1615

A standpipe system that relies exclusively on the fire department connection to supply the system demand.

Front 1616

Manual, Supervised Burner
Management System

Back 1616

A burner management system by which a furnace is purged and a burner is started, ignited, and stopped manually. Interlocks are included to ensure that the operation follows established, proper procedures.

Front 1617

Manual Transfer Switch

Back 1617

A switch operated by direct manpower for transferring one or more load conductor connections from one power source to another.

Front 1618

Manufacture

Back 1618

The preparation of propellant, delay, and ejection compositions and the loading and assembly of model or high power rocket motors and igniters and any other alteration of their pyrotechnic components.

Front 1619

Manufactured Assembly

Back 1619

A factory-assembled product designed for aesthetics or convenience that contains medical gas or vacuum outlets, piping, or other devices related to medical gases. (PIP)

Front 1620

Manufactured Building

Back 1620

Any building that is of closed construction and is made or assembled in manufacturing facilities on or off the building site for installation, or for assembly and installation on the building site, other than manufactured homes, mobile homes, park trailers, or recreational vehicles.

Front 1621

Manufactured Home

Back 1621

A structure, transportable in one or more sections, that, in the traveling mode, is 2.4 m (8 body-ft) or more in width or 12.2 m (40 body-ft) or more in length, or, when erected on site, is 29.7 m2
(320 ft2) or more and that is built on a permanent chassis and designed to be used as a dwelling, with or without a permanent foundation, when connected therein. The term manufactured home includes any structure that meets all the provisions of this paragraph except the size requirements and with respect to which the manufacturer voluntarily files a certification required by the regulatory agency, and except that such term does not include any
self-propelled recreational vehicle. Calculations used to determine the number of square meters (square feet) in a structure are based on the structure’s exterior dimensions, measured at the largest horizontal projections when erected on site. These dimensions include all expandable rooms, cabinets, and other projections containing
interior space but do not include bay windows.

Front 1622

Manufactured Home

Back 1622

A structure, transportable in one or more sections, that, in the traveling mode, is 8 body-ft (2.4 m) or more in width or 40 body-ft (12.2 m) or more in length or, when erected on site, is 320 ft2 (29.7 m2) or more and that is built on a permanent chassis and designed to be used as a dwelling, with or without a permanent foundation, when connected therein. The term manufactured home includes any structure that meets all the provisions of this paragraph except the size requirements and with respect to which the manufacturer voluntarily files a certification required by the regulatory agency, and except that such term shall not include any self-propelled recreational vehicle. Calculations used to determine the number of square feet (square meters) in a structure are based on the structure’s exterior dimensions, measured at the largest horizontal projections when erected on site. These dimensions include all expandable rooms, cabinets, and other projections containing interior space, but do not include bay windows.

Front 1623

Manufactured Home

Back 1623

A structure, transportable in one or more sections, that is 8 body-ft (2.44 m) or more in width or 40 body-ft (12.2 m) or more in length in the traveling mode or, when erected on site, is 320 ft2 (28 m2) or more; which is built on a chassis and designed to be used as a
dwelling, with or without a permanent foundation, when connected to the required utilities, including the plumbing, heating,
air-conditioning, and electrical systems contained therein. (Also see
3.3.63, Industrialized Unit.)

Front 1624

Manufactured Home

Back 1624

A structure, transportable in one or more sections, which, in the traveling mode, is 8 body-ft (2.4 m) or more in width or 40 body-ft (12.2 m) or more in length or, when erected on site, is 320 ft2 (29.7 m2) or more and which is built on a permanent chassis and designed to be used as a dwelling, with or without a permanent foundation, when connected to the required utilities, and includes plumbing, heating, air-conditioning, and electrical systems contained therein; except that such terms shall include any structure which meets all the requirements of this paragraph except the size requirements and with respect to which the manufacturer voluntarily files a certification required by the regulatory agency. Calculations used to determine the number of square feet in a structure are based on the structure’s exterior dimensions, measured at the largest horizontal projections when erected on site. These dimensions include all expandable
rooms, cabinets, and other projections containing interior space, but do not include bay windows.

Front 1625

Manufactured Home

Back 1625

A structure, transportable in one or more sections, which, in the traveling mode, is 8 body-ft (2.4 m) or more in width or 40 body-ft (12.2 m) or more in length or, when erected on site, is 320 ft2 (29.7 m2) or more and which is built on a permanent chassis and designed to be used as a dwelling, with or without a permanent foundation, when connected to the required utilities, and includes plumbing, heating, air-conditioning, and electrical systems contained therein; except that such terms shall include any structure which meets all the requirements of this paragraph except the size requirements and with respect to which the manufacturer voluntarily files a certification required by the regulatory agency. Calculations used to determine the number of square feet in a structure are based on the structure’s exterior dimensions, measured at the largest horizontal projections when erected on site. These dimensions include all expandable
rooms, cabinets, and other projections containing interior space, but do not include bay windows. [501, 2005]

Front 1626

Manufactured Home Accessory Building or Structure

Back 1626

A building or structure that is an addition to a manufactured home or that supplements the facilities provided in a manufactured home; it is not a self-contained, separate, habitable building or structure.

Front 1627

Manufactured Home Accessory Building or Structure

Back 1627

A building or structure that is an addition to or supplements the facilities provided by a manufactured home.

Front 1628

Manufactured Home (Flood
Resistance)

Back 1628

For all matters related to installation or erection in flood hazard areas: (1) a structure, transportable in one or more sections, built on a chassis and designed to be used as a dwelling with or without a permanent foundation, when connected to the required utilities, and constructed to the Federal Manufactured Home Construction and Safety Standards and rules and regulations promulgated by the U.S. Department of Housing and Urban Development; (2) a mobile home, park trailer, travel trailer, and similar transportable structure that is placed on a site for 180 consecutive days or longer.

Front 1629

Manufactured Home Gas
Supply Connector

Back 1629

A listed connector designed for connecting the manufactured home to the gas supply source.

Front 1630

Manufactured Home Gas
Supply Connector

Back 1630

A listed connector designed for connecting the manufactured home to the gas supply source. [501A, 2005]

Front 1631

Manufactured Home Park or
Subdivision

Back 1631

For all matters related to installation in flood hazard areas, the term manufactured home park or subdivision shall mean a parcel (or contiguous parcels) of land divided into two or more manufactured home sites for sale or rent.

Front 1632

Manufactured Home Park or Subdivision (Flood Resistance)

Back 1632

A parcel, or contiguous parcels, of land divided into two or more manufactured home lots.

Front 1633

Manufactured Home Site

Back 1633

A designated parcel of land designed for the accommodation of one manufactured home, its accessory buildings or structures, and accessory equipment, for the exclusive use of the occupants of the home.

Front 1634

Manufactured Home Site

Back 1634

A parcel of land for the accommodation of one manufactured home, its accessory building or structures, and accessory equipment for the exclusive use of the occupants.

Front 1635

Manufactured Phase

Back 1635

The manufactured or derived phase originates at the phase converter and is not solidly connected to either of the single-phase input conductors.

Front 1636

Manufactured System

Back 1636

Preassembled system sold as a unit by the manufacturer and tested as a complete assembly.

Front 1637

Manufactured Wiring System

Back 1637

A system containing component parts that are assembled in the process of manufacture and cannot be inspected at the building site without damage or destruction to the assembly and used for the connection of luminaires, utilization equipment, continuous plug-in type busways, and other devices.

Front 1638

Manufacturer

Back 1638

The entity that assembles the compliant product and also maintains the product conformance verification.

Front 1639

Manufacturer

Back 1639

The entity that assumes the liability and provides the warranty for the compliant product.

Front 1640

Manufacturer

Back 1640

The entity that assumes the liability, provides the warranty for the compliant product, or obtains the product certification.

Front 1641

Manufacturer

Back 1641

The entity that directs and controls any of the following: compliant product design, compliant product manufacturing, or compliant product quality assurance; or the entity that assumes the liability for the compliant product or provides the warranty for the compliant product.

Front 1642

Manufacturer

Back 1642

The person or persons, company, firm, corporation, partnership, or other organization responsible for turning raw materials or components into a finished product.

Front 1643

Manufacturer

Back 1643

The person or persons, company, firm, corporation, partnership, or other organization responsible for turning raw materials or components into a finished product. [1901, 2003]

Front 1644

Manufacturer

Back 1644

The person or persons, company, firm, corporation, partnership, or other organization responsible for turning the raw materials or components into a certified product for use.

Front 1645

Manufacturer’s Listed Installation and Maintenance Manual

Back 1645

The pamphlet referenced as part of the listing of the dry chemical extinguishing system.

Front 1646

Manufacturer’s Listed Installation and Maintenance Manual

Back 1646

The pamphlet referenced as part of the listing of the wet chemical extinguishing system.

Front 1647

Manufacturer’s Lot

Back 1647

An identifiable series of products that can be the same as or a subset of a production lot; used by the manufacturer for quality control or identification purposes.

Front 1648

Manufacturer’s Recommendation (Specification)

Back 1648

Any requirement or suggestion a fire apparatus builder or component producer makes in regard to care and maintenance of its product(s).

Front 1649

Manufacturer’s Specifications

Back 1649

Any requirement or service bulletin an emergency response vehicle builder or component producer provides with regard to the use, care, and maintenance of its product(s).

Front 1650

Manufacturing

Back 1650

Mixing, blending, extruding, assembling articles outside the blast site, disassembling, chemical synthesis, and other functions involved in making a product or device that is intended to explode.

Front 1651

Manufacturing

Back 1651

The mixing, pressing, and loading of explosive or pyrotechnic compositions for the purpose of producing fireworks or pyrotechnic articles.

Front 1652

Manufacturing Facility

Back 1652

A place where manufacturing of fireworks, novelties, pyrotechnic articles, or components for these devices is conducted.

Front 1653

Manufacturing Plants

Back 1653

Those facilities where oxidizers are produced by chemical means or where oxidizers are pelletized, ground, dissolved, packaged, mixed, or blended.

Front 1654

Marina

Back 1654

A facility, generally on the waterfront, that stores and services boats in berths, on moorings, and in dry storage or dry stack storage.

Front 1655

Marine Chemist

Back 1655

The holder of a valid Certificate issued by the National Fire Protection Association in accordance with the “Rules for the Certification and Recertification of Marine Chemists,” establishing the person’s qualifications to determine whether construction, alteration, repair,
or shipbreaking of vessels can be undertaken with safety. Activities of a Marine Chemist are limited to the inspection and certification procedures described in NFPA 306, Standard for the Control of Gas Hazards on Vessels.

Front 1656

Marine Chemist

Back 1656

The holder of a valid Certificate issued by the National Fire Protection Association in accordance with the “Rules for the Certification and Recertification of Marine Chemists,” establishing the person’s qualifications to determine whether construction, alteration, repair,
or shipbreaking of vessels can be undertaken with safety. Activities of a Marine Chemist, as defined in this section, are limited to the inspection and certification procedures described in this standard and consulting services connected therewith.

Front 1657

Marine Chemist’s Certificate
(Certificate)

Back 1657

A written statement issued by a Marine Chemist, stating the conditions that the Marine Chemist found at the time of inspection.

Front 1658

Marine Facility

Back 1658

Any land-based facility that incorporates buildings, personnel, equipment, docks, moorings, and other features to support the docking, loading, unloading, maintenance, and servicing of marine vessels.

Front 1659

Marine Fire Fighter I

Back 1659

A land-based Fire Fighter II at the first level of progression as defined in Chapter 4, who has demonstrated the knowledge and skills to respond to an incident and operate in the proximity of a vessel or dock area or to provide support functions in the cold and warm zone on board a vessel.

Front 1660

Marine Fire Fighter II

Back 1660

A land-based Fire Fighter II at the second level of progression as defined in Chapter 5, who has demonstrated the knowledge and skills to respond to an incident and operate on a vessel while performing defensive and offensive functions inside the warm and hot zone on board a vessel.

Front 1661

Marine Incident

Back 1661

Any fire, explosion, hazardous material, utility, or other type of emergency incident on or in the vicinity of a marine vessel and/or facility to which a fire department can be expected to respond.

Front 1662

Marine Motor Fuel Dispensing
Facility

Back 1662

A motor fuel dispensing facility at or adjacent to shore, a pier, a wharf, or a floating dock where motor fuels are dispensed into the fuel tanks of marine craft.

Front 1663

Marine Motor Fuel Dispensing
Facility

Back 1663

A motor fuel dispensing facility at or adjacent to shore, a pier, a wharf, or a floating dock where motor fuels are dispensed into the fuel tanks of marine craft. [30A, 2008]

Front 1664

Marine Power Outlet

Back 1664

An enclosed assembly that can include receptacles, circuit breakers, fused switches, fuses and watt-hour meter, and monitoring means approved for marine use.

Front 1665

Marine Power Outlet

Back 1665

An enclosed assembly that can include receptacles, circuit breakers, fused switches, fuses, watt-hour meter(s), and monitoring means approved for marine use.

Front 1666

Marine Railway

Back 1666

A device used for hauling boats out of the water or placing boats into the water.

Front 1667

Marine Rescue and Fire
Fighting

Back 1667

The fire-fighting action taken to prevent, control, or extinguish fire involved in or adjacent to a marine vessel and the rescue actions for occupants using normal and emergency routes for egress.

Front 1668

Marine System

Back 1668

An aerosol system installed on a merchant vessel, ship, barge, boat, pleasure craft, offshore platform, or other floating structure.

Front 1669

Marine System

Back 1669

A sprinkler system installed on a ship, boat, or other floating structure that takes its supply from the water on which the vessel floats.

Front 1670

Marine Systems

Back 1670

Systems installed on ships, barges, offshore platforms, motorboats, and pleasure craft.

Front 1671

Marine Terminal

Back 1671

A facility comprised of one or more berths, piers, wharves, loading and unloading areas, warehouses, and storage yards and used for transfer of people and/or cargo between waterborne and land transportation modes.

Front 1672

Marine Terminal

Back 1672

A facility comprised of one or more berths, piers, wharves, loading and unloading areas, warehouses, and storage yards and used for transfer of people and/or cargo between waterborne and land transportation modes. [307, 2006]

Front 1673

Marine Terminal

Back 1673

A facility comprising one or more berths, slips, piers, wharves, loading and unloading areas, warehouses, and storage yards used for the transfer of people and/or cargo between waterborne carriers and land. [307, 2006]

Front 1674

Marine Thermal Barrier

Back 1674

An assembly that is constructed of noncombustible materials and made intact with the main structure of the vessel, such as shell, structural bulkheads, and decks. A marine thermal barrier shall meet the requirements of a B-Class boundary. In addition, a marine thermal barrier shall be insulated such that, if tested in accordance with ASTM E 119, Standard Test Methods for Fire Tests of Building Construction and Materials, for 15 minutes, the average temperature of the unexposed side does not rise more than 250°F (193°C) above the original temperature, nor does the temperature at any one point, including any joint, rise more than 405°F (225°C) above the original temperature.

Front 1675

Marine Tower

Back 1675

Stationary or movable tower used for supporting equipment to load or unload grain.

Front 1676

Marine Vessel

Back 1676

A water craft or other artificial contrivance used as a means of transportation in or on the water.

Front 1677

Marine Water Supply

Back 1677

The supply portion of the sprinkler system from the water pressure tank or the sea suction of the designated sprinkler system pump up to and including the valve that isolates the sprinkler system from these two water sources.

Front 1678

Marking

Back 1678

Signs or inscriptions attached by the manufacturer, for the identification of the type of a component or device.

Front 1679

Marking Systems

Back 1679

Various systems used to mark hazards, victim location, and pertinent structural information. (See Annex E.)

Front 1680

Marquee

Back 1680

Permanent roofed structure attached to and supported by a building.

Front 1681

Marshal

Back 1681

An individual assigned to provide observation and communications, to show flags to drivers, to provide first-response fire fighting and first-response emergency medical care, and to remove debris and assist in removing vehicles.

Front 1682

Mask

Back 1682

A device designed to limit exposure of the nasal, oral, respiratory, or mucosal membranes to airborne pathogens.

Front 1683

Mask

Back 1683

A device that fits over the mouth and nose (oronasal) or nose (nasal), used to administer gases to a patient. (GAS)

Front 1684

Masonry

Back 1684

Built-up unit of construction or combination of materials such as clay, shale, concrete, glass, gypsum, tile, or stone set in mortar.

Front 1685

Masonry Bonded Hollow Wall

Back 1685

A wall built of masonry units arranged to provide an air space within the wall, in which the inner and outer wythes of the wall are tied together with masonry units.

Front 1686

Masonry Chimney

Back 1686

A field-constructed chimney of solid masonry units, bricks, stones, listed masonry chimney units, or reinforced Portland cement concrete, lined with suitable chimney flue liners.

Front 1687

Masonry Chimney

Back 1687

A field-constructed chimney of solid masonry units, bricks, stones, listed masonry chimney units, or reinforced portland cement concrete that is lined with suitable chimney flue liners and built in accordance with the provisions of Chapter 4 of NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances.
[211, 2006]

Front 1688

Masonry Chimney

Back 1688

A field-constructed chimney of solid masonry units, bricks, stones, listed masonry chimney units, or reinforced portland cement concrete that is lined with suitable chimney flue liners and built in accordance with the provisions of Chapter 4 of this standard.

Front 1689

Masonry Fireplace

Back 1689

A hearth and fire chamber of solid masonry units, such as bricks, stones, listed masonry units, or reinforced concrete, provided with a suitable chimney.

Front 1690

Masonry Fireplace Lintel

Back 1690

The horizontal, noncombustible member, usually of masonry or steel, spanning the opening of a masonry fireplace to support the load above.

Front 1691

Mass Burn

Back 1691

A process in which municipal solid waste is hauled directly to a tipping floor or storage pit and then is used as a boiler fuel without any special processing.

Front 1692

Mass Decontamination

Back 1692

The physical process of reducing or removing surface contaminants from large numbers of victims in potentially life-threatening situations in the fastest time possible.

Front 1693

Mass Detonate (Mass Explode)

Back 1693

Simultaneous detonation or explosion of the total amount or a substantial amount of a quantity of explosive material caused by the explosion of a unit or part of the explosive material.

Front 1694

Mass Loss Concentration

Back 1694

The mass loss of a test specimen consumed during combustion per unit exposure chamber volume (g·m-3).

Front 1695

Mass Median Aerodynamic
Diameter (MMAD)

Back 1695

The measurement, with the geometric standard deviation, used to describe the particle size distribution of any aerosol statistically, based on the weight and size of the particles.

Front 1696

Mass Notification System

Back 1696

A system used to provide information and instructions to people, in a building, area site, or other space. (SIG-PRO)

Front 1697

Mass Optical Density (MOD)

Back 1697

The ratio of the optical density of smoke and the mass loss of the test specimen, multiplied by the volume of the test chamber and divided by the length of the light path.

Front 1698

Master

Back 1698

The captain of a merchant ship.

Front 1699

Master

Back 1699

The captain of a merchant ship. [1405, 2006]

Front 1700

Master Alarm System

Back 1700

A warning system that monitors the operation and condition of the source of supply, the reserve source (if any), and the pressure in the main lines of each medical gas and vacuum piping system. (PIP)

Front 1701

Master Box

Back 1701

A publicly accessible fire alarm box that can also be operated by one or more remote initiating devices or an auxiliary fire alarm system used to send an alarm to the public fire service communications center. (SIG-PRS)

Front 1702

Master Fire Alarm Control
Unit

Back 1702

A fire alarm control unit that serves the protected premises or portion of the protected premises as a local fire alarm control unit and
accepts inputs from other fire alarm control units. (SIG-PRO)

Front 1703

Master Fuel Trip

Back 1703

An event resulting in the rapid shutoff of all fuel, including igniters; for HRSGs, an event resulting in the rapid shutoff of all fuel to the duct burners, including igniters.

Front 1704

Master Fuel Trip Relay

Back 1704

An electromechanical relay(s) utilized to trip all required equipment simultaneously when a master fuel trip is initiated.

Front 1705

Master Pressure Reducing
Valve

Back 1705

A pressure reducing valve installed to regulate pressures in an entire fire protection system and/or standpipe system zone.

Front 1706

Master Record

Back 1706

An information record on a medium that can be referred to whenever there is a need to rebuild a data base.

Front 1707

Master Stream

Back 1707

A portable or fixed fire-fighting appliance supplied by either hose lines or fixed piping and that has the capability of flowing in excess of
1140 L/min (300 gpm) of water or water-based extinguishing agent.

Front 1708

Master Stream

Back 1708

A portable or fixed fire-fighting appliance supplied by either hose lines or fixed piping and that has the capability of flowing in excess of
300 gpm (1140 L/min) of water or water-based extinguishing agent. [600, 2005]

Front 1709

Master Stream Nozzle

Back 1709

A nozzle with a rated discharge of 1325 L/min (350 gpm) or greater.

Front 1710

Match

Back 1710

To provide with a counterpart.

Front 1711

Mate

Back 1711

A deck officer on a merchant ship ranking below the master.

Front 1712

Mate

Back 1712

A deck officer on a merchant ship ranking below the master. [1405, 2006]

Front 1713

Material First Ignited

Back 1713

The combustible that is first set on fire by the heat of ignition. To be meaningful, both a type of material and an item ignited should be identified. (See Section 8.6.)

Front 1714

Material First Ignited

Back 1714

The fuel that is first set on fire by the heat of ignition; to be meaningful, both a type of material and a form of material should be identified.

Front 1715

Material Safety Data Sheet
(MSDS)

Back 1715

A form, provided by manufacturers and compounders (blenders) of chemicals, containing information about chemical composition, physical and chemical properties, health and safety hazards, emergency response, and waste disposal of the material.

Front 1716

Material Safety Data Sheet
(MSDS)

Back 1716

A form, provided by manufacturers and compounders (blenders) of chemicals, containing information about chemical composition, physical and chemical properties, health and safety hazards, emergency response, and waste disposal of the material. [472:3.3]

Front 1717

Material Safety Data Sheet
(MSDS)

Back 1717

The document that describes composition of a material, hazardous properties and hazard mitigation, and disposal information prepared in accordance with the Occupational Safety and Health Administration (OSHA) hazard communication standard (29 CFR
1910.1200, “Hazard Communication”).

Front 1718

Material Safety Data Sheet
(MSDS)

Back 1718

Written or printed material concerning a hazardous material that is prepared in accordance with the provisions of 29 CFR 1910.1200.

Front 1719

Material Safety Data Sheet
(MSDS)

Back 1719

Written or printed material concerning a hazardous material that is prepared in accordance with the provisions of OSHA 29 CFR
1910.1200.

Front 1720

Materials and Methods
Requirements

Back 1720

Those requirements of applicable codes that specify material standards, details of installation and connection, joints, penetrations, and continuity of any element, component, or system in the building.

Front 1721

Maximum Allowable Quantity
(MAQ)

Back 1721

For the purposes of this code, the quantity of flammable and combustible liquid permitted in a control area.

Front 1722

Maximum Allowable Quantity
(MAQ)

Back 1722

The quantity of hazardous material permitted in a control area.

Front 1723

Maximum Allowable Quantity
Per Control Area (MAQ)

Back 1723

A threshold quantity of hazardous material in a specific hazard class that once exceeded requires the application of additional administrative procedures, construction features or engineering controls.

Front 1724

Maximum Allowable Working
Pressure

Back 1724

The maximum gauge pressure permissible at the top of completed equipment, a container, or a vessel in its operating position for a design temperature.

Front 1725

Maximum Allowable Working
Pressure (MAWP)

Back 1725

The maximum gauge pressure permitted at the top of completed equipment, a container, or a vessel in its operating position at a design temperature. [59A, 2006]

Front 1726

Maximum Allowable Working
Pressure (MAWP)

Back 1726

The maximum pressure at which a pressure vessel is to operate as described by the ASME Boiler and Pressure Vessel Code.

Front 1727

Maximum Allowable Working
Pressure (MAWP)

Back 1727

The maximum pressure at which a pressure vessel is to operate is described by the ASME Boiler and Pressure Vessel Code. [58, 2008]

Front 1728

Maximum Allowable Working
Pressure (MAWP)

Back 1728

The maximum pressure to which any component or portion of the pressure system can be subjected over the entire range of design temperatures. This value is 1.1 × 1.25 × the service pressure.

Front 1729

Maximum Certificated
Occupant Capacity

Back 1729

The maximum number of persons that can be carried for each
specific aircraft model as certified by the authority having jurisdiction.

Front 1730

Maximum Considered
Earthquake Ground Motion

Back 1730

The most severe earthquake effects considered by this code as defined in ASCE/SEI 7, Section 11.4. [ASCE/SEI 7:11.2]

Front 1731

Maximum Continuous
Operating Voltage (MCOV)

Back 1731

The maximum designated rms value of the power frequency voltage that can be continuously applied to the mode of protection of a surge protective device (SPD).

Front 1732

Maximum Discharge Current
(Imax)

Back 1732

The maximum instantaneous value of the current through the SPD
having an 8/20 µs waveform.

Front 1733

Maximum Expected Fire
Scenarios

Back 1733

Scenarios that represent the most challenging fire that could be reasonably anticipated for the occupancy type and conditions in the space. These scenarios can be established based on electric power industry experience with consideration for plant specific conditions and fire experience. (See Annex C for a list of industry examples of fire scenarios for typical plant areas.)

Front 1734

Maximum Experimental Safe
Gap (MESG)

Back 1734

The maximum clearance between two parallel metal surfaces that has been found, under specified test conditions, to prevent an explosion in a test chamber from being propagated to a secondary chamber containing the same gas or vapor at the same concentration.

Front 1735

Maximum Experimental Safe
Gap (MESG)

Back 1735

The maximum clearance between two parallel metal surfaces that has been found, under specified test conditions, to prevent an explosion in a test chamber from being propagated to a secondary chamber containing the same gas or vapor at the same concentration. [497,
2004]

Front 1736

Maximum Extended Length

Back 1736

The total length of the extension ladder when all fly sections are fully extended and all pawls are engaged.

Front 1737

Maximum Extended Length

Back 1737

The total length of the extension ladder when all fly sections are fully extended and all pawls are engaged. [1931:3.3]

Front 1738

Maximum Filling Volume

Back 1738

The maximum volume to which a liquid-containing vessel could be filled.

Front 1739

Maximum Operating Pressure

Back 1739

The maximum pressure at which the device is designed to be operated.

Front 1740

Maximum Operating Pressure

Back 1740

The steady-state gauge pressure at which a part or system normally operates. This value is 1.25 × the pressure.

Front 1741

Maximum Output Power

Back 1741

The maximum output power delivered by an amplifier into its rated load as determined under specified test conditions. This may exceed the manufacturer’s rated output power for the same amplifier.

Front 1742

Maximum Pressure (Pmax)

Back 1742

The maximum pressure developed in a contained deflagration for an optimum mixture. [68, 2007]

Front 1743

Maximum Pressure (Pmax)

Back 1743

The maximum pressure developed in a contained deflagration of an optimum mixture.

Front 1744

Maximum Pump Brake
Horsepower

Back 1744

The maximum brake horsepower required to drive the pump at rated speed. The pump manufacturer determines this by shop test under expected suction and discharge conditions. Actual field conditions can vary from shop conditions.

Front 1745

Maximum Pump Close-Off
Pressure

Back 1745

The maximum pump discharge pressure obtained with all discharge outlets closed, with the pump primed and running, with the pump drive engine operating at maximum obtainable speed, and with the pump intake pressure at atmospheric pressure or less.

Front 1746

Maximum Pump Close-Off
Pressure

Back 1746

The maximum pump discharge pressure obtained with all discharge outlets closed, with the pump primed and running with the pump drive engine operating at maximum obtainable speed, and with the pump intake pressure at atmospheric pressure or less. [1901, 2003]

Front 1747

Maximum Rated Pressure

Back 1747

The maximum pressure at which the manufacturer determines it is safe to operate the nozzle.

Front 1748

Maximum Rate of Pressure
Rise [(dP/dt)max]

Back 1748

The slope of the steepest part of the pressure-versus-time curve recorded during deflagration in a closed vessel.

Front 1749

Maximum System Voltage

Back 1749

The highest fuel cell inverter output voltage between any ungrounded conductors present at accessible output terminals.

Front 1750

Maximum Water Level

Back 1750

The highest level that water can reach before it spills out.

Front 1751

Maximum Working Load

Back 1751

Weight supported by the life safety rope and system components that must not be exceeded.

Front 1752

Maximum Working Pressure

Back 1752

The maximum pressure at which a piping system may be operated in accordance with the provisions of this code.

Front 1753

Meal Finishing Area

Back 1753

The area that contains the equipment needed to prepare the extracted and desolventized material for storage.

Front 1754

Means of Access

Back 1754

The method by which entry or approach is made by emergency apparatus to structures — for example, roadways, fire lanes, and parking lots.

Front 1755

Means of Egress

Back 1755

A continuous and unobstructed way of exit travel from any point in a building or structure to a public way consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3) the exit discharge.

Front 1756

Means of Egress

Back 1756

A continuous and unobstructed way of exit travel from any point in the vessel to an area of refuge or embarkation area consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3)
the exit discharge.

Front 1757

Means of Egress

Back 1757

A continuous and unobstructed way of travel from any point in a building or structure to a public way consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3) the exit discharge.

Front 1758

Means of Egress

Back 1758

A continuous and unobstructed way of travel from any point in a building or structure to a public way consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3) the exit discharge. [101, 2003]

Front 1759

Means of Egress

Back 1759

A continuous and unobstructed way of travel from any point in a building or structure to a public way consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3) the exit discharge. [101, 2009]

Front 1760

Means of Egress

Back 1760

A continuous and unobstructed way of travel from any point in a building or structure to a public way consisting of three separate and distinct parts: (1) the exit access, (2) the exit, and (3) the exit discharge. [5000, 2006]

Front 1761

Means of Escape

Back 1761

A way out of a building or structure that does not conform to the strict definition of means of egress but does provide an alternate way out.

Front 1762

Means of Escape

Back 1762

A way out of a building or structure that does not conform to the strict definition of means of egress but does provide an alternate way out. [101, 2006]

Front 1763

Means of Escape

Back 1763

A way out of a building or structure that does not conform to the strict definition of means of egress but does provide an alternate way out. [101, 2009]

Front 1764

Means of Escape (Recreational
Vehicle)

Back 1764

A way to the outside of a recreational vehicle.

Front 1765

Measured Limiting Voltage
(MLV)

Back 1765

Maximum magnitude of voltage that is measured across the terminals of the surge protective device (SPD) during the application of impulses of specified waveshape and amplitude.

Front 1766

Mechanical Advantage (M/A)

Back 1766

A force created through mechanical means including, but not limited to, a system of levers, gearing, or ropes and pulleys usually creating an output force greater than the input force and expressed in terms of a ratio of output force to input force.

Front 1767

Mechanical Advantage (M/A)

Back 1767

A force created through mechanical means, including but not limited to, a system of levers, gearing, or ropes and pulleys usually creating an output force greater than the input force and expressed in terms of a ratio of output force to input force.
[1670, 2004]

Front 1768

Mechanical Atomizer

Back 1768

The device in a burner that breaks down liquid fuel into a finely divided state without using an atomizing medium.

Front 1769

Mechanical Building

Back 1769

A building that contains mechanical, electrical, air-conditioning, or other equipment and that usually is connected to a process or nonprocess building.

Front 1770

Mechanical Code

Back 1770

The mechanical code referenced in Section 2.2.

Front 1771

Mechanical Code

Back 1771

The mechanical or mechanical construction code adopted by the jurisdiction.

Front 1772

Mechanical-Draft

Back 1772

A cooling tower classification in which air movement depends on fans or blowers.

Front 1773

Mechanical Draft

Back 1773

Draft produced by a fan or an air or steam jet. When a fan is located so as to push the flue gases through the chimney or vent, the draft is forced. When the fan is located so as to pull the flue gases through the chimney or vent, the draft is induced.

Front 1774

Mechanical Draft

Back 1774

Draft produced by a fan or an air or steam jet. When a fan is located so as to push the flue gases through the chimney or vent, the draft is forced. When the fan is located so as to pull the flue gases through the chimney or vent, the draft is induced.
[211, 2006]

Front 1775

Mechanical Draft

Back 1775

Draft produced by mechanical means.

Front 1776

Mechanical Draft-Type Burner

Back 1776

A burner that includes a power-driven fan, blower, or other mechanism as the primary means for supplying the air for combustion.

Front 1777

Mechanical Draft Venting
System

Back 1777

A venting system designed to remove flue or vent gases by mechanical means, which may consist of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressure.

Front 1778

Mechanical Equipment Room

Back 1778

Room that contains mechanical, electrical, air conditioning, or other equipment.

Front 1779

Mechanical Exhaust System

Back 1779

Equipment installed in and made a part of the vent to provide the required flow of gases through the vent.

Front 1780

Mechanically Actuated, Automatic Vent Damper Device

Back 1780

An automatic vent damper device dependent for operation on the direct application or transmission of mechanical energy without employing any type of energy conversion.

Front 1781

Mechanical Seal Toilet

Back 1781

A toilet fitted with a water flushing device and mechanically sealed trap.

Front 1782

Mechanical Smoke Exhaust
System

Back 1782

A dedicated or shared-duty fan system designed and suitable for the removal of heat and smoke.

Front 1783

Mechanical Stoker

Back 1783

A device consisting of a mechanically operated fuel feeding mechanism and a grate, used for the purpose of feeding solid fuel
into a furnace, distributing it over a grate, admitting air to the fuel for the purpose of combustion, and providing a means for removal or discharge of refuse.

Front 1784

Mechanical Type Parking
Structure

Back 1784

A parking structure that uses lifts or other mechanical devices to transport vehicles to various levels.

Front 1785

Mechanical Ventilation

Back 1785

A process of removing heat, smoke, and gases from a fire area by using exhaust fans, blowers, air-conditioning systems, or smoke ejectors.

Front 1786

Mechanical Ventilation

Back 1786

The flow of air or gas created by a fan, blower, or other mechanical means that will push or induce the gas stream through a ventilation system.

Front 1787

Media Collector

Back 1787

A bag house or a filter-type cartridge collector used for collecting dust.

Front 1788

Medical Air

Back 1788

For purposes of this standard, medical air is air supplied from cylinders, bulk containers, medical air compressors, or has been reconstituted from oxygen USP and oil-free, dry nitrogen NF.

Front 1789

Medical Air Compressor

Back 1789

A compressor that is designed to exclude oil from the air stream and compression chamber and that does not under normal operating conditions or any single fault add any toxic or flammable contaminants to the compressed air. (PIP)

Front 1790

Medical Care Facility Footwear

Back 1790

An item of emergency medical protective clothing that is designed and configured to provide protection to the wearer’s feet and ankles at medical care facilities.

Front 1791

Medical Control

Back 1791

The physician providing direction for patient care activities in the prehospital setting.

Front 1792

Medical/Dental Office

Back 1792

A building or part thereof in which the following occur: (1) Examinations and minor treatments/procedures are performed under the continuous supervision of a medical/dental professional; (2) Only sedation or local anesthesia is involved and treatment or procedures do not render the patient incapable of self-preservation under emergency conditions; (3) Overnight stays for patients or
24-hour operation are not provided. (ADM)

Front 1793

Medical Director

Back 1793

A physician trained in emergency medicine, designated as a medical director for the local EMS agency.

Front 1794

Medical Director

Back 1794

Plans and directs all aspects of an organization’s or system’s medical policies and programs, including operations and offline (protocol) and online medical direction (direct communication consultation); is responsible for strategic clinical relationships with other physicians; oversees the development of the clinical content in materials; ensures all clinical programs are in compliance; writes and reviews research publications appropriate to support clinical service offerings; requires an active degree in medicine with specialty experience or training in emergency mitigation, administration, and management; relies on experience and judgment to plan and accomplish goals; and typically coordinates with the incident command.

Front 1795

Medical Evaluation

Back 1795

The analysis of information for the purpose of making a determination of medical certification. Medical evaluation includes a medical examination.

Front 1796

Medical Evaluation

Back 1796

The analysis of information for the purpose of making a determination of medical certification. Medical evaluation includes a medical examination. [1582, 2007]

Front 1797

Medical Examination

Back 1797

An examination performed or directed by the fire department physician.

Front 1798

Medical Examination

Back 1798

An examination performed or directed by the fire department physician. [1582, 2007]

Front 1799

Medical First Receivers

Back 1799

Clinicians and other medical care staff at a medical care facility who have a role in emergency patient care including initial triage, decontamination, and treatment for patients who are delivered by emergency medical services or who self-present at a medical care facility, and those staff whose roles support these functions, e.g., security, set up, and patient tracking.

Front 1800

Medical Gas

Back 1800

A patient medical gas or medical support gas. (See also 3.3.143, Patient
Medical Gas and 3.3.111, Medical Support Gas.) (PIP)

Front 1801

Medical Gas System

Back 1801

An assembly of equipment and piping for the distribution of nonflammable medical gases such as oxygen, nitrous oxide, compressed air, carbon dioxide, and helium. (PIP)

Front 1802

Medical Gloves

Back 1802

An item of emergency medical protective clothing that is designed and configured to provide barrier protection to the wearer’s hand to at least the wrist.

Front 1803

Medical Gloves

Back 1803

Single-use patient examination gloves that are designed to provide a barrier against body fluids.

Front 1804

Medically Certified

Back 1804

A determination by the fire department physician that the candidate or current member meets the medical requirements of this standard.

Front 1805

Medically Fit

Back 1805

As determined by a qualified healthcare professional, there are no known medical limitations that would interfere with the process of making decisions and providing direction while exposed to a stressful environment.

Front 1806

Medical Monitoring

Back 1806

The ongoing evaluation of members who are at risk of suffering adverse effects from stress or from exposure to heat, cold, or hazardous environments.

Front 1807

Medical Oversight

Back 1807

The authorization for treatment by medical directors in local, regional, or state EMS systems.

Front 1808

Medical Support Gas

Back 1808

Piped gases such as nitrogen and instrument air that are used to support medical procedures by operating medical-surgical tools, equipment booms, pendants, and similar medical support applications.

Front 1809

Medical-Surgical Vacuum

Back 1809

A method used to provide a source of drainage, aspiration, and suction in order to remove body fluids from patients. (PIP)

Front 1810

Medical-Surgical Vacuum
System

Back 1810

An assembly of central vacuum producing equipment and a network of piping for patient suction in medical, medical-surgical, and waste anesthetic gas disposal (WAGD) applications. (PIP)

Front 1811

Medical Surveillance

Back 1811

The ongoing process of medical evaluation of hazardous materials response team members and public safety personnel who respond to a hazardous materials incident.

Front 1812

Medical Team Specialist

Back 1812

Any healthcare provider or medically trained specialist acting under the authority of the medical director and within the context of the National Incident Management System authorized to act as the medical point of contact for an incident. This can include, but is not exclusive to, nurses, nurse practitioners, EMTs, ECAs, physician assistants, and in some cases a health and safety officer.

Front 1813

Medical Transportation Area

Back 1813

That portion of the triage area where injured persons are staged for transportation to medical facilities under the direct supervision of a medical transportation officer.

Front 1814

Medical Unit

Back 1814

Functional unit within the service branch of the logistics section responsible for providing emergency medical treatment of emergency personnel.

Front 1815

Medical Waste

Back 1815

Items to be disposed of that have been contaminated with human waste, blood, or body fluids, or human waste, human tissue, blood, or body fluids for which special handling precautions are necessary.

Front 1816

Medium- and High-Expansion
Foam Concentrate

Back 1816

A concentrate, usually derived from hydrocarbon surfactants, used in specially designed equipment to produce foams having
foam-to-solution volume ratios of 20:1 to approximately 1000:1.

Front 1817

Medium- and High-Expansion
Foam Concentrate

Back 1817

A concentrate, usually derived from hydrocarbon surfactants, used in specially designed equipment to produce foams having
foam-to-solution volume ratios of 20:1 to approximately 1000:1. [11,
2005]

Front 1818

Medium-Expansion Foam

Back 1818

Foams with expansion ratios ranging from 20:1 to 200:1.

Front 1819

Medium-Heat Appliance-Type
Factory-Built Chimney

Back 1819

A chimney used with appliances that produce maximum flue gas temperatures of 1800°F (982°C), composed of listed, factory-built components, suitable for open, non-enclosed use at specified minimum clearances to combustibles, and assembled in accordance with the terms of the listing to form the completed chimney. [211,
2006]

Front 1820

Medium-Pressure Acetylene

Back 1820

Acetylene at gauge pressures exceeding 6.9 kPa (1 psi) but not exceeding 103 kPa (15 psi).

Front 1821

Medium Pressure Acetylene

Back 1821

Acetylene at pressures exceeding 1 psi (6.9 kPa) but not exceeding 15 psi (103 kPa). [51, 2002]

Front 1822

Medium Voltage Cable, Type MV

Back 1822

A single or multiconductor solid dielectric insulated cable rated 2001 volts or higher.

Front 1823

Melt

Back 1823

A material’s response to heat evidenced by softening of the fiber polymer that results in flowing or dripping.

Front 1824

Melt

Back 1824

A response to heat by a material resulting in evidence of flowing or dripping.

Front 1825

Melt

Back 1825

A response to heat by a material resulting in evidence of flowing or dripping. [1983, 2006]

Front 1826

Melt

Back 1826

A response to heat causing a change from solid to liquid, or become consumed.

Front 1827

Member

Back 1827

A person involved in performing the duties and responsibilities of a fire department, under the auspices of the organization.

Front 1828

Member

Back 1828

A person involved in performing the duties and responsibilities of a fire department under the auspices of the organization.
[1500, 2002]

Front 1829

Member

Back 1829

A person involved in performing the duties and responsibilities of a fire department, under the auspices of the organization.
[1500, 2007]

Front 1830

Member

Back 1830

A person involved in performing the duties and responsibilities of a fire department, under the auspices of the organization. [1500:3.3]

Front 1831

Member

Back 1831

A person involved in performing the duties and responsibilities of a fire department under the auspices of the organization. A fire department member can be a full-time or part-time employee or a paid or unpaid volunteer, can occupy any position or rank within the fire department, and can engage in emergency operations.

Front 1832

Member

Back 1832

A person involved in performing the duties and responsibilities of an emergency response organization on a full-time or part-time basis, with or without compensation.

Front 1833

Member

Back 1833

A person(s) involved in performing the duties and responsibilities of a fire department, under the auspices of the organization. [1500:3.3]

Front 1834

Member Assistance Program
(MAP)

Back 1834

A generic term used to describe the various methods used in the fire department for the control of alcohol and other substance abuse, stress, and personal problems that adversely affect member performance.

Front 1835

Member Assistance Program
(MAP)

Back 1835

A generic term used to describe the various methods used in the fire department for the control of alcohol and other substance abuse, stress, and personal problems that adversely affect member performance. [1500, 2007]

Front 1836

Member Organization

Back 1836

An organization formed to represent the collective and individual rights and interests of the members of the fire department, such as a labor union or fire fighters’ association.

Front 1837

Membrane

Back 1837

A thin layer of construction material.

Front 1838

Membrane

Back 1838

A thin layer of construction material. [5000, 2006]

Front 1839

Membrane Container

Back 1839

A container consisting of a thin metal primary container together with thermal insulation and a concrete container jointly forming an integrated, composite structure that provides liquid containment, where hydrostatic loads and other loadings on the membrane are transferred via the load-bearing insulation onto the concrete container such that the vapors are contained by the tank roof.

Front 1840

Membrane Hangar

Back 1840

The flexible structural fabric or film that supports the imposed loads and transmits them to the supporting structure. The membrane carries only tension or shear in the plane of the membrane.

Front 1841

Membrane Penetration

Back 1841

An opening for penetrations made through one side of a fire resistance-rated assembly.

Front 1842

Membrane Penetration

Back 1842

An opening for penetrations made through one side of a fire resistance-rated assembly. [5000, 2009]

Front 1843

Membrane Structure

Back 1843

A building or portion of a building incorporating an air-inflated,
air-supported, tensioned-membrane structure; a membrane roof; or a
membrane-covered rigid frame to protect habitable or usable space.

Front 1844

Membrane Structure

Back 1844

A building or portion of a building incorporating an air-inflated,
air-supported, tensioned-membrane structure; a membrane roof; or a
membrane-covered rigid frame to protect habitable or usable space.
[5000, 2006]

Front 1845

Mercantile Occupancy

Back 1845

An occupancy used for the display and sale of merchandise.

Front 1846

Mercantile Occupancy

Back 1846

An occupancy used for the display and sale of merchandise. [101, 2006]

Front 1847

Mercantile Occupancy

Back 1847

An occupancy used for the display and sale of merchandise. [5000, 2006]

Front 1848

Mercantile Occupancy

Back 1848

An occupancy used for the display and sale of merchandise. [5000, 2009]

Front 1849

Mercantile Occupancy

Back 1849

The occupancy or use of a building or structure or that portion thereof used for the wholesale or retail display, storage, and merchandising of goods or wares.

Front 1850

Mercantile Occupancy

Back 1850

An occupancy used for the display and sale of merchandise. [101:3.3]

Front 1851

Mesh Size

Back 1851

The dimensions of a mesh that are specified in ASTM E 11, Standard
Specification for Wire Cloth and Sieves for Testing Purposes.

Front 1852

Mesh-Type Filter

Back 1852

A general purpose air filter not listed for or intended for grease applications.

Front 1853

Messenger-Supported Wiring

Back 1853

An exposed wiring support system using a messenger wire to support insulated conductors by any one of the following:

Front 1854

Metacentric Height

Back 1854

A geometric point used to determine stability when related to the center of gravity and center of buoyancy.

Front 1855

Metal

Back 1855

Pure metal or alloys having the generally recognized properties of the metal, including the fire or explosion characteristics of the metal in its various forms.

Front 1856

Metal and Nonmetal

Back 1856

Minerals other than coal.

Front 1857

Metal Chimney

Back 1857

A field-constructed chimney of metal.

Front 1858

Metal Clad Cable, Type MC

Back 1858

A factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.

Front 1859

Metal-Clad Structure

Back 1859

A structure with sides or roof, or both, covered with metal.

Front 1860

Metal Composite Material
(MCM)

Back 1860

A factory-manufactured panel consisting of metal skins bonded to both faces of a core made of any plastic other than foamed plastic insulation as defined in 3.3.256.

Front 1861

Metal Composite Material
(MCM)

Back 1861

A factory-manufactured panel consisting of metal skins bonded to both faces of a core made of any plastic other than foam plastic insulation.

Front 1862

Metal Composite Panel Wall

Back 1862

Nonbearing wall built between columns and piers wholly supported at each story and comprised of an exterior and interior metal panel housing a foam or other insulating material.

Front 1863

Metal-Enclosed Power
Switchgear

Back 1863

A switchgear assembly completely enclosed on all sides and top with sheet metal (except for ventilating openings and inspection windows) and containing primary power circuit switching, interrupting devices, or both, with buses and connections. The assembly may include control and auxiliary devices. Access to the interior of the enclosure is provided by doors, removable covers, or both. Metal-enclosed power switchgear is available in non-arc-resistant or arc-resistant constructions.

Front 1864

Metal-Framed Structure

Back 1864

A structure with electrically continuous structural members of sufficient size to provide an electrical path equivalent to that of lightning conductors.

Front 1865

Metal Fuel Tank

Back 1865

A fuel container that includes all metal types, including surge and vent tanks, that can be removed from the aircraft for workshop or bench repair, but not including a metal fuel container that is an integral part of the aircraft and that, under certain major overhaul conditions, can be removed from the primary portion of the airframe.

Front 1866

Metal Hydride Storage System

Back 1866

A system for the storage of hydrogen gas in metal hydride material.

Front 1867

Metallic Auxiliary Gutter

Back 1867

A sheet metal enclosure used to supplement wiring spaces at meter centers, distribution centers, switchboards, and similar points of wiring systems. The enclosure has hinged or removable covers for housing and protecting electrical wires, cable, and busbars. The enclosure is designed for conductors to be laid or set in place after the enclosures have been installed as a complete system.

Front 1868

Metallic Hose

Back 1868

A hose whose strength depends primarily on the strength of its metallic parts; it can have metallic liners or covers, or both.

Front 1869

Metal Mineral

Back 1869

Belonging to the class of inorganic metal compounds occurring in the earth’s crust that are transformed into pure metals by metallurgical refining, including gold, silver, lead, zinc, nickel, and copper.

Front 1870

Metal Mineral Processing
Plant

Back 1870

A surface processing facility used to size, separate, and concentrate valuable metals from raw ore.

Front 1871

Metal Shield Connections

Back 1871

Means of connection designed to electrically and mechanically connect a metal shield to another metal shield, to a receptacle housing or self-contained device, or to a transition assembly.

Front 1872

Metal Wireways

Back 1872

Sheet metal troughs with hinged or removable covers for housing and protecting electrical wires and cable and in which conductors are laid in place after the wireway has been installed as a complete system.

Front 1873

Meter

Back 1873

An instrument installed to measure the volume of gas delivered through it.

Front 1874

Metering (Regulating) Valve

Back 1874

An oil control valve for regulating burner input.

Front 1875

Methane (CH4)

Back 1875

A colorless, odorless, flammable gaseous hydrocarbon present in natural gas and formed by the anaerobic decomposition of organic matter. (See 3.3.3, Anaerobic Digestion.)

Front 1876

Method

Back 1876

A process or technique to help resolve a model.

Front 1877

Methylacetylene-Propadiene, Stabilized (MPS)

Back 1877

A mixture of gases that, in the liquid phase, shall conform to the following: (1) methylacetylene-propadiene (in combination, with a maximum ratio of 3.0 moles of methylacetylene per mole of propadiene in the initial liquid phase in a storage container) — 68 mole percent maximum; (2) propane, butane, isobutane (in combination) — 24 mole percent minimum, of which at least 1⁄3 (8 mole percent of total mixture) shall be butane or isobutane; (3) propylene — 10 mole percent maximum; (4) butadiene — 2 mole percent maximum.

Front 1878

Mezzanine

Back 1878

An intermediate level between deck and overhead of any area or space that does not exceed 25 percent of the space below.

Front 1879

Mezzanine

Back 1879

An intermediate level between the floor and the ceiling of any room or space.

Front 1880

Mezzanine

Back 1880

An intermediate level between the floor and the ceiling of any room or space. [101, 2009]

Front 1881

Mezzanine (Accessibility)

Back 1881

An intermediate level or levels between the floor and ceiling of any story with an aggregate floor area of not more than one-third of the area of the room or space in which the level or levels are located, and having sufficient elevation that space for human occupancy can be provided on the floor below.

Front 1882

Micelle

Back 1882

The basic building unit of an emulsion.

Front 1883

Microwave

Back 1883

Radio waves with frequencies of 1000 MHz and higher.

Front 1884

Microwave Sensor

Back 1884

An active intrusion sensor that detects the movement of a person or object through a pattern of microwave energy.

Front 1885

Midsagittal Plane

Back 1885

The anatomical plane perpendicular to the basic plane and containing the midpoint of the line connecting the notches of the right and left inferior orbital ridges and the midpoint of the line connecting the superior rims of the right and left auditory meatus.

Front 1886

Midsagittal Plane

Back 1886

The plane, perpendicular to the basic and coronal planes, that bisects the head symmetrically.

Front 1887

Mild Steel Shell

Back 1887

All steel shells other than stainless steel and steel shells used for high-pressure cylinders.

Front 1888

Mine

Back 1888

A device containing multiple pyrotechnic effects that are simultaneously ignited and dispersed into the air from a mortar or tube.

Front 1889

Mine

Back 1889

A device containing multiple pyrotechnic effects that are simultaneously ignited and dispersed into the air from mortar or tube.

Front 1890

Mine

Back 1890

A device containing multiple pyrotechnic effects that are simultaneously ignited and dispersed into the air from mortar or tube. [1123, 2006]

Front 1891

Mine Operator

Back 1891

Any owner, lessee, or other person who operates, controls, or supervises a mine. [120:3.3]

Front 1892

Mine Operator

Back 1892

Any owner, lessee, or other person who operates, controls, or supervises a mine. [122:3.3]

Front 1893

Mineral

Back 1893

A naturally formed inorganic substance occurring in the earth’s crust and having a consistent and distinct set of physical properties and a composition that can be expressed by a chemical formula.

Front 1894

Mineral-Insulated, Metal- Sheathed Cable, Type MI

Back 1894

A factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath.

Front 1895

Minimum Breaking Strength
(MBS)

Back 1895

The result of subtracting three standard deviations from the mean result of the lot being tested using the formula in 8.2.5.2.

Front 1896

Minimum Continuous
Electrical Load

Back 1896

The electrical current required to continuously operate a defined set of electrical devices.

Front 1897

Minimum Continuous
Electrical Load

Back 1897

The electrical current required to continuously operate a defined set of electrical devices. [1901, 2003]

Front 1898

Minimum Design Metal
Temperature (MDMT)

Back 1898

As described by the ASME Boiler and Pressure Vessel Code.

Front 1899

Minimum Design Quantity
(MDQ)

Back 1899

The quantity of agent required to achieve the minimum design concentration as calculated using the method in 5.5.1 or 5.5.2, as appropriate.

Front 1900

Minimum Explosible
Concentration (MEC)

Back 1900

The minimum concentration of a combustible dust cloud that is capable of propagating a deflagration through a uniform mixture of the dust and air under the specified conditions of test.

Front 1901

Minimum Explosible
Concentration (MEC)

Back 1901

The minimum concentration of a combustible dust suspended in air, measured in mass per unit volume, that will support a deflagration.

Front 1902

Minimum Explosible
Concentration (MEC)

Back 1902

The minimum concentration of a combustible dust suspended in air, measured in mass per unit volume, that will support a deflagration. [654, 2006]

Front 1903

Minimum Fluidization Velocity

Back 1903

In a fluidized bed, the lowest velocity sufficient to cause incipient fluidization.

Front 1904

Minimum Igniting Current
(MIC) Ratio

Back 1904

The ratio of the minimum current required from an inductive spark discharge to ignite the most easily ignitible mixture of a gas or vapor, divided by the minimum current required from an inductive spark discharge to ignite methane under the same test conditions.

Front 1905

Minimum Ignition Energy

Back 1905

The minimum energy required to ignite a flammable mixture; usually the minimum energy of an electric spark or arc expressed in joules.

Front 1906

Minimum Ignition Energy
(MIE)

Back 1906

The minimum amount of energy released at a point in a combustible mixture that causes flame propagation away from the point, under specified test conditions.

Front 1907

Minimum Ignition Energy
(MIE)

Back 1907

The minimum energy required from a capacitive spark discharge to ignite the most easily ignitible mixture of a gas or vapor.

Front 1908

Minimum Separation Distance
(D0)

Back 1908

The minimum separation distance between adjacent buildings occupied in conjunction with the manufacture, transportation, storage, or use of explosive materials where one of the buildings contains explosive materials and the other building does not.

Front 1909

Minimum Water Supply

Back 1909

The quantity of water required for fire control and extinguishment.

Front 1910

Mini-Storage Building

Back 1910

A storage occupancy partitioned into individual storage units that are rented or leased for the purposes of storing personal or business items where all of the following apply: (1) the storage units are separated from each other by less than a 1-hr fire resistance rated barrier; (2)
the owner of the facility does not have unrestricted access to the storage units; and (3) the items being stored are concealed from outside the storage unit.

Front 1911

Mini-Storage Building

Back 1911

A storage occupancy partitioned into storage units that are rented or leased for the purposes of storing personal or business items where all of the following apply: (1) the storage units are separated from each other by less than a 1-hour fire resistance rated barrier, (2) the owner of the facility does not have unrestricted access to the storage units, and (3) the items being stored are concealed from view from outside the storage unit.

Front 1912

Minor Fire Hazard Area

Back 1912

Includes accommodation, service, and public spaces where the proximity of combustible materials, flammable liquids, and potential sources of ignitions doesn’t promote a fire.

Front 1913

Minor Repair Garage

Back 1913

A building or portions of a building used for lubrication, inspection, and minor automotive maintenance work, such as engine tune-ups, replacement of parts, fluid changes (e.g., oil, antifreeze, transmission fluid, brake fluid, air-conditioning refrigerants), brake system repairs, tire rotation, and similar routine maintenance work, including associated floor space used for offices, parking, or showrooms. [30A:3.3.12.2]

Front 1914

Minor Repair Garage

Back 1914

A building or portions of a building used for lubrication, inspection, and minor automotive maintenance work, such as engine tune-ups, replacement of parts, fluid changes (e.g., oil, antifreeze, transmission fluid, brake fluid, air conditioning refrigerants, etc.), brake system repairs, tire rotation, and similar routine maintenance work, including associated floor space used for offices, parking, or showrooms.

Front 1915

Minor Seam

Back 1915

Remaining seam assemblies that are not classified as Major A or Major
B seams.

Front 1916

Minor Seam

Back 1916

Remaining seam assemblies that are not classified as Major, Major A, or Major B seams.

Front 1917

Miscella

Back 1917

A mixture, in any proportion, of extracted oil or fat and the extracting solvent.

Front 1918

Miscellaneous Equipment

Back 1918

Portable tools and equipment carried on a fire apparatus not including suction hose, fire hose, ground ladders, fixed power sources, hose reels, cord reels, breathing air systems, or other major equipment or components permanently mounted on the apparatus.

Front 1919

Miscellaneous Equipment

Back 1919

Portable tools and equipment carried on a fire apparatus not including suction hose, fire hose, ground ladders, fixed power sources, hose reels, cord reels, breathing air systems, or other major equipment or components specified by the purchaser to be permanently mounted on the apparatus as received from the apparatus manufacturer. [1901, 2003]

Front 1920

Miscellaneous Equipment
Allowance

Back 1920

That portion of the GVWR allocated for the weight of the miscellaneous equipment and its mounting brackets, boards, or trays.

Front 1921

Miscellaneous Equipment
Allowance

Back 1921

That portion of the GVWR or GCWR allocated for the weight of the miscellaneous equipment and its mounting brackets, boards, or trays.

Front 1922

Miscellaneous Storage

Back 1922

Storage that does not exceed 12 ft (3.66 m) in height and is incidental to another occupancy use group. Such storage shall not constitute more than 10 percent of the building area or 4000 ft2 (372 m2) of the sprinklered area, whichever is greater. Such storage shall not exceed
1000 ft2 (93 m2) in one pile or area, and each such pile or area shall be separated from other storage areas by at least 25 ft (7.62 m).

Front 1923

Miscellaneous Tire Storage

Back 1923

The storage of rubber tires that is incidental to the main use of the building. Storage areas shall not exceed 2000 ft2 (186 m2). On-tread storage piles, regardless of storage method, shall not exceed 25 ft (7.6 m) in the direction of the wheel holes. Acceptable storage arrangements include (a) on-floor, on-side storage up to 12 ft (3.7 m) high; (b)
on-floor, on-tread storage up to 5 ft (1.5 m) high; (c) double-row or multirow fixed or portable rack storage on-side or on-tread up to 5 ft (1.5 m) high; (d) single row fixed or portable rack storage on-side or on-tread up to 12 ft (3.7 m) high; and (e) laced tires in racks up to 5 ft (1.5 m) in height.

Front 1924

Miscellaneous Tire Storage

Back 1924

The storage of rubber tires that is incidental to the main use of the building. Storage areas shall not exceed 2000 ft2 (186 m2). On-tread storage piles, regardless of storage method, shall not exceed 25 ft (7.6 m) in the direction of the wheel holes. Acceptable storage arrangements include (a) on-floor, on-side storage up to 12 ft (3.7 m) high; (b)
on-floor, on-tread storage up to 5 ft (1.5 m) high; (c) double-row or multirow fixed or portable rack storage on-side or on-tread up to 5 ft (1.5 m) high; (d) single row fixed or portable rack storage on-side or on-tread up to 12 ft (3.7 m) high; and (e) laced tires in racks up to 5 ft (1.5 m) in height. [13, 2007]

Front 1925

Miscibility

Back 1925

The property of being capable of mixing in any ratio without separation into phases.

Front 1926

Miscibility

Back 1926

The property of being capable of mixing in any ratio without separation into phases. [1150, 2004]

Front 1927

Misfire

Back 1927

A charge of explosive material that fails to detonate completely after initiation.

Front 1928

Misfueling

Back 1928

The accidental fueling of an aircraft or refueling vehicle tank with an incorrect grade of product.

Front 1929

Mission-Specific Competencies

Back 1929

The knowledge, skills, and judgment needed by operations level responders who have completed the operations level competencies and who are designated by the authority having jurisdiction to perform mission specific tasks, such as decontamination, victim/hostage rescue and recovery, evidence preservation, and sampling.

Front 1930

Mission-Specific
Competencies

Back 1930

The knowledge, skills, and judgment needed by operations level responders who have completed the requisite core competencies and who are designated by the authority having jurisdiction to perform mission-specific tasks, such as decontamination, victim/hostage rescue and recovery, evidence preservation and sampling, etc.

Front 1931

Mist

Back 1931

A dispersion of fine liquid droplets in a gaseous medium.

Front 1932

Mist

Back 1932

A dispersion of fine liquid droplets in a gaseous medium. [68, 2007]

Front 1933

Mitigation

Back 1933

Action that moderates the severity of a fire hazard or risk.

Front 1934

Mitigation

Back 1934

Action that moderates the severity of a fire hazard or risk. [1144, 2002]

Front 1935

Mitigation

Back 1935

Activities taken to reduce the severity or consequences of an emergency.

Front 1936

Mixed Occupancy

Back 1936

A multiple occupancy where the occupancies are intermingled.

Front 1937

Mixer

Back 1937

Equipment used to combine and level match a multiplicity of electronic signals, such as from microphones, electronic instruments, and recorded audio.

Front 1938

Mixer-Amplifier

Back 1938

Equipment that combines the functions of a mixer and amplifier within a single enclosure.

Front 1939

Mixing Blower

Back 1939

A motor-driven blower to produce gas-air mixtures for combustion through one or more gas burners or nozzles on a single-zone industrial heating appliance or on each control zone of a multizone industrial appliance or on each control zone of a multizone installation.

Front 1940

Mixing Blower

Back 1940

A motor-driven blower to supply air-fuel gas mixtures for combustion through one or more fuel burners or nozzles on a single-zone industrial heating appliance or on each control zone of a multizone installation. Mixing machines operated at 10 in. w.c. (2.49 kPa) or less static pressure are considered mixing blowers.

Front 1941

Mixing Building

Back 1941

Any building used primarily for mixing and blending of propellant, delay, or ejection compositions.

Front 1942

Mixing Building

Back 1942

Any building used primarily for mixing and blending of pyrotechnic compositions.

Front 1943

Mixing Chamber

Back 1943

A device used to mix foam solution and air.

Front 1944

Mixing Machine

Back 1944

An externally powered mechanical device that mixes fuel and air, and compresses the resultant mixture to a pressure suitable for delivery to its point of use.

Front 1945

Mix Ratio

Back 1945

The proportion of foam concentrate in the foam solution, expressed as a volume percentage.

Front 1946

Mix Ratio

Back 1946

The proportion of foam concentrate in the foam solution expressed as a volume percentage. [1150, 2004]

Front 1947

Mix Tank

Back 1947

A portable or fixed agitated vessel in which intermediate or finished products are manufactured, adjusted, and held pending disposition.

Front 1948

Mobile

Back 1948

X-ray equipment mounted on a permanent base with wheels and/or casters for moving while completely assembled.

Front 1949

Mobile Acetylene Trailer
System

Back 1949

A manifolded group of cylinders held together as a unit on a
transport vehicle for the purpose of containing and transporting large
quantities of acetylene.

Front 1950

Mobile Acetylene Trailer
System

Back 1950

A manifolded group of cylinders held together as a unit on a
transport vehicle for the purpose of containing and transporting large
quantities of acetylene. [51, 2002]

Front 1951

Mobile Container

Back 1951

A container that is permanently mounted on a vehicle and connected for uses other than supplying engine fuel.

Front 1952

Mobile Emergency Hospital
(MEH)

Back 1952

A specialized, self-contained vehicle that can provide a clinical environment that enables a physician to provide definitive treatment for serious injuries at the accident scene.

Front 1953

Mobile Equipment

Back 1953

Any equipment in use without its own motive power train and normally moved by self-propelled equipment.

Front 1954

Mobile Equipment

Back 1954

Equipment with electrical components suitable to be moved only with mechanical aids or is provided with wheels for movement by
person(s) or powered devices.

Front 1955

Mobile Equipment

Back 1955

Wheeled, skid-mounted, track-mounted, or rail-mounted equipment capable of moving or being moved.

Front 1956

Mobile Foam Fire Apparatus

Back 1956

Fire apparatus with a permanently mounted fire pump, foam proportioning system, and foam concentrate tank(s) whose primary purpose is for use in the control and extinguishment of flammable and combustible liquid fires in storage tanks and other flammable liquid spills.

Front 1957

Mobile Foam Fire Apparatus

Back 1957

Fire apparatus with a permanently mounted fire pump, foam proportioning system, and foam concentrate tank(s) whose primary purpose is for use in the control and extinguishment of flammable and combustible liquid fires in storage tanks and other flammable liquid spills. [1901, 2003]

Front 1958

Mobile Home

Back 1958

A factory-assembled structure or structures transportable in one or more sections that are built on a permanent chassis and designed to be used as a dwelling without a permanent foundation where connected to the required utilities and that include the plumbing, heating, air-conditioning, and electrical systems contained therein.

Front 1959

Mobile Home Accessory
Building or Structure

Back 1959

Any awning, cabana, ramada, storage cabinet, carport, fence, windbreak, or porch established for the use of the occupant of the mobile home on a mobile home lot.

Front 1960

Mobile Home Lot

Back 1960

A designated portion of a mobile home park designed for the accommodation of one mobile home and its accessory buildings or structures for the exclusive use of its occupants.

Front 1961

Mobile Home Park

Back 1961

A contiguous parcel of land that is used for the accommodation of occupied mobile homes.

Front 1962

Mobile Home Service
Equipment

Back 1962

The equipment containing the disconnecting means, overcurrent protective devices, and receptacles or other means for connecting a mobile home feeder assembly.

Front 1963

Mobile Intensive Care Unit

Back 1963

An ambulance-type unit with space, equipment, supplies, communications, and treatment capabilities necessary for supportive, definitive, and therapeutic emergency medical care for the ill or injured either on site or during transport.

Front 1964

Mobile Property Type

Back 1964

Property that was designed to be movable in relation to fixed property regardless of whether the property is currently movable, for example, vehicles, ships, and airplanes. (See 6.7.4.)

Front 1965

Mobile Refueling

Back 1965

A DOT-approved vehicle with tank(s) and pump(s) that dispenses engine fuel directly to vehicles.

Front 1966

Mobile Shelving

Back 1966

A system of records storage, usually a type of open-shelf file equipment, also known as track files, compaction files, or movable files, in which sections or rows of shelves are manually or electrically moved on tracks to provide access aisles.

Front 1967

Mobile Supply Unit

Back 1967

Any supply source that is equipped with wheels so it is able to be moved around.

Front 1968

Mobile System

Back 1968

Any type of foam-producing unit that is mounted on wheels and that
is self-propelled or towed by a vehicle and can be connected to a water
supply or can utilize a premixed foam solution.

Front 1969

Mobile Unit

Back 1969

A two-way radio-equipped vehicle or person; also a two-way radio by itself that is associated with a vehicle or person.

Front 1970

Mobile Water Supply
Apparatus (Tanker, Tender)

Back 1970

A vehicle designed primarily for the safe and effective pickup, transport, and delivery of water to fire emergency scenes where other apparatus or pumping equipment provide tactical fire stream application.

Front 1971

Mobile Water Supply
Apparatus (Tanker, Tender)

Back 1971

A vehicle designed primarily for transporting (pickup, transporting, and delivering) water to fire emergency scenes to be applied by other vehicles or pumping equipment.

Front 1972

Mobile Water Supply
Apparatus (Tanker, Tender)

Back 1972

A vehicle designed primarily for transporting (pickup, transporting, and delivering) water to fire emergency scenes to be applied by other vehicles or pumping equipment. [1901, 2003]

Front 1973

Mobile Water Supply
Apparatus (Tanker, Tender)

Back 1973

A vehicle designed primarily for transporting (pickup, transporting, and delivering) water to fire emergency scenes to be applied by other vehicles or pumping equipment. [1901, 2009]

Front 1974

Model

Back 1974

A mathematical characterization intended to predict a physical phenomenon.

Front 1975

Model

Back 1975

A simulation of an event.

Front 1976

Model

Back 1976

The collective term used to identify a group of elements or items of the same basic design and components from a single manufacturer produced by the same manufacturing and quality assurance procedures that are covered by the same certification.

Front 1977

Model

Back 1977

The collective term used to identify a group of individual elements of the same basic design and components from a single manufacturer produced by the same manufacturing and quality assurance procedures that are covered by the same certification.

Front 1978

Model

Back 1978

The collective term used to identify a group of individual elements of the same basic design and components from a single manufacturer produced by the same manufacturing and quality assurance procedures that are covered by the same certification. [1971, 2007]

Front 1979

Model

Back 1979

The collective term used to identify a group of individual elements or items of the same basic design and components from a single manufacturer produced by the same manufacturing and quality assurance procedures that are covered by the same certification.

Front 1980

Model

Back 1980

The collective term used to identify a group of individual liquid splash-protective ensembles or protective clothing of the same basic design and components from a single manufacturer produced by the same manufacturing and quality assurance procedures that are covered by the same certification.

Front 1981

Model

Back 1981

The collective term used to identify a group of individual
vapor-protective ensembles or elements of the same basic design and
components from a single manufacturer produced by the same
manufacturing and quality assurance procedures that are covered by
the same certification.

Front 1982

Model Rocket

Back 1982

A rocket that (1) weighs more than 1500 g (53 oz) with motors installed; and (2) is propelled by one or more model rocket motors having an installed total impulse of no more than 320 N-sec (71.9
lb-sec); and (3) contains no more than a total of 125 g (4.4 oz) of propellant weight. [1122, 2008]

Front 1983

Model Rocket

Back 1983

A rocket that (1) weighs no more than 1500 g (53 oz) with motors installed; and (2) is propelled by one or more model rocket motors having an installed total impulse of no more than 320 N-sec (71.9
lb-sec); and (3) contains no more than a total of 125 g (4.4 oz) of propellant weight.

Front 1984

Model Rocket Motor

Back 1984

A rocket motor that has a total impulse of no greater than 160 N-sec (36 lb-sec), an average thrust of no greater than 80 N (18 lbf), and a propellant weight of no greater than 62.5 g (2.2 oz).

Front 1985

Model Rocket Motor

Back 1985

A rocket motor that has a total impulse of no greater than 160 N-sec (36 lb-sec), an average thrust of no greater than 80 N (18 lbf), and a propellant weight of no greater than 62.5 g (2.2 oz), and that otherwise meets the other requirements set forth in NFPA 1125, Code for the Manufacture of Model Rocket and High Power Rocket Motors.

Front 1986

Model Rocket Motor

Back 1986

A rocket motor that has a total impulse of no greater than 160 N-sec (36 lb-sec), an average thrust of no greater than 80 N (18 lbf), and a propellant weight of no greater than 62.5 g (2.2 oz), and that otherwise meets the other requirements set forth in NFPA 1125, Code for the Manufacture of Model Rocket and High Power Rocket Motors. [1122,
2002]

Front 1987

Model Uncertainty

Back 1987

Uncertainty in the predictions of a model related to the equations in the model being correct, whether or not they are appropriate to the problem being solved, and whether or not they are sufficiently complete.

Front 1988

Modem (Modulator/ Demodulator Unit)

Back 1988

A device that converts data that is compatible with data-processing equipment to a form that is compatible with transmission equipment, and vice versa.

Front 1989

Mode of Transmission

Back 1989

The physical means of entry of a hazardous material into the human body, including inhalation, absorption, injection, and ingestion.

Front 1990

Modification

Back 1990

An alteration or adjustment to any component that is a deviation from the original specifications or design of the fire apparatus.

Front 1991

Modification

Back 1991

The reconfiguration of any space; the addition or elimination of any door or window; the addition or elimination of load-bearing elements; the reconfiguration or extension of any system; or the installation of any additional equipment.

Front 1992

Modification

Back 1992

The reconfiguration of any space, the addition or elimination of any door or window, the addition or elimination of load-bearing elements, the reconfiguration or extension of any system, or the installation of any additional equipment. [5000, 2006]

Front 1993

Module

Back 1993

A complete, environmentally protected unit consisting of solar cells, optics, and other components, exclusive of tracker, designed to generate dc power when exposed to sunlight.

Front 1994

Module

Back 1994

A pyrotechnic component of a hybrid or reloadable rocket motor in which its chemical composition is preloaded into a finished assembly that does not necessitate mixing of ingredients by the user.

Front 1995

Module

Back 1995

A pyrotechnic component of a hybrid or solid propellant reloadable rocket motor in which the chemical composition is loaded into a finished assembly by the manufacturer.

Front 1996

Module

Back 1996

A pyrotechnic component of a reloadable model rocket motor in which the chemical composition is loaded into a finished assembly by the manufacturer.

Front 1997

Moist Curing

Back 1997

A method for the retention of moisture for hydration of portland cement plaster.

Front 1998

Moisture Barrier

Back 1998

The component of an element or item that principally prevents the transfer of liquids.

Front 1999

Moisture Barrier

Back 1999

The component of an ensemble element or item that principally prevents the transfer of liquids.

Front 2000

Moisture Content (Wet Basis)

Back 2000

The maximum percentage of water that can be driven off a sample through drying as a percentage of the original sample weight.

Front 2001

Molten Salt Bath Furnace

Back 2001

A furnace that employs salts heated to a molten state, excluding aqueous alkaline baths, hot brine, or other systems utilizing salts in solution.

Front 2002

Momentary Rating

Back 2002

A rating based on an operating interval that does not exceed
5 seconds.

Front 2003

Momentary Switch

Back 2003

A switch that returns to the neutral position (off) when released.

Front 2004

Momentary Switch

Back 2004

A switch that returns to the neutral position (off) when released. [1901, 2003]

Front 2005

Monitor

Back 2005

A device designed to be fed by one or more hose lines or to be fed by rigid piping and to hold and direct a nozzle.

Front 2006

Monitor

Back 2006

A fixed master stream device, manually or remotely controlled, or both, capable of discharging large volumes of water or foam.

Front 2007

Monitor

Back 2007

To listen to or observe message traffic without transmitting a response.

Front 2008

Monitor

Back 2008

To sense and indicate a condition without initiating automatic corrective action.

Front 2009

Monitor Hazard Current

Back 2009

The hazard current of the line isolation monitor alone. (ELS)

Front 2010

Monitoring Equipment

Back 2010

Instruments and devices used to identify and quantify contaminants.

Front 2011

Monitoring for Integrity

Back 2011

Automatic monitoring of circuits and other system components for the existence of defects or faults that interfere with receiving or transmitting an alarm.

Front 2012

Monitoring Regulator

Back 2012

A pressure regulator set in series with another pressure regulator for the purpose of automatically taking over in an emergency the control of the pressure downstream of the regulator in case that pressure tends to exceed a set maximum.

Front 2013

Monitoring Station

Back 2013

A facility that receives signals from electronic premises security systems and has personnel in attendance at all times to respond to these signals.

Front 2014

Monitor Nozzle

Back 2014

A device specifically designed with large, clear waterways to provide a powerful, far-reaching stream for the protection of large amounts of combustible materials, aircraft, tank farms, and any other special hazard locations where large amounts of water need to be instantly available without the delay of laying hose lines. The nozzle is normally fitted with one of three interchangeable tips that measure 11⁄2 in., 13⁄4 in., and 2 in. (40 mm, 45 mm, and 50 mm) in diameter.

Front 2015

Monitor Nozzle Hydrant

Back 2015

A hydrant equipped with a monitor nozzle capable of delivering more than 250 gpm (946 L/min).

Front 2016

Monitor Panel

Back 2016

A device that is located at a position remote from the system being monitored (usually at the bridge) and that indicates the condition of the system being monitored.

Front 2017

Monomer

Back 2017

An unsaturated organic compound whose molecules contain reactive groups that polymerize with each other or with other monomer molecules to produce polymers.

Front 2018

Monorail

Back 2018

Overhead track and hoist system for moving material around the boatyard or moving and launching boats.

Front 2019

Mooring

Back 2019

(1) Equipment, such as anchors, chains, or lines, for holding fast a vessel. (2) The act of securing a vessel. (3) A location at which a vessel can be moored. (4) Any location where a boat is wet-stored or berthed.

Front 2020

Mooring

Back 2020

(1) Permanent anchor equipment (attached by a chain to a buoy) to which a vessel can connect a line, wire, or chain, eliminating the need to use the vessel’s anchor. (2) The act of securing a vessel. (3) The location where a vessel is berthed.

Front 2021

Mooring(s)

Back 2021

Any place where a boat is wet stored or berthed.

Front 2022

Moorings

Back 2022

Methods of securing a vessel within a given area.

Front 2023

Mop Up

Back 2023

The act of making a fire safe after it is controlled, such as extinguishing or removing burning material along or near the control line, felling dead trees (snags), and trenching logs to prevent rolling.

Front 2024

Mop-up

Back 2024

The act of making a wildland fire scene safer after the fire has been controlled, such as extinguishing or removing burning material along or near the control line, felling snags, and trenching logs to prevent rolling. (For structure fires, see 3.3.77, Overhaul.)

Front 2025

Morbidity

Back 2025

The state of being diseased.

Front 2026

Mortar

Back 2026

A device used to direct and control the effect of the pyrotechnic material.

Front 2027

Mortar

Back 2027

A tube from which certain aerial devices are fired into the air.

Front 2028

Mortar Rack

Back 2028

A frame containing one or more mortars.

Front 2029

Mortar Trough

Back 2029

Aboveground structure filled with sand or similar material into which mortars are positioned.

Front 2030

Motion Picture Studio (Lot)

Back 2030

A building or group of buildings and other structures designed, constructed, or permanently altered for use by the entertainment industry for the purpose of motion picture or television production.

Front 2031

Motor Control Center

Back 2031

An assembly of one or more enclosed sections having a common power bus and principally containing motor control units.

Front 2032

Motor Control Center

Back 2032

An assembly of one or more enclosed sections having a common power bus and principally containing motor control units.
[70, 2008]

Front 2033

Motor Control Circuit

Back 2033

The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.

Front 2034

Motor Craft

Back 2034

Any boat that is propelled by other than wind or human power.

Front 2035

Motor Freight Terminal

Back 2035

The area where the overall operation of freight transfer, vehicle repair and service, truck parking, and administrative functions are performed.

Front 2036

Motor Fuel Dispensing Facility

Back 2036

That portion of a property where motor fuels are stored and dispensed from fixed equipment into the fuel tanks of motor vehicles or marine craft or into approved containers, including all equipment used in connection therewith.

Front 2037

Motor Fuel Dispensing Facility

Back 2037

That portion of a property where motor fuels are stored and dispensed from fixed equipment into the fuel tanks of motor vehicles or marine craft or into approved containers, including all equipment used in connection therewith. [30A, 2008]

Front 2038

Motor Fuel Dispensing Facility

Back 2038

That portion of a property where motor fuels are stored and dispensed from fixed equipment into the fuel tanks of motor vehicles or marine craft or into approved containers, including all equipment used in connection therewith. [30A:3.3.11]

Front 2039

Motor Fuel Dispensing Facility
Located Inside a Building

Back 2039

That portion of a motor fuel dispensing facility located within the perimeter of a building or building structure that also contains other occupancies.

Front 2040

Motor Fuel Dispensing Facility
Located Inside a Building

Back 2040

That portion of a motor fuel dispensing facility located within the perimeter of a building or building structure that also contains other occupancies. [30A, 2008]

Front 2041

Motor-Generator

Back 2041

A machine that consists of a generator driven by an electric motor.

Front 2042

Motor Home

Back 2042

A vehicular unit designed to provide temporary living quarters for recreational, camping, or travel use, built on or permanently attached to a self-propelled motor vehicle chassis or on a chassis cab or van that is an integral part of the completed vehicle.
[1192, 2008] (See also 3.3.19, Recreational Vehicle.)

Front 2043

Motor Home

Back 2043

A vehicular unit designed to provide temporary living quarters for recreational, camping, or travel use built on or permanently attached to a self-propelled motor vehicle chassis or on a chassis cab or van that is an integral part of the completed vehicle. (See Recreational Vehicle.)

Front 2044

Motorist

Back 2044

A motor vehicle occupant, including the driver and passenger(s).

Front 2045

Motor-Reloading Kit

Back 2045

A package designed and produced by a commercial manufacturer that contains all the components and parts necessary to reload and reuse a reloadable model or high power rocket motor casing.

Front 2046

Motor Reloading Kit

Back 2046

A product manufactured by a commercial manufacturer that contains the components and parts used to reload and reuse a reloadable rocket motor casing.

Front 2047

Motor Speed

Back 2047

The speed indicated on the motor nameplate.

Front 2048

Motorsports Safety Awareness
Level

Back 2048

A designation for the capability expected of an individual who has been given basic safety information as provided by the venue/event emergency action plan.

Front 2049

Motorsports Safety Command
Manager

Back 2049

An individual in management assigned to oversee the direction and supervision of the venue/event emergency action plan and operations.

Front 2050

Motorsports Safety Operations
Level

Back 2050

A designation for the capability expected of operations personnel that pertains to their specific responsibilities and duties as provided by the venue/event emergency action plan.

Front 2051

Motorsports Safety Specialist
Level

Back 2051

A designation for the capability expected of highly specialized personnel that pertains to the performance of their specific areas of rescue or emergency expertise as provided by the venue/event emergency action plan.

Front 2052

Motorsports Safety Technician
Level

Back 2052

A designation for the capability expected of emergency personnel that pertains to the implementation of rescue procedures as provided by the venue/event emergency action plan.

Front 2053

Motorsports Venue

Back 2053

A facility or designated area at which motorsports and related activities are conducted.

Front 2054

Motor Vehicle

Back 2054

Any self-propelled vehicle, truck, tractor, semitrailer, or truck-trailer combination used for the transportation of freight over public highways.

Front 2055

Motor Vehicle

Back 2055

Any self-propelled vehicle, truck, tractor, semitrailer, or truck-trailer combination used for the transportation of freight over public highways. [495, 2006]

Front 2056

Motor Vehicle Fluid

Back 2056

A fluid that is a flammable, combustible, or hazardous material, such as crankcase fluids, fuel, brake fluids, transmission fluids, radiator fluids, and gear oil.

Front 2057

Moulage

Back 2057

A reproduction of a skin lesion, tumor, wound, or other pathological state. Applied for realism to simulate injuries in emergency exercises.

Front 2058

Mounded Container

Back 2058

An ASME container designed for underground service installed above the minimum depth required for underground service and covered with earth, sand, or other material, or an ASME container designed
for aboveground service installed above grade and covered with earth, sand, or other material.

Front 2059

Mounded Container

Back 2059

An ASME container designed for underground service installed above the minimum depth required for underground service and covered with earth, sand, or other material, or an ASME container designed
for aboveground service installed above grade and covered with earth, sand, or other material. [58, 2008]

Front 2060

Movable Fuel Storage Tender

Back 2060

A container equipped with wheels (including a farm cart) not in excess of 1200 gal (4.5 m3) water capacity that is moved from one location to another.

Front 2061

Movable Racks

Back 2061

Racks on fixed rails or guides.

Front 2062

Movable Racks

Back 2062

Racks on fixed rails or guides. They can be moved back and forth only in a horizontal, two-dimensional plane. A moving aisle is created as abutting racks are either loaded or unloaded, then moved across the aisle to abut other racks.

Front 2063

Move Exposed

Back 2063

Safely relocate the exposed to safety.

Front 2064

Movement Area

Back 2064

That part of an airport to be used for the takeoff, landing, and taxiing of aircraft, and the apron(s).

Front 2065

MPa

Back 2065

Absolute pressure in mega-Pascals.

Front 2066

MPa

Back 2066

Absolute pressure in mega-Pascals. [58, 2008]

Front 2067

MPag

Back 2067

Gauge pressure in mega-Pascals.

Front 2068

MPag

Back 2068

Gauge pressure in mega-Pascals. [58, 2008]

Front 2069

MSDS

Back 2069

Material safety data sheets.

Front 2070

Mucous Membrane

Back 2070

A moist layer of tissue that lines the mouth, eyes, nostrils, vagina, anus, or urethra.

Front 2071

Muffle

Back 2071

An enclosure within a furnace to separate the source of heat from the work and from any special atmosphere that might be required for the process.

Front 2072

Mullion

Back 2072

A fixed or removable vertical member set in a double door opening that allows both leaves to be active or set between a door and a side light or a separate, framed, glazed area.

Front 2073

Multi-Agency Coordination
Systems (MACS)

Back 2073

A system that provides the architecture to support coordination for incident prioritization, critical resource allocation, communications systems integration, and information coordination.

Front 2074

Multi-Agency Coordination
Systems (MACS)

Back 2074

Systems that provide the architecture to support coordination for incident prioritization, critical resource allocation, communications systems integration, and information coordination.

Front 2075

Multi-Casualty Incident (MCI)

Back 2075

An emergency casualty incident involving multiple persons with bodily injuries that exceeds the capacity of the medical resources available at the motorsports venue/event.

Front 2076

Multi-Criteria Detector

Back 2076

A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same stimulus. This sensor is capable of generating only one alarm signal from the sensors employed in the design either independently or in combination. The sensor output signal is mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This detector has a single listing that establishes the primary function of the detector. [72, 2007]

Front 2077

Multi-Criteria Detector

Back 2077

A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same stimulus. This sensor is capable of generating only one alarm signal from the sensors employed in the design either independently or in combination. The sensor output signal is mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This detector has a single listing that establishes the primary function of the detector. (SIG-IDS)

Front 2078

Multi-Cycle System

Back 2078

A type of sprinkler system capable of repeated on-off flow cycles in response to heat.

Front 2079

Multi-Employer Workplace

Back 2079

A workplace where there is a host employer and at least one contract employer.

Front 2080

Multifamily Dwelling

Back 2080

A building that contains three or more dwelling units.

Front 2081

Multi-Jurisdictional Incident

Back 2081

An incident requiring action from multiple agencies that each have jurisdiction to manage certain aspects of an incident or planned event.

Front 2082

Multilevel Play Structure

Back 2082

A structure that consists of tubes, slides, crawling areas, and jumping areas that is located within a building and is used for climbing and entertainment, generally by children.

Front 2083

Multioutlet Assembly

Back 2083

A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.

Front 2084

Multiple Casualty

Back 2084

Injury or death of more than one individual in an incident.

Front 2085

Multiple Configuration

Back 2085

Variable configurations or positions of the aerial device (e.g., elevation, extension) in which a manufacturer’s different rated load capacities are allowed.

Front 2086

Multiple Dwelling Unit

Back 2086

A building containing three or more dwelling units. (SIG-HOU)

Front 2087

Multiple-Fueled Appliance

Back 2087

An appliance that is designed and intended to burn either solid, liquid, or gaseous fuels, or a combination of these.

Front 2088

Multiple Fuse

Back 2088

An assembly of two or more single-pole fuses.

Front 2089

Multiple-Injection
Pressurization System

Back 2089

A type of smoke-control system that has pressurization air supplied from multiple locations.

Front 2090

Multiple Jacket

Back 2090

A construction consisting of a combination of two separately woven reinforcements (double jacket) or two or more reinforcements interwoven.

Front 2091

Multiple Occupancy

Back 2091

A building or structure in which two or more classes of occupancy exist.

Front 2092

Multiple Opening Door Frame

Back 2092

A door assembly that consists of more than two doors.

Front 2093

Multiple-Point Anchor System

Back 2093

System configuration providing load distribution over more than one anchor point, either proportionally or disproportionally.

Front 2094

Multiple-Port Burner

Back 2094

A burner having two or more separate discharge openings or ports.

Front 2095

Multiple-Purpose Alarm

Back 2095

An alarm that incorporates detection capabilities for more than one hazardous condition, such as fire, fuel gas, or carbon monoxide.

Front 2096

Multiple Retort Stoker

Back 2096

An underfeed stoker consisting of two or more retorts, parallel and adjacent to each other, but separated by a line of tuyeres, and arranged so that the refuse is discharged at the ends of the retorts.

Front 2097

Multiple-Row Racks

Back 2097

Racks greater than 12 ft (3.7 m) in depth or single- or double-row racks separated by aisles less than 3.5 ft (1.1 m) wide having an overall width greater than 12 ft (3.7 m).

Front 2098

Multiple-Row Racks

Back 2098

Racks greater than 12 ft (3.7 m) in depth or single- or double-row racks separated by aisles less than 3.5 ft (1.1 m) wide having an overall width greater than 12 ft (3.7 m). [13, 2007]

Front 2099

Multiple Station Alarm

Back 2099

A single station alarm capable of being interconnected to one or more additional alarms so that the actuation of one causes the appropriate alarm signal to operate in all interconnected alarms. (SIG-HOU)

Front 2100

Multiple Station Alarm Device

Back 2100

Two or more single-station alarm devices that can be interconnected so that actuation of one causes all integral audible alarms to operate; or one single-station alarm device having connections to other detectors or to a manual fire alarm box.

Front 2101

Multiple Station Alarm Device

Back 2101

Two or more single station alarm devices that can be interconnected so that actuation of one causes all integral or separate audible alarms to operate; or one single station alarm device having connections to other detectors or to a manual fire alarm box. [72, 2007]

Front 2102

Multiple Station Alarm Device

Back 2102

Two or more single station alarm devices that can be interconnected so that actuation of one causes all integral or separate audible alarms to operate; or one single station alarm device having connections to other detectors or to a manual fire alarm box. (SIG-HOU)

Front 2103

Multiple Station [Carbon
Monoxide] Alarm

Back 2103

A single station [carbon monoxide] alarm capable of being interconnected to one or more additional alarms so that the actuation of one causes the appropriate alarm signal to operate in all interconnected alarms. [72, 2007]

Front 2104

Multiple Treatment Facility

Back 2104

A diagnostic or treatment complex under a single management comprising a number of single treatment facilities, which can be accessed one from the other without exiting the facility (i.e., does not involve widely separated locations or separate distinct practices). (ADM)

Front 2105

Multiple Trip Verification
(MTV)

Back 2105

A method to validate an alarm signal by any of the following: (1) connection of sensors in a manner such that more than one sensor must be in alarm before an alarm signal is transmitted to the monitoring station, or (2) verification algorithm in an electronic premises security system that interprets multiple sensor inputs, or (3) procedural methods or programs employed by monitoring station personnel to interpret multiple alarm signals from a protected premises.

Front 2106

Multiple Use

Back 2106

Items that are designed to be repeatedly worn and used for protection during emergency medical operations.

Front 2107

Multiplexing

Back 2107

A signaling method characterized by simultaneous or sequential transmission, or both, and reception of multiple signals on a signaling line circuit, a transmission channel, or a communications channel, including means for positively identifying each signal. (SIG-SSS)

Front 2108

Multipoint Grounding

Back 2108

Multipoint grounding consists of interconnecting primary and secondary neutrals of the transformer. The secondary and primary neutral are common, and they both utilize the same grounding electrode that connects the system to earth.

Front 2109

Multipurpose Assembly
Occupancy

Back 2109

An assembly room designed to accommodate temporarily any of several possible assembly uses.

Front 2110

Multipurpose Dry Chemical

Back 2110

Ammonium phosphate-based extinguishing agent that is effective on fires involving both ordinary combustibles, such as wood or paper, and fires involving flammable liquids.

Front 2111

Multipurpose Passenger
Vehicle

Back 2111

A motor vehicle with motive power, with the exception of a trailer, designed to carry 10 or fewer persons that is constructed on a truck chassis or with special features for occasional off-road operations.

Front 2112

Multipurpose Piping System

Back 2112

A piping system intended to serve both domestic and fire protection needs.

Front 2113

Multi-Sensor Detector

Back 2113

A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same stimulus. A device capable of generating multiple alarm signals from any one of the sensors employed in the design, independently or in combination. The sensor output signals are mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This device has listings for each sensing method employed. [72, 2007]

Front 2114

Multi-Sensor Detector

Back 2114

A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same stimulus. A device capable of generating multiple alarm signals from any one of the sensors employed in the design, independently or in combination. The sensor output signals are mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This device has listings for each sensing method employed. (SIG-IDS)

Front 2115

Multitier Book Stack

Back 2115

A system of back-to-back metal (steel or wrought iron) bracket shelving stacked by being bolted together into multiple levels or tiers at approximately 7 ft (2.1 m) intervals to form a book stack with walkways for each tier suspended from the posts or columns supporting the bracket shelving sections in each range.

Front 2116

Multi-Use Facility

Back 2116

A motorsports venue that incorporates more than one type of course and is adaptable to a variety of motorsports disciplines.

Front 2117

Municipal Fire Alarm Box
(Street Box)

Back 2117

A publicly accessible fire alarm box. See 3.3.63, Fire Alarm Box.

Front 2118

Municipal Fire Alarm System

Back 2118

A public fire alarm reporting system. (SIG-PRS)

Front 2119

Municipal Fire Alarm System

Back 2119

See 3.3.67, Fire Alarm System.

Front 2120

Municipal Solid Waste (MSW)

Back 2120

Solid waste materials consisting of commonly occurring residential and light commercial waste.

Front 2121

Municipal Solid Waste (MSW)

Back 2121

Solid waste materials consisting of commonly occurring residential and light commercial waste. [850, 2005]

Front 2122

Municipal-Type Water System

Back 2122

A system having water pipes servicing fire hydrants and designed to furnish, over and above domestic consumption, a minimum of 250 gpm (950 L/min) at 20 psi (138 kPa) residual pressure for a 2-hour duration.

Front 2123

Municipal-Type Water System

Back 2123

A system having water pipes serving hydrants and designed to furnish, over and above domestic consumption, a minimum flow of 250 gpm (950 L/min) at 20 psi (139 kPa) residual pressure for a 2-hour duration. [1141, 2003]

Front 2124

Muntin

Back 2124

A bar member supporting and separating panes of glass within a sash, door, or glazing frame.

Front 2125

Museum

Back 2125

An institution that acquires, conserves, researches, communicates, and exhibits material evidence of people and their environment for purposes of study, education, and enjoyment.

Front 2126

Museum

Back 2126

Any building or place where cultural, scientific, or artistic items of intrinsic cultural value and interest are kept or exhibited to the public.

Front 2127

Mutual Aid

Back 2127

Reciprocal assistance by emergency services under a prearranged plan.

Front 2128

Mutual Aid

Back 2128

Reciprocal assistance by emergency services under a prearranged plan. [402, 2008]

Front 2129

Mutual Aid

Back 2129

Reciprocal assistance by emergency services under a prearranged plan. [402:3.3]

Front 2130

Mutual Aid

Back 2130

Reciprocal assistance by emergency services under a prearranged plan.
(See also 3.3.1.1, Automatic Aid.) [402:3.3]

Front 2131

Mutual Aid Agreement

Back 2131

A pre-arranged agreement developed between two or more entities to render assistance to the parties of the agreement. [1600, 2004]

Front 2132

Mutual Aid Agreement

Back 2132

A pre-arranged agreement developed between two or more entities to render assistance to the parties of the agreement. [1600:3.3]

Front 2133

Mutual Aid Agreement

Back 2133

Written agreement between agencies and/or jurisdictions that they will assist one another on request, by furnishing personnel, equipment, and/or expertise in a specified manner.

Front 2134

Mutual Aid/Assistance
Agreement

Back 2134

A prearranged agreement between two or more entities to share resources in response to an incident.

Front 2135

mV

Back 2135

Millivolt.

Front 2136

NA

Back 2136

Vent configuration that is not allowed due to potential for condensate formation or pressurization of the venting system or that is not applicable due to physical or geometric restraints.

Front 2137

Naked Cotton Bale

Back 2137

An unwrapped cotton bale secured with wire or steel straps.

Front 2138

Nape Device

Back 2138

A component located below the Bitragion Inion Arc used to aid in helmet retention.

Front 2139

Nape Device

Back 2139

A component used to aid in helmet retention.

Front 2140

Nape Device

Back 2140

A device located below the Bitragion Inion Arc used to aid in helmet retention.

Front 2141

Nasal Cannula

Back 2141

Device consisting of two short tubes to be inserted into the nostrils to administer oxygen or other therapeutic gases. (GAS)

Front 2142

Nasal Catheter

Back 2142

A flexible tube for insertion through the nose into the nasopharynx to administer oxygen or other therapeutic gases. (GAS)

Front 2143

National Association of EMS Physicians (NAEMSP)

Back 2143

A national organization of emergency medical physicians and other professionals.

Front 2144

National Defense Area

Back 2144

An area established on nonfederal lands located in the United States, its territories, or its possessions for the purpose of safeguarding classified defense information or protecting Department of Defense (DOD) equipment, material, or both.

Front 2145

National Highway Traffic Safety Administration (NHTSA)

Back 2145

The agency under the Department of Transportation that is responsible for preventing motor vehicle injuries.

Front 2146

National Hose Thread (NH)

Back 2146

A standard screw thread that has dimensions for inside (female) and outside (male) fire hose connections as defined in NFPA 1963, Standard for Fire Hose Connections.

Front 2147

National Hose Thread (NH)

Back 2147

A standard screw thread that has dimensions for inside (female) and outside (male) fire hose connections as defined in NFPA 1963, Standard for Fire Hose Connections. [1901, 2003]

Front 2148

National Incident Management System (NIMS)

Back 2148

A system mandated by Homeland Security Presidential Directive 5 (HSPD-5) that provides a consistent nationwide approach for federal, state, local, and tribal governments; the private sector; and nongovernmental organizations to work effectively and efficiently together to prepare for, respond to, and recover from domestic incidents, regardless of cause, size, or complexity.

Front 2149

National Incident Management System (NIMS)

Back 2149

A system mandated by Homeland Security Presidential Directive-5 (HSPD-5) that provides a systematic, proactive approach guiding government agencies at all levels, the private sector, and nongovernmental organizations to work seamlessly to prepare for, prevent, respond to, recover from, and mitigate the effects of incidents, regardless of cause, size, location, or complexity, in order to reduce the loss of life or property and harm to the environment.

Front 2150

National Incident Management System (NIMS)

Back 2150

A system mandated by HSPD-5 that provides a consistent, nationwide approach for federal, state, local, and tribal governments; the private sector; and nongovernmental organizations (NGOs) to work effectively and efficiently together to prepare for, respond to, and recover from domestic incidents, regardless of cause, size, or complexity.

Front 2151

National Institutes of Health
(NIH)

Back 2151

An agency of the Public Health Service of the Department of Health and Human Services, responsible for promoting the nation’s health.

Front 2152

National Response Framework

Back 2152

A guide to how the nation conducts all-hazards incident management.

Front 2153

National Response Plan

Back 2153

A plan mandated by HSPD-5 that integrates federal domestic prevention, preparedness, response, and recovery plans into one all-discipline, all-hazards plan.

Front 2154

National Search and Rescue
Plan

Back 2154

A document that identifies responsibilities of U.S. federal agencies and serves as the basis for the National Search and Rescue Manual, which discusses search and rescue organizations, resources, methods, and techniques utilized by the federal government.

Front 2155

National Security Information

Back 2155

Designated information that requires protection in the interest of national defense or foreign relations of the United States, that is, information classified in accordance with Executive Order 12356 and not falling within the definition of Restricted Data or Formerly Restricted Data.

Front 2156

National Standard Hose
Thread (NH)

Back 2156

A standard thread that has dimensions for inside and outside fire hose connection screw threads as defined by NFPA 1963, Standard for Fire Hose Connections. [1963, 2003]

Front 2157

National Transportation and
Safety Board (NTSB)

Back 2157

A U.S. federal agency that is responsible for investigating and determining the probable cause of aircraft accidents.

Front 2158

NAT Max

Back 2158

The maximum input rating of a Category I, draft hood-equipped appliance attached to a vent or connector.

Front 2159

NAT+NAT

Back 2159

The maximum combined appliance input rating of two or more Category I, draft hood-equipped appliances attached to the common vent.

Front 2160

Natural Barricade

Back 2160

A natural outdoor feature(s), such as hills or trees, with a density sufficient to prevent surrounding exposures that require protection from being seen from a magazine or building containing explosives when the trees are bare of leaves.

Front 2161

Natural Barricade

Back 2161

A natural outdoor feature(s), such as hills or trees, with a density sufficient to prevent surrounding exposures that require protection from being seen from a magazine or building containing explosives when the trees are bare of leaves.
[1124, 2006]

Front 2162

Natural Barricade (Explosives or Fireworks)

Back 2162

A natural outdoor feature(s), such as hills or trees, with a density sufficient to prevent surrounding exposures that require protection from being seen from a magazine or building containing explosives when the trees are bare of leaves.
[1124, 2006]

Front 2163

Natural Bodies of Water

Back 2163

Bodies of water such as lakes, streams, ponds, rivers, and other naturally occurring bodies of water, which may vary in depth throughout the year.

Front 2164

Natural-Draft

Back 2164

A cooling tower containing no fans or blowers, in which air movement depends on the difference in densities of the heated air inside the tower and the cooler air outside.

Front 2165

Natural Draft

Back 2165

Draft produced by the difference in the weight of a column of flue gases within a chimney or vent and a corresponding column of air of equal dimension outside the chimney or vent.

Front 2166

Natural Draft

Back 2166

Draft produced by the difference in the weight of a column of flue gases within a chimney or vent and a corresponding column of air of equal dimension outside the chimney or vent. [211, 2006]

Front 2167

Natural Draft

Back 2167

Draft produced by the difference in the weight of a column of flue gases within a chimney or vent system and a corresponding column of air of equal dimension outside the chimney or venting system.

Front 2168

Natural Draft-Type Burner

Back 2168

A burner that depends primarily on the natural draft created in the chimney or venting system to induce the air required for combustion into the burner.

Front 2169

Natural Draft Venting System

Back 2169

A venting system that relies on natural draft to convey the products of combustion.

Front 2170

Natural Gas

Back 2170

A gaseous fuel occurring in nature and consisting mostly of a mixture of organic compounds, normally methane, ethane, propane, and butane. The calorific value of natural gases varies between about 26.1
MJ/m3 and 55.9 MJ/m3 (700 Btu per ft3 and 1500 Btu per ft3), the
majority averaging 37.3 MJ/m3 (1000 Btu per ft3).

Front 2171

Natural Gas

Back 2171

Mixtures of hydrocarbon gases and vapors consisting principally of methane in gaseous form.

Front 2172

Natural Ventilation

Back 2172

The flow of air or gases created by the difference in the pressures or gas densities between the outside and inside of a vent, room, or space.

Front 2173

Nebulizer

Back 2173

A device used for producing an aerosol of water and/or medication within inspired gas supply. (GAS)

Front 2174

Neck Circumference

Back 2174

Upper torso measurement from folded edge to folded edge at the midpoint of the collar width with the garment front closure closed at the top and the top edges of the collar in horizontal alignment, and multiplied by 2 to obtain the circumference.

Front 2175

Needle

Back 2175

A slender, usually sharp, pointed instrument used for puncturing tissues, suturing, drawing blood, or passing a ligature around a vessel.

Front 2176

Negative Pressure

Back 2176

Pressure less than atmospheric. [99, 2005]

Front 2177

Negative Pressure

Back 2177

Pressure less than atmospheric. (GAS)

Front 2178

Negative-Pressure Pneumatic
Conveying System

Back 2178

A pneumatic conveying system that transports material by utilizing gas at less than atmospheric pressure.

Front 2179

Negative Pressure SCBA

Back 2179

An SCBA in which the pressure inside the facepiece, in relation to the pressure surrounding the outside of the facepiece, is negative during any part of the inhalation or exhalation cycle when tested by NIOSH in accordance with 42 CFR 84.

Front 2180

Neglect

Back 2180

Failure to act on behalf of or in protection of an individual in one’s care.

Front 2181

Neon Tubing

Back 2181

Electric-discharge tubing manufactured into shapes that form letters, parts of letters, skeleton tubing, outline lighting, other decorative elements, or art forms, and filled with various inert gases.

Front 2182

Nesting

Back 2182

A method of securing cylinders upright in a tight mass using a contiguous three-point contact system whereby all cylinders in a group have a minimum of three contact points with other cylinders or a solid support structure (for example, a wall or railing).

Front 2183

Nesting

Back 2183

A method of securing cylinders upright in a tight mass using a contiguous three-point contact system whereby all cylinders in a group have a minimum of three contact points with other cylinders or a solid support structure (for example, a wall or railing). [55, 2005]

Front 2184

Net Explosive Weight (NEW)

Back 2184

The aggregate amount of explosive materials, expressed in pounds, contained within buildings, magazines, structures or portions thereof, used to establish quantity-distance (Q-D) relationships.

Front 2185

Net Floor Area

Back 2185

The floor area within the inside perimeter of the outside walls, or the outside walls and fire walls of the building under consideration with deductions for hallways, stairs, closets, thickness of interior walls, columns, or other features.

Front 2186

Net Floor Area

Back 2186

The floor area within the inside perimeter of the outside walls, or the outside walls and fire walls of the building under consideration with deductions for hallways, stairs, closets, thickness of interior walls, columns, or other features. [5000, 2009]

Front 2187

Net Floor Area

Back 2187

The gross floor area minus the area of support columns.

Front 2188

Net Heat of Combustion

Back 2188

The oxygen bomb calorimeter value for the heat of combustion, corrected for the gaseous state of product water.

Front 2189

Net Heat of Combustion

Back 2189

The oxygen bomb calorimeter value for the heat of combustion, corrected for the gaseous state of product water. [271, 2004]

Front 2190

Net Positive Suction Head
(NPSH) (hsv)

Back 2190

The total suction head in meters (feet) of liquid absolute, determined at the suction nozzle, and referred to datum, less the vapor pressure
of the liquid in meters (feet) absolute.

Front 2191

Net Pump Pressure

Back 2191

The sum of the discharge pressure and the suction lift converted to psi or kPa when pumping at draft, or the difference between the discharge pressure and the intake pressure when pumping from a hydrant or other source of water under positive pressure.

Front 2192

Net Pump Pressure

Back 2192

The sum of the discharge pressure and the suction lift converted to psi or kPa when pumping at draft, or the difference between the discharge pressure and the intake pressure when pumping from a hydrant or other source of water under positive pressure.
[1901, 2003]

Front 2193

Net Rate

Back 2193

The total rate of water discharge density, less water wastage due to factors such as wind effects and inaccuracies in nozzle angles of spray.

Front 2194

Net Weight

Back 2194

Total weight of base product and propellant as indicated on aerosol container label.

Front 2195

Network Interface Unit (NIU)

Back 2195

A device that converts a broadband signal into component voice, audio, video, data, and interactive services signals. The NIU provides isolation between the network power and the premises signal circuits. The NIU may also contain primary and secondary protectors.

Front 2196

Network-Powered Broadband
Communications Circuit

Back 2196

The circuit extending from the communications utility’s serving terminal or tap up to and including the NIU.

Front 2197

Network System

Back 2197

A type of multipurpose system utilizing a common piping system supplying domestic fixtures and fire sprinklers where each sprinkler is supplied by a minimum of three separate paths.

Front 2198

Neutral Conductor

Back 2198

The conductor connected to the neutral point of a system that is intended to carry current under normal conditions.

Front 2199

Neutral Conductor

Back 2199

The conductor connected to the neutral point of a system that is intended to carry current under normal conditions. [70, 2008]

Front 2200

Neutral Point

Back 2200

The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a
single-phase portion of a 3-phase delta system, or a midpoint of a
3-wire, direct-current system.

Front 2201

Neutral Point

Back 2201

The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a
single-phase portion of a 3-phase delta system, or a midpoint of a
3-wire, direct-current system. [70, 2008]

Front 2202

Neutral Point

Back 2202

The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a
single-phase portion of a 3-phase delta system, or midpoint of a 3-wire, direct current system.

Front 2203

Neutral Position

Back 2203

The position of operating controls when the controls are not engaged.

Front 2204

New Manufactured Home
Park or Subdivision

Back 2204

For all matters related to installation in flood hazard areas, the term new manufactured home park or subdivision shall mean a home park or subdivision for which the construction of facilities for servicing the sites (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or installation of pads) is completed on or after the effective date of the initial adoption of floodplain management regulations or map by the AHJ.

Front 2205

NH

Back 2205

An American National Fire Hose Connection Screw Thread. (See
Section 5.2.)

Front 2206

Nickel Cadmium (NiCad) Battery

Back 2206

An alkaline storage battery in which the positive active material is nickel oxide, the negative contains the cadmium, and the electrolyte is potassium hydroxide.

Front 2207

NIOSH

Back 2207

National Institute for Occupational Safety and Health of the U.S. Department of Health and Human Services.

Front 2208

NIOSH Approved

Back 2208

Tested and certified by the National Institute for Occupational Safety and Health (NIOSH) of the U.S. Department of Health and Human Services.

Front 2209

NIOSH Certified

Back 2209

Tested and certified by the National Institute for Occupational Safety and Health (NIOSH) of the U.S. Department of Health and Human Services in accordance with the requirements of 42 CFR 84, Subpart H.

Front 2210

Nitrification Tank

Back 2210

A unit process tank for the oxidation of ammonia and nitrogen into nitrates through biochemical actions.

Front 2211

Nitrocellulose

Back 2211

A nitrated cellulose (cotton linters or wood pulp) with a nitrogen content ranging from 10.5 percent to 12.6 percent by weight.

Front 2212

Nitrogen

Back 2212

An element that, at atmospheric temperatures and pressures, exists as a clear, colorless, and tasteless gas; it comprises approximately
four-fifths of the earth’s atmosphere. (GAS)

Front 2213

Nitrogen Narcosis

Back 2213

A condition resembling alcoholic inebriation, which results from breathing nitrogen in the air under significant pressure. (HYP)

Front 2214

Nitrogen NF (Oil-Free, Dry)

Back 2214

Nitrogen complying as a minimum with oil-free, dry nitrogen NF. (PIP)

Front 2215

Nitrous Oxide

Back 2215

An inorganic compound, one of the oxides of nitrogen. It exists as a gas at atmospheric pressure and temperature, possesses a sweetish smell, and is used for inducing anesthesia when inhaled. The oxygen in the compound will be released under conditions of combustion, creating an oxygen-enriched atmosphere. (GAS)

Front 2216

No. 8 Test Detonator

Back 2216

A detonator with 0.40 to 0.45 grams PETN base charge pressed to a specific gravity of 1.4 g/cc and primed with standard weights of primer, depending on manufacturer.

Front 2217

No-Entry Zone

Back 2217

Those areas at an incident scene that no person(s) are allowed to enter, regardless of what personal protective equipment (PPE) they are wearing due to dangerous conditions.

Front 2218

Noise

Back 2218

Undesirable electrical signals in an electrical or electronic circuit.

Front 2219

Noise(less) Ground

Back 2219

The supplemental equipment-grounding electrode installed at machines, or the isolated equipment-grounding conductor, intended to reduce electrical noise.

Front 2220

No-Load Condition

Back 2220

The status of an engine with standard accessories operating without an imposed load, with the vehicle drive clutches and any special accessory clutches in a disengaged or neutral condition.

Front 2221

Nominal Battery Voltage

Back 2221

The voltage calculated on the basis of 2 volts per cell for the lead-acid type and 1.2 volts per cell for the alkali type.

Front 2222

Nominal Dimension (Masonry)

Back 2222

A specified dimension plus an allowance for the joints with which the units are to be laid.

Front 2223

Nominal Dimension (Metal)

Back 2223

A specified dimension or weight plus or minus the specified manufacturing tolerance for the material or product.

Front 2224

Nominal Discharge Current
(In)

Back 2224

Peak value of 8/20 µs current waveform selected by the manufacturer for which an SPD remains functional after 15 surges.

Front 2225

Nominal Loads

Back 2225

The magnitudes of the loads specified in ASCE/SEI 7, Sections 3 through 22 (dead, live, soil, wind, snow, rain, flood and earthquake). [ASCE/SEI 7:1.2]

Front 2226

Nominal Size (Lumber)

Back 2226

The commercial size designation of width and depth, in standard sawn lumber and glued laminated lumber grades, meeting the requirements of USDOC PS 20 for sawn lumber and AF&PA NDS for glued laminated lumber.

Front 2227

Nominal Strength

Back 2227

(1) In general, the capacity of a structure or member to resist the effects of loads, as determined by computations using specified material strengths and dimensions and formulas derived from accepted principles of structural mechanics or by field tests or laboratory tests of scaled models, allowing for modeling effects and differences between laboratory and field conditions. (2) For the purposes of earthquake loading, strength of a member or cross section calculated in accordance with the requirements and assumptions of the strength design methods of ASCE/SEI 7 (or the referenced standards) before application of any strength reduction factors. [ASCE/SEI 7:1.2, 11.2]

Front 2228

Nominal System Voltage

Back 2228

The nominal voltage (rms) of the power frequency supply.

Front 2229

Nominal Voltage

Back 2229

An approximate value of voltage used to identify a type of battery.

Front 2230

Nonabsorbing Ground

Back 2230

Earth or fill that is not readily permeable or absorbent to large quantities of flammable or combustible liquid or water, or both.

Front 2231

Non-Accessible, Concealed
(for Inspections)

Back 2231

Not capable of being exposed for inspection, maintenance, or repair without damage to the chimney or building structure or finish, or without the use of special tools.

Front 2232

Non-Air-Aspirating Discharge
Devices

Back 2232

Devices designed to provide a specific water discharge pattern.

Front 2233

Nonautomatic

Back 2233

Action requiring personal intervention for its control. As applied to an electric controller, nonautomatic control does not necessarily imply a manual controller, but only that personal intervention is necessary.

Front 2234

Nonautomatic Transfer Switch

Back 2234

A device, operated by direct manpower or electrical remote manual control, for transferring one or more load conductor connections from one power source to another.

Front 2235

Nonautomatic Transfer Switch

Back 2235

A device, operated by direct manpower or electrical remote manual control, for transferring one or more load conductor connections from one power source to another. [110, 2005]

Front 2236

Nonautomatic Water Mist
Nozzles (Open)

Back 2236

Nozzles that operate as an entire system or grouping of nozzles, containing open orifices and activating the water flow to the nozzles by an independent detection system.

Front 2237

Nonbearing Wall

Back 2237

Any wall that is not a bearing wall. [ASCE/SEI 7:11.2]

Front 2238

Nonbulk Packaging

Back 2238

Any packaging having a liquid capacity of 119 gal (450 L) or less, a solids capacity of 882 lb (400 kg) or less, or a compressed gas water capacity of 1001 lb (454 kg) or less.

Front 2239

Noncombustible

Back 2239

A material that, in the form in which it is used and under normal conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials.

Front 2240

Noncombustible

Back 2240

A material that, in the form in which it is used and under the conditions anticipated, will not aid combustion or add appreciable heat to an ambient fire. Materials when tested in accordance with ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, and conforming to the criteria contained in Section 7 of the referenced standard are considered noncombustible.

Front 2241

Noncombustible

Back 2241

A material that, in the form in which it is used and under the conditions anticipated, will not aid combustion or add appreciable heat to an ambient fire. Materials, when tested in accordance with ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, and conforming to the criteria contained in Section 8 of the referenced standard, are considered as noncombustible.

Front 2242

Noncombustible

Back 2242

Any material that, in the form in which it is used and under the conditions anticipated, will not ignite and burn nor will add appreciable heat to an ambient fire.

Front 2243

Noncombustible

Back 2243

In semiconductor fabrication facilities, a material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials.

Front 2244

Noncombustible

Back 2244

In the form used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

Front 2245

Noncombustible

Back 2245

Not capable of igniting and burning when subjected to a fire.

Front 2246

Noncombustible

Back 2246

Not capable of igniting and burning when subjected to a fire. [80, 2007]

Front 2247

Noncombustible

Back 2247

Not capable of igniting and burning when subjected to a fire.

Front 2248

Noncombustible

Back 2248

Not capable of supporting combustion.

Front 2249

Noncombustible

Back 2249

Not capable of supporting combustion. [80, 1999]

Front 2250

Noncombustible Containers

Back 2250

Containers constructed of glass or metal that can be coated with a polymeric material no more than 2 mils (50.8 µm) in thickness.

Front 2251

Noncombustible (Hyperbaric)

Back 2251

An adjective describing a substance that will not burn in 95
± 5 percent oxygen at pressures up to 3 ATA (44.1 psia). (HYP)

Front 2252

Noncombustible (Hypobaric)

Back 2252

An adjective describing a substance that will not burn in 95 percent, plus or minus 5 percent oxygen at pressures of
101.325 kPa (760 mm Hg). (HYP)

Front 2253

Noncombustible Material

Back 2253

A material (as defined in NFPA 220, Standard on Types of Building Construction) that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. (PIP)

Front 2254

Noncombustible Material

Back 2254

A material that, in the form in which it is used and under the condition anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Also called incombustible material (not preferred).

Front 2255

Noncombustible Material

Back 2255

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

Front 2256

Noncombustible Material

Back 2256

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136 are considered noncombustible materials.

Front 2257

Noncombustible Material

Back 2257

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136 are considered noncombustible materials. [220, 2006]

Front 2258

Noncombustible Material

Back 2258

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136 are considered noncombustible materials. [55, 2005]

Front 2259

Noncombustible Material

Back 2259

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136 shall be considered noncombustible materials.

Front 2260

Noncombustible Material

Back 2260

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Method of Test for Behavior of Materials in a Vertical Tube Furnace at 750°C, are considered noncombustible materials. [5000, 2006]

Front 2261

Noncombustible Material

Back 2261

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials.

Front 2262

Noncombustible Material

Back 2262

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials. [220, 2009]

Front 2263

Noncombustible Material

Back 2263

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials. [220:2.1]

Front 2264

Noncombustible Material

Back 2264

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials. [5000, 2006]

Front 2265

Noncombustible Material

Back 2265

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C, are considered noncombustible materials.

Front 2266

Noncombustible (Material)

Back 2266

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C, shall be considered noncombustible materials.

Front 2267

Noncombustible Material

Back 2267

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C, shall be considered noncombustible materials.
[5000, 2006]

Front 2268

Noncombustible Material

Back 2268

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C, shall be considered noncombustible materials.
[5000, 2009]

Front 2269

Noncombustible Material

Back 2269

A material that, in the form in which it is used and under the conditions anticipated, will not ignite, support combustion, burn, or release flammable vapors when subjected to fire or heat.

Front 2270

Noncombustible Material

Back 2270

A substance that will not ignite and burn when subjected to a fire.

Front 2271

Noncombustible Material

Back 2271

A substance that will not ignite and burn when subjected to a fire. [220, 2006]

Front 2272

Noncombustible Material

Back 2272

A substance that will not ignite and burn when subjected to a fire. Materials that are reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, shall be considered noncombustible materials.

Front 2273

Noncombustible Material

Back 2273

A substance that will not ignite and burn when subjected to fire. [220,
2006]

Front 2274

Noncombustible Material

Back 2274

In facilities handling radioactive materials, a material not capable of igniting and burning when subjected to fire conditions as defined in an approved fire test.

Front 2275

Noncombustible Material

Back 2275

In nuclear facilities, a material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

Front 2276

Noncombustible Material

Back 2276

In wastewater treatment facilities, a material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat.

Front 2277

Noncombustible Particulate
Solid

Back 2277

Any noncombustible solid material composed of distinct particles or pieces, regardless of size, shape, or chemical composition.

Front 2278

Nonconductive

Back 2278

Possessing the ability to resist the flow of an electric charge.

Front 2279

Nonconductive Liquid

Back 2279

A liquid that has an electrical conductivity less than 50 picosiemens per meter.

Front 2280

Nonconductive Optical Fiber
Cable

Back 2280

These optical fiber cables contain no metallic members and no other electrically conductive materials.

Front 2281

Nonconductor

Back 2281

A material or object that resists the flow of an electric charge.

Front 2282

Nonconfined Space

Back 2282

For purposes of tank entry, cleaning, or repair, a space that previously was a confined space but no longer meets any of the requirements for a confined space or a permit required confined space, such as a tank with a large door sheet cut into the side. (See also 3.3.6, Confined Space, and 3.3.20, Permit Required Confined Space.)

Front 2283

Nonconforming

Back 2283

Not conforming to the requirements of this Code.

Front 2284

Noncontiguous Property

Back 2284

An owner- or user-protected premises where two or more protected premises, controlled by the same owner or user, are separated by a public thoroughfare, body of water, transportation right-of-way, or property owned or used by others. (SIG-SSS)

Front 2285

Nondedicated Smoke-Control
System

Back 2285

A smoke-control system that shares components with some other system(s), such as the building HVAC system, which changes its mode of operation to achieve the smoke-control objective.

Front 2286

Nondedicated Smoke-Control
Systems

Back 2286

Smoke-control systems and components that share components with some other system(s), such as the building HVAC system, and upon activation cause the HVAC system to change its mode of operation in order to achieve the smoke-control objectives.

Front 2287

Nondestructive Testing (NDT)

Back 2287

One of several methods used to inspect a structural component without physically altering or damaging the materials.

Front 2288

Nondisplaceable Valve
Member

Back 2288

A valve member that cannot be moved from its seat by a force applied to the handle or to any exterior portion of the valve.

Front 2289

Nonelectric Delay Device

Back 2289

A detonator with an integral delay element used in conjunction with and capable of being initiated by a detonating impulse.

Front 2290

Non-Encapsulating

Back 2290

A type of CBRN protective ensemble and ensemble elements that provides liquid splash protection, but does not provide vaportight protection, or liquidtight protections, and does not cover the wearer’s respirator.

Front 2291

Nonencapsulating

Back 2291

A type of ensemble that provides liquid splash protection, but does not provide vapor- or gas-tight protection, or liquid-tight protection, and does not cover the wearer’s respirator.

Front 2292

Nonenclosed

Back 2292

Any tank or unit process open to the atmosphere or the area around any open tank or unit process housed in a building or other structure constructed with a roof and having at least 50 percent of the wall area open to the atmosphere. Fixed open louvered panels with effective openings greater than 50 percent of the wall area and evenly distributed over the wall area are considered open to the atmosphere.

Front 2293

Non-Fire-Resistive Building

Back 2293

A building of that type of construction in which the structural members, including walls, partitions, columns, floors, and roofs, do not qualify as fire-resistive as defined herein.

Front 2294

Non-Fire Service Personnel

Back 2294

All persons, including police, utility company employees, non-fire service medical personnel, and civilians, who are involved with an incident but who are not fire service personnel.

Front 2295

Nonflammable

Back 2295

An adjective describing a substance that will not burn under the conditions set forth in the definition of flame resistant. (HYP)

Front 2296

Nonflammable

Back 2296

(1) Not readily capable of burning with a flame. (2) Not liable to ignite and burn when exposed to flame. Its antonym is flammable.

Front 2297

Nonflammable Anesthetic
Agent

Back 2297

Refers to those inhalation agents that, because of their vapor pressure at 37°C (98.6°F) and at atmospheric pressure, cannot attain flammable concentrations when mixed with air, oxygen, or mixtures of oxygen and nitrous oxide. (GAS)

Front 2298

Nonflammable Fluid

Back 2298

A nonflammable dielectric fluid that does not have a flash point and is not flammable in air.

Front 2299

Nonflammable Gas

Back 2299

A gas that does not meet the definition of a flammable gas.

Front 2300

Nonflammable Gas

Back 2300

A gas that does not meet the definition of a flammable gas. [55, 2005]

Front 2301

Nonflammable Special
Atmosphere

Back 2301

A special atmosphere of gases that are known to be nonflammable at any temperature.

Front 2302

No-Niche Luminaire

Back 2302

A luminaire intended for installation above or below the water without a niche.

Front 2303

Nonincendive

Back 2303

Electrical equipment and associated wiring that are incapable, under normal operating conditions, of releasing sufficient electrical or thermal energy to cause ignition of specific hazardous materials in their most easily ignited concentrations in air.

Front 2304

Nonincendive Circuit

Back 2304

A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment is not capable, under specified test conditions, of igniting the flammable gas-air, vapor-air, or dust-air mixture.

Front 2305

Nonincendive Component

Back 2305

A component having contacts for making or breaking an incendive circuit and the contacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas-air or vapor-air mixture. The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion.

Front 2306

Nonincendive Equipment

Back 2306

Equipment having electrical/electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas-air, vapor-air, or dust-air mixture due to arcing or thermal means.

Front 2307

Nonincendive Field Wiring

Back 2307

Wiring that enters or leaves an equipment enclosure and, under normal operating conditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas-air, vapor-air, or dust-air mixture. Normal operation includes opening, shorting, or grounding the field wiring.

Front 2308

Nonincendive Field Wiring
Apparatus

Back 2308

Apparatus intended to be connected to nonincendive field wiring.

Front 2309

Nonintersecting Trench

Back 2309

A trench cut in a straight or nearly straight line with no crossing or converging trench legs or cuts.

Front 2310

Non-Laboratory Area

Back 2310

Any space within a building not included in a laboratory unit. (See also
3.3.36.)

Front 2311

Nonlinear Load

Back 2311

A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.

Front 2312

Nonliquefied Compressed
Gases

Back 2312

Gases, other than those in solution, that are contained in a packaging under the charged pressure and are entirely gaseous at a temperature of 68°F (20°C).

Front 2313

Nonmechanical Emergency
Ventilation System

Back 2313

A system of smoke reservoirs, smoke vents, and/or dampers that are designed to support the tenability criteria without the use of fans.

Front 2314

Nonmetallic Container

Back 2314

A container as defined in 3.3.10, constructed of glass, plastic, fiber, or a material other than metal.

Front 2315

Nonmetallic Extension

Back 2315

An assembly of two insulated conductors within a nonmetallic jacket or an extruded thermoplastic covering. The classification includes surface extensions intended for mounting directly on the surface of walls or ceilings.

Front 2316

Nonmetallic Intermediate Bulk
Container

Back 2316

An intermediate bulk container, as defined in 3.3.10.2, constructed of glass, plastic, fiber, or a material other than metal.

Front 2317

Nonmetallic Portable Tank

Back 2317

A portable tank, as herein defined, constructed of plastic, fiber, or a material other than metal.

Front 2318

Nonmetallic-Sheathed Cable

Back 2318

A factory assembly of two or more insulated conductors enclosed within an overall nonmetallic jacket.

Front 2319

Nonmetallic Underground Conduit with Conductors (NUCC)

Back 2319

A factory assembly of conductors or cables inside a nonmetallic, smooth wall conduit with a circular cross section.

Front 2320

Nonmetallic Wireways

Back 2320

Flame retardant, nonmetallic troughs with removable covers for housing and protecting electrical wires and cables in which conductors are laid in place after the wireway has been installed as a complete system.

Front 2321

Nonmetal Mineral

Back 2321

Belonging to the class of inorganic structural and industrial minerals that do not become metals through metallurgical refining, such as potash, asbestos, sulfur, granite, and rock aggregates.

Front 2322

Non-Power-Limited Fire Alarm
Circuit (NPLFA)

Back 2322

A fire alarm circuit powered by a source that complies with 760.41 and
760.43.

Front 2323

Nonprimary Protective
Garment

Back 2323

A garment or clothing that is not designed nor intended to be the barrier of protection from a specific hazard exposure.

Front 2324

Nonprocess Building

Back 2324

An office building, a warehouse, or other building or area located in a manufacturing facility in which no fireworks, pyrotechnic or explosive composition, pyrotechnic articles, or components containing pyrotechnic or explosive materials are processed or stored.

Front 2325

Nonprocess Building

Back 2325

Any office building, warehouse, or other building located in a rocket motor plant where no explosives are processed or stored.

Front 2326

Nonprofessional Projector

Back 2326

Nonprofessional projectors are those types other than as described in
540.2.

Front 2327

Nonrechargeable (Nonrefillable) Fire Extinguisher

Back 2327

A fire extinguisher not capable of (nor intended to be capable of) undergoing complete maintenance, hydrostatic testing, and being restored to its full operating capability by the standard practices used by fire equipment dealers and distributors.

Front 2328

Nonremovable

Back 2328

An integrated PASS that is not removable and cannot be used independently of the item or items with which it is integrated.

Front 2329

Nonrequired

Back 2329

A fire alarm system component or group of components that is installed at the option of the owner, and is not installed due to a building or fire code requirement. (SIG-FUN)

Front 2330

Nonresidential Appliance,
1400°F

Back 2330

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature not exceeding 1400°F (760°C).

Front 2331

Nonresidential, High-Heat
Appliance

Back 2331

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature exceeding 1800°F (982°C).

Front 2332

Nonresidential, Low-Heat
Appliance

Back 2332

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature not exceeding 1000°F (538°C).

Front 2333

Nonresidential, Low-Heat
Appliance

Back 2333

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature not exceeding 1000°F (538°C). [211, 2006]

Front 2334

Nonresidential, Medium-Heat
Appliance

Back 2334

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature not exceeding 1800°F (982°C).

Front 2335

Nonresidential, Medium-Heat
Appliance

Back 2335

A commercial, industrial, or institutional appliance needing a chimney capable of withstanding a continuous flue gas temperature not exceeding 1800°F (982°C). [211, 2006]

Front 2336

Nonrestorable Initiating
Device

Back 2336

A device in which the sensing element is designed to be destroyed in the process of operation. (SIG-IDS)

Front 2337

Non-Sleeping Suite (Health
Care Occupancies)

Back 2337

A suite without patient beds intended for overnight sleeping.

Front 2338

Nonsparking Metal

Back 2338

A metal that resists producing a spark when impacted with tools, rock, or hard surfaces.

Front 2339

Nonstructural Wall

Back 2339

All walls other than bearing walls or shear walls. [ASCE/SEI 7:11.2]

Front 2340

Nontelecommunications
Equipment Area

Back 2340

An area within a telecommunications facility that is not defined as a telecommunications equipment area, which includes hazard areas such as administrative areas and building services and support areas.

Front 2341

Nonthreaded Coupling or
Adapter

Back 2341

A coupling or adapter in which the mating is achieved with locks or cams but without the use of screw threads.

Front 2342

Nontransit Occupancy Stations

Back 2342

An occupancy not under the control of the system operating authority.

Front 2343

Nonvaporizing Thermal Oil
Heating System

Back 2343

A thermal oil heating system that is designed to operate with the heated oil below its atmospheric boiling point.

Front 2344

No Observed Adverse Effect
Level (NOAEL)

Back 2344

The highest concentration at which no adverse toxicological or physiological effect has been observed.

Front 2345

Normalized Breakthrough
Detection Time

Back 2345

The time at which the permeation rate of a chemical through a material reaches 0.1 µg/cm2/min.

Front 2346

Normally Occupied

Back 2346

An area or space where, under normal circumstances, persons are present.

Front 2347

Normally Occupied Area

Back 2347

One that is intended for occupancy.

Front 2348

Normally Occupied Enclosure or Space

Back 2348

An enclosure or space where one or more persons are present under normal circumstances.

Front 2349

Normally Occupied Enclosure or Space

Back 2349

An enclosure or space where one or more persons are present under normal conditions.

Front 2350

Normally Unoccupied

Back 2350

An area or space not normally occupied by people but that can be entered occasionally for brief periods.

Front 2351

Normally Unoccupied
Enclosure or Space

Back 2351

An enclosure or space not normally occupied but one that could be entered occasionally by one or more persons for brief periods.

Front 2352

Normal Operating Voltage

Back 2352

The normal ac power frequency voltage rating, as specified by the manufacturer, to which the SPD may be connected.

Front 2353

Normal Operation

Back 2353

The regular performance of those functions for which a machine or accessory is designed.

Front 2354

Normal Operations

Back 2354

All modes of nonemergency nuclear power plant operation, ranging from 0 percent to 100 percent power, which include refueling outages but do not include extended outages when fuel is removed from the reactor.

Front 2355

Normal Pressure

Back 2355

Pressure created by forces acting perpendicular to the pipe wall at the point where a pressure tap is made.

Front 2356

Normal Shutdown

Back 2356

Stopping burner operation by shutting off all fuel and ignition energy to the combustion equipment.

Front 2357

Normal Shutdown, High
Steam Pressure Switch

Back 2357

A pressure-actuated device that is arranged to effect a normal burner shutdown when the steam pressure exceeds a preset pressure.

Front 2358

Normal Shutdown, High Water
Temperature Switch

Back 2358

A temperature-actuated device that is arranged to effect a normal burner shutdown when the water temperature exceeds a preset temperature.

Front 2359

Normal Temperature and
Pressure (NTP)

Back 2359

A temperature of 21.1°C (70°F) and a pressure of 1 atmosphere
[101.3 kPa (14.7 psia)]. [5000, 2006]

Front 2360

Normal Temperature and
Pressure (NTP)

Back 2360

A temperature of 21.1°C (70°F) and a pressure of 1 atmosphere
[101.3 kPa (14.7 psia)]. [5000, 2009]

Front 2361

Normal Temperature and
Pressure (NTP)

Back 2361

A temperature of 21°C (70°F) at an absolute pressure of 101.325 kPa
(14.7 psia).

Front 2362

Normal Temperature and
Pressure (NTP)

Back 2362

A temperature of 70°F (21.1°C) and a pressure of 1 atmosphere [14.7 psia (101.3 kPa)].

Front 2363

Normal Vent

Back 2363

An opening, construction method, or device that allows the relief of excessive internal pressure or vacuum during normal storage and operations.

Front 2364

Nose Gear

Back 2364

That mechanical part of a landing gear system mounted under the nose of an aircraft. It can be designed either as a stationary component or one that retracts into the fuselage.

Front 2365

Notification

Back 2365

The time at which an alarm is received and acknowledged at a communications center.

Front 2366

Notification Appliance

Back 2366

A fire alarm system component such as a bell, horn, speaker, light, or text display that provides audible, tactile, or visible outputs, or any combination thereof. [72, 2002]

Front 2367

Notification Appliance

Back 2367

A fire alarm system component such as a bell, horn, speaker, light, or text display that provides audible, tactile, or visible outputs, or any combination thereof. [72, 2007]

Front 2368

Notification Appliance

Back 2368

A fire alarm system component such as a bell, horn, speaker, light, or text display that provides audible, tactile, or visible outputs, or any combination thereof. (SIG-NAS)

Front 2369

Notification Appliance

Back 2369

A [ ] system component such as a bell, horn, speaker, light, or text display that provides audible, tactile, or visible outputs, or any combination thereof. [72, 2007]

Front 2370

Notification Appliance Circuit

Back 2370

A circuit or path directly connected to a notification appliance(s). (SIG-PRO)

Front 2371

Notification Zone

Back 2371

An area covered by notification appliances that are activated simultaneously. (SIG-PRO)

Front 2372

Not Occupied

Back 2372

An area with no persons present; contents or equipment present indicates that the structure is not vacant.

Front 2373

Novelties

Back 2373

Small devices containing limited amounts of pyrotechnic or explosive composition that produce a visible or an audible effect and that are not classified as consumer fireworks.

Front 2374

Nozzle

Back 2374

A constricting appliance attached to the end of a fire hose or monitor to increase the water velocity and form a stream.

Front 2375

Nozzle Mixing Burner

Back 2375

A burner in which the fuel and air are introduced separately to the point of ignition.

Front 2376

Nozzle Pressure

Back 2376

Pressure required at the inlet of a nozzle to produce the desired water discharge characteristics.

Front 2377

Nozzle Pressure

Back 2377

The normal pressure measured at the inlet of the nozzle.

Front 2378

Nozzle Reaction

Back 2378

Force that occurs when a water stream is discharged from the nozzle.

Front 2379

Nozzle Reaction

Back 2379

Force that occurs when a water stream is discharged from the nozzle. [1901, 2003]

Front 2380

Nozzles

Back 2380

A device for use in applications requiring special water discharge patterns, directional spray, or other unusual discharge characteristics.

Front 2381

Nozzles

Back 2381

A device for use in applications requiring special water discharge patterns, directional spray, or other unusual discharge characteristics. [13, 2007]

Front 2382

NPGA

Back 2382

National Propane Gas Association.

Front 2383

NPSH (National Pipe Straight
Hose Thread)

Back 2383

National pipe straight hose coupling thread as specified in ASME B1.20.7, Hose Coupling Screw Threads, Inch.

Front 2384

Nuclear Radiation

Back 2384

The emission from atomic nuclei in various nuclear reactions including alpha, beta, and gamma radiation and neutrons.

Front 2385

Nuclear Safety Function

Back 2385

Any function that is necessary to ensure the integrity of the reactor coolant pressure boundary; the capability to shut down the reactor and maintain it in a safe shutdown condition; or the capability to prevent or mitigate the consequences of nuclear power plant conditions that could result in the potential for a significant fraction of allowable off-site releases.

Front 2386

Nuclear Safety Related

Back 2386

Structures, systems, or components that are required to remain functional to ensure the integrity of the reactor coolant pressure boundary, the capability to shut down the reactor and maintain it in a safe shutdown condition, or the capability to prevent or mitigate the consequences of accidents that could result in potential off-site exposures comparable to regulatory guideline exposures.

Front 2387

Nuisance Alarm

Back 2387

Any alarm caused by mechanical failure, malfunction, improper installation, or lack of proper maintenance, or any alarm activated by a cause that cannot be determined. (SIG-FUN)

Front 2388

Number of Stories

Back 2388

The story count starting with the first story above grade plane. (Also see
3.3.278.1, First Story Above Grade Plane.)

Front 2389

Nurses’ Stations

Back 2389

Areas intended to provide a center of nursing activity for a group of nurses serving bed patients, where the patient calls are received, nurses are dispatched, nurses’ notes written, inpatient charts prepared, and medications prepared for distribution to patients. Where such activities are carried on in more than one location within a nursing unit, all such separate areas are considered a part of the nurses’ station.

Front 2390

Nursing Home

Back 2390

A building or portion of a building used on a 24-hour basis for the housing and nursing care of four or more persons who, because of mental or physical incapacity, might be unable to provide for their own needs and safety without the assistance of another person.

Front 2391

Nursing Home

Back 2391

A building or portion of a building used on a 24-hour basis for the housing and nursing care of four or more persons who, because of mental or physical incapacity, might be unable to provide for their own needs and safety without the assistance of another person. [5000,
2009]

Front 2392

Nursing Home

Back 2392

A building or portion of a building used on a 24-hour basis for the housing and nursing care of four or more persons who, because of mental or physical incapacity, might be unable to provide for their own needs and safety without the assistance of another person.
[99, 2005]

Front 2393

Nursing Home

Back 2393

A building or portion of a building used on a 24-hour basis for the housing and nursing care of four or more persons who, because of mental or physical incapacity, might be unable to provide for their own needs and safety without the assistance of another person. [99:3.3.129]

Front 2394

Nursing Home

Back 2394

A building or portion of a building used on a 24-hour basis for the housing and nursing care of four or more persons who, because of mental or physical incapacity, might be unable to provide for their own needs and safety without the assistance of another person. (ADM)

Front 2395

NWCG

Back 2395

National Wildfire Coordinating Group.

Front 2396

Objective

Back 2396

A goal that is achieved through the attainment of a skill, knowledge, or both, and that can be observed or measured.
[472, 2002]

Front 2397

Objective

Back 2397

A goal that is achieved through the attainment of a skill, knowledge, or both, that can be observed or measured.

Front 2398

Objective

Back 2398

A goal that is achieved through the attainment of a skill, knowledge, or both, that can be observed or measured. [472, 2002]

Front 2399

Objective

Back 2399

A requirement that needs to be met to achieve a goal.

Front 2400

Obstacle

Back 2400

A part preventing unintentional direct contact, but not preventing direct contact by deliberate action.

Front 2401

Obstructed Construction

Back 2401

Panel construction and other construction where beams, trusses, or other members impede heat flow or water distribution in a manner that materially affects the ability of sprinklers to control or suppress a fire.

Front 2402

Obvious Ignition

Back 2402

Pronounced, continuous, and self-sustaining combustion of the test system.

Front 2403

Occupancy

Back 2403

The purpose for which a building or other structure, or part thereof, is used or intended to be used. [5000, 2003]

Front 2404

Occupancy

Back 2404

The purpose for which a building or other structure, or part thereof, is used or intended to be used. [5000, 2006]

Front 2405

Occupancy

Back 2405

The purpose for which a building or other structure, or part thereof, is used or intended to be used. [ASCE/SEI 7:1.2]

Front 2406

Occupancy

Back 2406

The purpose for which a building or portion thereof is used or intended to be used.

Front 2407

Occupancy

Back 2407

The purpose for which a building or portion thereof is used or intended to be used. [101, 2006]

Front 2408

Occupancy Classification

Back 2408

The system of defining the predominant operating characteristic of a portion of a building or plant for purposes of applying relevant sections of this code.

Front 2409

Occupancy Hazard
Classification Number

Back 2409

A series of numbers from 3 through 7 that are mathematical factors used in a formula to determine total water supply requirements.

Front 2410

Occupancy Importance
Factor (I)

Back 2410

A factor assigned to each structure according to its occupancy category as prescribed in Table 35.3.1 and ASCE/SEI 7, Table 1-1.

Front 2411

Occupant Characteristics

Back 2411

The abilities or behaviors of people before and during a fire.

Front 2412

Occupant Characteristics

Back 2412

The abilities or behaviors of people before and during a fire. [101, 2003]

Front 2413

Occupant Characteristics

Back 2413

The abilities or behaviors of people before and during a fire. [101, 2009]

Front 2414

Occupant Load

Back 2414

The total number of persons that might occupy a building or portion thereof at any one time.

Front 2415

Occupant Load

Back 2415

The total number of persons that might occupy a building or portion thereof at any one time. [5000, 2003]

Front 2416

Occupant Load

Back 2416

The total number of persons that might occupy a building or portion thereof at any one time. [5000, 2009]

Front 2417

Occupant Load (Accessibility)

Back 2417

The number of persons for which the means of egress of a building or portion of a building is designed.

Front 2418

Occupant Use Hose

Back 2418

Fire hose designed to be used by the building’s occupants to fight incipient fires prior to the arrival of trained fire fighters or fire brigade members.

Front 2419

Occupant Use Hose

Back 2419

Fire hose designed to be used by the building’s occupants to fight incipient fires prior to the arrival of trained fire fighters or fire brigade members. [1961, 2007]

Front 2420

Occupational Exposure

Back 2420

An exposure incident that resulted from performance of a member’s duties.

Front 2421

Occupational Illness

Back 2421

An illness or disease contracted through or aggravated by the performance of the duties, responsibilities, and functions of a fire department member.

Front 2422

Occupational Illness

Back 2422

An illness or disease contracted through or aggravated by the performance of the duties, responsibilities, and functions of a fire department member. [1500, 2007]

Front 2423

Occupational Injury

Back 2423

An injury sustained during the performance of the duties, responsibilities, and functions of a fire department member.

Front 2424

Occupational Injury

Back 2424

An injury sustained during the performance of the duties, responsibilities, and functions of a fire department member. [1500, 2007]

Front 2425

Occupational Safety and
Health Program

Back 2425

An occupation specific program, implemented to reduce the risks associated with the occupation, that outlines the components of a program and the roles and responsibilities of the fire department and its members.

Front 2426

Occupiable (Accessibility)

Back 2426

A room or enclosed space designed for human occupancy.

Front 2427

Occupiable Area

Back 2427

An area of a facility occupied by people on a regular basis.

Front 2428

Occupiable Enclosure or
Space

Back 2428

An enclosure or space that has dimensions and physical characteristics such that it could be entered by a person.

Front 2429

Occupiable Story

Back 2429

A story occupied by people on a regular basis.

Front 2430

Occupiable Story

Back 2430

A story occupied by people on a regular basis. [101, 2009]

Front 2431

Occupied

Back 2431

An area with persons present.

Front 2432

Ocean-Going Towing Vessel

Back 2432

A towing vessel intended to operate at a distance greater than 20 miles offshore.

Front 2433

Octave

Back 2433

The bandwidth of a filter that comprises a frequency range of a factor of 2. (That is, f2 = 2f1 as defined in IEC 61260. For example, for an octave-band centered on 500 Hz, the lower frequency is 353 Hz, and the upper frequency is 707 Hz). (SIG-NAS)

Front 2434

Offensive Fire Fighting

Back 2434

The mode of manual fire control in which manual fire suppression activities are concentrated on reducing the size of a fire to accomplish extinguishment.

Front 2435

Offensive Fire Fighting

Back 2435

The mode of manual fire control in which manual fire suppression activities are concentrated on reducing the size of a fire to accomplish extinguishment. [600, 2005]

Front 2436

Offensive Operations

Back 2436

Actions generally performed in the interior of involved structures that involve a direct attack on a fire to directly control and extinguish the fire.

Front 2437

Off-Hook

Back 2437

To make connection with the public-switched telephone network in preparation for dialing a telephone number. (SIG-SSS)

Front 2438

Officer

Back 2438

The command staff positions of safety, liaison, and public information.

Front 2439

Off-Pavement Performance

Back 2439

A vehicle’s ability to perform or operate on other than paved surfaces.

Front 2440

Off-Road Use

Back 2440

Use of fire department vehicles in areas where there is a need to traverse steep terrain or to cross natural hazards on or protruding from the ground.

Front 2441

Off-Road Use Vehicle

Back 2441

A vehicle designed to be used on other than paved or improved roads, especially in areas where no roads, poor roads, and steep grades exist and where natural hazards, such as rocks, stumps, and logs, protrude from the ground.

Front 2442

Offset (Sewer Lines)

Back 2442

A combination of elbows or bends in a line of piping that brings one section of the pipe out of line but into a line parallel with the other section.

Front 2443

Offshore Landing Heliport

Back 2443

A heliport located on fixed or mobile structures and vessels in a marine environment that do not have means of entry and egress connected directly to shore.

Front 2444

Off-Track Emergency
Response

Back 2444

Response to emergencies at a motorsports facility in areas other than the competition area and immediately adjacent areas including, but not limited to, hospitality areas, concession stands, cooking facilities, grandstands, parking areas, and media areas.

Front 2445

Ohm

Back 2445

The SI unit of electrical impedance or, in the direct current case, electrical resistance.

Front 2446

Ohms per Square

Back 2446

The term used to define electrical surface resistivity of a material.

Front 2447

Oil Burner

Back 2447

A device for burning oil in heating appliances such as boilers, furnaces, water heaters, and ranges.

Front 2448

Oil Burner Auxiliary Tank

Back 2448

A tank having a capacity of not more than 60 gal (227 L) that is listed for installation in the supply piping between a burner and its main fuel supply tank. (See 3.3.56.3, Oil Burner Integral Tank.)

Front 2449

Oil Burner Gravity Tank

Back 2449

A supply tank from which the oil is delivered directly to the burner by gravity.

Front 2450

Oil Burner Integral Tank

Back 2450

A tank that is furnished by the manufacturer as an integral part of an oil-burning appliance. (See 3.3.56.1, Oil Burner Auxiliary Tank.)

Front 2451

Oil Burner Storage Tank

Back 2451

A separate tank that is not connected directly to the oil-burning appliance.

Front 2452

Oil Burner Supply Tank

Back 2452

A separate tank connected either directly or by means of a pump to the oil-burning appliance.

Front 2453

Oil-Burning Appliance
(Oil-Burning Unit)

Back 2453

An appliance equipped with one or more oil burners and all the necessary safety controls, electrical equipment, and related equipment manufactured for assembly as a complete unit.

Front 2454

Oil-Burning Equipment

Back 2454

An oil burner of any type, together with its tank, piping, wiring, controls, and related devices, including all oil burners, oil-fired appliances, and heating and cooking appliances, but excluding those exempted by 1.1.5.

Front 2455

Oil-Burning Stove

Back 2455

A self-contained, freestanding, above-the-floor, indirect-fired appliance equipped with one or more oil burners.

Front 2456

Oil Control Valve

Back 2456

An automatically or manually operated device consisting essentially of an oil valve for controlling the fuel supply to a burner.

Front 2457

Oil-Gas-Fired Appliance

Back 2457

An appliance that is capable of burning fuel oils and fuel gases as a main fuel source in an alternate manner.

Front 2458

Oil Immersion

Back 2458

Electrical equipment immersed in a protective liquid in such a way that an explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.

Front 2459

Oil Immersion “o”

Back 2459

Type of protection where electrical equipment is immersed in a protective liquid in such a way that an explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.

Front 2460

Oil Separator

Back 2460

An oil reservoir with baffles used to minimize the discharge of oil mist from the exhaust of a rotary mechanical vacuum pump.

Front 2461

Old-Style/Conventional
Sprinkler

Back 2461

A sprinkler that directs from 40 percent to 60 percent of the total water initially in a downward direction and that is designed to be installed with the deflector either upright or pendent.

Front 2462

Old-Style/Conventional
Sprinkler

Back 2462

A sprinkler that directs from 40 percent to 60 percent of the total water initially in a downward direction and that is designed to be installed with the deflector either upright or pendent. [13, 2007]

Front 2463

One- and Two-Family Dwelling

Back 2463

One- and two-family dwellings include buildings containing not more than two dwelling units in which each dwelling unit is occupied by members of a single family with not more than three outsiders, if any, accommodated in rented rooms.

Front 2464

One- and Two-Family Dwelling
Unit

Back 2464

A building that contains not more than two dwelling units with independent cooking and bathroom facilities.

Front 2465

One- and Two-Family Dwelling
Unit

Back 2465

A building that contains not more than two dwelling units with independent cooking and bathroom facilities. [5000, 2009]

Front 2466

One-Call Utility Location
Service

Back 2466

A service from which contractors, emergency service personnel, and others can obtain information on the location of underground utilities in any area.

Front 2467

One-Call Utility Location
Service

Back 2467

A service from which contractors, emergency service personnel, and others can obtain information on the location of underground utilities in any area. [1670, 2004]

Front 2468

One-Family Dwelling

Back 2468

A building that consists solely of one dwelling unit.

Front 2469

One-Family Dwelling Unit

Back 2469

A building that consists solely of one dwelling unit with independent cooking and bathroom facilities.

Front 2470

One-Third Octave

Back 2470

The bandwidth of a filter that comprises a frequency range of a factor of
21/3. (That is, f = 21/3 f as defined in IEC 61260.) The octave filter can
2 1
be subdivided into three 1⁄3 octave-bands. (SIG-NAS)

Front 2471

On-Hook

Back 2471

To disconnect from the public-switched telephone network. (SIG-SSS)

Front 2472

On-Side Tire Storage

Back 2472

Tires stored horizontally or flat.

Front 2473

On-Side Tire Storage

Back 2473

Tires stored horizontally or flat. [13, 2007]

Front 2474

On-Site Power Production
Facility

Back 2474

The normal supply of electric power for the site that is expected to be constantly producing power.

Front 2475

On-Site Power Production
Facility

Back 2475

The normal supply of electric power for the site that is expected to be constantly producing power.

Front 2476

On-Site Standby Generator

Back 2476

A facility producing electric power on site as the alternate supply of electrical power. It differs from an on-site power production facility in that it is not constantly producing power.

Front 2477

On-Site Standby Generator

Back 2477

A facility producing electric power on site as the alternate supply of electric power. It differs from an on-site power production facility, in that it is not constantly producing power.

Front 2478

On-Site Treatment System

Back 2478

A self-contained system, including pumping equipment, that provides both treatment and disposal of wastewater on or immediately adjacent to a single residence or group of residences or small commercial establishments.

Front 2479

On-Tread Tire Storage

Back 2479

Tires stored vertically or on their treads.

Front 2480

On-Tread Tire Storage

Back 2480

Tires stored vertically or on their treads. [13, 2007]

Front 2481

Open-Air Mercantile
Operation

Back 2481

An operation conducted outside of all structures, with the operations area devoid of all walls and roofs except for small, individual, weather canopies.

Front 2482

Open Area Detection
(Protection)

Back 2482

Protection of an area such as a room or space with detectors to provide early warning of fire. (SIG-IDS)

Front 2483

Open Array

Back 2483

A storage arrangement where air movement through the pile is enhanced because of vertical flues larger than 6 in. (152 mm).

Front 2484

Open Array (Paper)

Back 2484

A vertical storage arrangement in which the distance between columns in both directions is lengthy (all vertical arrays other than closed or standard).

Front 2485

Open Back Strike

Back 2485

A strike applied to the inactive leaf of a pair of doors and cut away at the back to allow either leaf to open or close independently.

Front 2486

Open-Circuit SCBA

Back 2486

An SCBA in which exhalation is vented to the atmosphere and not rebreathed.

Front 2487

Open-Circuit SCBA

Back 2487

An SCBA in which exhalation is vented to the atmosphere and not rebreathed. There are two types of open-circuit SCBA: negative pressure or demand type and positive pressure or demand type.

Front 2488

Open Combustible
Construction

Back 2488

Combustible building construction, including wall, structural framing, roof, roof ceiling, floor, and floor-ceiling assemblies, adjacent to a grease duct on three or fewer sides where one or more sides are protected.

Front 2489

Open Flow Path

Back 2489

A continuous path for movement of an airstream from the forced draft fan inlet to the stack; in an HRSG or other combustion turbine exhaust system, a continuous path for movement of an airstream through the HRSG system or other combustion turbine exhaust systems.

Front 2490

Opening

Back 2490

A through-hole in the fire door assembly that can be seen from the unexposed side while looking through the plane of the assembly from a perpendicular position.

Front 2491

Opening

Back 2491

For the purpose of this standard, a through-hole in the fire window assembly that can be seen from the unexposed side while looking through the plane of the assembly from a perpendicular position.

Front 2492

Openings

Back 2492

Apertures or holes in the building envelope that allow air to flow through the building envelope and which are designed as “open” during design winds as defined by ASCE/SEI 7. [ASCE/SEI 7:6.2]

Front 2493

Open Liquid or Salt Media
Quench-Type Tank

Back 2493

A quench-type tank in which work from the furnace is exposed to air before and upon entering the tank containing a combustible, noncombustible, or salt quench medium.

Front 2494

Open Motor

Back 2494

A motor having ventilating openings that permit passage of external cooling air over and around the windings of the motor. Where
applied to large apparatus without qualification, the term designates a motor having no restriction to ventilation other than that necessitated by mechanical construction.

Front 2495

Open Parking Structure

Back 2495

A parking structure that, at each parking level, has wall openings open to the atmosphere, for an area of not less than 1.4 ft2 for each linear foot (0.4 m2 for each linear meter) of its exterior perimeter. Such openings are distributed over 40 percent of the building perimeter or uniformly over two opposing sides. Interior wall lines and column
lines are at least 20 percent open, with openings distributed to provide ventilation.

Front 2496

Open Parking Structure

Back 2496

A parking structure that, at each parking level, has wall openings open to the atmosphere, for an area of not less than 1.4 ft2 for each linear foot (0.4 m2 for each linear meter) of its exterior perimeter. Such openings are distributed over at least 40 percent of the building perimeter or uniformly over two opposing sides. Interior wall lines
and column lines are at least 20 percent open, with openings distributed to provide ventilation.

Front 2497

Open Parking Structure

Back 2497

A parking structure that meets the requirements of 4.7.1.

Front 2498

Open Parking Structure

Back 2498

A parking structure that meets the requirements of 4.7.1 of
NFPA 88A, Standard for Parking Structures. [88A, 2007]

Front 2499

Open Plan Building

Back 2499

A building having rooms, spaces and corridors delineated by tables, chairs, desks, bookcases, counters, low-height partitions, floor patterns, or any similar finishes or furnishings.