Glossary Of Terms 5

Front 1

Special Operations

Back 1

Those emergency incidents to which the emergency services organization responds that require specific and advanced training and specialized tools and equipment.

Front 2

Special Operations

Back 2

Those emergency incidents to which the fire department responds that require specific and advanced training and specialized tools and equipment.

Front 3

Special Operations

Back 3

Those emergency incidents to which the fire department responds that require specific and advanced training and specialized tools and equipment. [1500, 2007]

Front 4

Special Operations

Back 4

Those emergency incidents to which the fire department responds that require specific and advanced training and specialized tools and equipment. [1500:3.3]

Front 5

Special Operations

Back 5

Those emergency incidents to which the fire department responds that require specific and advanced training and specialized tools and equipment. [1521:3.3]

Front 6

Special Operations

Back 6

Those emergency incidents to which the responding agency responds that require specific and advanced technical training and specialized tools and equipment.

Front 7

Special Permission

Back 7

The written consent of the authority having jurisdiction.

Front 8

Special Permission

Back 8

The written consent of the authority having jurisdiction. [70:100]

Front 9

Special Permission

Back 9

The written consent of the authority having jurisdiction. [70, 2008]

Front 10

Special Protection

Back 10

A means of limiting the temperature of an LP-Gas container for purposes of minimizing the possibility of failure of the container as the result of fire exposure.

Front 11

Special Protection

Back 11

A means of limiting the temperature of an LP-Gas container for purposes of minimizing the possibility of failure of the container as the result of fire exposure. [58, 2008]

Front 12

Special Purpose Fire-Fighting
Vessel

Back 12

Any vessel built for another purpose but provided with fixed fire-fighting capabilities.

Front 13

Special-Purpose Industrial
Occupancy

Back 13

An industrial occupancy in which ordinary and low hazard industrial operations are conducted in buildings designed for, and suitable only for, particular types of operations, characterized by a relatively low density of employee population, with much of the area occupied by machinery or equipment.

Front 14

Special Purpose Residential
Fire Extinguisher

Back 14

A fire extinguisher designed, tested, and listed for a particular type of hazard as specified on its label (see Annex F).

Front 15

Special Service Conditions

Back 15

The following sprinklers are defined according to special application or environment.

Front 16

Special Services Fire
Apparatus

Back 16

A multipurpose vehicle that primarily provides support services at emergency scenes.

Front 17

Special Services Fire
Apparatus

Back 17

A multipurpose vehicle that primarily provides support services at emergency scenes. [1901, 2003]

Front 18

Special Sprinkler

Back 18

A sprinkler that has been tested and listed as prescribed in 8.4.8.

Front 19

Special Sprinkler

Back 19

A sprinkler that has been tested and listed as prescribed in 8.4.8 of
NFPA 13. [13, 2007]

Front 20

Special-Type Gas Vent

Back 20

Gas vents for venting listed Category II, III, and IV appliances.

Front 21

Special Use

Back 21

A use that includes, but is not limited to, events or occurrences during which life safety-threatening situations or fire hazards exist or are
likely to exist as determined by the AHJ.

Front 22

Specific Application Control Mode Sprinkler (for Storage Use)

Back 22

A type of spray sprinkler listed at a minimum operating pressure with a specific number of operating sprinklers for a given protection scheme.

Front 23

Specific Extinction Area

Back 23

A measure of smoke obscuration potential per unit mass burnt, determined as the product of the specific extinction coefficient and the volumetric mass flow rate, divided by the mass loss rate, m/kg (ft/lb).

Front 24

Specific Gravity

Back 24

As applied to gas, the ratio of the weight of a given volume to that of the same volume of air, both measured under the same conditions.

Front 25

Specific Gravity (air) (vapor density)

Back 25

The ratio of the average molecular weight of a given volume of gas or vapor to the average molecular weight of an equal volume of air at the same temperature and pressure.

Front 26

Specific Gravity (of a liquid or solid)

Back 26

The ratio of the average molecular weight of a given volume of liquid or solid to the average molecular weight of an equal volume of water at the same temperature and pressure.

Front 27

Specific Optical Density (Ds)

Back 27

The optical density, as measured in ASTM E 662, over unit path length within a chamber of unit volume, produced from a specimen
of unit surface area, that is irradiated by a heat flux of 2.5 W/cm2 for a specified period of time.

Front 28

Specific Particle Density

Back 28

The density of individual dust particles, as opposed to the bulk density of the material.

Front 29

Specific Property Use

Back 29

The purpose for which a specific space, structure, or portion of a structure is used by the owner, tenant, or occupant of the space.

Front 30

Specified Service Life

Back 30

Time, exposure event, or number of uses to which a compliant product or component is expected to remain functional.

Front 31

Specimen

Back 31

Individual pieces of a sample used in a single test assembly.

Front 32

Specimen

Back 32

The conditioned element, item, component, or composite that is subjected to testing. Specimens are taken from samples. In some tests, the specimen and sample can also be the same element, item, component, or composite.

Front 33

Specimen

Back 33

The conditioned element, item, component or composite that is tested. Specimens are taken from samples. (See also 3.3.62, Sample.)

Front 34

Specimen

Back 34

The conditioned element, item, component, or composite that is tested. Specimens are taken from samples. (See also 3.3.71, Sample.)

Front 35

Specimen

Back 35

The conditioned element, item, component, or composite that is tested; specimens are taken from samples. (See also 3.3.97, Sample.)

Front 36

Specimen

Back 36

The conditioned element, item, component, or composite that is tested. Specimens are taken from samples (see also Sample).

Front 37

Specimen

Back 37

The conditioned ensemble, element, item, or component that is tested. Specimens are taken from samples.

Front 38

Specimen

Back 38

The conditioned ensemble, element, item, or component that is tested. Specimens are taken from samples. (See also 3.3.110, Sample.)

Front 39

Specimen

Back 39

The conditioned ensemble, element, item, or component that is tested. Specimens are taken from samples. (See also 3.3.18, Sample.)

Front 40

Specimen

Back 40

The item that undergoes testing; in some cases, the specimen is also the sample. [1971, 2007]

Front 41

Spectacles

Back 41

A protective device intended to shield the wearer’s eyes from certain hazards depending on the spectacle type.

Front 42

Spectator

Back 42

A nonparticipant whose primary purpose is to view a rocket launch.

Front 43

Spectator Area

Back 43

An area designated by the range safety officer where spectators view a high power rocket launch.

Front 44

Spent Bed Material

Back 44

In a fluidized bed boiler, material removed from the bed generally comprised of reacted sorbent, calcined limestone, ash, and solid, unburned combustibles. For some applications, the spent bed material might also contain some inert material, such as sand.

Front 45

Spent Material

Back 45

Material from which the oil or fat has been extracted but which has not been desolventized.

Front 46

Spider (Cable Splicing Block)

Back 46

A device that contains busbars that are insulated from each other for the purpose of splicing or distributing power to portable cables and cords that are terminated with single-pole busbar connectors.

Front 47

Spill Prevention Control and Countermeasure (SPCC) Plan

Back 47

A plan prepared for facilities with a chemical or chemicals that exceed certain capacities in accordance with governmental regulations.

Front 48

Spiral Reinforcement

Back 48

A hose reinforcement consisting of pairs of layers of yarn spiraled with no interlacing between the individual layers. The layers of yarn in
each pair are spirally wound in opposite directions. A layer of rubber separates each pair of spiraled layers.

Front 49

Splash-Resistant Eyewear

Back 49

Safety glasses, prescription eyewear with protective side shields, goggles, or chin-length face shields that, when worn properly, provide limited protection against splashes, spray, spatters, or droplets of body fluids.

Front 50

Splash-Resistant Eyewear

Back 50

Safety glasses, prescription eyewear with protective side shields, goggles, or chin-length face shields that, when worn properly, provide limited protection against splashes, spray, spatters, or droplets of body fluids. [1999, 2003] (See also 3.3.15.)

Front 51

Split Astragal

Back 51

A horizontal or vertical molding attached to both leaves of a pair of doors.

Front 52

Split Shaft PTO

Back 52

A power takeoff (PTO) drive system that is inserted between the chassis transmission and the chassis drive axle and that has the shift mechanism necessary to direct the chassis engine power either to the drive axle or to a fire pump or other accessory.

Front 53

Split Shaft PTO

Back 53

A power takeoff (PTO) drive system that is inserted between the chassis transmission and the chassis drive axle and that has the shift mechanism necessary to direct the chassis engine power either to the drive axle or to a fire pump or other accessory. [1901, 2003]

Front 54

Split Wood Irregularity

Back 54

A separation of the wood parallel to the fiber direction due to tearing of the wood fibers.

Front 55

Spoil Pile (Spoil)

Back 55

A pile of excavated soil next to the excavation or trench.

Front 56

Spoliation

Back 56

Loss, destruction, or material alteration of an object or document that is evidence or potential evidence in a legal proceeding by one who has the responsibility for its preservation.

Front 57

Sponge

Back 57

Metal after it has been won from the ore but before it is melted.

Front 58

Sponsor

Back 58

The organization (person, group, or government agency) that arranges with a duly authorized fireworks supplier for its services in presenting a fireworks display or in providing fireworks for use in a display.

Front 59

Spontaneous Heating

Back 59

Process whereby a material increases in temperature without drawing heat from its surroundings.

Front 60

Spontaneous Heating

Back 60

Process whereby a material increases in temperature without drawing heat from its surroundings. [921, 2008]

Front 61

Spontaneous Ignition

Back 61

Initiation of combustion of a material by an internal chemical or biological reaction that has produced sufficient heat to ignite the material.

Front 62

Sports Drink

Back 62

A fluid replacement beverage that is between 4 percent and 8 percent carbohydrate and contains between 0.5 g and 0.7 g of sodium per liter of solution.

Front 63

Spotter

Back 63

A member of the fireworks display crew (either the operator or an assistant) who observes the firing and bursting of aerial shells and other display fireworks for the purpose of detecting proper mortar angling, noting the occurrence of duds, and observing for other potentially hazardous situations.

Front 64

Spotting (Prespotting)

Back 64

The local application of a solvent to spots of dirt, grease, paint, tar, and other stains for removal of same.

Front 65

Spot-Type Detector

Back 65

A device in which the detecting element is concentrated at a particular location. Typical examples are bimetallic detectors, fusible alloy detectors, certain pneumatic rate-of-rise detectors, certain smoke detectors, and thermoelectric detectors. [72, 2007]

Front 66

Spot-Type Detector

Back 66

A device in which the detecting element is concentrated at a particular location. Typical examples are bimetallic detectors, fusible alloy detectors, certain pneumatic rate-of-rise detectors, certain smoke detectors, and thermoelectric detectors. (SIG-IDS)

Front 67

Spray Area

Back 67

Any fully enclosed, partly enclosed, or unenclosed area in which dangerous quantities of flammable or combustible vapors, mists, residues, dusts, or deposits are present due to the operation of spray processes, including (a) any area in the direct path of a spray application process; (b) the interior of a spray booth or spray room or limited finishing workstation, as herein defined; (c) the interior of
any exhaust plenum, eliminator section, or scrubber section; (d) the interior of any exhaust duct or exhaust stack leading from a spray application process; (e) the interior of any air recirculation filter house or enclosure, including secondary recirculation particulate filters; (f) any solvent concentrator (pollution abatement) unit or solvent recovery (distillation) unit. [33, 2007]

Front 68

Spray Area

Back 68

Normally, locations outside of buildings or localized operations within a larger room or space. Such are normally provided with some local vapor extraction/ventilation system. In automated operations, the
area limits shall be the maximum area in the direct path of spray operations. In manual operations, the area limits shall be the maximum area of spray when aimed at 180 degrees to the application surface.

Front 69

Spray Area

Back 69

Any fully enclosed, partly enclosed, or unenclosed area in which dangerous quantities of flammable or combustible vapors, mists, residues, dusts, or deposits are present due to the operation of spray processes, including (a) any area in the direct path of a spray application process; (b) the interior of a spray booth or spray room or limited finishing workstation, as herein defined; (c) the interior of
any exhaust plenum, eliminator section, or scrubber section; (d) the interior of any exhaust duct or exhaust stack leading from a spray application process; (e) the interior of any air recirculation filter house or enclosure, including secondary recirculation particulate filters; (f) any solvent concentrator (pollution abatement) unit or solvent recovery (distillation) unit.

Front 70

Spray Booth

Back 70

An enclosure or insert within a larger room used for spray/coating/dipping applications. A spray booth may be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray booth is provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated air supply.

Front 71

Spray Booth

Back 71

A power-ventilated enclosure for a spray application operation or process that confines and limits the escape of the material being sprayed, including vapors, mists, dusts, and residues that are produced by the spraying operation and conducts or directs these materials to
an exhaust system.

Front 72

Spray Booth

Back 72

A power-ventilated enclosure for a spray application operation or process that confines and limits the escape of the material being sprayed, including vapors, mists, dusts, and residues that are produced by the spraying operation and conducts or directs these materials to
an exhaust system. [33, 2007]

Front 73

Sprayed Fire-Resistive Material

Back 73

A cementitious or fibrous material that is spray-applied to structural elements, walls, floors, and roofs to provide fire-resistive protection.

Front 74

Spray Nozzle

Back 74

An appliance intended for connection to a hose line or monitor to discharge water in either a spray pattern or a straight stream pattern as selected by the operator.

Front 75

Spray Nozzle

Back 75

A nozzle with an adjustable pattern and a control device that shuts off the flow.

Front 76

Spray Room

Back 76

A power-ventilated fully enclosed room used exclusively for open spraying of flammable or combustible materials.

Front 77

Spray Room

Back 77

A power-ventilated fully enclosed room used exclusively for open spraying of flammable or combustible materials. [33, 2007]

Front 78

Spray Room

Back 78

A purposefully enclosed room built for spray/coating/dipping applications provided with dedicated ventilation supply and exhaust. Normally the room is configured to house the item to be painted, providing reasonable access around the item/process. Depending on the size of the item being painted, such rooms may actually be the entire building or the major portion thereof.

Front 79

Spray Sprinkler

Back 79

A type of sprinkler listed for its capability to provide fire control for a wide range of fire hazards.

Front 80

Spray Sprinkler

Back 80

A type of sprinkler listed for its capability to provide fire control for a wide range of fire hazards. [13, 2007]

Front 81

Spreader

Back 81

A powered rescue tool that has at least one movable arm that opens to move material.

Front 82

Spreader Stoker

Back 82

A stoker that distributes fuel into the furnace from a location above the fuel bed with a portion of the fuel burned in suspension and a portion on the grates. Spreader stoker grates include the following:
(1) Stationary Grate — A grate in which fuel is fed onto a fixed position grate; (2) Dump Grate — A grate in which fuel is fed onto a
nonmoving grate that is arranged to allow intermittent discharge of refuse through tilting action of the grate bars; (3) Continuous Discharge or Traveling Grate — A grate that continuously discharges the refuse from the end after burning the fuel.

Front 83

Spreading Force

Back 83

The force to push or pull that is generated by a spreader rescue tool and that is measured or calculated at the very tips of the spreader arms or ram.

Front 84

Sprig

Back 84

A pipe that rises vertically and supplies a single sprinkler.

Front 85

Spring Hinge

Back 85

A closing device in the form of a hinge with a built-in spring used to hang and close the door.

Front 86

Spring Release Device (Rolling
Steel Door)

Back 86

A device that, when activated, releases part of the spring counterbalancing force and causes the door to close.

Front 87

Sprinkler Characteristics, General

Back 87

The following are characteristics of a sprinkler that define its ability to control or extinguish a fire. (a) Thermal sensitivity. A measure of the rapidity with which the thermal element operates as installed in a specific sprinkler or sprinkler assembly. One measure of thermal sensitivity is the response time index (RTI) as measured under standardized test conditions. (1) Sprinklers defined as fast response have a thermal element with an RTI of 50 (meters-seconds)1/2 or less. (2) Sprinklers defined as standard response have a thermal element with an RTI of 80 (meters-seconds)1/2 or more. (b) Temperature rating. (c) Orifice size (see Chapter 6). (d) Installation orientation (see
3.6.3). (e) Water distribution characteristics (i.e., application rate, wall wetting). (f) Special service conditions (see 3.6.4).

Front 88

Sprinkler Controlled Fire

Back 88

A fire that has a constant or decaying heat release rate due to the action of sprinkler spray.

Front 89

Sprinkler System

Back 89

For fire protection purposes, an integrated system of underground and overhead piping designed in accordance with fire protection engineering standards. The installation includes at least one automatic water supply which supplies one or more systems. The portion of the sprinkler system above ground is a network of specially sized or hydraulically designed piping installed in a building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. Each system has a control valve located in the system riser or its supply piping. Each sprinkler system includes a device for actuating an alarm when the system is in operation. The system is usually activated by heat from a fire and discharges water over the fire area. [13, 2007]

Front 90

Sprinkler System

Back 90

For fire protection purposes, an integrated system of underground and overhead piping designed in accordance with fire protection engineering standards. The installation includes at least one automatic water supply which supplies one or more systems. The portion of the sprinkler system above ground is a network of specially sized or hydraulically designed piping installed in a building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. Each system has a control valve located in the system riser or its supply piping. Each sprinkler system includes a device for actuating an alarm when the system is in operation. The system is usually activated by heat from a fire and discharges water over the fire area.

Front 91

Sprinkler System

Back 91

For fire protection purposes, an integrated system of underground and overhead piping designed in accordance with fire protection engineering standards. The installation includes one or more automatic water supplies. The portion of the sprinkler system aboveground is a network of specially sized or hydraulically designed piping installed in a building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. The system is usually activated by heat from a fire and discharges water over the fire area.

Front 92

Sprinkler System

Back 92

For fire protection purposes, an integrated system of underground and overhead piping designed in accordance with fire protection engineering standards. The installation includes one or more automatic water supplies. The portion of the sprinkler system aboveground is a network of specially sized or hydraulically designed piping installed in a building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. The valve controlling each system riser is located in the system riser or its supply piping. Each sprinkler system riser includes a device for actuating an alarm when the system is in operation. The system is usually activated by heat from a fire and discharges water over the fire area.

Front 93

Sprinkler System

Back 93

For fire protection purposes, an integrated system of underground and overhead piping designed in accordance with fire protection engineering standards. The installation includes one or more automatic water supplies. The portion of the sprinkler system above ground is a network of specially sized or hydraulically designed piping installed in a building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. The valve controlling each system riser is located in the system riser or its supply piping. Each sprinkler system riser includes a device for actuating an alarm when the system is in operation. The system is usually activated by heat from a fire and discharges water over the fire area. [13, 2002]

Front 94

Sprinkler Types

Back 94

The following sprinklers are defined according to design and performance characteristics.

Front 95

Spurious Operation

Back 95

An unwanted change in state of equipment due to fire-induced faults (e.g., hot shorts, open circuits, or shorts to ground) on its power or control circuitry.

Front 96

Spurious Signal

Back 96

A fire-induced signal that could cause the spurious operation of components or equipment that would adversely affect the safe shutdown capability.

Front 97

Stability Test (Inclining
Experiment)

Back 97

A test to determine the vessel displacement (light ship survey) and the position of the center of gravity both vertical and longitudinal.

Front 98

Stabilization

Back 98

The medical measures used to restore basic physiologic equilibrium to a patient, to facilitate future definitive care, in order to ensure
survival.

Front 99

Stabilization

Back 99

The point in an incident when the adverse behavior of the hazardous material, or the hazardous component of a weapon of mass destruction (WMD), is controlled.

Front 100

Stabilization Points

Back 100

Key points where stabilization devices can be installed on a vehicle or machine to keep the vehicle or object from moving during rescue operations.

Front 101

Stabilizer

Back 101

A device integral with or separately attached to the chassis of a fire apparatus with an aerial device that is used to increase the moments tending to resist overturning the apparatus.

Front 102

Stabilizer Pad

Back 102

A plate inserted beneath a stabilizer shoe to give greater surface bearing area.

Front 103

Stabilizer Pad

Back 103

A plate inserted beneath a stabilizer shoe to give greater surface bearing area. [1901, 2003]

Front 104

Stabilizer Shoe

Back 104

A permanently mounted shoe on a stabilizer to provide a ground surface area.

Front 105

Stabilizer Shoe

Back 105

A permanently mounted shoe on a stabilizer to provide a ground surface area. [1901, 2003]

Front 106

Stabilizing Devices

Back 106

All components of the anchoring and support systems, such as piers, footings, ties, anchoring equipment, anchors, or any other materials and methods of construction, that support and secure the manufactured home to the ground.

Front 107

Stable Bed

Back 107

In a fluidized bed boiler, a bed of granular material that maintains sustained combustion at a desired temperature.

Front 108

Stable Flame

Back 108

A flame envelope that retains its continuity throughout the maximum rate of change within the operating range of the boiler, burner, or HRSG.

Front 109

Stable Liquid

Back 109

Any liquid not defined as unstable.

Front 110

Stable Liquid

Back 110

Any liquid not defined as unstable. [30, 2003]

Front 111

Stable Liquid

Back 111

Any liquid not defined as unstable. [30, 2008]

Front 112

Stable Materials

Back 112

Those materials that normally have the capacity to resist changes in their chemical composition, despite exposure to air, water, and heat as encountered in fire emergencies.

Front 113

Stack Effect

Back 113

The vertical airflow within buildings caused by the
temperature-created density differences between the building interior
and exterior or between two interior spaces.

Front 114

Stack Effect

Back 114

The vertical airflow within buildings caused by the
temperature-created density differences between the building interior
and exterior or between two interior spaces. [92B, 2009]

Front 115

Staff Aide

Back 115

A fire fighter or fire officer assigned to a supervisory chief officer to assist with the logistical, tactical, and accountability functions of incident, division, or sector command.

Front 116

Staffing

Back 116

The number and level of training of personnel deployed on an emergency call.

Front 117

Staff (Residential Board and
Care)

Back 117

Persons who provide personal care services, supervision, or assistance.

Front 118

Stage

Back 118

A space within a building used for entertainment and utilizing drops or scenery or other stage effects.

Front 119

Stage Effect (Special Effect)

Back 119

An electrical or electromechanical piece of equipment used to simulate a distinctive visual or audible effect such as wind machines, lightning simulators, sunset projectors, and the like.

Front 120

Stage Property

Back 120

An article or object used as a visual element in a motion picture or television production, except painted backgrounds (scenery) and costumes.

Front 121

Stage Set

Back 121

A specific area set up with temporary scenery and properties designed and arranged for a particular scene in a motion picture or television production.

Front 122

Staging

Back 122

A specific function where resources are assembled in an area at or near the incident scene to await instructions or assignments.

Front 123

Staging

Back 123

Temporary storage in a process area of liquids in containers, intermediate bulk containers, and portable tanks.

Front 124

Staging Area

Back 124

A prearranged, strategically placed area, where support response personnel, vehicles, and other equipment can be held in an organized state of readiness for use during an emergency.

Front 125

Staging Area

Back 125

Location established where resources can be placed while they await a tactical assignment.

Front 126

Stair Descent Device

Back 126

A portable device, incorporating a means to control the rate of descent, used to transport a person with a severe mobility impairment downward on stairs during emergency egress.

Front 127

Stairtower

Back 127

A stairway enclosed in a continuous vertical shaft.

Front 128

Stairway

Back 128

A vertical means of egress between decks.

Front 129

Stairway

Back 129

One or more flights of stairs and the landings and platforms connecting them, forming a continuous and uninterrupted passage from one story to another in a building or structure.

Front 130

Stakeholder

Back 130

An individual, or representative of same, having an interest in the successful completion of a project.

Front 131

Stakeholder

Back 131

An individual, or representative of same, having an interest in the successful completion of a project. [101, 2003]

Front 132

Stakeholder

Back 132

An individual, or representative of same, having an interest in the successful completion of a project. [101, 2009]

Front 133

Stakeholder

Back 133

Any individual, group, or organization that might affect, be affected by, or perceive itself to be affected by the emergency.

Front 134

Stakeholder

Back 134

Any individual, group, or organization that might affect, be affected by, or perceive itself to be affected by the risk.

Front 135

Stakeholders

Back 135

Any person, group, or organization affected by and having a vested interest in the incident and/or the response operation.

Front 136

Stall

Back 136

A room or compartment that normally houses one or more animals.

Front 137

Stand-Alone PASS

Back 137

A PASS that is not an integral part of any other item of protective clothing or protective equipment.

Front 138

Stand-Alone System

Back 138

A fuel cell system that supplies power independently of an electrical production and distribution network.

Front 139

Stand-Alone System

Back 139

A solar photovoltaic system that supplies power independently of an electrical production and distribution network.

Front 140

Standard

Back 140

A document, the main text of which contains only mandatory provisions using the word “shall” to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law.

Front 141

Standard

Back 141

A document, the main text of which contains only mandatory provisions using the word “shall” to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law. Nonmandatory provisions shall be located in an annex, footnote, or fine-print note and are not to be considered a part of the requirements of a standard.

Front 142

Standard

Back 142

A document, the main text of which contains only mandatory provisions using the word “shall” to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law. Nonmandatory provisions shall be located in an appendix or annex, footnote, or fine-print note
and are not to be considered a part of the requirements of a standard.

Front 143

Standard Array (Paper)

Back 143

A vertical storage arrangement in which the distance between columns in one direction is short [1 in. (25 mm) or less] and is in excess of 2 in. (50 mm) in the other direction.

Front 144

Standard Balanced Pressure
Proportioner

Back 144

This system utilizes a foam concentrate pump. Foam concentrate is drawn from an atmospheric storage tank, is pressurized by the pump, and passes back through a diaphragm balancing valve to the storage tank. Water- and foam concentrate-sensing lines are directed to the balancing valve and maintain the foam liquid at a pressure equal to that of the water pressure. The two equal pressures are fed to the proportioner proper and are mixed at a predetermined rate.

Front 145

Standard Cubic Feet per
Minute (SCFM)

Back 145

An expression of airflow rate in which the airflow rate is corrected to standard temperature and pressure.

Front 146

Standard Cubic Feet per
Minute (SCFM)

Back 146

An expression of airflow rate in which the airflow rate is corrected to standard temperature and pressure. Standard temperature is 60°F (15°C) and standard pressure is 14.696 psi (101.33 kPa) or 29.92 in. Hg (760 mm Hg).

Front 147

Standard Cubic Foot of Gas

Back 147

Cubic foot of gas at 14.7 psia (101 kPa) and 70°F (21°C).

Front 148

Standard Cubic Foot of Gas

Back 148

Cubic foot of gas at 14.7 psia (101 kPa) and 70°F (21°C). [55, 2005]

Front 149

Standard Cubic Foot (SCF)

Back 149

The volume of gas in cubic feet at the standard atmospheric conditions at 60°F (15.6°C) and 14.7 psia (101 kPa).

Front 150

Standard Deviation

Back 150

A parameter that indicates the way in which a probability function is centered around its mean.

Front 151

Standard Equipment and
Tools

Back 151

Investigator’s tools and equipment that every investigator must carry.

Front 152

Standard Fire Detection (SFD) Systems

Back 152

Systems that use fire detection-initiating devices to achieve certain life safety and property protection in accordance with applicable standards.

Front 153

Standard Operating Guideline

Back 153

An organizational directive that establishes a course of action or policy.

Front 154

Standard Operating Guideline

Back 154

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely, which can be varied due to operational need in the performance of designated operations or actions.

Front 155

Standard Operating Procedure

Back 155

An organizational directive that establishes a standard course of action. [1201:1.7]

Front 156

Standard Operating Procedure

Back 156

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions.

Front 157

Standard Operating Procedure

Back 157

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521, 2002]

Front 158

Standard Operating Procedure

Back 158

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521, 2008]

Front 159

Standard Operating Procedure

Back 159

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521:3.3]

Front 160

Standard Operating
Procedures

Back 160

Written instructions that document and define the manner in which activities should be conducted.

Front 161

Standard Operating Procedure
(SOP)

Back 161

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521, 2002]

Front 162

Standard Operating Procedure
(SOP)

Back 162

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521, 2008]

Front 163

Standard Operating
Procedures (SOPs)

Back 163

A written organizational directive that establishes or prescribes specific operational or administrative methods to be followed routinely for the performance of designated operations or actions. [1521, 2008]

Front 164

Standard Operating
Procedures (SOPs)

Back 164

Written instructions that document and define the manner in which activities should be conducted. [1404, 2002]

Front 165

Standard Operating
Procedures (SOPs)

Back 165

Written organizational directives that establish or prescribe specific operational or administrative methods that are to be followed routinely for the performance of designated operations or actions.

Front 166

Standard Pressure
Proportioner

Back 166

This system uses a pressure vessel containing foam concentrate. Water is supplied to the proportioner, which directs an amount of the supply downward onto the contained concentrate, thereby pressurizing the tank. Pressurized concentrate then is forced through an orifice back into the flowing water stream. This type of system is applicable for use with foam concentrates having a specific gravity substantially higher than water. It is not applicable for use with foam concentrates with a specific gravity at or near that of water.

Front 167

Standard Records Vault

Back 167

A completely fire-resistive enclosure used exclusively for records storage.

Front 168

Standard Roll

Back 168

A roll of film that is 35 mm (13⁄8 in.) wide, 305 m (1000 ft) long, and approximately 2.3 kg (5 lb) in weight.

Front 169

Standard Simulated Concrete
Subfloor

Back 169

Uncoated fiber-reinforced cement board with a nominal thickness of
6.3 mm and a density of 1442 kg/m3 ±160 kg/m3.

Front 170

Standard Spray Sprinkler

Back 170

A spray sprinkler with maximum coverage areas as specified in
Sections 8.6 and 8.7 of NFPA 13. [13, 2007]

Front 171

Standard Spray Sprinkler

Back 171

A spray sprinkler with maximum coverage areas as specified in
Sections 8.6 and 8.7 of this standard.

Front 172

Standard Temperature and
Pressure (STP)

Back 172

A temperature of 70°F (21°C) and a pressure of 1 atmosphere (14.7 psi or 760 mm Hg).

Front 173

Standby Engine Area

Back 173

The area or enclosed room of a telecommunications facility that contains standby engine equipment.

Front 174

Standby Engine Equipment

Back 174

Standby engine equipment that includes, but is not limited to, a reciprocating engine or turbine, a generator, starter batteries, and associated cabling and that provides standby power to the
signal-processing equipment and potentially the entire telecommunications facility if the electrical utility’s power is interrupted.

Front 175

Standby Mode

Back 175

A mode wherein all flow of flammable gas or liquid ceases and heaters have power removed.

Front 176

Standby Person

Back 176

A person who is assigned to remain on the outside of the confined space and to be in communication with those working inside.

Front 177

Standing Orders

Back 177

A direction or instruction for delivering patient care without on-line medical oversight backed by authority of the system medical director.

Front 178

Stand Lamp (Work Light)

Back 178

A portable stand that contains a general-purpose luminaire or lampholder with guard for the purpose of providing general illumination in the studio or stage.

Front 179

Stand Lamp (Work Light)

Back 179

A portable stand that contains a general-purpose luminaire or lampholder with guard for the purpose of providing general illumination on the stage or in the auditorium.

Front 180

Standpipe

Back 180

A pipe and attached hose valves and hose (if provided) used for conveying water to various parts of a building for fire-fighting purposes.

Front 181

Standpipe

Back 181

The vertical portion of the system piping that delivers the water supply for hose connections, and sprinklers on combined systems, vertically from floor to floor. The term standpipe can also refer to the horizontal portion of the system piping that delivers the water supply for two or more hose connections, and sprinklers on combined systems, on a single level.

Front 182

Standpipe

Back 182

The vertical portion of the system piping that delivers the water supply for hose connections, and sprinklers on combined systems, vertically from floor to floor. The term standpipe can also refer to the horizontal portion of the system piping that delivers the water supply for two or more hose connections, and sprinklers on combined systems, on a single level. [14, 2003]

Front 183

Standpipe System

Back 183

An arrangement of piping, valves, hose connections, and allied equipment installed in a building or structure such that, when supplied with adequate water, allows attached hose lines to be used to extinguish a fire.

Front 184

Standpipe System

Back 184

An arrangement of piping, valves, hose connections, and allied equipment installed in a building or structure, with the hose connections located in such a manner that water can be discharged in streams or spray patterns through attached hose and nozzles, for the purpose of extinguishing a fire, thereby protecting a building or structure and its contents in addition to protecting the occupants.

Front 185

Standpipe System

Back 185

An arrangement of piping, valves, hose connections, and allied equipment installed in a building or structure, with the hose connections located in such a manner that water can be discharged in streams or spray patterns through attached hose and nozzles, for the purpose of extinguishing a fire, thereby protecting a building or structure and its contents in addition to protecting the occupants.
[14, 2007]

Front 186

Standpipe System

Back 186

An arrangement of piping, valves, hose connections, and allied equipment with the hose connections located in such a manner that water can be discharged in streams or spray patterns through attached hose and nozzles, for the purpose of extinguishing a fire and so protecting designated buildings, structures, or property in addition to providing occupant protection as required.

Front 187

Standpipe System and Mobile
Supply

Back 187

A system consisting of a mobile supply of carbon dioxide, designed to be quickly moved into position and connected to a system of fixed piping, supplying fixed nozzles or hose lines or both that are designed for either total flooding or local application.

Front 188

Standpipe System Zone

Back 188

A vertical subdivision of a standpipe system limited or determined by the pressure limitations of the system components.

Front 189

Starboard Side

Back 189

The right-hand side of a ship as one faces forward.

Front 190

Starboard Side

Back 190

The right-hand side of a ship as one faces forward. [1405, 2006]

Front 191

Stars

Back 191

Small masses of pyrotechnic compounds that are projected from aerial shells, mines, or roman candles.

Front 192

Start of Construction (Flood
Resistance)

Back 192

For all matters related to flood-resistant design and construction, the date of permit issuance for new construction or substantial improvements to an existing structure, provided the actual start of construction, repair, reconstruction, rehabilitation, addition placement, or other improvement is within 180 days after the date of issuance.

Front 193

Start-Up Combustion Control
System

Back 193

A control system used to regulate and maintain proper air-fuel ratio during the start-up period where the customary indexes, such as pressure, temperature, load, or flow, that motivate the normal automatic combustion control system are not available or suitable.

Front 194

Static Activation Pressure
(Pstat)

Back 194

Pressure that activates a vent closure when the pressure is increased slowly (with a rate of pressure rise less than 0.1 bar/min = 1.5 psi/min).

Front 195

Static Electric Discharge

Back 195

A release of static electricity in the form of a spark, corona discharge, brush discharge, or propagating brush discharge that might be capable of causing ignition under appropriate circumstances.

Front 196

Static Electric Discharge

Back 196

A release of static electricity in the form of a spark, corona discharge, brush discharge, or propagating brush discharge that might be capable of causing ignition under appropriate circumstances. [77,
2000]

Front 197

Static Electric Discharge

Back 197

A release of static electricity in the form of a spark, corona discharge, brush discharge, or propagating brush discharge that might be capable of causing ignition under appropriate circumstances. [77,
2003]

Front 198

Static Electricity

Back 198

An electric charge that is significant only for the effects of its electric field component and that manifests no significant magnetic field component.

Front 199

Static Electricity

Back 199

For purposes of tank entry, cleaning, or repair, the electrification of materials through physical contact and separation and the various effects that result from the positive and negative charges so formed.

Front 200

Static Electricity

Back 200

For the purpose of handling releases of flammable and combustible liquids and gases, the electrification of materials through physical contact and separation and the various effects that result from the positive and negative charges so formed.

Front 201

Static Electricity

Back 201

The acquisition and retention of electrical charge through induction (by means of corona discharge) or by triboelectric means (rubbing with another material).

Front 202

Static Liquid Level

Back 202

The level, with respect to the pump, of the body of liquid from which it takes suction when the pump is not in operation. For vertical shaft turbine-type pumps, the distance to the liquid level is measured vertically from the horizontal centerline of the discharge head or tee.

Front 203

Static-Phase Converter

Back 203

A device without rotating parts, sized for a given 3-phase load to permit operation from a single-phase supply.

Front 204

Static Pressure

Back 204

For standpipe systems, pressure acting on a point in the system with no flow from the system.

Front 205

Static Pressure

Back 205

The pressure that exists at a given point under normal distribution system conditions measured at the residual hydrant with no hydrants flowing.

Front 206

Static Pressure

Back 206

The pressure that exists at a given point under normal distribution system conditions measured at the residual hydrant with no hydrants flowing. [24, 2007]

Front 207

Static System

Back 207

An HVAC system designed to stop the movement of air within the system at the indication of a fire.

Front 208

Station

Back 208

A place designated for the purpose of loading and unloading passengers, including patron service areas and ancillary spaces associated with the same structure.

Front 209

Stationary

Back 209

Permanently connected and fixed in place.

Front 210

Stationary Industrial Furnace

Back 210

A low-, medium-, or high-heat appliance classified in accordance with its character and size and the temperatures developed in the portions thereof where substances or materials are heated for baking, drying, roasting, melting, vaporizing, or other purposes.

Front 211

Stationary Installation
(Permanent Installation)

Back 211

An installation of LP-Gas containers, piping, and equipment for indefinite use at a particular location; an installation not normally expected to change in status, condition, or location.

Front 212

Stationary Object

Back 212

Any object, device, or appliance that is not fastened but that is not readily moved from one place to another in normal use, for example, a refrigerator.

Front 213

Stationary Tank

Back 213

A packaging designed primarily for stationary installations not intended for loading, unloading, or attachment to a transport vehicle as part of its normal operation in the process of use.

Front 214

Stationary Tank

Back 214

A packaging designed primarily for stationary installations not intended for loading, unloading, or attachment to a transport vehicle as part of its normal operation in the process of use.
[55, 2005]

Front 215

Station Inlet

Back 215

An inlet point in a piped medical/surgical vacuum distribution system at which the user makes connections and disconnections. (PIP)

Front 216

Station Outlet

Back 216

An outlet point in a piped medical gas distribution system at which the user makes connections and disconnections. (PIP)

Front 217

Station Outlet

Back 217

Point at which gas is withdrawn from the permanent piping or portable outlet headers.

Front 218

Station Platform

Back 218

The area of a station immediately adjacent to a guideway, used primarily for loading and unloading passengers.

Front 219

Station/Work Uniform
Garment

Back 219

Textile apparel that cover the torso and limbs or parts of limbs, excluding heads, hands, and feet.

Front 220

Station/Work Uniforms

Back 220

Nonprimary protective garments certified as compliant with this standard that are intended to be worn by fire and emergency services personnel while on duty.

Front 221

Stay Chain

Back 221

A chain used to support the fire safety curtain.

Front 222

Staypoles (Tormentors)

Back 222

Poles attached to each beam of the base section of extension ladders and used to assist in raising the ladder and to help provide stability of the raised ladder.

Front 223

Staypoles (Tormentors)

Back 223

Poles attached to each beam of the base section of extension ladders and used to assist in raising the ladder and to help provide stability of the raised ladder. [1931:3.3]

Front 224

Stay Rollers (Sliding Door, Horizontal)

Back 224

A device used on horizontally sliding doors at their back lower corners to guide the door and prevent the door from moving away from the wall under fire conditions.

Front 225

Steady Fire

Back 225

A fire that has a constant heat release rate.

Front 226

Steam Boiler

Back 226

A boiler designed to convert water into steam that is supplied to an external system.

Front 227

Steam Generator

Back 227

A pressure vessel in which water is converted to steam or steam is superheated, or in which any combination thereof takes place.

Front 228

Steam Generator Capacity

Back 228

The manufacturer’s stated steam output rate over a period of time for which the steam generator is designed to operate.

Front 229

Steam Generator Enclosure

Back 229

The physical boundary for all steam generator pressure parts and the combustion process.

Front 230

Steel

Back 230

General purpose, hot- or cold-rolled, low carbon steel.

Front 231

Steel Cutting Tools

Back 231

Hand tools, circular saw, exothermic torch, oxyacetylene torch, and plasma cutter.

Front 232

Steel Fireplace Unit

Back 232

A unit consisting of a steel firebox and an air chamber adjacent to the sides and rear of the firebox, used to construct a masonry fireplace. The unit usually has ducts to circulate air to and heated air from the air chamber to the living space.

Front 233

Steel or Other Equivalent
Material

Back 233

Any noncombustible construction that has structural and thermal integrity properties equivalent to steel at the end of the applicable exposure to the standard fire test.

Front 234

Steering Axle(s)

Back 234

Any axle(s) designed such that the wheels have the ability to turn the vehicle.

Front 235

Steering Drive Ends

Back 235

In the front wheel spindle in a driving-steering axle as used at the front of an all-wheel drive vehicle.

Front 236

Stem

Back 236

The most forward portion of the hull.

Front 237

Stemple

Back 237

A man-made or natural beam or bar that, when wedged, serves as a removable anchor point.

Front 238

Stepped Stand

Back 238

Containers placed in rows and these rows are placed at different levels to form a stepped arrangement.

Front 239

Step Potential

Back 239

A ground potential gradient difference that can cause current flow from foot to foot through the body.

Front 240

Sterilization

Back 240

The use of a physical or chemical procedure to destroy all microbial life, including highly resistant bacterial endospores.

Front 241

Sterilization Building

Back 241

A detached building, which is comprised of all ancillary systems and rooms supporting the sterilization process, including the mechanical rooms, electrical room, preconditioning room or preconditioning cells, conveyance rooms, preheat room, sterilizer room, aeration room or cells, emissions control area, ethylene oxide drum storage room, gas transfer room, unprocessed and processed product storage areas, control room, process maintenance areas, and offices directly related to the sterilization process.

Front 242

Stern

Back 242

The after end of boat or vessel.

Front 243

Stern

Back 243

The after end of boat or vessel. [1405, 2006]

Front 244

Stevedore

Back 244

A person employed for the loading and unloading of ships, sometimes called a longshoreman.

Front 245

Still

Back 245

An appliance that distills a solvent to remove contaminants and recover the solvent in the drycleaning process.

Front 246

Stoichiometric Mixture

Back 246

A balanced mixture of fuel and oxidizer such that no excess of either remains after combustion.

Front 247

Stoichiometric Mixture

Back 247

A balanced mixture of fuel and oxidizer such that no excess of either remains after combustion. [53, 2004]

Front 248

Stoker Gate

Back 248

An element of a stoker placed at the point of entrance of fuel into the furnace and by means of which the depth of fuel on the stoker grate is controlled. It is generally used in connection with chain or traveling grate stokers and has the form of a guillotine.

Front 249

Storable Swimming, Wading, or
Immersion Pool

Back 249

Those that are constructed on or above the ground and are capable of holding water to a maximum depth of 1.0 m (42 in.), or a pool with nonmetallic, molded polymeric walls or inflatable fabric walls regardless of dimension.

Front 250

Storage

Back 250

An inventory of compressed gases or cryogenic fluids in containers that are not in the process of being examined, serviced, refilled, loaded, or unloaded.

Front 251

Storage

Back 251

An inventory of compressed gases or cryogenic fluids in containers that are not in the process of being examined, serviced, refilled, loaded, or unloaded. [55, 2005]

Front 252

Storage Aids

Back 252

Commodity storage devices, such as pallets, dunnage, separators, and skids.

Front 253

Storage Aids

Back 253

Commodity storage devices, such as pallets, dunnage, separators, and skids. [13, 2007]

Front 254

Storage Area

Back 254

An area where flame effect material or flame effect devices are stored prior to use or movement to a holding area.

Front 255

Storage Battery

Back 255

A battery comprised of one or more rechargeable cells of the lead-acid, nickel-cadmium, or other rechargeable electrochemical types.

Front 256

Storage Building

Back 256

A building, structure, or facility in which consumer fireworks in any state of processing are stored, but in which no processing or manufacturing is performed.

Front 257

Storage Building

Back 257

Any building or structure in the rocket motor plant in which model rocket motors or high power rocket motors in any state of processing or finished model rocket motors or high power rocket motors are stored, but in which no processing or manufacturing is actually performed.

Front 258

Storage Cabinet

Back 258

A cabinet for the storage of flammable and combustible liquids constructed in accordance with Section 6.3 of NFPA 30, Flammable and Combustible Liquids Code.

Front 259

Storage Height

Back 259

The height from the finished floor to the top of the highest container.

Front 260

Storage Life

Back 260

The date to remove from service a liquid splash-protective ensemble, element, or clothing item that has undergone proper care and maintenance in accordance with the manufacturer’s instructions but has not been used either in training or at actual incidents.

Front 261

Storage Life

Back 261

The date to remove from service a vapor-protective ensemble or individual element that has undergone proper care and maintenance in accordance with manufacturer’s instructions but has not been used either in training or at actual incidents.

Front 262

Storage Life

Back 262

The life expectancy of the CBRN protective ensemble and ensemble elements from the date of manufacture when it is only stored and inspected and has undergone proper care and maintenance in accordance with manufacturer’s instructions, but not used, donned, doffed, or repaired.

Front 263

Storage (Material)

Back 263

The keeping, retention, or leaving of hazardous materials in closed containers, tanks, cylinders, or similar vessels; or vessels supplying operations through closed connections to the vessel.

Front 264

Storage Occupancy

Back 264

An occupancy used primarily for the storage or sheltering of goods, merchandise, products, vehicles, or animals. [101:3.3]

Front 265

Storage Occupancy

Back 265

An occupancy used primarily for the storage or sheltering of goods, merchandise, products, or vehicles.

Front 266

Storage Occupancy

Back 266

An occupancy used primarily for the storage or sheltering of goods, merchandise, products, or vehicles. [5000, 2009]

Front 267

Storage Occupancy

Back 267

An occupancy used primarily for the storage or sheltering of goods, merchandise, products, vehicles, or animals. [101, 2006]

Front 268

Storage Pressure

Back 268

The varying pressure in the storage containers.

Front 269

Storage Room

Back 269

Enclosed room within a building containing tack and equipment used for animal handling, capture, restraint, grooming, training, care, and upkeep of the animal facility.

Front 270

Storage Tank

Back 270

Any vessel having a liquid capacity that exceeds 230 L (60 gal), is intended for fixed installation, and is not used for processing. [30, 2003]

Front 271

Storage Tank

Back 271

Any vessel having a liquid capacity that exceeds 60 gal (230 L), is intended for fixed installation, and is not used for processing.

Front 272

Storage Tank

Back 272

Any vessel having a liquid capacity that exceeds 60 gal (230 L), is intended for fixed installation, and is not used for processing. [30, 2008]

Front 273

Storage Tank

Back 273

A tank used for the storage of new or distilled solvent which is not an integral part of the drycleaning machine.

Front 274

Storage Tank Building

Back 274

A three-dimensional space that is enclosed by a roof and walls that cover more than one-half of the possible area of the sides of the space, is of sufficient size to allow entry by personnel, will likely limit the dissipation of heat or dispersion of vapors, and restricts access for fire fighting.

Front 275

Storage Tank Building

Back 275

A three-dimensional space that is enclosed by a roof and walls that cover more than one-half of the possible area of the sides of the space, is of sufficient size to allow entry by personnel, will likely limit the dissipation of heat or dispersion of vapors, and restricts access for fire fighting. [30, 2008]

Front 276

Store

Back 276

A building classified as a mercantile occupancy that contains a variety of merchandise and that is not used primarily for the retail sales of consumer fireworks.

Front 277

Store

Back 277

As used in Chapter 65, a building classified as a mercantile occupancy that contains a variety of merchandise and that is not used primarily for the retail sales of consumer fireworks.
[1124, 2006]

Front 278

Stored Emergency Power
Supply System (SEPSS)

Back 278

A system consisting of a UPS, a central battery system, or a motor generator, powered by a stored electrical energy source, together with a transfer switch designed to monitor preferred and alternate load power source and provide desired switching of the load, and all necessary control equipment to make the system functional.

Front 279

Stored Emergency Power
Supply System (SEPSS)

Back 279

A system consisting of a UPS, a central battery system, or a motor generator, powered by a stored electrical energy source, together with a transfer switch designed to monitor preferred and alternate load power source and provide desired switching of the load, and all necessary control equipment to make the system functional. [111,
2005]

Front 280

Stored-Pressure Fire
Extinguisher

Back 280

A fire extinguisher in which both the extinguishing material and expellant gas are kept in a single container, and that includes a pressure indicator or gauge.

Front 281

Stories in Height

Back 281

The story count starting with the level of exit discharge and ending with the highest occupiable level containing the occupancy considered.

Front 282

Stories in Height

Back 282

The story count starting with the level of exit discharge and ending with the highest occupiable story containing the occupancy considered.

Front 283

Storm Sewer

Back 283

A pipe or conduit that carries storm water and surface water, street wash and other wash water, or drainage but that excludes domestic wastewater and industrial wastes (also called storm drain).

Front 284

Story

Back 284

The portion of a building located between the upper surface of a floor and the upper surface of the floor or roof next above.

Front 285

Story

Back 285

The portion of a building located between the upper surface of a floor and the upper surface of the floor or roof next above.
[101, 2006] (SIG-FUN)

Front 286

Story

Back 286

The portion of a building located between the upper surface of a floor and the upper surface of the floor or roof next above. [5000, 2006]

Front 287

Story

Back 287

The portion of a building located between the upper surface of a floor and the upper surface of the floor or roof next above. [5000, 2009]

Front 288

Story (Accessibility)

Back 288

That portion of a building or facility designed for human occupancy located between the upper surface of a floor and the upper surface of the floor or roof next above. A story containing one or more mezzanines has more than one floor level.

Front 289

Story Height

Back 289

The vertical distance from the upper surface of a floor and upper surface of the floor or roof next above.

Front 290

Straight-Lift Fire Safety
Curtain

Back 290

A fire safety curtain consisting of one or more flat panel(s) that lifts up and stores above the proscenium opening.

Front 291

Straight Tip Nozzle

Back 291

A smooth-bore nozzle for producing a solid stream.

Front 292

Strainer

Back 292

A device capable of removing from the water all solids of sufficient size that are obstructing water spray nozzles.

Front 293

Strain Relief

Back 293

Cable termination that provides structural rigidity of conductors under conditions of flexure.

Front 294

Strategic

Back 294

Elements of incident management characterized by continuous
long-term, high-level planning by organizations headed by elected or
other senior officials.

Front 295

Strategy

Back 295

A comprehensive organizational plan that is designed to eliminate or mitigate risks that endanger lives, health, property, or the environment through public fire and life safety education programs.

Front 296

Strategy

Back 296

The general plan or direction selected to accomplish incident objectives.

Front 297

Strategy

Back 297

The general plan or direction selected to accomplish incident objectives. [1051, 2007]

Front 298

Stratification

Back 298

The phenomenon where the upward movement of smoke and gases ceases due to the loss of buoyancy. (SIG-IDS)

Front 299

Street

Back 299

A public thoroughfare that has been dedicated for vehicular use by the public and can be used for access by fire department vehicles.

Front 300

Street

Back 300

A public thoroughfare that has been dedicated for vehicular use by the public and can be used for access by fire department vehicles. [101, 2009]

Front 301

Street Circuit

Back 301

A closed, temporary course on closed public or private roadways on which there are turns in both directions and that might incorporate changes in elevation.

Front 302

Street Floor

Back 302

A story or floor level accessible from the street or from outside the building at ground level, with the floor level at the main entrance not more than three risers above or below ground level and arranged and utilized to qualify as the main floor. [101B:3.3]

Front 303

Street Floor

Back 303

A story or floor level accessible from the street or from outside the building at the finished ground level, with the floor level at the main entrance located not more than three risers above or below the finished ground level, and arranged and utilized to qualify as the main floor.

Front 304

Street Floor

Back 304

A story or floor level accessible from the street or from outside the building at the finished ground level, with the floor level at the main entrance located not more than three risers above or below the finished ground level, and arranged and utilized to qualify as the main floor. [101, 2009]

Front 305

Street Floor

Back 305

A story or floor level accessible from the street or from outside the building at the finished ground level, with the floor level at the main entrance not more than three risers above or below the finished ground level, and arranged and utilized to qualify as the main floor.

Front 306

Strength Design

Back 306

A method of proportioning structural members such that the computed forces produced in the members by the factored loads do not exceed the member design strength (also called load and resistance factor design). [ASCE/SEI 7:1.2]

Front 307

Stress

Back 307

The resultant internal force that resists change in the size or shape of
a body acted on by external forces. In this code, the term stress is often
used as being synonymous with unit stress, which is the stress per unit
area (psi).

Front 308

Stress Area

Back 308

Those areas of the garment that are subjected to more wear, including, but not limited to, crotches, knees, elbows, and shoulders.

Front 309

Stressed-Skin-Type Boom
Section

Back 309

A boom framework that is fabricated by the welding of metal into full box sections with internal torsional members.

Front 310

Strike Plate

Back 310

A wear plate for projecting hardware or a wear plate and keeper for a latch bolt.

Front 311

Strike Team

Back 311

Specified combinations of the same kind and type of resources, with common communications and a leader.

Front 312

Strike Team

Back 312

Specified combinations of the same kind and type of resources, with common communications and a leader. [1051, 2007]

Front 313

Strike Termination Device

Back 313

A component of a lightning protection system that intercepts lightning flashes and connects them to a path to ground. Strike termination devices include air terminals, metal masts, permanent metal parts of structures as described in Section 4.9, and overhead ground wires installed in catenary lightning protection systems.

Front 314

Striking Distance

Back 314

The distance over which the final breakdown of the initial lightning stroke to ground or to a grounded object occurs.

Front 315

Strip Light

Back 315

A luminaire with multiple lamps arranged in a row.

Front 316

Stripper

Back 316

A distillation column or tower, usually operated under vacuum, that is used to remove residual solvent from the extracted oil or fat.

Front 317

Strongback

Back 317

The vertical members of a trench shoring system placed in contact with the earth, usually held in place against sections of sheeting with shores and positioned so that individual members do not contact each other.

Front 318

Structural Element

Back 318

The columns and girders, beams, trusses, joists, braced frames, moment-resistant frames, and vertical and lateral resisting elements, and other framing members that are designed to carry any portion of the dead or live load and lateral forces, that are essential to the stability of the building or structure.

Front 319

Structural Element

Back 319

The columns and girders, beams, trusses, joists, braced frames, moment-resistant frames, and vertical and lateral resisting elements, and other framing members that are designed to carry any portion of the dead or live load and lateral forces, that are essential to the stability of the building or structure. [5000, 2009]

Front 320

Structural Fire Fighting

Back 320

The activities of rescue, fire suppression, and property conservation in buildings, enclosed structures, aircraft interiors, vehicles, vessels, aircraft, or like properties that are involved in a fire or emergency situation.

Front 321

Structural Fire Fighting

Back 321

The activities of rescue, fire suppression, and property conservation in buildings, enclosed structures, aircraft interiors, vehicles, vessels, aircraft, or like properties that are involved in a fire or emergency situation. [1710, 2004]

Front 322

Structural Fire Fighting

Back 322

The activities of rescue, fire suppression, and property conservation in buildings, enclosed structures, aircraft interiors, vehicles, vessels, aircraft, or like properties that are involved in a fire or emergency situation. [1710:3.3]

Front 323

Structural Fire Fighting

Back 323

The activities of rescue, fire suppression, and property conservation in buildings, enclosed structures, vehicles, marine vessels, or like properties that are involved in a fire or emergency situation.

Front 324

Structural Fire-Fighting Gloves

Back 324

An element of the protective ensemble designed to provide minimum protection to the fingers, thumb, hand, and wrist.

Front 325

Structural Fire-Fighting
Protective Clothing

Back 325

The fire resistant protective clothing normally worn by fire fighters during structural fire-fighting operations, which includes a helmet, coat, pants, boots, gloves, PASS device, and a fire resistant hood to cover parts of the head and neck not protected by the helmet and respirator facepiece.

Front 326

Structural Fire Fighting
Protective Coat

Back 326

The element of the protective ensemble that provides protection to the upper torso and arms, excluding the hands and head.

Front 327

Structural Fire Fighting
Protective Coverall

Back 327

The element of the protective ensemble that provides protection to the torso, arms, and legs, excluding the head, hands, and feet.

Front 328

Structural Fire Fighting
Protective Ensemble

Back 328

Multiple elements of compliant protective clothing and equipment that when worn together provide protection from some risks, but not all risks, of emergency incident operations.

Front 329

Structural Fire Fighting Protective Ensemble with Optional CBRN Terrorism Agent Protection

Back 329

A compliant structural fire fighting protective ensemble that is also certified as an entire ensemble to meet the optional requirements for protection from specific CBRN terrorism agents.

Front 330

Structural Fire Fighting Protective Ensemble with Optional CBRN Terrorism Agent Protection

Back 330

A compliant structural fire fighting protective ensemble that is also certified as an entire ensemble to meet the optional requirements for protection from specific chemical, biological, and radiological particulate terrorism agents.

Front 331

Structural Fire Fighting
Protective Footwear

Back 331

The element of the protective ensemble that provides protection to the foot, ankle, and lower leg.

Front 332

Structural Fire Fighting
Protective Garments

Back 332

The coat, trouser, and coverall elements of the protective ensemble.

Front 333

Structural Fire Fighting
Protective Glove

Back 333

The element of the protective ensemble that provides protection to the hand and wrist.

Front 334

Structural Fire Fighting
Protective Helmet

Back 334

The element of the protective ensemble that provides protection to the head.

Front 335

Structural Fire Fighting
Protective Hood

Back 335

The interface element of the protective ensemble that provides limited protection to the coat/helmet/SCBA facepiece interface area.

Front 336

Structural Fire Fighting
Protective Trousers

Back 336

The element of the protective ensemble that provides protection to the lower torso and legs, excluding the ankles and feet.

Front 337

Structural Fire Protection

Back 337

Fire protection that is intended to limit the spread of fire and smoke to as small an area as reasonable, by specifying fire endurance capabilities of structural elements.

Front 338

Structural Frame

Back 338

Frame composed of individual members of a building or structure required to transmit loads to the ground.

Front 339

Structural Frame

Back 339

Frame composed of individual members of a building or structure required to transmit loads to the ground. [5000, 2009]

Front 340

Structural Frame (Accessibility)

Back 340

The columns, girders, beams, and trusses having direct connections to the columns and all other members that are essential to the stability of a building or facility as a whole.

Front 341

Structural Glued Laminated
Timber

Back 341

Any member comprising an assembly of laminations of lumber in which the grain of all laminations is approximately parallel longitudinally, and in which the laminations are bonded with adhesives.

Front 342

Structural Integrity

Back 342

An unimpaired condition of any component.

Front 343

Structural Load Calculations

Back 343

Load calculations based on the weight per cubic foot of construction materials such as concrete, steel, and wood.

Front 344

Structurally Unsafe

Back 344

That situation where the stresses in any member due to the dead and live loads exceed 150 percent of the stresses allowed in the member or material.

Front 345

Structural Observation

Back 345

The periodic observation of the structural portions of construction by the registered design professional (RDP) responsible for design, or another RDP designated by the RDP responsible for design, to determine if the work is proceeding in general conformance to the approved construction documents and not including, or waiving the requirements for, any inspection required by this Code.

Front 346

Structural Parts

Back 346

The load-bearing parts of a model rocket, specifically, the nose cone, body tube, and fins.

Front 347

Structure

Back 347

An assembly of materials forming a construction for occupancy or use for a specific purpose.

Front 348

Structure

Back 348

That which is built or constructed.

Front 349

Structure

Back 349

That which is built or constructed. [101, 2009]

Front 350

Structure

Back 350

That which is built or constructed. [70, 2008]

Front 351

Structure

Back 351

That which is built or constructed and limited to buildings and nonbuilding structures.

Front 352

Structure

Back 352

That which is built or constructed and limited to buildings and non-building structures as defined herein. [5000, 2006]

Front 353

Structure

Back 353

That which is built or constructed and limited to buildings and nonbuilding structures as defined herein. [ASCE/SEI 7:11.2].

Front 354

Structure

Back 354

That which is built or constructed; an edifice or building of any kind.

Front 355

Structure

Back 355

That which is built or constructed, an edifice or building of any kind, or any piece of work artificially built up or composed of parts joined together in some definite manner.

Front 356

Structure Assessment

Back 356

An evaluation to determine the structure’s potential to be ignited by an approaching wildland fire.

Front 357

Structure Fire

Back 357

Any fire inside, on, under, or touching a structure.

Front 358

Structure (Flood Resistance)

Back 358

For all matters related to flood-resistant design and construction, a walled and roofed building, a gas or liquid storage tank that is principally above the finished ground level, as well as a manufactured home.

Front 359

Structure Ignition Zone

Back 359

The area around a specific structure and associated accessory structures, including all vegetation that contains potential ignition sources and fuels that can affect ignition potential during an intense wildland fire.

Front 360

Structure Protection

Back 360

To protect structures and other improvements from the threat of damage from an advancing wildland fire.

Front 361

Structure Protection Plan

Back 361

A plan specifying safe and effective methods to protect structures and other improvements from the threat of damage from an advancing fire.

Front 362

Structure-Supported Vault

Back 362

A vault that is supported by the framework of a fire-resistive building and that can be supported individually on any floor of such a building.

Front 363

Strut

Back 363

The tensioned member placed between two opposing surfaces.

Front 364

Struts

Back 364

Adjustable vertical members that extend from the head of the hollow metal door frame to the ceiling to hold the frame rigidly in place.

Front 365

Strut-Type Channel Raceway

Back 365

A metallic raceway that is intended to be mounted to the surface of or suspended from a structure, with associated accessories for the installation of electrical conductors and cables.

Front 366

Stuck Lumber

Back 366

Lumber storage piles with 2.5 cm (1 in.) runners perpendicular to the storage at every level.

Front 367

Student

Back 367

Any person who is present at the live fire training evolution for the purpose of receiving training.

Front 368

Subassembly

Back 368

An assembly of electrical devices connected together that forms a simple functional unit.

Front 369

Subatmospheric Gas Delivery
System (Type 2 SAGS)

Back 369

A gas source package that stores compressed gas and delivers gas subatmospherically and includes a container (e.g., gas cylinder and outlet valve) that stores gas at a pressure greater than 14.7 psia at NTP and delivers gas at a pressure of less than 14.7 psia at NTP.

Front 370

Subatmospheric Gas Storage and Delivery System
(Type 1 SAGS)

Back 370

A gas source package that stores and delivers gas at subatmospheric pressure and includes a container (e.g., gas cylinder and outlet valve) that stores and delivers gas at a pressure of less than 14.7 psia at NTP.

Front 371

Sub-Membrane
Depressurization System

Back 371

A system designed to achieve lower sub-membrane air pressure relative to crawl space air pressure by use of a vent drawing air from beneath the soil-gas retarder membrane.

Front 372

Submersible Pump

Back 372

A pump that is located inside a storage tank and positioned near the bottom of the tank, below the liquid level.

Front 373

Subplate

Back 373

An internal metal surface separate from the walls of an enclosure or controller on which various component parts of the controller are mounted and wired.

Front 374

Subscriber

Back 374

The recipient of a contractual supervising station signal service(s). In case of multiple, noncontiguous properties having single ownership, the term refers to each protected premises or its local management. (SIG-SSS)

Front 375

Subsidiary Station

Back 375

A subsidiary station is a normally unattended location that is remote from the supervising station and is linked by a communications channel(s) to the supervising station. Interconnection of signals on one or more transmission channels from protected premises with a communications channel(s) to the supervising station is performed at this location. (SIG-SSS)

Front 376

Substantial Damage

Back 376

For manufactured homes, including support and anchoring systems, located wholly or partly within the flood hazard areas, damage of any origin whereby the cost of restoring the manufactured home, including support and anchoring systems, to its predamage condition would equal or exceed 50 percent of the market value of the manufactured homes, including support and anchoring systems.

Front 377

Substantial Damage (Flood
Resistance)

Back 377

For buildings and structures located wholly or partly within the flood hazard area, damage of any origin whereby the cost of restoring the building or structure to its pre-damage condition would equal or exceed 50 percent of the market value of the building or structure.

Front 378

Substantial Improvement

Back 378

For manufactured homes, including support and anchoring systems located wholly or partly within the flood hazard area: (1) any repair, addition, reconstruction, rehabilitation or improvement of the manufactured home, including support and anchoring systems, the cost of which equals or exceeds 50 percent of the market value of the manufactured homes, including support and anchoring systems; (2) if a manufactured home, including support and anchoring systems, has sustained substantial damage, any repairs or reconstruction regardless of the actual work performed. Substantial improvement shall not include any project or improvement of a manufactured home
required to correct existing health, sanitary, or safety code violations identified by the AHJ, and that are the minimum necessary to assure safe living conditions.

Front 379

Substantial Improvement
(Flood Resistance)

Back 379

For buildings and structures located wholly or partly within the flood hazard area: (1) any repair, addition, reconstruction, rehabilitation, or improvement of the building or structure, the cost of which equals
or exceeds 50 percent of the market value of the building or structure before the alteration is started; or (2) if a building or structure has sustained substantial damage, any repairs or reconstruction regardless of the actual work performed. Substantial improvement shall not include the following: (1) any project or improvement of a building or structure required to correct existing health, sanitary, or safety code violations identified by the authority having jurisdiction, and that are the minimum necessary to assure safe living conditions; (2) any alteration of a historic building or structure, provided that the alteration will not preclude the continued designation as a historic building or structure.

Front 380

Substation Ground

Back 380

Grounding electrode system (grid) in a substation. See 29.1.6.28, Grounding Electrode System.

Front 381

Substructure

Back 381

The portion of the construction of a pier or wharf below, and including, the deck. (See Annex B.)

Front 382

Subsurface Foam Injection

Back 382

Discharge of foam into a storage tank from an outlet near the tank bottom.

Front 383

Subsurface Structure

Back 383

A structure located belowground, such as a manhole, sewer, utility conduit, observation well, storm drain, vault, water line, fuel gas distribution system, electric light and power conduit, telephone and telegraph communication line, street-lighting conduit, police and fire signal system, traffic signal line, refrigeration service line, steam line, petroleum pipeline, subway, tunnel, or the substructural areas of a building, such as a basement or parking garage.

Front 384

Subterranean Space

Back 384

A cavern resulting from the extraction of subsurface-located material from underground areas in a manner that the surface area of the property is not disturbed except in the vicinity of the entrances and ventilation openings.

Front 385

Suburban Area

Back 385

As defined by the U.S. Census Bureau, an area with between 500 people and 1000 people per square mile.

Front 386

Suburb or Suburban

Back 386

Those moderately inhabited areas with population densities of at least
500 persons per square mile but less than 1000 persons per square mile.

Front 387

Suburb or Suburban

Back 387

Those moderately inhabited areas with population densities of at least
500 persons per square mile but less than 1000 persons per square mile.
[1142, 2007]

Front 388

Suction Hose

Back 388

A hose that is designed to prevent collapse under vacuum conditions so that it can be used for drafting water from below the pump (lakes, rivers, wells, etc.).

Front 389

Suction Hose

Back 389

A hose that is designed to prevent collapse under vacuum conditions so that it can be used for drafting water from below the pump (lakes, rivers, wells, etc.). [1961, 2007]

Front 390

Suction Lift

Back 390

The sum of the vertical lift and the friction and entrance loss caused by the flow through the intake strainers and hose expressed in feet of water (meters of water) head.

Front 391

Suction Lift

Back 391

The sum of the vertical lift and the friction and entrance loss caused by the flow through the intake strainers and hose expressed in feet of water (meters of water) head. [1901, 2003]

Front 392

Suitable

Back 392

That which is appropriate and has the qualities or qualifications to meet a given purpose, occasion, condition, function, or circumstance.

Front 393

Suitable

Back 393

That which is appropriate and has the qualities or qualifications to meet a given purpose, occasion, condition, function, or circumstance. [122:3.3]

Front 394

Suit Closure

Back 394

The component that allows the wearer to enter (don) and exit (doff)
the liquid splash-protective ensemble.

Front 395

Suit Closure

Back 395

The component that allows the wearer to enter (don) and exit (doff)
the vapor-protective suit element.

Front 396

Suit Closure Assembly

Back 396

The combination of the suit closure and the seam attaching the suit closure to the suit garment, excluding any protective flap or cover.

Front 397

Suite (Health Care
Occupancies)

Back 397

A series of rooms or spaces or a subdivided room separated from the remainder of the building by walls and doors.

Front 398

Suit Material

Back 398

The principal material used in the construction of the vapor-protective suit.

Front 399

Sulfation

Back 399

The exothermic chemical reaction that takes place when calcium oxide unites with oxygen and sulfur dioxide to form calcium sulfate.

Front 400

Sulfur Capture

Back 400

The molar fraction of sulfur in the fuel input that is “captured” by calcium oxide to form calcium sulfate.

Front 401

Sulfur Dust

Back 401

Finely divided sulfur that presents a fire or deflagration hazard when suspended in air or other oxidizing medium over a range of concentrations regardless of particle size or shape.

Front 402

Sulfur Reacted

Back 402

In a fluidized bed, the fraction of the total sulfur in the fuel fed to the bed that is converted to sulfur dioxide or calcium sulfate.

Front 403

Sulfur Retention

Back 403

The molar ratio of the total sulfur in the fuel minus the sulfur leaving the unit as sulfur dioxide to the total sulfur in the fuel.

Front 404

Summarily Abate

Back 404

To immediately judge a condition to be a fire hazard to life or property and to order immediate correction of such condition.

Front 405

Sump

Back 405

A recessed area of a tank assembly designed primarily to entrap sludge or debris for removal and to serve as a central liquid collection point.

Front 406

Sump

Back 406

A recessed area of a tank assembly designed primarily to entrap sludge or debris for removal and to serve as a central liquid collection point. [1901, 2003]

Front 407

Superpressurization

Back 407

The addition of gas to a fire extinguishing agent container to achieve a specified pressure therein.

Front 408

Superstructure

Back 408

An enclosed structure above the main deck that extends from one side of the vessel to the other.

Front 409

Superstructure

Back 409

The portion of the construction of a pier or wharf above the deck.

Front 410

Supervise

Back 410

To sense and indicate a condition requiring attention and to automatically initiate corrective action.

Front 411

Supervised Flame

Back 411

A flame whose presence or absence is detected by a flame sensor connected to a combustion safeguard.

Front 412

Supervised Industrial
Installation

Back 412

For the purposes of Part VIII, the industrial portions of a facility where all of the following conditions are met:

Front 413

Supervised Lines

Back 413

Interconnecting lines in an alarm system that are electrically supervised against tampering. (See also 3.3.31, Line Supervision.)

Front 414

Supervising Station

Back 414

A facility that receives signals from protected premises fire alarm systems and at which personnel are in attendance at all times to respond to these signals. (SIG-SSS)

Front 415

Supervision

Back 415

A visual and audible alarm signal given at the central safety station to indicate when the system is in operation or when a condition that would impair the satisfactory operation of the system exists. Supervisory alarms shall give a distinct indication for each individual system component that is monitored.

Front 416

Supervision

Back 416

In water-based fire protection systems, a means of monitoring system status and indicating abnormal conditions.

Front 417

Supervisor

Back 417

An emergency services responder who has responsibility for
overseeing the performance of other responders assigned to a specific
division or group.

Front 418

Supervisor

Back 418

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

Front 419

Supervisor

Back 419

An individual responsible for overseeing the performance or activity of other members. [1021, 2003]

Front 420

Supervisor

Back 420

The individual responsible for a division or group.

Front 421

Supervisory Chief Officer

Back 421

A member whose responsibility is above that of a company officer, who responds automatically and/or is dispatched to an alarm beyond the initial alarm capabilities, or other special calls.

Front 422

Supervisory Chief Officer

Back 422

A member whose responsibility is to assume command through a formalized transfer of command process and to allow company officers to directly supervise personnel assigned to them.

Front 423

Supervisory Cock

Back 423

A manually actuated valve with two double-pole, double-throw switches that prove the valve position.

Front 424

Supervisory Control and Data
Acquisition (SCADA)

Back 424

An electronic system that provides monitoring and controls for the operation of the critical operations power system. This can include the fire alarm system, security system, control of the HVAC, the start/stop/monitoring of the power supplies and electrical distribution system, annunciation and communication equipment to emergency personnel, facility occupants, and remote operators.

Front 425

Supervisory Control System

Back 425

A manual or automatic control system that supervises the operation of the flame effect.

Front 426

Supervisory Device

Back 426

A device arranged to supervise the operative condition of automatic sprinkler systems.

Front 427

Supervisory Service

Back 427

The service required to monitor performance of guard tours and the operative condition of fixed suppression systems or other systems for the protection of life and property. (SIG-PRO)

Front 428

Supervisory Shutoff Valve

Back 428

In a gaseous or liquid fuel system, a manually operated shutoff valve with a means to provide a “valve closed” position signal.

Front 429

Supervisory Signal

Back 429

A signal indicating the need for action in connection with a pre-alarm condition, or in connection with the supervision of protected
premises carbon monoxide safety functions or equipment, or the maintenance features of related systems.

Front 430

Supervisory Signal

Back 430

A signal indicating the need for action in connection with the supervision of guard tours, the fire suppression systems or equipment, or the maintenance features of related systems.
[72, 2002]

Front 431

Supervisory Signal

Back 431

A signal indicating the need for action in connection with the supervision of guard tours, the fire suppression systems or equipment, or the maintenance features of related systems.
[72, 2007]

Front 432

Supervisory Signal

Back 432

A signal indicating the need for action in connection with the supervision of guard tours, the fire suppression systems or equipment, or the maintenance features of related systems. (SIG-FUN)

Front 433

Supervisory Signal-Initiating
Device

Back 433

An initiating device such as a valve supervisory switch, water level indicator, or low air pressure switch on a dry-pipe sprinkler system in which the change of state signals an off-normal condition and its restoration to normal of a fire protection or life safety system; or a need for action in connection with guard tours, fire suppression systems or equipment, or maintenance features of related systems. (SIG-IDS)

Front 434

Supervisory Signals

Back 434

A signal indicating the need for action in connection with the supervision of guard tours or environmental or other nonintrusion monitored point or system.

Front 435

Supplemental Sheeting and
Shoring

Back 435

Sheeting and shoring operations that involve the use of commercial sheeting/shoring systems and/or isolation devices or that involve cutting and placement of sheeting and shoring when greater than
0.61 m (2 ft) of shoring exists below the bottom of the strongback.

Front 436

Supplemental Sheeting and
Shoring

Back 436

Sheeting and shoring operations that involve the use of commercial sheeting/shoring systems and/or isolation devices or that involve cutting and placement of sheeting and shoring when greater than two feet of shoring exists below the bottom of the strongback.

Front 437

Supplementary

Back 437

As used in this Code, supplementary refers to equipment or operations not required by this Code and designated as such by the authority having jurisdiction. (SIG-FUN)

Front 438

Supplementary Boiler

Back 438

A boiler, designed to burn one type of fuel (gas, oil, or solid), that is intended for supplementing a boiler burning another type of fuel (gas, oil, or solid) by means of a common heat transfer medium.

Front 439

Supplementary Firing

Back 439

The provision of duct burners in an HRSG to increase the temperature of the combustion turbine exhaust gases.

Front 440

Supplementary Fuel

Back 440

Fuel burned to supply additional heat to the steam generator or to support combustion.

Front 441

Supplementary Furnace

Back 441

A furnace designed to burn one type of fuel (gas, oil, or solid) that is intended for supplementing a central warm-air furnace burning another type of fuel (gas, oil, or solid) by means of a common warm-air supply plenum.

Front 442

Supplementary Indicators

Back 442

Figures, numbers, subscripts, or letter abbreviations used to enhance the effectiveness of symbols.

Front 443

Supplementary Overcurrent
Protective Device

Back 443

A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as found within industrial machines. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.

Front 444

Supplementary Overcurrent
Protective Device

Back 444

A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires and appliances. This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device.

Front 445

Supplied Air Respirator (SAR)

Back 445

An atmosphere-supplying respirator, also known as an airline respirator, for which the source of breathing air is not designed to be carried by the user. [See also 3.3.1, Atmosphere-Supplying Respirator; 3.3.3, Combination SCBA/SAR; and 3.3.14, Self-Contained Breathing Apparatus (SCBA).]

Front 446

Supplied Air Respirator (SAR)

Back 446

An atmosphere-supplying respirator, also known as an airline respirator, for which the source of the breathing air is not designed to be carried by the user. Also known as an “airline respirator.”

Front 447

Supplied Air Respirator (SAR)

Back 447

An atmosphere-supplying respirator for which the source of breathing air is not designed to be carried by the user; also known as an airline respirator. [See also 3.3.2, Atmosphere-Supplying Respirator; 3.3.10, Combination SCBA/SAR; and 3.3.40, Self-Contained Breathing Apparatus (SCBA).]

Front 448

Supplied-Air Respirator (SAR)
or Air-Line Respirator

Back 448

An atmosphere-supplying respirator for which the source of breathing air is not designed to be carried by the user.

Front 449

Supplier

Back 449

An entity (e.g., manufacturer, contractor, installer, integrator) that provides equipment or services associated with the machine.

Front 450

Supply Calculation Method

Back 450

Hydraulic calculation procedure for determining the maximum theoretical flows and pressures in a system with a specific configuration of piping and discharge devices supplied by a water distribution system.

Front 451

Supply Hose

Back 451

Hose designed for the purpose of moving water between a pressurized water source and a pump that is supplying attack lines.

Front 452

Supply Hose

Back 452

Hose designed for the purpose of moving water between a pressurized water source and a pump that is supplying attack lines. [1961, 2007]

Front 453

Supply Line

Back 453

One or more lengths of connected fire hose, also called a leader line, used to provide water to wyed lines or to the intake of a pump.

Front 454

Supply Pressure

Back 454

The pressure within the supply (e.g., city or private supply water source).

Front 455

Supply System

Back 455

An assembly of connected ducts, air passages, or plenums and fittings through which air is conducted to the space or spaces to be conditioned.

Front 456

Supply Unit

Back 456

Functional unit within the support branch of the logistics section responsible for ordering equipment and supplies required for incident operations.

Front 457

Support Branch

Back 457

A branch within the logistics section responsible for providing the personnel, equipment, and supplies to support incident operations, including the supply unit, facilities unit, and ground support unit.

Front 458

Support Gas

Back 458

Nitrogen or instrument air that is used to support medical procedures by operating medical-surgical tools, equipment booms, pendants, and similar devices, and are not respired as part of any treatment. (PIP)

Front 459

Support Member

Back 459

Personnel assigned to the industrial fire brigade to perform specific response duties, including those people who have specific technical knowledge or skills or who have been given specific assignments that indirectly support manual fire suppression efforts. [600, 2005]

Front 460

Support Members

Back 460

Personnel assigned to the industrial fire brigade to perform specific response duties, including those people who have specific technical knowledge or skills or who have been given specific assignments that indirectly support manual fire suppression efforts.

Front 461

Support Personnel

Back 461

Any individual who is not a performer or member of the audience.

Front 462

Support Room

Back 462

An enclosure or area, excluding the test cell or control room, that is an integral part of engine testing, including fuel-handling rooms, hydraulic rooms, preparation areas, and mechanical/electrical rooms.

Front 463

Support System

Back 463

A structure, such as underpinning, bracing, or shoring, that provides support to an adjacent structure, underground installation, or the sides of an excavation.

Front 464

Support System

Back 464

A structure, such as underpinning, bracing, or shoring that provides support to an adjacent structure, underground installation, or the sides of an excavation. [1670, 2004]

Front 465

Support System

Back 465

Piers, foundation walls, and other equivalent systems approved in accordance with 4.5.1.3 and their footings, anchorage to the manufactured home, shims, and any combination thereof that, when properly installed, support the manufactured home.

Front 466

Suppressant

Back 466

The chemical agent used in a deflagration suppression system to extinguish the deflagration.

Front 467

Suppressed Voltage Rating
(SVR)

Back 467

A specific measured limiting voltage rating assigned to a surge protective device (SPD).

Front 468

Suppress Fire

Back 468

Perform actions on a fire process in order to limit the growth of or extinguish the fire.

Front 469

Suppression

Back 469

Extinguishment or active limitation of fire growth.

Front 470

Suppression

Back 470

The sum of all the work done to extinguish a fire, beginning at the time of its discovery.

Front 471

Surcharge Load

Back 471

Any weight in the proximity of the trench that increases instability or the likelihood of secondary cave-in.

Front 472

Surcharge Load

Back 472

Any weight near the lip of the trench that increases the likelihood of instability or secondary cave-in.

Front 473

Surface

Back 473

A base that is secure and conducive to supporting and stabilizing a vehicle or object.

Front 474

Surface Active Agent
(Surfactant)

Back 474

A chemical agent that materially reduces the surface tension of water.

Front 475

Surface Encumbrance

Back 475

A natural or man-made structural object adjacent to or in the immediate vicinity of an excavation or trench.

Front 476

Surface Metal Raceway

Back 476

A metallic raceway that is intended to be mounted to the surface of a structure, with associated couplings, connectors, boxes, and fittings for the installation of electrical conductors.

Front 477

Surface-Mounted Medical Gas
Rail Systems

Back 477

A surface-mounted gas delivery system intended to provide ready access for two or more gases through a common delivery system to provide multiple gas station outlet locations within a single patient room or critical care area. (PIP)

Front 478

Surface Movement Guidance and Control System (SMGCS)

Back 478

A process or plan used by airports conducting operations in visibility conditions less than 366 m (1200 ft) runway visual range (RVR).

Front 479

Surface Nonmetallic Raceway

Back 479

A nonmetallic raceway that is intended to be mounted to the surface of a structure, with associated couplings, connectors, boxes, and fittings for the installation of electrical conductors.

Front 480

Surface Structure

Back 480

Any at-grade or unroofed structure other than an elevated or underground structure.

Front 481

Surface Tension

Back 481

The elastic-like force at the surface of a liquid, which tends to minimize the surface area, causing drops to form.

Front 482

Surface Tension

Back 482

The elastic-like force at the surface of a liquid, which tends to minimize the surface area, causing drops to form. [1150, 2004]

Front 483

Surface Water Rescue

Back 483

Rescue of a victim who is afloat on the surface of a body of water.

Front 484

Surge

Back 484

A transient wave of current, potential, or power in an electric circuit. Surges do not include longer duration temporary overvoltages (TOV) consisting of an increase in the power frequency voltage for several cycles.

Front 485

Surge Arrester

Back 485

A protective device for limiting surge voltages by discharging or bypassing surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions.

Front 486

Surge Arrester

Back 486

A protective device for limiting surge voltages by discharging or bypassing surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions. [70: Article 100]

Front 487

Surge Protective Device (SPD)

Back 487

A device composed of any combination of linear or nonlinear circuit elements intended for limiting surge voltages on equipment by diverting or limiting surge current.

Front 488

Surge-Protective Device (SPD)

Back 488

A protective device for limiting transient voltages by diverting or limiting surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions and is designated as follows:

Front 489

Surreptitious Entry

Back 489

The unauthorized entry into a facility or security container in a manner such that evidence of the entry is not discernable under normal circumstances.

Front 490

Surrogate Cylinder

Back 490

A breathing air cylinder for testing only in which the mass of the breathing air is replaced by a substitute mass.

Front 491

Survey

Back 491

The collection of accurate data on the electrical system and the evaluation of this data to obtain the necessary information for developing the EPM program. The systems and equipment covered in specific parts of the survey should be based on logical divisions of the electrical system.

Front 492

Survival Angle

Back 492

The maximum angle to which a vessel is permitted to heel after the assumed damage required by stability regulations is imposed.

Front 493

Survival Craft

Back 493

Craft capable of sustaining the lives of persons in distress after abandoning the vessel on which they were originally carried.

Front 494

Suspension

Back 494

The energy attenuating system of the helmet that is made up of the headband and crown strap.

Front 495

Suspension System

Back 495

The components utilized to attach the axle(s) to the frame assembly.

Front 496

Sustained Attack

Back 496

The activities of fire confinement, control, and extinguishment that are beyond those assigned to the initial responding companies.

Front 497

Sustained Flaming

Back 497

For the purposes of this standard, the uninterrupted existence of a flame on or over the surface of a test specimen for a specified time period.

Front 498

Sustained Flaming

Back 498

The existence of flame for a period of at least 4 seconds.

Front 499

Sustained Voltage Interruption

Back 499

The loss of the supply voltage to less than 10 percent on one or more phases for a period greater than 1 minute.

Front 500

Swarf

Back 500

Particles produced from a cutting, machining, or grinding operation that causes partial oxidation of the parent material or dilution by other inert materials.

Front 501

Swash Partition

Back 501

A vertical wall within a tank structure designed to control the unwanted movement of the fluid within that tank.

Front 502

Swash Partition

Back 502

A vertical wall within a tank structure designed to control the unwanted movement of the fluid within that tank. [1901, 2003]

Front 503

Sway Brace

Back 503

An assembly intended to be attached to the piping to resist horizontal earthquake loads.

Front 504

Sweatband

Back 504

That part of a helmet headband, either integral or attached, that comes in contact with the wearer’s forehead.

Front 505

Swell

Back 505

An increase to between 110 percent and 180 percent in normal voltage at the power frequency durations from 0.5 cycle to 1 minute. It is further classified into three categories: (1) instantaneous — 0.5 cycle-30 cycles; (2) momentary — 30 cycles-3 sec; and (3) temporary
— 3 sec-1 min.

Front 506

Swift Water

Back 506

Water moving at a rate greater than 1 knot [1.85 km/hr (1.15 mph)]. [1670, 2004]

Front 507

Swift Water

Back 507

Water moving at a rate greater than one knot [1.85 km/hr (1.15 mph)].

Front 508

Swim

Back 508

To propel oneself through water by means of purposeful body movements and positioning.

Front 509

Swim Aids

Back 509

Items of personal equipment that augment the individual rescuer’s ability to propel through water.

Front 510

Swimming Pool

Back 510

Any constructed pool intended for swimming or diving, permanent or nonportable, that is over 24 in. (610 mm) in depth, has a surface area exceeding 250 ft2 (23 m2) or a volume over 3250 gal (12,300 L).

Front 511

Switch

Back 511

Any set of contacts that interrupts or controls current flow through an electrical circuit.

Front 512

Switchboard

Back 512

A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.

Front 513

Switchboard

Back 513

A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.
[70, 2008]

Front 514

Switch, Bypass Isolation

Back 514

A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch.

Front 515

Switched Telephone Network

Back 515

An assembly of communications facilities and central office equipment operated jointly by authorized service providers that provides the general public with the ability to establish transmission channels via discrete dialing. (SIG-SSS)

Front 516

Switchgear, Arc-Resistant

Back 516

Equipment designed to withstand the effects of an internal arcing fault and that directs the internally released energy away from the employee.

Front 517

Switchgear, Metal-Clad

Back 517

A switchgear assembly completely enclosed on all sides and top with sheet metal, having drawout switching and interrupting devices, and all live parts enclosed within grounded metal compartments.

Front 518

Switchgear, Metal-Enclosed

Back 518

A switchgear assembly completely enclosed on all sides and top with sheet metal (except for ventilating openings and inspection windows), containing primary power circuit switching, interrupting devices, or both, with buses and connections. This assembly may include control and auxiliary devices. Access to the interior of the enclosure is provided by doors, removable covers, or both. Metal-enclosed switchgear is available in non-arc-resistant or arc-resistant constructions.

Front 519

Switch, General-Use

Back 519

A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage.

Front 520

Switch, General-Use Snap

Back 520

A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this Code.

Front 521

Switching Device

Back 521

A device designed to close, open, or both, one or more electrical circuits.

Front 522

Switching Device

Back 522

A device designed to close, open, or both, one or more electric circuits.

Front 523

Switching Device

Back 523

A device designed to make or break the current in one or more electric circuits.

Front 524

Switch, Isolating

Back 524

A switch intended for isolating an electrical circuit from the 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 525

Switch, Isolating

Back 525

A switch intended for isolating an electric circuit from the 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. [70,
2008]

Front 526

Switch, Motor-Circuit

Back 526

A switch rated in horsepower that is capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage.

Front 527

Switch, Transfer

Back 527

An automatic or nonautomatic device for transferring one or more load conductor connections from one power source to another.

Front 528

Symbol

Back 528

A graphic representation of a referent.

Front 529

Synthetic Breathing Air

Back 529

A manufactured breathing air that is produced by blending nitrogen and oxygen. [1989, 2008]

Front 530

Synthetic Breathing Air

Back 530

A manufactured breathing air that is produced by blending nitrogen and oxygen. (See also 3.3.13, Compressed Breathing Air.)

Front 531

Synthetic Breathing Air

Back 531

A manufactured breathing air that is produced by blending nitrogen and oxygen. (See also 3.3.7, Compressed Breathing Air.)

Front 532

Synthetic Foam Concentrate

Back 532

Concentrate based on foaming agents other than hydrolyzed proteins and including aqueous film-forming foam (AFFF) concentrates, medium- and high-expansion foam concentrates, and other synthetic foam concentrates.

Front 533

Synthetic Foam Concentrate

Back 533

Concentrate based on foaming agents other than hydrolyzed proteins and including aqueous film-forming foam (AFFF) concentrates, medium- and high-expansion foam concentrates, and other synthetic foam concentrates. [11, 2005]

Front 534

Synthetic or Artificial Sea
Water

Back 534

A solution consisting of 1.10 percent magnesium chloride hexahydrate, 0.16 percent calcium chloride dihydrate, 0.40 percent anhydrous sodium sulfate, 2.50 percent sodium chloride, and
95.84 percent deionized or distilled water.

Front 535

Synthetic Special Atmosphere

Back 535

A special atmosphere such as those of anhydrous ammonia, hydrogen, nitrogen, or inert gases obtained from compressed gas cylinders or bulk storage tanks and those derived by chemical dissociation or mixing of hydrocarbon fluids, including mixtures of synthetic and generated atmospheres.

Front 536

System

Back 536

An organized or established procedure intended to form a network arranged to achieve specific goals.

Front 537

System

Back 537

Several items of equipment assembled, grouped, or otherwise interconnected for the accomplishment of a purpose or function.

Front 538

System Actuation Valve

Back 538

The main valve that controls the flow of water into the fire protection system.

Front 539

System Actuation Valve

Back 539

The main valve that controls the flow of water into the water spray system.

Front 540

System Demand

Back 540

The flow rate and residual pressure required from a water supply, measured at the point of connection of a water supply to a standpipe system, to deliver the total waterflow rate and the minimum residual pressures required for a standpipe system at the hydraulically most remote hose, and the minimum waterflow rate for sprinkler connections on combined systems.

Front 541

System Grounding

Back 541

The intentional connection of an electrical supply system to its associated grounding electrode(s).

Front 542

System Input

Back 542

The input pressure or electrical power that the powered rescue tool is subjected to at any given moment.

Front 543

System Isolation Equipment

Back 543

A redundantly monitored, remotely operated contactor-isolating system, packaged to provide the disconnection/isolation function, capable of verifiable operation from multiple remote locations by means of lockout switches, each having the capability of being padlocked in the “off” (open) position.

Front 544

System Isolation Equipment

Back 544

A redundantly monitored, remotely operated contactor-isolation system, packaged to provide the disconnecting/isolation function, capable of verifiable operation from multiple remote locations by means of lockout switches, each having the capability of being padlocked in the OFF (open) position. [70:430.2]

Front 545

System Pressure

Back 545

The pressure within the system (e.g., above the control valve).

Front 546

System Riser

Back 546

The aboveground horizontal or vertical pipe between the water supply and the mains (cross or feed) that contains a control valve (either directly or within its supply pipe) and a waterflow alarm device.

Front 547

Systems

Back 547

An assembly of equipment that consists essentially of liquefied petroleum gas unloading equipment; a container or containers; major devices such as vaporizers, relief valves, excess-flow valves, and regulators; and interconnecting piping. In the case of refrigerated storage, it also includes compressors, condensers, and other related equipment and controls. Such systems include any unloading equipment, storage equipment, or interconnecting piping up to the outlet of the first stage regulator, vaporizer, or mixing device, whichever is the last unit before the liquefied petroleum gas enters other plant equipment or distribution lines.

Front 548

System Safety Check

Back 548

A method of evaluating the safe assembly of a rescue system.

Front 549

System Safety Factor

Back 549

The weakest point within a system, expressed as a ratio between the minimum breaking strength of that point (component) as compared to the force placed upon it.

Front 550

System Stress

Back 550

Any condition creating excessive force (i.e., exceeding the maximum working load of any component) to components within a rope rescue system that could lead to damage or failure of the system.

Front 551

System Unit

Back 551

The active subassemblies at the supervising station used for signal receiving, processing, display, or recording of status change signals; a failure of one of these subassemblies causes the loss of a number of alarm signals by that unit. (SIG-SSS)

Front 552

System Working Pressure

Back 552

The maximum anticipated static (nonflowing) or flowing pressure applied to sprinkler system components exclusive of surge pressures.

Front 553

System Working Pressure

Back 553

The maximum anticipated static (nonflowing) or flowing pressure applied to sprinkler system components exclusive of surge pressures and exclusive of pressure from the fire department connection.

Front 554

Tabletop Training

Back 554

A workshop style of training involving a realistic emergency scenario and requiring problem-solving participation by personnel responsible for management and support at emergencies.

Front 555

Tabulated Data

Back 555

Any set of site-specific design data used by a professional engineer to design a protective system at a particular location.

Front 556

Tabulated Data

Back 556

Any set of site-specific design data used by a professional engineer to design a protective system at a particular location. [1670, 2004]

Front 557

Tack

Back 557

Stable gear; also harnesses, bridles, saddles, and other accessories used in riding or driving horses.

Front 558

Tack Room

Back 558

A storage area for tack and stable equipment.

Front 559

Tactical Considerations

Back 559

Specific fire-fighting objectives that are intended to support the strategy of the incident.

Front 560

Tactical Level Management
Component (TLMC)

Back 560

A management unit identified in an incident management system commonly known as “division” or “group.”

Front 561

Tactical Level Management
Component (TLMC)

Back 561

A management unit identified in the incident management system commonly known as “division,” “group,” or “sector.” [1561, 2005]

Front 562

Tactical Radio Channel

Back 562

A radio channel designated by the emergency services organization that is provided for communications between resources assigned to an incident and the incident commander.

Front 563

Tactics

Back 563

Deploying and directing resources on an incident to accomplish the objectives designated by strategy.

Front 564

Tactics

Back 564

Deploying and directing resources on an incident to accomplish the objectives designated by strategy. [1051, 2007]

Front 565

Tactics

Back 565

The method of securing the objectives laid out in the strategy through the use of personnel and equipment to achieve optimum results.

Front 566

Tactile (Accessibility)

Back 566

Describes an object that can be perceived by using the sense of touch.

Front 567

Tactile Notification Appliance

Back 567

A notification appliance that alerts by the sense of touch or vibration. (SIG-NAS)

Front 568

Tagout

Back 568

A method of tagging, labeling, or otherwise marking an isolation device during hazard abatement operations to prevent accidental removal of the device. (See also 3.3.74, Lockout.)

Front 569

Tail Gasket

Back 569

A gasket in the bowl of a coupling used to provide a watertight seal between the coupling and the hose in an expansion ring-type coupling.

Front 570

Tail Height

Back 570

The maximum tail height as stated in aircraft manufacturers’
specifications.

Front 571

Talkgroup

Back 571

A group of radios addressed as a single entity by the system and functionally equivalent to a conventional repeater channel.

Front 572

Tank

Back 572

A closed vessel having a liquid capacity in excess of 227 L (60 gal).

Front 573

Tank

Back 573

A closed vessel having a liquid capacity in excess of 227 L (60 U.S. gal).

Front 574

Tank

Back 574

A container constructed in accordance with the Section VIII, “Rules for the Construction of Unfired Pressure Vessels” of the ASME Boiler and Pressure Vessel Code.

Front 575

Tank

Back 575

A stationary or portable device that is intended to contain an accumulation of hazardous substances that is large enough to allow human entry.

Front 576

Tank

Back 576

A structure above the finished ground level that encloses a volume that either holds bulk solids or liquids or simulates that.

Front 577

Tank

Back 577

For purposes of tank entry, cleaning, or repair, a stationary or portable vessel large enough to allow human entry that is intended to contain an accumulation of hazardous substances.

Front 578

Tank Baffle

Back 578

A nonliquidtight transverse partition in a cargo tank.

Front 579

Tank Compartment

Back 579

A liquidtight division in a cargo tank.

Front 580

Tank Compartment

Back 580

A space on a marine vessel that is dedicated for fuel tanks and is too small for an individual to enter.

Front 581

Tank Full Trailer

Back 581

A vehicle that is not self-propelled and that has a cargo tank for the transportation of aviation fuel mounted thereon or built as an integral part thereof. It is so constructed that its weight and load rest on its own wheels.

Front 582

Tank Room

Back 582

A space on a marine vessel dedicated for fuel tanks that is large enough for an individual to enter.

Front 583

Tank Semitrailer

Back 583

A vehicle that is not self-propelled and that has a cargo tank for the transportation of aviation fuel mounted thereon or built as an integral part thereof. It is so constructed that when drawn by a tractor by
means of a fifth wheel connection, some of its load and weight rests upon the towing vehicle.

Front 584

Tank Ship

Back 584

A vessel that carries flammable or combustible liquids in bulk.

Front 585

Tank Top

Back 585

The lowest deck, top plate of the bottom tanks.

Front 586

Tank Truck

Back 586

Any single self-propelled motor vehicle equipped with a cargo tank mounted thereon and used for the transportation of flammable and combustible liquids or asphalt.

Front 587

Tank Truck

Back 587

Any single self-propelled motor vehicle equipped with a cargo tank mounted thereon and used for the transportation of flammable and combustible liquids or asphalt. [385, 2000]

Front 588

Tank Vehicle

Back 588

Any tank truck, tank full-trailer, or tractor and tank semi-trailer combination.

Front 589

Tank Vessel

Back 589

Any vessel especially constructed or converted to carry liquid bulk cargo in tanks.

Front 590

Tantalum Powder

Back 590

Nodular or flake-like tantalum particles that will pass through a 20 mesh screen [850 µm (microns)] as discrete particles or as agglomerates of discrete particles.

Front 591

Tantalum Ultra Fines

Back 591

The fraction of a tantalum powder that is 10 µm (microns) or smaller in nominal diameter, either as discrete particles or as agglomerates of discrete particles.

Front 592

Tap Conductors

Back 592

As used in this article, a tap conductor is defined as a conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected as described elsewhere in 240.4.

Front 593

Tap Conductors

Back 593

As used in this standard, a tap conductor is defined as a conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected as described elsewhere in this standard. [70:240.2]

Front 594

Target Fuel

Back 594

A fuel that is subject to ignition by thermal radiation such as from a flame or a hot gas layer.

Front 595

Target Risk

Back 595

A risk that has been identified by analysis of data, has been evaluated by the authority having jurisdiction and/or stakeholders, and is to be mitigated.

Front 596

Task

Back 596

A specific job behavior or activity.

Front 597

Task

Back 597

A specific job behavior or activity. [1002, 2003]

Front 598

Task Force

Back 598

A group of resources with common communications and a leader that can be pre-established and sent to an incident or planned event or formed at an incident or planned event.

Front 599

Task Force

Back 599

Any combination of single resources assembled for a particular tactical need, with common communications and a leader.

Front 600

Task Illumination

Back 600

Provision for the minimum lighting required to carry out necessary tasks in the described areas, including safe access to supplies and equipment, and access to exits.

Front 601

Task Illumination

Back 601

Provisions for the minimum lighting required to carry out necessary tasks in the areas described in Chapter 4, including safe access to supplies and equipment and access to exits. (ELS)

Front 602

Tasks

Back 602

Specific directions given to companies for the purpose of meeting tactical-level requirements.

Front 603

Task Trained

Back 603

Instructed in the safety and health aspects and safe work procedures of the task prior to performing such tasks.

Front 604

TC

Back 604

Transport Canada.

Front 605

TC

Back 605

Transport Canada, formerly Canada Transport Commission (CTC), which has jurisdiction over high- and low-pressure cylinders and cartridges in Canada.

Front 606

TDD/TTY

Back 606

A device that is used in conjunction with a telephone to communicate with persons who are deaf, who are hard of hearing, or who have speech impairments, by typing and reading text.

Front 607

Team

Back 607

Two or more individuals who have been assigned a common task and are in communication with each other, coordinate their activities as a work group, and support the safety of one another.

Front 608

Team

Back 608

Two or more individuals who have been assigned a common task and are in communication with each other, coordinate their activities as a work group, and support the safety of one another. [1081:3.3]

Front 609

Team

Back 609

Two or more individuals who have been assigned a common task and are in proximity to and in direct communications with each other, coordinate their activities as a work group, and support the safety of one another.

Front 610

Technical Decontamination

Back 610

The planned and systematic process of reducing contamination to a level that is as low as reasonably achievable (ALARA).

Front 611

Technically Infeasible

Back 611

A change to a building that has little likelihood of being accomplished because the existing structural conditions require the removal or alteration of a load-bearing member that is an essential part of the structural frame, or because other existing physical or site constraints prohibit modification or addition of elements, spaces, or features that are in full and strict compliance that applicable requirements.

Front 612

Technically Infeasible

Back 612

A change to a building that has little likelihood of being accomplished because the existing structural conditions require the removal or alteration of a load-bearing member that is an essential part of the structural frame, or because other existing physical or site constraints prohibit modification or addition of elements, spaces, or features that are in full and strict compliance with applicable requirements.

Front 613

Technically Infeasible
(Accessibility)

Back 613

With respect to an alteration of a building or a facility, a change to a building that has little likelihood of being accomplished because existing structural conditions would require removing or altering a load-bearing member that is an essential part of the structural frame, or because other existing physical or site constraints prohibit modification or addition of elements, spaces, or features that are in full and strict compliance with the minimum requirement for alterations and that are necessary to provide accessibility.

Front 614

Technical Power System

Back 614

An electrical distribution system with grounding in accordance with
250.146(D), where the equipment grounding conductor is isolated
from the premises grounded conductor except at a single grounded
termination point within a branch-circuit panelboard, at the
originating (main breaker) branch-circuit panelboard, or at the
premises grounding electrode.

Front 615

Technical Rescue

Back 615

The application of special knowledge, skills, and equipment to safely resolve unique and/or complex rescue situations.

Front 616

Technical Rescue

Back 616

The application of special knowledge, skills, and equipment to safely resolve unique and/or complex rescue situations.
[1670, 2004]

Front 617

Technical Rescue Incident

Back 617

Complex rescue incidents requiring specially trained personnel and special equipment to complete the mission.

Front 618

Technical Rescue Incidents

Back 618

Complex rescue incidents requiring specially trained personnel and special equipment to complete the mission.

Front 619

Technical Rescue Incidents

Back 619

Those activities directed at locating endangered persons, removing endangered persons from danger, treating the injured at an emergency incident, and providing transport to an appropriate health care facility.

Front 620

Technical Rescuer

Back 620

A person who is trained to perform or direct the technical rescue.

Front 621

Technical Specialist

Back 621

A person with specialized skills, training, and/or certification who can be used anywhere within the incident management system organization where his or her skills might be required.

Front 622

Technical Specialist

Back 622

A person with specialized skills, training, and/or certification who can be used anywhere within the incident management system organization where their skills might be required.

Front 623

Technical Specialists

Back 623

Personnel with special skills who are activated only when needed.

Front 624

Technical Support Area

Back 624

The area or space within a telecommunications facility that does not contain telecommunications equipment but contains limited furniture or office-type equipment or both and that directly supports the telecommunications equipment area.

Front 625

Technician

Back 625

An individual qualified and authorized by the compliant product manufacturer to provide specified care and maintenance to the product and perform inspection, repair, and testing beyond the level classified as “user repair.”

Front 626

Telecommunications

Back 626

The transmission, receiving, switching, and management of signals, such as electrical, optical, or electromagnetic, by wire, fiber, or through the air.

Front 627

Telecommunications
Equipment

Back 627

The wire, cable, and electrical/electronic equipment including signal-processing equipment, cable entrance equipment, power equipment, main distribution frame equipment, and standby engine equipment.

Front 628

Telecommunications
Equipment Area

Back 628

The area or enclosed room of a telecommunications facility that contains telecommunications equipment.

Front 629

Telecommunications Facility

Back 629

A building or portion of a building that includes telecommunications equipment area and support areas.

Front 630

Telecommunicator

Back 630

An individual whose primary responsibility is to receive, process, or disseminate information of a public safety nature via telecommunication devices.

Front 631

Telecommunicator

Back 631

An individual whose primary responsibility is to receive, process, or disseminate information of a public safety nature via telecommunication devices. [1061, 2002]

Front 632

Telescopic

Back 632

Extended or retracted by sliding of the overlapping sections.

Front 633

Television Studio or Motion
Picture Stage (Sound Stage)

Back 633

A building or portion of a building usually insulated from the outside noise and natural light for use by the entertainment industry for the purpose of motion picture, television, or commercial production.

Front 634

Temperature

Back 634

The degree of sensible heat of a body as measured by a thermometer or similar instrument.

Front 635

Temperature Controller

Back 635

A device that measures the temperature and automatically controls the input of heat into the furnace.

Front 636

Temperature Relief Valve

Back 636

A valve that automatically opens and automatically closes a relief vent, depending on whether the temperature is above or below a predetermined value.

Front 637

Tempering Air

Back 637

Cool air added to the hot primary air or gas to modify its temperature.

Front 638

Temporary

Back 638

Any object that is in place for a period of 180 consecutive days or less.
(See also 3.3.16.) [5000, 2006]

Front 639

Temporary

Back 639

Any object that is in place for a period of 180 consecutive days or less.
(See also 3.3.607.14, Temporary Structure.)

Front 640

Temporary

Back 640

As applied to buildings or structures: a building or structure not meeting the definition for permanent structure. As applied to electrical power and wiring: electrical service in use or in place for a period of 90 consecutive calendar days or less.

Front 641

Temporary Equipment

Back 641

Portable wiring and equipment intended for use with events of a transient or temporary nature where all equipment is presumed to be removed at the conclusion of the event.

Front 642

Temporary Facilities

Back 642

Buildings or other structures that are to be in service for a limited time and have a limited exposure period for environmental loadings. [ASCE/SEI 7:1.2]

Front 643

Temporary Installation

Back 643

An installation of flame effects for which the governing use permit has a duration of 180 days or less within a twelve-month period in a single venue.

Front 644

Temporary Landing Site

Back 644

A site intended to be used for a period of less than 30 consecutive days, and for no more than 10 operations per day.

Front 645

Temporary Platform

Back 645

A platform erected within an area for not more than 30 days.

Front 646

Temporary Structure

Back 646

A building or structure not meeting the definition of permanent structure. (See also 3.3.254.8, Permanent Structure.)

Front 647

Temporary Structure

Back 647

A building or structure not meeting the definition of permanent structure. (See also 3.3.607.12, Permanent Structure.)

Front 648

Temporary Wiring

Back 648

Approved wiring for power and lighting during a period of construction, remodeling, maintenance, repair, or demolition, and decorative lighting, carnival power and lighting, and similar purposes.

Front 649

Tenable Environment

Back 649

An environment in which smoke and heat are limited or otherwise restricted to maintain the impact on occupants to a level that is not life threatening. [92B, 2005]

Front 650

Tenable Environment

Back 650

An environment in which the products of combustion, including toxic gases, particulates, and heat, are limited or otherwise restricted to maintain the impact on occupants to a level that is not life
threatening.

Front 651

Tenable Environment

Back 651

An environment in which the products of combustion, including toxic gases, particulates, and heat, are limited or otherwise restricted to maintain the impact on occupants to a level that is not life
threatening. [92B, 2009]

Front 652

Tenable Environment

Back 652

An environment that supports human life for a specific period of time.

Front 653

Tenable Environment

Back 653

In a transportation system, an environment that permits the self-rescue of occupants for a specific period of time.

Front 654

Tender

Back 654

An individual trained in the responsibilities of diver safety who provides control of search patterns from the surface of the water.

Front 655

Tensile Strength

Back 655

The force at which a fiber or fabric will break when pulled in one dimension.

Front 656

Tensile Strength

Back 656

The highest unit tensile stress (referred to the original cross section) a material can sustain before failure (psi).

Front 657

Tensioned-Membrane
Structure

Back 657

A membrane structure incorporating a membrane and a structural support system such as arches, columns and cables, or beams wherein the stresses developed in the tensioned membrane interact with those in the structural support so that the entire assembly acts together to resist the applied loads.

Front 658

Tensioned-Membrane
Structure

Back 658

A membrane structure incorporating a membrane and a structural support system such as arches, columns and cables, or beams wherein the stresses developed in the tensioned membrane interact with those in the structural support so that the entire assembly acts together to resist the applied loads. [5000, 2006]

Front 659

Tent

Back 659

A temporary structure, the covering of which is made of pliable material that achieves its support by mechanical means such as beams, columns, poles, or arches, or by rope or cables, or both.

Front 660

Tent

Back 660

A temporary structure, the covering of which is made of pliable material that achieves its support by mechanical means such as beams, columns, poles, or arches, or by rope or cables, or both. [5000, 2006]

Front 661

Terminal

Back 661

A conductive part of a device provided for electrical connection to circuits external to the device.

Front 662

Terminal

Back 662

Either end of a carrier line having facilities for the handling of freight and passengers.

Front 663

Terminal

Back 663

That portion of a property where liquids are received by tank vessel, pipelines, tank car, or tank vehicle and are stored or blended in bulk for the purpose of distributing such liquids by tank vessel, pipeline, tank car, tank vehicle, portable tank, or container.

Front 664

Terminal

Back 664

The end of a flexible hose or tubing used in a manufactured assembly where the user is intended to make connection and disconnection. (PIP)

Front 665

Terminal Operator

Back 665

The owner or other person, such as the leasee, who is responsible for the operation of the facility.

Front 666

Terminal Post

Back 666

A part provided for the connection of a cell or a battery to external conductors.

Front 667

Terminal Yard

Back 667

Open areas at a marine terminal site that are provided for the temporary storage of cargo, containers, and cargo-handling equipment.

Front 668

Termination

Back 668

That portion of incident management after the cessation of tactical operations in which personnel are involved in documenting safety procedures, site operations, hazards faced, and lessons learned from the incident.

Front 669

Termination

Back 669

That portion of incident management in which personnel are involved in documenting safety procedures, site operations, hazards faced, and lessons learned from the incident. Termination is divided into three phases: debriefing the incident, post-incident analysis, and critiquing the incident.

Front 670

Terrain

Back 670

Specific natural and topographical features within an environment.

Front 671

Terrain Hazard

Back 671

Specific terrain feature, or feature-related condition, that exposes one to danger and the potential for injury and/or death.

Front 672

Terrorist Activities

Back 672

Disruptive or violent actions taken by an organized group or individuals in order to intimidate a population group or civil authorities.

Front 673

Test

Back 673

To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of an item and comparing those characteristics with prescribed standards.

Front 674

Test

Back 674

To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of an item and comparing those characteristics with prescribed standards. [1915, 2000]

Front 675

Test Bath (Hot Tank, Water
Bath)

Back 675

A water tank in which pressurized aerosol containers are tested to verify the container strength and to detect leaks by immersion in water.

Front 676

Tested

Back 676

Verification of compliance with test requirements as specified in this standard.

Front 677

Testing

Back 677

A procedure used to determine the status of a system as intended by conducting periodic physical checks on waterbased fire protection systems such as waterflow tests, fire pump tests, alarm tests, and trip tests of dry pipe, deluge, or preaction valves. These tests follow up on the original acceptance test at intervals specified in the appropriate chapter of this standard.

Front 678

Testing

Back 678

The process by which the hazards that could confront entrants of a trench or excavation are identified and evaluated, including specifying tests that are to be performed in a trench or excavation.

Front 679

Test Pressure

Back 679

The pressure to which a system or a component of a system is subjected to verify the integrity of the system or component.

Front 680

Test Specimen

Back 680

A steel plate, thermally protected with an insulation material, exposed to the simulated gas impingement jet or torch fire.

Front 681

Test Specimen

Back 681

The exterior non-load-bearing wall assembly to be tested in accordance with this fire test method.

Front 682

Textile

Back 682

A material made of natural or man-made fibers and used for the manufacture of items such as curtains, clothing, and furniture fittings.

Front 683

Textile

Back 683

As used in this document, originally a woven fabric, now generally applied to (1) staple fibers and filaments suitable for conversion to or use as yarns or for the preparation of nonwoven fabrics, (2) yarns made from natural or manufactured fibers, and (3) fabrics made from fibers as defined in (1) and (2) and from yarns.

Front 684

Textile Fabric

Back 684

A planar structure consisting of yarns or fibers.

Front 685

Textile Fabric

Back 685

A planar structure consisting of yarns or fibers. [1977, 2005]

Front 686

Textiles

Back 686

A planar structure material consisting of yarns or fibers.

Front 687

Textual Audible Notification
Appliance

Back 687

A notification appliance that conveys a stream of audible information. An example of a textual audible notification appliance is a speaker that reproduces a voice message. (SIG-NAS)

Front 688

Textual Visible Notification
Appliance

Back 688

A notification appliance that conveys a stream of visible information that displays an alphanumeric or pictorial message. Textual visible notification appliances provide temporary text, permanent text, or symbols. Textual visible notification appliances include, but are not limited to, annunciators, monitors, CRTs, displays, and printers. (SIG-NAS)

Front 689

Theft Resistant

Back 689

Construction designed to deter illegal entry into facilities for the storage of explosive material.

Front 690

Theoretical Air

Back 690

The chemically correct quantity of air needed for complete combustion of a given quantity of a specific fuel.

Front 691

Theoretical Critical Fire Area
(TCA)

Back 691

The theoretical critical fire area (TCA) is a rectangle, the longitudinal dimension of which is the overall length of the aircraft, and the width includes the fuselage and extends beyond it by a predetermined set distance that is dependent on the overall width. Therefore, the
aircraft length multiplied by the calculated width equals the size of the TCA.

Front 692

Theoretical Critical Fire Area
(TCA)

Back 692

The theoretical critical fire area (TCA) is a rectangle, the longitudinal dimension of which is the overall length of the aircraft, and the width includes the fuselage and extends beyond it by a predetermined set distance that is dependent on the overall width. Therefore, the
aircraft length multiplied by the calculated width equals the size of the TCA. [402, 2002]

Front 693

Theoretical Heat of
Combustion

Back 693

The amount of heat released, in kJ/g (Btu/lb), when a substance is completely oxidized to yield stable end products, including water as a vapor, as measured using an oxygen bomb calorimeter. Alternatively, the theoretical heat of combustion can be calculated from heat of formation data, heat of combustion data, or molecular calculation data as reported in the literature and assuming all products are in the vapor state.

Front 694

Therapeutic High-Frequency
Diathermy Equipment

Back 694

Therapeutic high-frequency diathermy equipment is therapeutic induction and dielectric heating equipment.

Front 695

Thermal Barrier

Back 695

A material that limits the average temperature rise of an unexposed surface to not more than 250°F (121°C) for a specified fire exposure complying with the standard time-temperature curve of NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials.

Front 696

Thermal Barrier

Back 696

A material that limits the average temperature rise of an unexposed surface to not more than 250°F (139°C) for a specified fire exposure complying with the standard time-temperature curve of NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials.

Front 697

Thermal Barrier

Back 697

A material that will limit the average temperature rise of the unexposed surface to not more than 250°F (121°C) after 15 minutes of fire exposure, which complies with the standard time-temperature
curve of NFPA 251, Standard Methods of Tests of Fire Resistance of Building
Construction and Materials.

Front 698

Thermal Barrier

Back 698

The component of an element or item that principally provides thermal protection.

Front 699

Thermal Barrier

Back 699

The component of an ensemble element or item that principally provides thermal protection.

Front 700

Thermal Barrier

Back 700

A material that limits the average temperature rise of an unexposed surface to not more than 250°F (139°C) for a specified fire exposure complying with the standard time-temperature curve of NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials, or ASTM E 119, Standard Test Methods for Fire Tests of Building Construction and Materials.

Front 701

Thermal Barrier for Foam Plastic Insulation (Thermal Barrier)

Back 701

A material, product, or assembly that prevents or delays ignition of foam plastic insulation by limiting the temperature rise on the surface of the foam plastic insulation and by acting as a flame exposure
barrier to the foam plastic insulation for a 15-minute time period.

Front 702

Thermal Clearance

Back 702

The air distance between a condensed aerosol generator and any structure or components sensitive to the temperature developed by the generator.

Front 703

Thermal Expansion

Back 703

The increase in length, volume, or superficial area of a body with rise in temperature.

Front 704

Thermal Inertia

Back 704

The properties of a material that characterize its rate of surface temperature rise when exposed to heat; related to the product of the material’s thermal conductivity (k), its density (ρ), and its heat capacity (c).

Front 705

Thermally Actuated, Automatic Vent Damper Device

Back 705

An automatic vent damper device dependent for operation exclusively on the direct conversion of the thermal energy of the vent gases into mechanical energy.

Front 706

Thermally Protected (as applied to motors)

Back 706

The words Thermally Protected appearing on the nameplate of a motor or motor-compressor indicate that the motor is provided with a thermal protector.

Front 707

Thermal Oil Heating System

Back 707

A thermal oil heating system is a closed loop circulating system that heats a flammable or combustible fluid and transports it to utilization equipment for the purpose of transferring its heat to the equipment.

Front 708

Thermal Oil Used as Heat
Transfer Fluid

Back 708

An organic or synthetic fluid that is flammable or combustible and that is used as a medium to transfer heat energy from a heater or vaporizer to a remote heat consumer.

Front 709

Thermal Oxidizer

Back 709

An independently controlled, enclosed combustion system whose purpose is to destroy VOC, HC gases or vapors, or both, using elevated temperature, residence time, mixing, excess oxygen, and, in some cases, catalysts.

Front 710

Thermal Protective Clothing

Back 710

Protective clothing such as helmets, footwear, gloves, hoods, trousers, and coats that are designed and manufactured to protect the fire brigade member from the adverse effects of fire.
[600, 2005]

Front 711

Thermal Protective Clothing

Back 711

Protective clothing such as helmets, footwear, gloves, hoods, trousers, and coats that are designed and manufactured to protect the industrial fire brigade member from the adverse effects of fire.

Front 712

Thermal Protective
Performance (TPP)

Back 712

A numerical value indicating the resistance of materials to convective and radiant heat exposure.

Front 713

Thermal Protector (as applied to motors)

Back 713

A protective device for assembly as an integral part of a motor or motor-compressor that, when properly applied, protects the motor against dangerous overheating due to overload and failure to start.

Front 714

Thermal Recovery Unit

Back 714

A device or series of devices whose purpose is to reclaim only the heat content of air, vapors, gases, or fluids that are being expelled through the exhaust system and to transfer the thermal energy so reclaimed to a location whereby a useful purpose can be served.

Front 715

Thermal Resistivity

Back 715

As used in this Code, the heat transfer capability through a substance by conduction. It is the reciprocal of thermal conductivity and is designated Rho and expressed in the units °C-cm/watt.

Front 716

Thermal Response Parameter
(TRP)

Back 716

A material characteristic that gives resistance to ignition upon exposure to a prescribed heat flux.

Front 717

Thermal Spraying

Back 717

A group of welding or allied processes in which finely divided metallic or nonmetallic materials are deposited in a molten or semimolten condition to form a coating. The coating material shall be permitted to be in the form of a powder, a ceramic rod, a wire, or molten materials.

Front 718

Thermite Reaction

Back 718

The exothermic reaction between a metal and any metal oxide lower in the electromotive series.

Front 719

Thermit Welding

Back 719

A welding process that produces coalescence of metals by heating them with superheated liquid metal resulting from a chemical reaction between a metal oxide and aluminum, with or without the application of pressure. Filler metal, where used, is obtained from the liquid metal.

Front 720

Thermoplastic

Back 720

Plastic materials that soften and melt under exposure to heat and can reach a flowable state.

Front 721

Thermoplastic Material

Back 721

Plastic material capable of being repeatedly softened by heating and hardened by cooling and, that in the softened state, can be repeatedly shaped by molding or forming.

Front 722

Thermoset Material

Back 722

Plastic material that, after having been cured by heat or other means, is substantially infusible and cannot be softened and formed.

Front 723

Thermoset Plastics

Back 723

Plastic materials that are hardened into a permanent shape in the manufacturing process and are not commonly subject to softening when heated; typically form char in a fire.

Front 724

Thigh Circumference

Back 724

Lower torso garment measurement at crotch line from folded edge to folded edge, and multiplied by 2 to obtain circumference.

Front 725

Thimble

Back 725

A fixed or removable ring, tube, or lining usually located in the hole where the chimney connector or vent connector passes through a wall or enters a chimney or vent.

Front 726

Thimble

Back 726

A grooved metal reinforcement fitted snugly into an eye splice of rope to reduce chafing and to spread the tensional loads.

Front 727

Third Party

Back 727

A professional qualified as a result of training, education, and experience who can perform a compliance and hazard analysis.

Front 728

Third Party

Back 728

A professional, qualified as the result of training, education, and experience, who can perform a compliance and hazardous analysis of process equipment in accordance with this standard.

Front 729

Third Party Administrator
(TPA)

Back 729

An organization contracted by a self-insured employer to handle the administrative aspects of the employer’s plan.

Front 730

Thread Gasket

Back 730

A gasket used in a female threaded connection to provide a watertight seal between the male and female threaded connections.

Front 731

Thread Joint Compounds

Back 731

Nonhardening materials used on pipe threads to ensure a seal.

Front 732

Three-Dimensional Fire

Back 732

A liquid fuel fire that flows freely from a vertical height, falling on associated equipment or structure down to a static pooled surface fire.

Front 733

Threshold

Back 733

The beginning of that portion of the runway usable for landing.

Front 734

Throat

Back 734

The center of the footwear entrance area behind the gusset, from its top line to the lowest point where it attaches to the vamp.

Front 735

Through-Penetration

Back 735

An opening for penetrations that pass through both sides of a vertical or horizontal fire resistance-rated assembly.

Front 736

Through-Penetration

Back 736

An opening for penetrations that pass through both sides of a vertical or horizontal fire resistance-rated assembly. [5000, 2009]

Front 737

Through-Penetration Firestop

Back 737

A specific construction consisting of the materials that fill the opening around penetrating items such as cables, cable trays, conduits, ducts, and pipes and their means of support through the wall or floor opening to prevent spread of fire.

Front 738

Through Penetration Fire Stop

Back 738

A tested, fire-rated construction consisting of the materials that fill the openings through the wall or floor opening around penetrating items such as cables, cable trays, conduits, ducts, and pipes and their means of support to prevent the spread of fire.

Front 739

Through-Wall Lighting
Assembly

Back 739

A lighting assembly intended for installation above grade, on or through the wall of a pool, consisting of two interconnected groups of components separated by the pool wall.

Front 740

Throw Bag

Back 740

A water rescue system that includes 15.24 m to 22.86 m (50 ft to 75 ft) of water rescue rope, an appropriately sized bag, and a closed-cell foam float.

Front 741

Throwline

Back 741

A floating rope that is intended to be thrown to a person during water rescues or as a tether for rescuers entering the water.

Front 742

Thruster

Back 742

Controllable device used to assist in maneuvering and positioning the vessel.

Front 743

Tidal Range

Back 743

The difference in height between mean lower low water and mean higher high water or, in places having only one tide daily, between mean low water and mean high water.

Front 744

Tidal Water

Back 744

Ocean water or bodies of water that are connected to oceans that either experience a twice daily rise and fall of their surface caused by the gravitational pull of the moon or experience a corresponding ebb and flow of water in response to the tides.

Front 745

Tides

Back 745

The periodic variation in the surface depth of the oceans, and of bays, gulfs, inlets, and tidal regions of rivers, caused by the gravitational pull of the sun and moon.

Front 746

Tide Tables

Back 746

Schedule of predicted rise and fall of the surface of tidal waters above or below a mean water level at predictable times of each day of the year.

Front 747

Tie Circuit

Back 747

A circuit that connects a communications center with an alternate communications center or with a public safety answering point (PSAP).

Front 748

Tiered Stand

Back 748

Where rows of containers are placed above containers of the same or another battery.

Front 749

Tiered Storage

Back 749

An arrangement in which bales are stored directly on the floor, two or more bales high.

Front 750

Tight (suffix)

Back 750

So constructed that the specified material is excluded under specified conditions.

Front 751

Tiller Aerial Apparatus

Back 751

A tractor-trailer aerial apparatus with a steering wheel connected to the rear axle for maneuvering the rear portion of the apparatus.

Front 752

Tiller Operator

Back 752

The fire apparatus driver/operator who has met the requirements of
Chapter 7.

Front 753

Time Line

Back 753

Graphic representation of the events in a fire incident displayed in chronological order.

Front 754

Time of Discovery of Event

Back 754

The time that a third party or the patient becomes aware of the need for assistance.

Front 755

Time of Result of First
Intervention

Back 755

The time that the responder first identifies results of the first intervention. For example, when extrication occurred, when return of spontaneous circulation occurred, and so forth.

Front 756

Time to Ignition

Back 756

Time between the start of the test and the presence of a flame on or over most of the specimen surface for a period of at least 4 seconds.

Front 757

Time Unit

Back 757

A functional unit within the finance/administration section responsible for record keeping of time for personnel working an incident or planned event.

Front 758

Tip

Back 758

The end of the ladder opposite the butt end.

Front 759

Titanium

Back 759

Refers to either pure metal or alloys having the generally recognized properties of titanium metal, including the fire or explosion characteristics of titanium in its various forms.

Front 760

Titanium or Zirconium Fines

Back 760

The fraction of a titanium or zirconium 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 761

Toaster

Back 761

Equipment that is capable of producing the desired cooking, toasting, and modification of protein by means of heat and moisture.

Front 762

Toe

Back 762

The point where the trench wall meets the floor of the trench.

Front 763

Toecap

Back 763

A reinforcement to the toe area of footwear designed to protect the toes from impact and compression.

Front 764

Toilet Trap Arm

Back 764

The piping between the toilet and its vent that receives the discharge from each toilet.

Front 765

Tonnage

Back 765

A measurement of enclosed volume of a vessel inside of structural frames (1 ton = 100 ft3).

Front 766

Tool

Back 766

An abbreviation for powered rescue tool.

Front 767

Tool

Back 767

Any device, storage cabinet, workstation, or process machine used in the cleanroom.

Front 768

Tool Kit

Back 768

Equipment available to the rescuer as defined in this document.

Front 769

Top

Back 769

The intersection between the midsagittal plane and the coronal plane extended to the helmet surface.

Front 770

Top Guard

Back 770

Antipersonnel device, usually of barbed or concertina wire, installed at the tops of fences and along roof edges.

Front 771

Top Line

Back 771

The top edge of the protective footwear that includes the tongue, gusset, quarter, collar, and shaft.

Front 772

Topography

Back 772

The land surface configuration.

Front 773

Top Rail

Back 773

The top chord (rail) of an aerial ladder to which reinforcements are attached.

Front 774

Top Rail

Back 774

The top chord (rail) of an aerial ladder to which reinforcements are attached. [1901, 2003]

Front 775

Top Shield

Back 775

A grounded metal shield covering under-carpet components of the FCC system for the purposes of providing protection against physical damage.

Front 776

Torch-Applied Roofing System

Back 776

A bituminous roofing system using membranes that are adhered by heating with a torch and melting an asphalt backcoating instead of mopping hot asphalt for adhesion.

Front 777

Torch Fire

Back 777

An ignited discharge of propane vapors under pressure.

Front 778

Torque Box

Back 778

A structural component placed between the turntable and the chassis or part of the chassis frame of an aerial device to absorb the stresses of operation.

Front 779

Torque Converter

Back 779

A device that is similar to a fluid coupling but that produces, by means of additional turbine blades, variable torque multiplication.

Front 780

Torque Value

Back 780

A measure of tightness or the amount of stress that is put on a fastening device (i.e., bolt) to secure it properly.

Front 781

Total Burn

Back 781

A fire scene where a fire continued to burn until most combustibles were consumed and the fire self extinguished due to a lack of fuel or was extinguished when the fuel load was reduced by burning and there was sufficient suppression agent application to extinguish the fire.

Front 782

Total Compartment
Application System

Back 782

A system designed to discharge water mist to protect all hazards in an enclosure.

Front 783

Total Continuous Electrical
Load

Back 783

The total current required to operate all of the devices permanently connected to the apparatus that can be simultaneously energized excluding intermittent-type loads such as primers and booster reel rewind motors.

Front 784

Total Continuous Electrical
Load

Back 784

The total current required to operate all of the devices permanently connected to the apparatus that can be simultaneously energized excluding intermittent-type loads such as primers and booster reel rewind motors. [1901, 2003]

Front 785

Total Discharge Head (hd)

Back 785

See 3.3.23.2.

Front 786

Total Discharge Head (hd)

Back 786

The reading of a pressure gauge at the discharge of the pump, converted to meters (feet) of liquid, and referred to datum, plus the velocity head at the point of gauge attachment.

Front 787

Total Fire Load

Back 787

The total heat energy of all combustibles available from the constituent materials of a certain fuel package (units: joules or Btu). This can include a transit and/or passenger rail vehicle(s), luggage, fuel, and/or wayside facilities or structures.

Front 788

Total Flooding

Back 788

The act and manner of discharging an agent for the purpose of achieving a specified minimum agent concentration throughout a hazard volume.

Front 789

Total Flooding Extinguishing
System

Back 789

A system arranged to discharge an extinguishant into an enclosed space to achieve a uniform distribution of that extinguishant, at or above the design application density, throughout the space.

Front 790

Total Flooding System

Back 790

A supply of dry chemical permanently connected to fixed piping and nozzles that are arranged to discharge dry chemical into an enclosure surrounding the hazard.

Front 791

Total Flooding System

Back 791

A system consisting of an agent supply and distribution network designed to achieve a total flooding condition in a hazard volume.

Front 792

Total Flooding System

Back 792

A system consisting of a supply of carbon dioxide arranged to discharge into, and fill to the proper concentration, an enclosed space or enclosure around the hazard.

Front 793

Total Flux Meter

Back 793

The instrument used to measure the level of radiant heat energy incident on the specimen plane at any point.

Front 794

Total Hazard Current

Back 794

The hazard current of a given isolated system with all devices, including the line isolation monitor, connected. (ELS)

Front 795

Total Head (H), Horizontal
Pumps

Back 795

The measure of the work increase, per kilogram (pound) of liquid, imparted to the liquid by the pump, and therefore the algebraic difference between the total discharge head and the total suction head. Total head, as determined on test where suction lift exists, is the sum of the total discharge head and total suction lift. Where positive suction head exists, the total head is the total discharge head minus the total suction head.

Front 796

Total Head (H), Vertical
Turbine Pumps

Back 796

The distance from the pumping liquid level to the center of the discharge gauge plus the total discharge head.

Front 797

Total Input Rating

Back 797

The sum of the maximum Btu rating, as marked on the appliance by the manufacturer, of all appliances, not the nozzle sizes or actual firing rates.

Front 798

Totally Enclosed Fan-Cooled
Motor

Back 798

A totally enclosed motor equipped for exterior cooling by means of a fan or fans integral with the motor but external to the enclosing parts.

Front 799

Totally Enclosed Motor

Back 799

A motor enclosed so as to prevent the free exchange of air between the inside and the outside of the case but not sufficiently enclosed to be termed airtight.

Front 800

Totally Enclosed
Nonventilated Motor

Back 800

A totally enclosed motor that is not equipped for cooling by means external to the enclosing parts.

Front 801

Total Quality Management
(TQM)

Back 801

A management system fostering continuously improving performance at every level of function and focusing on customer satisfaction.

Front 802

Total Rated Head

Back 802

The total head developed at rated capacity and rated speed for either a horizontal split-case or a vertical shaft turbine-type pump.

Front 803

Total Suction Head

Back 803

Suction head exists where the total suction head is above atmospheric pressure. Total suction head, as determined on test, is the reading of a gauge at the suction of the pump, converted to meters (feet) of
liquid, and referred to datum, plus the velocity head at the point of gauge attachment.

Front 804

Total Suction Head (hs)

Back 804

Suction head exists where the total suction head is above atmospheric pressure. Total suction head, as determined on test, is the reading of a gauge at the suction of the pump, converted to meters (feet) of
liquid, and referred to datum, plus the velocity head at the point of guage attachment.

Front 805

Total Suction Lift (hl)

Back 805

Suction lift that exists where the total suction head is below atmospheric pressure. Total suction lift, as determined on test, is the reading of a liquid manometer at the suction nozzle of the pump, converted to meters (feet) of liquid, and referred to datum, minus the velocity head at the point of gauge attachment.

Front 806

Touch Potential

Back 806

A ground potential gradient difference that can cause current flow from hand to hand, hand to foot, or another path, other than foot to foot, through the body.

Front 807

Touring Production

Back 807

Any production performed in more than one geographic location.

Front 808

Tourist, Scenic, Historic, or
Excursion Operations

Back 808

Railroad operations that carry passengers, often using antiquated equipment, with the conveyance of the passengers to a particular destination not being the principal purpose.

Front 809

Towboat

Back 809

A powerful, small vessel designed for pushing larger vessels.

Front 810

Tower

Back 810

An enclosed independent structure or portion of a building with elevated levels for support of equipment or occupied for observation, control, operation, signaling, or similar limited use.

Front 811

Townhouse

Back 811

A one-family dwelling constructed in attached groups of three or more units in which each unit extends from the foundation to the roof and has open space on at least two sides.

Front 812

Tow Vehicle

Back 812

A motor vehicle used to tow a trailer under emergency response conditions whether the tow vehicle-trailer combination is designed to remain together as a single unit or to be separated at the incident to allow the trailer to be used independently of the tow vehicle.

Front 813

Toxic

Back 813

A property of any chemical that has the capacity to produce injury to workers, which is dependent on concentration, rate, and method and site of absorption.

Front 814

Toxic Gas

Back 814

A gas with a median lethal concentration (LC50) in air of more than 200 ppm, but not more than 2000 ppm by volume of gas or vapor, or more than 2 mg/L, but not more than 20 mg/L 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 815

Toxic Gas

Back 815

A gas with a median lethal concentration (LC50) in air of more than 200 ppm, but not more than 2000 ppm by volume of gas or vapor, or more than 2 mg/L, but not more than 20 mg/L 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 816

Toxic Industrial Chemicals

Back 816

Highly toxic solid, liquid, or gaseous chemicals that have been identified as mass casualty threats that could be used as weapons of terrorism to inflict casualties, generally on a civilian population, during a terrorist attack. [See also 3.3.16, Chemical Terrorism Agents, and 3.3.17, Chemical Warfare (CW) Agents.]

Front 817

Toxic Industrial Chemicals

Back 817

Highly toxic solid, liquid, or gaseous chemicals that have been identified as mass casualty threats that could be used to inflict casualties, generally on a civilian population, during a terrorist attack.

Front 818

Toxicity

Back 818

The degree to which a substance is harmful to humans.

Front 819

Toxic Material

Back 819

A material that produces a lethal dose or a lethal concentration within any of the following categories: (1) a chemical or substance that has a median lethal dose (LD50) of more than 50 mg/kg but not more than
500 mg/kg of body weight when administered orally to albino rats
weighing between 200 g and 300 g each; (2) a chemical or substance
that has a median lethal dose (LD50) of more than 200 mg/kg but not more than 1000 mg/kg 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
or substance that has a median lethal concentration (LC50) in air of more than 200 parts per million but not more than 2000 parts per million by volume of gas or vapor, or more than 2 mg/L but not more
than 20 mg/L, 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 820

Toxic Material

Back 820

A material that produces a lethal dose or a lethal concentration within any of the following categories: (1) a chemical or substance that has a median lethal dose (LD50) of more than 50 mg/kg but not more than
500 mg/kg of body weight when administered orally to albino rats
weighing between 200 g and 300 g each; (2) a chemical or substance
that has a median lethal dose (LD50) of more than 200 mg/kg but not more than 1000 mg/kg 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
or substance that has a median lethal concentration (LC50) in air of more than 200 parts per million but not more than 2000 parts per million by volume of gas or vapor, or more than 2 mg/L but not more
than 20 mg/L, 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 821

Toxic Material

Back 821

Any material that may constitute a hazard to life or health, either temporary or permanent, from exposure by contact, inhalation, or ingestion.

Front 822

Toxic Materials, Gases, or
Vapors

Back 822

Any substance whose properties contain the inherent capacity to produce injury to a biological system.

Front 823

Toxic Materials, Gases, or
Vapors

Back 823

Any substance whose properties contain the inherent capacity to produce injury to a biological system, which is dependent on exposure, concentration, rate, method, and area of absorption.

Front 824

Trace Number

Back 824

A code that can be used to retrieve the production history of a product (e.g., a lot or serial number).

Front 825

Tracheotomy Tube

Back 825

A curved tube for insertion into the trachea (windpipe) below the larynx (voice box) during the performance of an appropriate operative procedure (tracheotomy). (GAS)

Front 826

Track Brackets (Sliding Doors)

Back 826

Hardware bolted to the wall that serves to support the track.

Front 827

Track Clean-Up Personnel

Back 827

Personnel whose primary responsibility is to keep the racing surface in proper condition for racing; sometimes called track restoration personnel.

Front 828

Track Emergency Medical
Personnel

Back 828

Personnel assigned to emergency medical duties on and adjacent to the competition area who respond by ambulance, safety vehicles, other vehicles, or on foot and whose training levels range from first responder to medical doctor.

Front 829

Track Fire Fighter

Back 829

A fire fighter primarily responsible for competition area fire suppression activities and possibly extrication efforts.

Front 830

Traditional Sheeting and
Shoring

Back 830

The use of 1.22 m × 2.44 m (4 ft × 8 ft) sheet panels, with a strongback attachment, supplemented by a variety of conventional shoring
options such as hydraulic, screw, and/or pneumatic shores. [1670,
2004]

Front 831

Traditional Sheeting and
Shoring

Back 831

The use of 1.2 m × 2.4 m (4 ft × 8 ft) sheet panels, with a strongback attachment, supplemented by a variety of conventional shoring options such as hydraulic, screw, and/or pneumatic shores.

Front 832

Traffic Control

Back 832

The direction or management of vehicle traffic such that scene safety is maintained and rescue operations can proceed without interruption.

Front 833

Traffic Control Devices

Back 833

Ancillary equipment/resources used at the rescue scene to facilitate traffic control such as flares, barricades, traffic cones, or barrier tape.

Front 834

Traffic Incident

Back 834

An emergency road user occurrence, a natural disaster, or other unplanned event that affects or impedes the normal flow of traffic.

Front 835

Trailer

Back 835

A vehicle designed to be pulled by a tow vehicle and used to transport equipment or other vehicles under emergency response conditions.

Front 836

Trained

Back 836

A person who has become proficient in performing a skill reliably and safely through instruction and practice/field experience acceptable to the AHJ.

Front 837

Trained

Back 837

One who has undergone the instructions necessary to safely design, install, and reliably perform the maintenance and recharge service in accordance with the manufacturer’s listed manual.

Front 838

Trained

Back 838

One who has undergone the instructions necessary to safely design, install, and reliably perform the maintenance and recharge service in accordance with the manufacturer’s listed manual. [17, 2009]

Front 839

Trainer

Back 839

A person responsible for the care and training of animals.

Front 840

Training

Back 840

The process of achieving proficiency through instruction and hands-on practice in the operation of equipment and systems that are expected to be used in the performance of assigned duties.
[600, 2005]

Front 841

Training

Back 841

The process of achieving proficiency through instruction and hands-on practice in the operation of equipment and systems that are expected to be used in the performance of assigned response duties.

Front 842

Training Officer

Back 842

The person designated by the fire chief with authority for overall management and control of the organization’s training program.

Front 843

Trainway

Back 843

That portion of the guideway in which the rail vehicles operate.

Front 844

Transceiver

Back 844

A combined transmitter and receiver radio unit.

Front 845

Transfer Area

Back 845

The portion of a liquefied natural gas (LNG) plant containing a piping system where LNG, flammable liquids, or flammable refrigerants are introduced into or removed from the plant or where piping connections are connected or disconnected routinely.

Front 846

Transfer Device

Back 846

Equipment used to package and allow removal of a victim from a specific rescue environment.

Front 847

Transfer Device

Back 847

Various devices, including litters and harnesses, used with rope rescue systems to package and allow safe removal of a subject from a specific rescue environment.

Front 848

Transfer of Care

Back 848

The time that responsibility for treatment was transferred from a prehospital provider to another — when the hospital personnel physically take over care of the patient.

Front 849

Transfer of Command

Back 849

The formal procedure for transferring the duties of an Incident
Commander at an incident scene.

Front 850

Transfer Pump

Back 850

A water pump mounted on the apparatus that is used to transfer water to and from the fire apparatus.

Front 851

Transformer

Back 851

A device for changing energy in an alternating current system from one voltage to another; usually includes two or more insulated coils on an iron core.

Front 852

Transformer

Back 852

A device that, when used, raises or lowers the voltage of alternating current of the original source.

Front 853

Transformer

Back 853

An individual transformer, single- or polyphase, identified by a single nameplate, unless otherwise indicated in this article.

Front 854

Transient

Back 854

A subcycle disturbance in the ac waveform that is evidenced by a sharp, brief discontinuity of the waveform. It can be of either polarity and can be additive to, or subtractive from, the nominal waveform.

Front 855

Transient Lodging
(Accessibility)

Back 855

A building or facility containing one or more guest rooms for sleeping that provides accommodations that are intended primarily for
short-term use, not including residential dwelling units intended to be used as a residence, inpatient medical care facilities, licensed
long-term care facilities, detention or correctional facilities, private buildings or facilities that contain not more than five rooms for rent or hire, and that are actually occupied by the proprietor as the proprietor’s residence.

Front 856

Transients

Back 856

Transients (formerly referred to as surges, spikes, or impulses) are
very short duration, high amplitude excursions outside of the limits of
the normal voltage and current waveform. Waveshapes of the
excursions are usually unidirectional pulses or decaying amplitude,
high frequency oscillations. Durations range from fractions of a
microsecond to milliseconds, and the maximum duration is in the
order of one half-cycle of the power frequency. Instantaneous
amplitudes of voltage transients can reach thousands of volts.

Front 857

Transient Voltage Surge
Suppressor (TVSS)

Back 857

A protective device for limiting transient voltages by diverting or limiting surge current; it also prevents continued flow of follow current while remaining capable of repeating these functions.

Front 858

Transition Assembly

Back 858

An assembly to facilitate connection of the FCC system to other wiring systems, incorporating (1) a means of electrical interconnection and (2) a suitable box or covering for providing electrical safety and protection against physical damage.

Front 859

Transition Joint

Back 859

A connector fabricated of two or more metals used to effectively join piping sections of two different materials that are not amenable to the usual welding or joining techniques.

Front 860

Transition Plate (Accessibility)

Back 860

A sloping pedestrian walking surface located at the end(s) of a gangway.

Front 861

Transition Zone

Back 861

The layer between the smoke layer interface and the first indication of smoke in which the smoke layer temperature decreases to ambient.

Front 862

Transit Shed

Back 862

A transload facility for cargoes usually located on a pier or wharf and primarily used for transfer of breakbulk-type cargo.

Front 863

Transload Facility

Back 863

A building or structure used for loading and unloading cargo from containers, trucks, railcars, and vessels; the classification and consolidation of commodities; and the temporary storage of commodities, such as a transit shed or container freight station.

Front 864

Transmission Channel

Back 864

A circuit or path connecting transmitters to supervising stations or subsidiary stations on which signals are carried. (SIG-SSS)

Front 865

Transmitter

Back 865

A system component that provides an interface between signaling line circuits, initiating device circuits, or control units and the
transmission channel. (SIG-SSS)

Front 866

Transom

Back 866

An opening in a fire door frame above the door opening that is filled by a solid panel or with glazing material.

Front 867

Transom and Side Light
Frame

Back 867

A fire door frame prepared for the application of a glazing material above and alongside the door opening.

Front 868

Transom and Side Panel
Frame

Back 868

A fire door frame prepared for the application of solid metal or wood panels above and alongside the door opening.

Front 869

Transom Light Frame

Back 869

A fire door frame prepared for the application of a glazing material above the door opening that has a horizontal member such as a transom bar provided to separate the glazed opening from the door opening.

Front 870

Transom Panel

Back 870

A panel, fixed or removable, installed in a frame above the door.

Front 871

Transom Panel Frame

Back 871

A fire door frame prepared for the application of a transom panel above the door opening that has a horizontal member such as a transom bar provided to separate the transom opening from the door opening unless the transom panel or the bottom of the panel and the top of the door are rabbetted.

Front 872

Transponder

Back 872

A multiplex alarm transmission system functional assembly located at the protected premises. (SIG-SSS)

Front 873

Transport

Back 873

The movement of either the heat-energy source or the fuel.

Front 874

Transportable

Back 874

X-ray equipment that is to be installed in a vehicle or that may be readily disassembled for transport in a vehicle.

Front 875

Transport Air

Back 875

Air or inert gas that is used to convey pulverized fuel.

Front 876

Transport Air (in a Fluidized
Bed)

Back 876

The air used to convey or inject solid fuel or sorbent or to recycle material.

Front 877

Transport Canada (TC)

Back 877

Has jurisdiction over design and transportation of compressed gas cylinders and cartridges.

Front 878

Transport Refrigerated Unit
(TRU)

Back 878

A trailer or container, with integrated cooling or heating, or both, used for the purpose of maintaining the desired environment of temperature-sensitive goods or products.

Front 879

Transverse Flue Space

Back 879

The space between rows of storage parallel to the direction of loading.
(See Figure A.3.9.3.6.)

Front 880

Transverse Mode Noise

Back 880

Undesirable electrical signals that exist between a pair of circuit conductors. These signals are sometimes referred to as normal or differential mode noise.

Front 881

Trap

Back 881

A cuplike or U-shaped configuration located on the inside of a duct system component where liquids can accumulate.

Front 882

Trap

Back 882

A fitting or device designed and constructed to provide a liquid seal that will prevent the back passage of air without materially affecting the flow of liquid waste through it.

Front 883

Trap Arm

Back 883

That portion of a fixture drain between a trap and its vent.

Front 884

Trap Seal

Back 884

The vertical depth of liquid that a trap will retain.

Front 885

Travel Distance

Back 885

The actual walking distance from any point to the nearest fire extinguisher fulfilling hazard requirements.

Front 886

Traveling Grate Stoker

Back 886

A stoker similar to a chain grate stoker with the exception that the grate is separate from but is supported on and driven by chains.

Front 887

Travel Trailer

Back 887

A vehicular unit, mounted on wheels, designed to provide temporary living quarters for recreational, camping, or travel use, of such size or weight as not to require special highway movement permits when towed by a motorized vehicle, and a gross trailer area less than 320 ft2 (29.7 m2). [1192, 2008] (See also 3.3.19, Recreational Vehicle.)

Front 888

Travel Trailer

Back 888

A vehicular unit, mounted on wheels, designed to provide temporary living quarters for recreational, camping, or travel use, of such size or weight as not to require special highway movement permits when towed by a motorized vehicle, and of gross trailer area less than 30 m2 (320 ft2). (See Recreational Vehicle.)

Front 889

Treatment System

Back 889

An assembly of equipment capable of processing a hazardous gas and reducing the gas concentration to a predetermined level at the point of discharge from the system to the atmosphere.

Front 890

Treatment System

Back 890

An assembly of equipment capable of processing a hazardous gas and reducing the gas concentration to a predetermined level at the point of discharge from the system to the atmosphere. [55, 2005]

Front 891

Trench Box (or Trench
Shield)

Back 891

A manufactured protection system unit made from steel, fiberglass, or aluminum that is placed in a trench to protect workers from cave-in and that can be moved as a unit. [See also 3.3.121, Shield (or Shield System).]

Front 892

Trench/Cave-In Rescue

Back 892

The activity of rescue during the collapse or cave-in of a trench. A
trench is deeper than it is wide.

Front 893

Trench Emergency

Back 893

Any failure of hazard control or monitoring equipment or other event(s) inside or outside a trench or excavation that could endanger entrants within the trench or excavation.

Front 894

Trench Floor

Back 894

The bottom of the trench.

Front 895

Trench (or Trench
Excavation)

Back 895

A narrow (in relation to its length) excavation made below the surface of the earth.

Front 896

Trench (Trench Excavation)

Back 896

An excavation, narrow in relation to its length, made below the surface of the earth.

Front 897

Trench Upright

Back 897

A vertical support member that spans the distance between the toe of the trench and the trench lip to collect and distribute the tension from the opposing wall over a large area.

Front 898

Triage

Back 898

The sorting of casualties at an emergency according to the nature and severity of their injuries.

Front 899

Triage

Back 899

The sorting of casualties at an emergency according to the nature and severity of their injuries. [402, 2008]

Front 900

Triage Tag

Back 900

A tag used in the classification of casualties according to the nature and severity of their injuries.

Front 901

Triage Tag

Back 901

A tag used in the classification of casualties according to the nature and severity of their injuries. [402, 2008]

Front 902

Trial for Ignition Period

Back 902

The interval of time during which main burner fuel is permitted to be delivered into the ignition zone before the flame-sensing device is required to detect flame. (See 3.3.38, Main Burner Flame Establishing Period, and 3.3.46, Pilot Flame Establishing Period.)

Front 903

Trial-for-Ignition Period
(Flame-Establishing Period)

Back 903

The interval of time during light-off that a safety control circuit allows the fuel safety shutoff valve to remain open before the combustion safeguard is required to supervise the flame.

Front 904

Trial-for-Ignition Period
(Igniter)

Back 904

The interval of time during light-off in which a safety control circuit permits the igniter fuel safety shutoff valve(s) to be opened before the flame detection system is required to supervise the igniter flame.

Front 905

Trial-for-Ignition Period (Main
Burner)

Back 905

The interval of time during light-off in which a safety control circuit permits the main burner fuel safety shutoff valve(s) to be opened before the flame detection system is required to supervise the main burner flame only.

Front 906

Trickling Filter

Back 906

A treatment unit process consisting of stone, plastic, redwood, or similar media over which wastewater is distributed and through which wastewater trickles to the underdrains and is treated by the microbial slimes formed on the surface of the media.

Front 907

Trim

Back 907

Material attached to the exterior surface of protective clothing or equipment to enhance visibility. Retroreflective materials enhance night time visibility, and fluorescent materials enhance daytime visibility.

Front 908

Trim

Back 908

(1) The longitudinal angle of a vessel. (2) The relation of the vessel’s floating attitude to the water considered from front to back. (3) The difference between fore and aft draft readings. (4) To cause a vessel to assume a desirable position in the water by arrangement of ballast, cargo, or passengers.

Front 909

Trim

Back 909

Retroreflective and fluorescent materials attached to the outermost surface of the protective ensemble for visibility enhancement. Retroreflective materials enhance nighttime visibility, and fluorescent materials enhance daytime visibility. “Trim” is also known as “visibility markings.”

Front 910

Trimmer

Back 910

Where referring to chimneys, the longer floor or roof framing member around a rectangular opening into which the end of a header is joined.

Front 911

Trip-Free Circuit Breaker

Back 911

A resettable overcurrent protection device designed so that the means of resetting cannot override the current interrupting mechanism.

Front 912

Trouble Signal

Back 912

A signal initiated by a dispatch system or device indicative of a fault in a monitored circuit or component.

Front 913

Trouble Signal

Back 913

A signal initiated by a system or device indicative of a fault in a monitored circuit, system, or component. [72, 2007]

Front 914

Trouble Signal

Back 914

A signal initiated by the fire alarm system or device indicative of a fault in a monitored circuit or component. [72, 2007]

Front 915

Trouble Signal

Back 915

A signal initiated by a system or device indicative of a fault in a monitored circuit, system, or component. (SIG-FUN)

Front 916

Trouble Signals

Back 916

A signal indicating a fault in a monitored circuit or component.

Front 917

Trouser

Back 917

A garment that is designed to provide minimum protection to the lower torso and legs, excluding the ankles and feet.

Front 918

Truck

Back 918

A common fire service term for aerial fire apparatus.

Front 919

Truck

Back 919

A motor vehicle designed for the transportation of goods, services, and equipment.

Front 920

Truck Camper

Back 920

A portable unit constructed to provide temporary living quarters for recreational, travel, or camping use, consisting of a roof, floor, and sides, and is designed to be loaded onto and unloaded from the bed of a pickup truck. [1192, 2008] (See also 3.3.19, Recreational Vehicle.)

Front 921

Truck Camper

Back 921

A portable unit constructed to provide temporary living quarters for recreational, travel, or camping use, consisting of a roof, floor, and sides, designed to be loaded onto and unloaded from the bed of a pickup truck. (See Recreational Vehicle.)

Front 922

Truck Company

Back 922

A group of fire fighters who work as a unit and are equipped with one or more pieces of aerial fire apparatus.

Front 923

Truck Coupler

Back 923

A truck flanged surface inlet and mating cord connector.

Front 924

Truck Flanged Surface Inlet

Back 924

The device(s) on the truck into which the connector(s) is inserted to provide electric energy and other services. This device is part of the truck coupler. For the purposes of this article, the truck flanged surface inlet is considered to be part of the truck and not part of the electrified truck parking space supply equipment.

Front 925

Trunk

Back 925

A vertical shaft or duct used for the passage of pipes, wires, ladders, and other devices.

Front 926

Trunked Radio

Back 926

A radio system that uses computer control to automatically assign channels from an available pool of channels to users and groups of users.

Front 927

Trunk Sewer

Back 927

A sewer consisting of the principal pipe or conduit to which one or more collector sewers or branch sewers are tributaries; also called main sewer.

Front 928

Trunnion Shaft (Spider and
Trunnion)

Back 928

A shaft that supports the rotating cylinder.

Front 929

Trussed-Lattice-Type Boom
Section

Back 929

An open truss boom framework with vertical and diagonal braces that are fastened to horizontal beams of the frame.

Front 930

t-Squared (t2) Fire

Back 930

A fire that has a heat release rate that grows proportionally to the square of time from ignition. [See Annex C for further information on t-squared (t2) profile fires.]

Front 931

TTY (Accessibility)

Back 931

The abbreviation for teletypewriter, machinery that employs interactive text-based communication through the transmission of coded signals across the telephone network, which can include, for example, devices known as TDDs (telecommunication display devices or telecommunication devices for deaf persons) or computers with special modems; also known as text telephones.

Front 932

Tube Trailer

Back 932

A truck or semi trailer on which a number of very long compressed gas tubular cylinders have been mounted and manifolded into a common piping system.

Front 933

Tubing

Back 933

Semirigid conduit of copper, steel, aluminum, corrugated stainless steel tubing (CSST), or plastic.

Front 934

Tubing

Back 934

Semirigid conduit of copper, steel, aluminum, CSST, or plastic. [54,
2002]

Front 935

Tubular Heating System

Back 935

A radiant heating system in which resistive conductors are enclosed in glass, quartz, or ceramic envelopes that can contain a special gas atmosphere.

Front 936

Tufted

Back 936

Buttoned or laced through the upholstery cover material and through the upholstery material.

Front 937

Tug

Back 937

A powerful, small vessel designed for towing larger vessels.

Front 938

Tunnel

Back 938

An underground structure with a design length over 23 m (75 ft) and a 1800 mm (6 ft) diameter.

Front 939

Turboprop Aircraft

Back 939

An aircraft powered by one or more turbine engines each of which drives a propeller.

Front 940

Turning Clearance Radius

Back 940

One-half the larger of the left or right full circle wall-to-wall turning diameter.

Front 941

Turning Clearance Radius

Back 941

One-half the larger of the left or right full circle wall-to-wall turning diameter. [1901, 2003]

Front 942

Turnout Activation

Back 942

Personnel preparation, boarding the vehicle, starting the vehicle, placing the vehicle in gear, and moving the vehicle toward the emergency scene.

Front 943

Turnout Interval

Back 943

The time beginning when units acknowledge notification of the emergency to the beginning point of response time. [1710, 2004]

Front 944

Turnout Time

Back 944

The time beginning when units acknowledge notification of the emergency to the beginning point of response time.

Front 945

Turntable

Back 945

A structural component that connects the aerial device to the chassis and stabilization system through a rotating bearing that permits
360-degree continuous rotation of the aerial device.

Front 946

Turntable

Back 946

A structural component that connects the aerial device to the chassis and stabilization system through a rotating bearing that permits
360-degree continuous rotation of the aerial device. [1901, 2003]

Front 947

Turntable Alignment Indicator

Back 947

An indicator that facilitates alignment of the aerial device with the boom support for bedding purposes.

Front 948

Turret

Back 948

A vehicle-mounted master stream appliance.

Front 949

Tuyeres

Back 949

Forms of grates, located adjacent to a retort, feeders, or grate seals through which air is introduced.

Front 950

Tween Decks

Back 950

Cargo decks between the main deck and the lower hold.

Front 951

Twenty-Five Percent Drainage
Time

Back 951

The time in minutes that it takes for 25 percent of the total liquid contained in the foam collected in a specified manner to drain.

Front 952

Twin-Fluid System

Back 952

A water mist system in which water and atomizing media are separately supplied to and mixed at the water mist nozzle.

Front 953

Twist

Back 953

The degree of rotational movement from a given position.

Front 954

Twist

Back 954

The number of revolutions the free end of a 50 ft (15 m) length of hose rotates when it is pressurized from an initial pressure at 10 psi (6.9 kPa) to its proof test pressure with one end held stationary and the other end allowed to move freely.

Front 955

Two-Family Dwelling

Back 955

A building that consists solely of two dwelling units.

Front 956

Two-Family Dwelling Unit

Back 956

A building that consists solely of two dwelling units with independent cooking and bathroom facilities.

Front 957

Two-Fer

Back 957

An adapter cable containing one male plug and two female cord connectors used to connect two loads to one branch circuit.

Front 958

2 psi Regulator System

Back 958

An LP-Gas vapor delivery system that combines a first-stage regulator, a 2 psi (14 kPag) service regulator, and a line pressure regulator(s).

Front 959

2 psi Service Regulator

Back 959

A pressure regulator for LP-Gas vapor service designed to reduce first-stage regulator outlet pressure to a nominal 2 psig (14 kPag).

Front 960

Two-Stage Regulator System

Back 960

An LP-Gas vapor delivery system that combines a first-stage regulator and a second-stage regulator(s), or utilizes a separate integral
two-stage regulator.

Front 961

Type 1

Back 961

Low-speed primary crushers, such as jaw and roll crushers.

Front 962

Type 1 Clothes Dryer

Back 962

A factory-built, mass-produced dryer, primarily used in a family living environment. It might or might not be coin-operated for public use and usually is the smallest unit both physically and in function.

Front 963

Type 1 Clothes Dryer

Back 963

Primarily used in family living environment. May or may not be coin-operated for public use.

Front 964

Type 1 Stair

Back 964

A fully enclosed stair that serves all levels of a vessel in which persons can be employed.

Front 965

Type 2

Back 965

High-speed primary crushers, such as disk and hammer mills, pulverizers, and fine grinding equipment of all kinds, except Type 4, having a net internal volume of not more than 500 in.3 (8193 cm3).

Front 966

Type 2 Clothes Dryer

Back 966

A factory-built, mass-produced dryer used in a commercial business. It might or might not be operated by the public or a hired attendant. It might or might not be coin-operated and is not designed for use in an individual family living environment. It can be small, medium, or
large in size.

Front 967

Type 2 Clothes Dryer

Back 967

Used in business with direct intercourse of the function with the public. May or may not be operated by public or hired attendant. May or may not be coin-operated.

Front 968

Type 3

Back 968

Crushers and pulverizers of the Type 2 category, but having an internal volume of more than 500 in.3 (8193 cm3).

Front 969

Type 4

Back 969

Pulverizers that do not depend on moving parts for their disintegrating action, such as attrition mills.

Front 970

Type 4 Rating

Back 970

A rating for electrical equipment that is intended for outdoor use because it provides a degree of protection from falling rain, splashing water, and hose-directed water.

Front 971

Type A FIBC

Back 971

A standard insulating flexible intermediate bulk container (FIBC).

Front 972

Type A FIBC

Back 972

A standard insulating flexible intermediate bulk container
(FIBC).[654, 2006]

Front 973

Type A Public Fire Alarm
Reporting System

Back 973

A system in which an alarm from a fire alarm box is received and is retransmitted to fire stations either manually or automatically.
(SIG-PRS)

Front 974

Type B FIBC

Back 974

A flexible intermediate bulk container (FIBC) where the fabric or the combination of the fabric shell, coating, and any loose liner has a breakdown voltage of less than 6000 volts.

Front 975

Type B FIBC

Back 975

A flexible intermediate bulk container (FIBC) where the fabric or the combination of the fabric shell, coating, and any loose liner has a breakdown voltage of less than 6000 volts. [654, 2006]

Front 976

Type B Gas Vent

Back 976

A vent for venting listed gas appliances with draft hoods and other
Category I appliances listed for use with Type B gas vents.

Front 977

Type B Gas Vent

Back 977

A vertical or nearly vertical gas vent for venting listed gas appliances with draft hoods and other Category I gas appliances listed for use with Type B gas vents.

Front 978

Type B Public Fire Alarm
Reporting System

Back 978

A system in which an alarm from a fire alarm box is automatically transmitted to fire stations and, if used, is transmitted to supplementary alerting devices. (SIG-PRS)

Front 979

Type B-W Gas Vent

Back 979

A vent for venting listed wall furnaces.

Front 980

Type BW Gas Vent

Back 980

A vertical or nearly vertical gas vent for venting listed gas-fired vented wall furnaces.

Front 981

Type C FIBC

Back 981

A flexible intermediate bulk container (FIBC) where the fabric is interwoven with an electrically interconnected conductive fiber and provided with a tab for connection to grounding systems.

Front 982

Type C FIBC

Back 982

A flexible intermediate bulk container (FIBC) where the fabric is interwoven with an electrically interconnected conductive fiber and provided with a tab for connection to grounding systems.
[654, 2006]

Front 983

Type Designation

Back 983

A system for identifying types of powered industrial trucks for operation in nonclassified and classified areas.

Front 984

Type Designation CN

Back 984

A compressed natural gas-powered unit that has minimum acceptable safeguards against inherent fire hazards.

Front 985

Type Designation CNS

Back 985

A compressed natural gas-powered unit that, in addition to meeting the requirements for Type CN units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 986

Type Designation D

Back 986

A diesel-powered unit that has minimum acceptable safeguards against inherent fire hazards.

Front 987

Type Designation DS

Back 987

A diesel-powered unit that, in addition to meeting all the requirements for Type D units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 988

Type Designation DX

Back 988

A diesel-powered unit in which the diesel engine and the electric fittings and equipment are so designed, constructed, and assembled that the unit can be used in atmospheres that contain specifically named flammable vapors, dusts, and, under certain conditions, fibers.

Front 989

Type Designation DY

Back 989

A diesel-powered unit that has all the safeguards of Type DS units and, in addition, any electric equipment is completely enclosed and equipped with temperature-limitation features.

Front 990

Type Designation E

Back 990

An electrically powered unit that has minimum acceptable safeguards against inherent fire and electrical shock hazards.

Front 991

Type Designation EE

Back 991

An electrically powered unit that, in addition to meeting all the requirements for Type E and ES units, has its electric motors and all other electric equipment completely enclosed.

Front 992

Type Designation ES

Back 992

An electrically powered unit that, in addition to meeting all the requirements for Type E units, is provided with additional safeguards to the electric system to prevent the emission of hazardous sparks and to limit surface temperatures.

Front 993

Type Designation EX

Back 993

An electrically powered unit in which the electric fittings and equipment are so designed, constructed, and assembled that the unit can be used in atmospheres containing specifically named flammable vapors, dusts, and, under certain conditions, fibers.

Front 994

Type Designation G

Back 994

A gasoline-powered unit that has minimum acceptable safeguards against inherent fire hazards.

Front 995

Type Designation G/CN

Back 995

A unit that operates on either gasoline or compressed natural gas that has minimum acceptable safeguards against inherent fire hazards.

Front 996

Type Designation G/LP

Back 996

A unit that operates on either gasoline or liquefied petroleum gas and that has minimum acceptable safeguards against inherent fire
hazards.

Front 997

Type Designation GS

Back 997

A gasoline-powered unit that, in addition to meeting all the requirements for Type G units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 998

Type Designation GS/CNS

Back 998

A unit that operates on either gasoline or compressed natural gas and, in addition to meeting all the requirements for Type G/CN units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 999

Type Designation GS/LPS

Back 999

A unit that operates on either gasoline or liquefied petroleum gas and, in addition to meeting all the requirements for the Type G/LP units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 1000

Type Designation LP

Back 1000

An LP-Gas-powered unit that has minimum acceptable safeguards against inherent fire hazards.

Front 1001

Type Designation LPS

Back 1001

An LP-Gas-powered unit that, in addition to meeting the requirements for Type LP units, is provided with additional safeguards to the exhaust, fuel, and electric systems.

Front 1002

Type D FIBC

Back 1002

A flexible intermediate bulk container (FIBC) constructed from fabric and/or threads with special static properties designed to control electrostatic discharge incendivity, without grounding.

Front 1003

Type D FIBC

Back 1003

A flexible intermediate bulk container (FIBC) constructed from fabric and/or threads with special static properties designed to control electrostatic discharge incendivity, without grounding. [654, 2006]

Front 1004

Type FCC Cable

Back 1004

Three or more flat copper conductors placed edge-to-edge and separated and enclosed within an insulating assembly.

Front 1005

Type HT Factory-Built, Residential-Type and/or Building Heating Appliance Type Chimney

Back 1005

A residential type and building heating appliance chimney suitable for use at 1000°F (538°C), which complies with the optional
10-minute 2100°F (1449°C) temperature test of UL 103, Standard for Factory-Built Chimneys for Residential Type and Building Heating Appliance. Such chimneys are labeled as Type HT and are required for certain solid fuel-fired applications. (See 6.1.3.1.)

Front 1006

Type I

Back 1006

Systems employing Class I solvents are prohibited by this standard per
4.2.1.1 [e.g., 50°F (10°C) flash point naphtha].

Front 1007

Type I Discharge Outlet

Back 1007

An approved discharge outlet that conducts and delivers foam gently onto the liquid surface without submergence of the foam or agitation of the surface.

Front 1008

Type II

Back 1008

Systems employing Class II solvents and complying with the requirements of Chapters 4, 5, 6, and 7 (e.g., Stoddard solvent).

Front 1009

Type II Discharge Outlet

Back 1009

An approved discharge outlet that does not deliver foam gently onto the liquid surface but is designed to lessen submergence of the foam and agitation of the surface.

Front 1010

Type IIIA

Back 1010

Systems employing Class IIIA solvents and complying with the requirements of Chapters 4, 5, 6, and 8 [e.g., 140°F (60°C) solvent].

Front 1011

Type IIIB

Back 1011

Systems employing Class IIIB liquids and complying with the requirements of Chapters 4, 5, 6, and 8 (e.g., specially compounded oils).

Front 1012

Type ITC Instrumentation
Tray Cable

Back 1012

A factory assembly of two or more insulated conductors, with or without a grounding conductor(s), enclosed in a nonmetallic sheath.

Front 1013

Type IV

Back 1013

Systems employing Class IV solvents and complying with the requirements of Chapters 4, 5, 6, and 9.

Front 1014

Type L Gas Vent

Back 1014

A vent for venting appliances listed for use with Type L vents and appliances listed for use with Type B gas vents.

Front 1015

Type L Vent

Back 1015

A vertical or nearly vertical vent composed of listed factory-built components assembled in accordance with the terms of listing for conveying flue gases from oil and gas appliances or their vent connectors to the outside atmosphere.

Front 1016

Type NM

Back 1016

Insulated conductors enclosed within an overall nonmetallic jacket.

Front 1017

Type NMC

Back 1017

Insulated conductors enclosed within an overall, corrosion resistant, nonmetallic jacket.

Front 1018

Type NMS

Back 1018

Insulated power or control conductors with signaling, data, and communications conductors within an overall nonmetallic jacket.

Front 1019

Type of Protection “n”

Back 1019

Type of protection where electrical equipment, in normal operation, is not capable of igniting a surrounding explosive gas atmosphere and a fault capable of causing ignition is not likely to occur.

Front 1020

Type X Pressurizing

Back 1020

Reduces the classification within the protected enclosure from Division 1 or Zone 1 to unclassified.

Front 1021

Type Y Pressurizing

Back 1021

Reduces the classification within the protected enclosure from Division 1 to Division 2 or Zone 1 to Zone 2.

Front 1022

Type Z Pressurizing

Back 1022

Reduces the classification within the protected enclosure from Division 2 or Zone 2 to unclassified.

Front 1023

UAC

Back 1023

Abbreviation for universal air connection.

Front 1024

UL

Back 1024

Underwriters Laboratories Inc.

Front 1025

UL

Back 1025

Underwriters Laboratories Inc. [58, 2008]

Front 1026

Ullage Hole

Back 1026

An opening in a tank hatch that allows measuring of liquid cargo.

Front 1027

Ultimate Failure

Back 1027

Collapse of a ground ladder structure or component thereof.

Front 1028

Ultimate Failure

Back 1028

Collapse of a ground ladder structure or component thereof. [1931:3.3]

Front 1029

Ultimate Strength

Back 1029

The pressure that results in the failure of the weakest structural component of an enclosure.

Front 1030

Ultimate Strength

Back 1030

The strength of a material in tension, compression, or shear, respectively, that is the maximum tensile, compressive, or shear stress that the material can sustain, calculated on the basis of the ultimate load and the original
or unrestrained dimensions.

Front 1031

Ultra High-Speed Water Spray
System

Back 1031

A type of automatic water spray system where water spray is rapidly applied to protect specific hazards where deflagrations are anticipated.

Front 1032

Ultra High-Speed Water Spray
System — Area Application

Back 1032

The application of ultra high-speed water spray over a specific floor area or over the surface area of a specific object.

Front 1033

Ultra High-Speed Water Spray
System — Local Application

Back 1033

The application of ultra high-speed water spray on a specific point or points of ignition, such as cutting, mixing or grinding operations.

Front 1034

Ultrasonic Inspection

Back 1034

A nondestructive method of inspection in which high-frequency vibrations are injected through the surface of the test material and bounced back to their source from the opposite surface; if a flaw exists, signals return in a different pattern, revealing the location and extent of the flaw.

Front 1035

Unattended

Back 1035

Any machine or device that is not regularly operated by a miner or not in direct line of sight of a miner that is assigned within 500 ft of the equipment during each production shift.

Front 1036

Unattended Laboratory
Operation

Back 1036

A laboratory procedure or operation at which there is no person present who is knowledgeable regarding the operation and emergency shutdown procedures.

Front 1037

Unattended Laboratory
Operation

Back 1037

A laboratory procedure or operation at which there is no person present who is knowledgeable regarding the operation and emergency shutdown procedures. [45, 2004] (LAB)

Front 1038

Unattended Operation

Back 1038

A means of operation where the operator is not in view of operating instrumentation (local or remote), nor in a position to operate control systems.

Front 1039

Unattended Self-Service Motor Fuel Dispensing Facility

Back 1039

A motor fuel dispensing facility that has no attendant or employee on duty. The customer or vehicle operator conducts the dispensing operation. This includes coin, currency, membership card, and credit card dispensing operations.

Front 1040

Unauthorized Discharge

Back 1040

A release or emission of materials in a manner that does not conform to the provisions of this Code or applicable public health and safety regulations.

Front 1041

Unauthorized Person

Back 1041

A person who does not have permission to enter a protected premises or is not authorized to have access to specific confidential information.

Front 1042

Unbalanced Voltages

Back 1042

Unequal voltage values on 3-phase circuits that can exist anywhere on the power distribution system.

Front 1043

Unbuilt Area

Back 1043

Those portions of a development intended to be built on that have not yet been populated with structures.

Front 1044

Uncertainty Analysis

Back 1044

An analysis intended to (1) identify key sources of uncertainties in the predictions of a model, (2) assess the potential impacts of these uncertainties on the predictions, and (3) assess the likelihood of these potential impacts. Per this definition, sensitivity analysis performs
some but not all of the functions of uncertainty analysis. (See also
3.3.41.1, Completeness Uncertainty; 3.3.41.2, Model Uncertainty; and
3.3.41.3, Parameter Uncertainty.)

Front 1045

Uncertainty Analysis

Back 1045

An analysis performed to determine the degree to which a predicted value will vary.

Front 1046

Uncertainty Analysis

Back 1046

An analysis performed to determine the degree to which a predicted value will vary. [101, 2006]

Front 1047

Uncertainty Analysis

Back 1047

An analysis performed to determine the degree to which a predicted value will vary. [5000, 2003]

Front 1048

Uncertainty Analysis

Back 1048

An analysis performed to determine the degree to which a predicted value will vary. [5000, 2006]

Front 1049

Uncertainty Analysis

Back 1049

An analysis performed to determine the degree to which a predicted value will vary. [5000, 2009]

Front 1050

Unclassified Locations

Back 1050

Locations determined to be neither Class I, Division 1; Class I, Division 2; Class I, Zone 0; Class I, Zone 1; Class I, Zone 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; Class III, Division
2; or any combination thereof.

Front 1051

Unclassified Locations

Back 1051

Locations determined to be neither Class I, Division 1; Class I, Division 2; Class I, Zone 0; Class I, Zone 1; Class I, Zone 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; Class III, Division
2; Zone 20; Zone 21; Zone 22; or any combination thereof.

Front 1052

Unconfined Space

Back 1052

Any space whose volume is equal to or greater than 50 ft3 per 1000
Btu/hr (4.8 m3 per kW) of the aggregate input rating of all fuel-burning appliances installed therein.

Front 1053

Uncontrolled Stop

Back 1053

The stopping of machine motion by removing power to the machine actuators, all brakes and/or other mechanical stopping devices being activated.

Front 1054

Unconventional Means of
Transportation

Back 1054

Can include, but are not limited to, bicycles, motorcycles, scooters, skateboards, and rollerblades.

Front 1055

Underaxle Clearance

Back 1055

The clearance distance between the ground and the center drive train of the vehicle; generally this measurement is taken at the low point bottom of the drive differentials.

Front 1056

Underbody Clearance
Dimensions

Back 1056

The dimensions determined with the vehicle fully loaded and fully equipped, unless otherwise specified.

Front 1057

Undercarriage

Back 1057

All components of an aircraft landing gear assembly.

Front 1058

Underfeed Stoker

Back 1058

A stoker in which fuel is introduced through retorts at a level below the location of air admission to the fuel bed. Underfeed stokers are divided into three general classes.

Front 1059

Undergrate Air

Back 1059

Combustion air introduced below the grate.

Front 1060

Underground Feeder and Branch-Circuit Cable, Type UF

Back 1060

A factory assembly of one or more insulated conductors with an integral or an overall covering of nonmetallic material suitable for direct burial in the earth.

Front 1061

Underground Structure

Back 1061

A structure located in an underground tunnel, a shaft, a chamber, or a passageway; or cut and covered excavation.

Front 1062

Underground Structure

Back 1062

A structure or portions of a structure in which the floor level is below the level of exit discharge.

Front 1063

Underlayment

Back 1063

A layer of materials installed between a deck finish and the deck below.

Front 1064

Understanding or Agreement

Back 1064

A written or oral consensus between the interested parties concerning the management of the investigations.

Front 1065

Undertruck Nozzle

Back 1065

A small nozzle device that hangs below the vehicle and disperses foam solution in a manner that provides protection for the vehicles from ground or grass proximity fires; these devices spray agent from wheel to wheel and front to back of the underside of the truck.

Front 1066

Undervoltage Protection

Back 1066

The effect of a device that operates on the reduction or failure of voltage to cause and maintain the interruption of power.

Front 1067

Undeveloped Space

Back 1067

Subterranean space that has been mined but has not been altered for the use of advanced industrial capability, technological sophistication, or economic productivity.

Front 1068

Unenclosed Spray Area

Back 1068

Any spray area that is not confined by a limited finishing workstation, spray booth, or spray room, as herein defined.

Front 1069

Unequipped Fire Apparatus

Back 1069

The completed fire apparatus excluding personnel, agent(s), and any equipment removable without the use of tools.

Front 1070

Unequipped Fire Apparatus

Back 1070

The completed fire apparatus excluding personnel, agent(s), and any equipment removable without the use of tools. [1901, 2003]

Front 1071

Unframed Fire Safety Curtain

Back 1071

A straight lift fire safety curtain containing no internal vertical framing members.

Front 1072

Unfueled Aircraft

Back 1072

An aircraft whose fuel system has had flammable or combustible liquid removed so that no tank, cell, or piping contains more than one-half percent of its volumetric capacity.

Front 1073

Unfueled Aircraft

Back 1073

An aircraft whose fuel system has had flammable or combustible liquid removed such that no tank, cell, or piping contains more than
1/ percent of its volumetric capacity.
2

Front 1074

Ungrounded

Back 1074

Not connected to ground or to a conductive body that extends the ground connection.

Front 1075

Ungrounded

Back 1075

Not connected to ground or to a conductive body that extends the ground connection. [70, 2008]

Front 1076

Unified Area Command

Back 1076

A command established where incidents under an area command are multi-agency or -jurisdictional. (See also 3.3.4, Area Command.)

Front 1077

Unified Command

Back 1077

An application of the incident command system (ICS) that allows all agencies with jurisdictional responsibility for an incident or planned event, either geographical or functional, to manage an incident or planned event by establishing a common set of incident objectives and strategies.

Front 1078

Unified Command

Back 1078

A standard method to coordinate command of an incident where multiple agencies have jurisdiction.

Front 1079

Unified Command

Back 1079

A team effort that allows all agencies with jurisdictional responsibility for an incident or planned event, either geographical or functional, to manage the incident or planned event by establishing a common set
of incident objectives and strategies.

Front 1080

Uniform Corrosion

Back 1080

Removal of metal by chemical means over the entire surface.

Front 1081

Unimproved Surfaces

Back 1081

Surfaces that are not paved or surface coated for heavy automotive travel and include dirt, clay, shale, or crushed rock that is not maintained on a regular basis.

Front 1082

Uninspected Vessel

Back 1082

A vessel operated on the navigable waterways of the United States that is subject to the regulations in 46 CFR Subchapter C, Parts 24-28, including pleasure craft, tugboats, towing vessels, and certain fishing vessels.

Front 1083

Uninsulated

Back 1083

Refers to equipment, structures, or vessels not provided with an encapsulating material that meets the requirements defined as “insulated.”

Front 1084

Uninterruptible Power Supply
(UPS)

Back 1084

A system consisting of a battery source, a converter, an inverter, and control equipment designed to provide a clean, conditioned sinusoidal wave of power for a finite period of time.

Front 1085

Uninterruptible Power Supply
(UPS)

Back 1085

A system designed to provide power, without delay or transients, during any period when the primary power source is incapable of performing.

Front 1086

Unit

Back 1086

An engine company, truck company, or other functional or administrative group.

Front 1087

Unit

Back 1087

A staffed and equipped emergency response vehicle.

Front 1088

Unit

Back 1088

The combined spaces of the furnace and the associated boiler passes, ducts, and fans that convey the gases of combustion to the stack; for HRSGs, the combined spaces of the combustion turbine, the HRSG, and the associated ducts that convey the air and combustion gases from the air intake to the stack; for other combustion turbine exhaust systems, the combined spaces of the combustion turbine, and the associated ducts that convey the air and combustion gases from the air intake to the stack.

Front 1089

Unit

Back 1089

The organizational element having functional responsibility for a specific incident operations, planning, logistics, or finance/administration activity.

Front 1090

Unit Acknowledgment

Back 1090

The time that the response unit(s) acknowledge that they have received the notification.

Front 1091

Unit Arrived on Scene

Back 1091

The time that the vehicle comes to a complete stop at the scene.

Front 1092

Unit Broiler

Back 1092

A broiler constructed as a separate appliance.

Front 1093

United Kingdom Civil Aviation
Authority (CAA)

Back 1093

A UK agency charged with the responsibility of regulating safety in civil aviation.

Front 1094

Unit en Route

Back 1094

The time that the vehicle first begins moving toward the scene.

Front 1095

Unit Heater

Back 1095

A self-contained heating appliance that might or might not include an integral fan for circulating air and that can be of the floor-mounted or suspended type that is intended for the heating of the space in which
it is installed. A unit heater can be an indirect-fired fuel-burning appliance or might utilize steam, hot water, or electricity.

Front 1096

Unit Heater

Back 1096

A self-contained heating appliance that might or might not include an integral fan for circulating air, that can be of the floor-mounted or suspended type and that is intended for the heating of the space in which it is installed.

Front 1097

Unitized Rigid Body and
Frame Structure

Back 1097

A structure in which parts that generally comprise a separate body are integrated with the chassis frame to form a single, rigid, load-carrying structure.

Front 1098

Unit Left Scene

Back 1098

The time that the vehicle first begins moving from the scene.

Front 1099

Unit Load

Back 1099

A pallet load or module held together in some manner and normally transported by material-handling equipment.

Front 1100

Unit Log

Back 1100

A recording of activities within a specified portion of the incident command structure.

Front 1101

Unit Operation or Unit
Process

Back 1101

A segment of a physical or chemical process that might or might not be integrated with other segments to constitute the manufacturing sequence.

Front 1102

Unit Operation or Unit
Process

Back 1102

A segment of a physical or chemical process that might or might not be integrated with other segments to constitute the manufacturing sequence. [30, 2008]

Front 1103

Unit Process

Back 1103

A stage or step in the treatment of wastewater.

Front 1104

Unity of Command

Back 1104

The concept by which each person within an organization reports to one and only one designated person.

Front 1105

Universal Air Connection
(UAC)

Back 1105

The male fitting, affixed to the SCBA, and the female fitting, affixed to the filling hose, to provide emergency replenishment of breathing air to an SCBA breathing air cylinder. Also known as Rapid Intervention Crew/Company Universal Air Connection.

Front 1106

Universal Cylinder

Back 1106

A cylinder that can be connected for service in either the vertical or the horizontal position, so that the fixed maximum liquid level gauge, pressure relief device, and withdrawal appurtenances function properly in either position.

Front 1107

Universal Precautions

Back 1107

An approach to infection control in which human blood and certain human body fluids are treated as if known to be infectious for HIV, HBV, and other bloodborne pathogens.

Front 1108

Unlined Hose

Back 1108

A hose consisting of only a woven jacket that is usually of linen yarns and is of such quality that the yarn swells when wet, tending to seal the hose.

Front 1109

Unlisted Metal (Smokestack) Chimney

Back 1109

A manufactured or field-constructed chimney intended only for nonresidential applications having one or more metal walls, or made of metal with a refractory lining, and that is capable of withstanding the flue gas conditions of its use.

Front 1110

Unlisted Metal (Smokestack) Chimney

Back 1110

A manufactured or field-constructed chimney intended only for nonresidential applications, having one or more metal walls or made of metal with a refractory lining, that is capable of withstanding the flue gas conditions of its use. [211, 2006]

Front 1111

Unloader Valve

Back 1111

A valve that is designed to relieve excess flow below pump capacity at set pump pressure.

Front 1112

Unmanned Space

Back 1112

A space that is occasionally occupied.

Front 1113

UN/NA Identification
Number

Back 1113

The four-digit number assigned to a hazardous material/weapon of mass destruction (WMD), which is used to identify and
cross-reference products in the transportation mode.

Front 1114

Unobstructed Construction

Back 1114

Construction where beams, trusses, or other members do not impede heat flow or water distribution in a manner that materially affects the ability of sprinklers to control or suppress a fire. Unobstructed construction has horizontal structural members that are not solid, where the openings are at least 70 percent of the cross-section area and the depth of the member does not exceed the least dimension of the openings, or all construction types where the spacing of structural members exceeds 71⁄2 ft (2.3 m) on center.

Front 1115

Unoccupiable

Back 1115

An area or space that cannot be occupied due to dimensional or other physical constraints.

Front 1116

Unoccupiable Enclosure or
Space

Back 1116

An enclosure or space that has dimensions and physical characteristics such that it could not be entered by a person.

Front 1117

Unoccupied Building

Back 1117

A building that is normally unoccupied during its entire period of daily operations.

Front 1118

Unpierced Wall

Back 1118

A wall that is allowed to have pipes or conduits passing through it, or unopenable windows, glazed with safety glass or wired glass, set in it, but such openings are sealed to prevent the flow of air between adjacent rooms.

Front 1119

Unqualified Person

Back 1119

A person who is not a qualified person.

Front 1120

Unrefined Tantalum Powder

Back 1120

Any tantalum powder that contains impurities, such that further refinement is required to produce a tantalum product suitable for commercial use.

Front 1121

Unscheduled Record

Back 1121

A record in which the final disposition has not been approved by the responsible party.

Front 1122

Unsprung Weight

Back 1122

The total weight of all vehicle components that are not supported completely by the suspension system.

Front 1123

Unstable Liquid

Back 1123

A liquid that, in the pure state or as commercially produced or transported, will vigorously polymerize, decompose, undergo condensation reaction, or become self-reactive under conditions of shock, pressure, or temperature.

Front 1124

Unstable Liquid

Back 1124

A liquid that, in the pure state or as commercially produced or transported, will vigorously polymerize, decompose, undergo condensation reaction, or become self-reactive under conditions of shock, pressure, or temperature. [30, 2003]

Front 1125

Unstable Materials

Back 1125

A material that, in the pure state or as commercially produced, will vigorously polymerize, decompose or condense, become self-reactive, or otherwise undergo a violent chemical change under conditions of shock, pressure, or temperature.

Front 1126

Unstable or Reactive Materials

Back 1126

A liquid that, in the pure state or as commercially produced or transported, will vigorously polymerize, decompose, undergo condensation reaction, or become self-reactive under conditions of shock, pressure, or temperature. [30, 2003]

Front 1127

Unstable Reactive Gas

Back 1127

A gas that, in the pure state or as commercially produced, will vigorously polymerize, decompose, or condense, become self-reactive, or otherwise undergo a violent chemical change under conditions of shock, pressure, or temperature.

Front 1128

Unstable Reactive Gas

Back 1128

A gas that, in the pure state or as commercially produced, will vigorously polymerize, decompose, or condense, become self-reactive, or otherwise undergo a violent chemical change under conditions of shock, pressure, or temperature. [55, 2005]

Front 1129

Unstable (Reactive) Material

Back 1129

A material that, in the pure state or as commercially produced, will vigorously polymerize, decompose or condense, become self-reactive, or otherwise undergo a violent chemical change under conditions of shock, pressure, or temperature.

Front 1130

Unstable (Reactive) Material

Back 1130

A material that, in the pure state or as commercially produced, will vigorously polymerize, decompose or condense, become self-reactive, or otherwise undergo a violent chemical change under conditions of shock, pressure, or temperature. [5000, 2009]

Front 1131

Unsteady Fire

Back 1131

A fire that has a heat release rate that varies with respect to time.

Front 1132

Unvented Room Heater

Back 1132

An unvented, self-contained, freestanding, nonrecessed, fuel gas burning appliance for furnishing warm air by gravity or fan circulation to the space in which installed, directly from the heater without duct connection.

Front 1133

Upgrade

Back 1133

The substitution or addition of components or systems with new components or systems with improved performance or capability.

Front 1134

Upholstered Furniture

Back 1134

For the purpose of this test method, a unit of interior furnishing that has any surface covered, in whole or in part, with a fabric or related upholstery cover material, contains upholstery material, and is intended or promoted for sitting or reclining.

Front 1135

Upholstery Cover Material

Back 1135

The outermost layer of fabric or related material used to enclose the main support system, upholstery materials, or both, used in a furniture item.

Front 1136

Upholstery Material

Back 1136

The padding, stuffing, or filling material used in a furniture item, which can be either loose or attached, enclosed by an upholstery cover material, or located between the upholstery cover material and support system, if present.

Front 1137

Upper

Back 1137

That part of the protective footwear including, but not limited to, the toe, vamp, quarter, shaft, collar, and throat; but not including the sole with heel, puncture-resistant device, and insole.

Front 1138

Upper

Back 1138

The part of the protective footwear including, but not limited to, the toe, vamp, quarter, shaft, collar, and throat, but excluding the sole with heel, puncture-resistant device, and insole.

Front 1139

Upper Body

Back 1139

The area of body above the waist and extending to the shoulder, including the arms and wrists but excluding the hands.

Front 1140

Upper Body

Back 1140

The area of the body above the waist and extending to the shoulders, including the arms and wrists but excluding the hands.

Front 1141

Upper Flammable Limit (UFL)

Back 1141

That concentration of a combustible material in air above which ignition will not occur.

Front 1142

Upper Flammable Limit (UFL)

Back 1142

The highest concentration of a combustible substance in a gaseous oxidizer that will propagate a flame.

Front 1143

Upper Flammable Limit (UFL)

Back 1143

The highest concentration of a combustible substance in a gaseous oxidizer that will propagate a flame. [68, 2007]

Front 1144

Upper Torso

Back 1144

The area of body trunk above the waist and extending to the shoulder, excluding the arms and wrists, and hands.

Front 1145

Upper Torso

Back 1145

The area of body trunk above the waist and extending to the shoulder, excluding the arms, wrists, and hands.

Front 1146

Upper Torso

Back 1146

The area of the body trunk above the waist and extending to the shoulder, excluding the arms, wrists, and hands.

Front 1147

Upright Broiler

Back 1147

An appliance used in the preparation of food whereby foods are exposed to intense radiant heat, and perhaps to convective heat, with the food or the food and the radiant source not limited to a horizontal mode.

Front 1148

Upright Sprinkler

Back 1148

A sprinkler designed to be installed in such a way that the water spray is directed upwards against the deflector.

Front 1149

Upright Sprinkler

Back 1149

A sprinkler designed to be installed in such a way that the water spray is directed upwards against the deflector. [13, 2007]

Front 1150

Urban Area

Back 1150

As defined by the U.S. Census Bureau, an area with at least 1000 people per square mile.

Front 1151

USCG

Back 1151

United States Coast Guard.

Front 1152

U.S. Department of
Transportation (DOT)

Back 1152

The department that has jurisdiction over the design and transportation of compressed gas cylinders and cartridges.

Front 1153

Use

Back 1153

To place a material into action, including solids, liquids, and gases.

Front 1154

Use Condition I — Free
Egress

Back 1154

Free movement is allowed from sleeping areas and other spaces where access or occupancy is permitted to the exterior via means of egress that meet the requirements of NFPA 101, Life Safety Code. [101, 2009]

Front 1155

Use Condition III — Zoned
Impeded Egress

Back 1155

Free movement is allowed within individual smoke compartments, such as within a residential unit comprised of individual sleeping rooms and a group activity space, with egress impeded by
remote-controlled release of means of egress from such a smoke compartment to another smoke compartment. [101, 2009]

Front 1156

Use Condition II — Zoned
Egress

Back 1156

Free movement is allowed from sleeping areas and any other occupied smoke compartment to one or more other smoke compartments. [101, 2009]

Front 1157

Use Condition IV — Impeded
Egress

Back 1157

Free movement is restricted from an occupied space, and
remote-controlled release is provided to allow movement from all
sleeping rooms, activity spaces, and other occupied areas within the
smoke compartment to another smoke compartment. [101, 2009]

Front 1158

Use Condition V — Contained

Back 1158

Free movement is restricted from an occupied space, and
staff-controlled manual release at each door is provided to allow
movement from all sleeping rooms, activity spaces, and other
occupied areas within the smoke compartment to another smoke
compartment.[101, 2009]

Front 1159

Used Oil

Back 1159

Oil that consists of primarily used automotive crankcase oil from internal combustion engines, including, but not limited to, used engine oils, used automotive transmission fluids, used gear lubricants, machining oils, used hydraulic fluids, or any mixture thereof and that can vary considerably in its chemical and physical properties.

Front 1160

Useful Record

Back 1160

A temporary record that is normally accumulated in operations and is kept for a time period established by the responsible party.

Front 1161

Use (Material)

Back 1161

Placing a solid, liquid, or gaseous material into action or keeping a solid or liquid material in an open vessel.

Front 1162

Use Permit

Back 1162

A document issued by the AHJ for the purpose of authorizing the use of specific flame effects in a specific venue on a specified date and time or within a specified period.

Front 1163

Use Point

Back 1163

A location with any number of station outlets and inlets arranged for access by a practitioner during treatment of a patient. (PIP)

Front 1164

User

Back 1164

An entity that utilizes the machine and its associated electrical equipment.

Front 1165

Utilities

Back 1165

Building service control and distribution systems and their associated equipment, pipes, ducts, wires, and cables.

Front 1166

Utility

Back 1166

An organization, either designated by or recognized by public service commissions or public utility commissions, or recognized as such under federal, state, or local law, that installs, operates, and maintains electric supply or communication systems such as, but not limited to, telephone, wireless, VoIP, CATV, internet, satellite, or data service.

Front 1167

Utility Air

Back 1167

Air used for purposes other than human respiration.

Front 1168

Utility Center (J box)

Back 1168

A type of terminal enclosure for utilities (e.g., gas power, vacuum, water, electrical power) used in office-based occupancies. (PIP)

Front 1169

Utility Connection

Back 1169

The connection of the manufactured home to existing utilities that include, but are not limited to, electricity, water, sewer, gas, or fuel oil.

Front 1170

Utility Connection Assembly

Back 1170

A single hookup assembly located on the site and containing connections for any of the following: potable water, sewer inlets, electrical power, phone, or television.

Front 1171

Utility Gases

Back 1171

Natural gas, manufactured gas, liquefied petroleum gas-air mixtures, or mixtures of any of these gases.

Front 1172

Utility Gas Plant

Back 1172

A plant that stores and vaporizes LP-Gas for distribution that supplies either LP Gas or LP-Gas gas-air mixtures to a gas distribution system of
10 or more customers.

Front 1173

Utility-Interactive Inverter

Back 1173

An inverter intended for use in parallel with an electric utility to supply common loads that may deliver power to the utility.

Front 1174

Utility-Interactive Inverter
Output Circuit

Back 1174

The conductors between the utility interactive inverter and the service equipment or another electric power production source, such as a utility, for electrical production and distribution network.

Front 1175

Utility Sink

Back 1175

A separate sink used for cleaning ensembles and ensemble elements.

Front 1176

Utility Technical Rescue
Protective Ensemble

Back 1176

Multiple elements of protective clothing and protective equipment designed and configured as an ensemble to provide limited protection in operational settings where exposure to physical and thermal hazards are expected.

Front 1177

Utility Technical Rescue Protective Ensemble Elements

Back 1177

The parts that comprise the utility technical rescue protective ensemble, that include coats, trousers, coveralls, helmets, gloves, footwear, and interface components.

Front 1178

Utility Technical Rescue Protective Footwear Element

Back 1178

An element of the utility technical rescue protective ensemble that provides protection to the foot, ankle, and lower leg that is certified to the utility protection requirements.

Front 1179

Utility Technical Rescue Protective Garment Element

Back 1179

The coat, trouser, or coverall of the certified utility technical rescue protective ensemble that provides protection to the upper and lower torso, arms, and legs.

Front 1180

Utility Technical Rescue
Protective Glove Element

Back 1180

The element of the certified utility technical rescue protective ensemble that provides protection to the hand and wrist.

Front 1181

Utility Technical Rescue
Protective Goggle Element

Back 1181

The element of the certified utility technical rescue protective ensemble that provides partial protection to the face and eyes.

Front 1182

Utility Technical Rescue
Protective Helmet Element

Back 1182

The element of the certified utility technical rescue protective ensemble that provides protection to the head.

Front 1183

Utilization Equipment

Back 1183

Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes.

Front 1184

Utilization Equipment

Back 1184

Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. [70:100.I]

Front 1185

Utilization Equipment

Back 1185

Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. [70, 2005]

Front 1186

Utilization Equipment

Back 1186

Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. [70, 2008]

Front 1187

Vacant

Back 1187

No furnishings or equipment present.

Front 1188

Vacuum

Back 1188

A space in which the pressure is far below atmospheric pressure so that the remaining gases do not affect processes being carried out in the space.

Front 1189

Vacuum

Back 1189

The reduction in atmospheric pressure inside a pump or suction hose.

Front 1190

Vacuum Breaker

Back 1190

A device that prevents back siphonage by allowing atmosphere air pressure into the system.

Front 1191

Vacuum Filter

Back 1191

A unit process, used to dewater wastewater sludge, consisting of a cylindrical drum mounted on a horizontal axis, covered with a media, and subjected to an internal vacuum.

Front 1192

Vacuum Gauge

Back 1192

A device that indicates the absolute gas pressure in a vacuum system.

Front 1193

Vacuum Pump

Back 1193

A compressor for exhausting air and noncondensable gases from a space that is to be maintained at subatmospheric pressure.

Front 1194

Vacuum Pump

Back 1194

A pump used to evacuate the head space (above the base product) of an aerosol container prior to addition of the propellant.

Front 1195

Vacuum Pumping System

Back 1195

A system of pumps, valves and associated piping and wiring, related protective equipment, and measuring and control instrumentation that produce and control the level of vacuum in a vacuum furnace.

Front 1196

Vacuum Relief Valve

Back 1196

A valve that automatically opens and closes a vent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value.

Front 1197

Vacuum System

Back 1197

A chamber with walls capable of withstanding atmospheric pressure and an opening through which gas can be removed through a pipe or manifold to a pumping system, and including all pumps, gauges, valves, and other components.

Front 1198

Vacuum-Type Insulation

Back 1198

A highly reflective double-wall structure with high vacuum between the walls; used as insulation in cryogenic systems for the reduction of heat transfer.

Front 1199

Validation

Back 1199

The process of determining the correctness of the assumptions and governing equations implemented in a method.

Front 1200

Values at Risk

Back 1200

Public and private resources, which include, but are not limited to, property, structures, physical improvements, natural and cultural resources, community infrastructure, and economic, environmental, and social values.

Front 1201

Valve

Back 1201

A device used in piping to control the gas supply to any section of a system of piping or to an appliance.

Front 1202

Valve Actuator Motor (VAM) Assemblies

Back 1202

A manufactured assembly, used to operate a valve, consisting of an actuator motor and other components such as controllers, torque switches, limit switches, and overload protection.

Front 1203

Valve Crimper (Crimper)

Back 1203

A machine that seals the valve cup or valve ferrule to the aerosol container.

Front 1204

Valve Member

Back 1204

That part of a gas valve rotating within or in respect to the valve body
that, by its position with respect to the valve body, controls the flow of gas.

Front 1205

Valve Outlet Cap or Plug

Back 1205

A removable device that forms a gastight seal on the outlet to the control valve that is provided on a source containing a compressed gas or cryogenic fluid.

Front 1206

Valve Outlet Cap or Plug

Back 1206

A removable device that forms a gastight seal on the outlet to the control valve that is provided on a source containing a compressed gas or cryogenic fluid. [55, 2005]

Front 1207

Valve Protection Cap

Back 1207

A rigid, removable cover provided for container valve protection during handling, transportation, and storage.

Front 1208

Valve Protection Cap

Back 1208

A rigid, removable cover provided for container valve protection during handling, transportation, and storage. [55, 2005]

Front 1209

Valve Protection Device

Back 1209

A device attached to the neck ring or body of a cylinder for the purpose of protecting the cylinder valve from being struck or from being damaged by the impact resulting from a fall or an object striking the cylinder.

Front 1210

Valve Protection Device

Back 1210

A device attached to the neck ring or body of a cylinder for the purpose of protecting the cylinder valve from being struck or from being damaged by the impact resulting from a fall or an object striking the cylinder. [1, 2003]

Front 1211

Valve-Proving System

Back 1211

In a gaseous or liquid fuel system, a system that proves the leak tightness of all safety shutoff valves and prevents main burner or igniter light-off if the test is not satisfied.

Front 1212

Valve Proving System

Back 1212

A system used to check the closure of safety shutoff valves by detecting leakage.

Front 1213

Valve-Regulated Lead Acid
(VRLA) Battery

Back 1213

A battery that has no provision for the addition of water or electrolyte or for external measurement of electrolyte specific gravity.

Front 1214

Valve-Regulated (VRLA)

Back 1214

A lead-acid battery consisting of sealed cells furnished with a valve that opens to vent the battery whenever the internal pressure of the battery exceeds the ambient pressure by a set amount.

Front 1215

Valve-Regulated (VRLA)

Back 1215

A lead-acid battery consisting of sealed cells furnished with a valve that opens to vent the battery whenever the internal pressure of the battery exceeds the ambient pressure by a set amount. [1, 2003]

Front 1216

Valve-Regulated (VRLA)

Back 1216

A lead-acid battery consisting of sealed cells furnished with a valve that opens to vent the battery whenever the internal pressure of the battery exceeds the ambient pressure by a set amount. In VRLA batteries, the liquid electrolyte in the cells is immobilized in an absorptive glass mat (AGM cells or batteries) or by the addition of a gelling agent (gel cells or gelled batteries).

Front 1217

Vapor

Back 1217

The gas phase of a substance, particularly of those that are normally liquids or solids at ordinary temperatures. [921, 2004]

Front 1218

Vapor

Back 1218

The gas phase of a substance, particularly of those that are normally liquids or solids at ordinary temperatures. (See also 3.3.81, Gas.)

Front 1219

Vapor Area

Back 1219

Any area in the vicinity of: (1) a dipping or coating process and its drainboard, (2) associated drying or conveying equipment, (3) the interior of any exhaust plenum or any exhaust duct leading from the process, (4) other associated equipment that could contain a flammable vapor concentration exceeding 25 percent of the lower flammable limit (LFL) during operation or shutdown periods.

Front 1220

Vaporizer

Back 1220

A device other than a container that receives LNG or LH2 in liquid form and adds sufficient heat to convert the liquid to a gaseous state, or a device used to add heat to LNG or LH2 for the purpose of saturating LNG or LH2.

Front 1221

Vaporizer

Back 1221

A device, other than a container, that receives LP-Gas in liquid form and adds sufficient heat to convert the liquid to a gaseous state.

Front 1222

Vaporizer

Back 1222

A device, other than a container, that receives LP-Gas in liquid form and adds sufficient heat to convert the liquid to a gaseous state. [58,
2008]

Front 1223

Vaporizer

Back 1223

A heat exchange unit designed to convert cryogenic liquid into the gaseous state. (PIP)

Front 1224

Vaporizing Burner
(Self-Vaporizing Liquid
Burner)

Back 1224

A burner that also vaporizes liquid LP-Gas prior to burning it.

Front 1225

Vaporizing Thermal Oil
Heating System

Back 1225

A thermal oil heating system that is designed to heat the oil above its atmospheric boiling point as it passes through the heater.

Front 1226

Vapor Opening

Back 1226

An opening through a tank shell or roof that is above the surface of the stored liquid and that is provided for tank breathing, tank gauging, fire fighting, or other operating purposes.

Front 1227

Vapor Pressure

Back 1227

The pressure, measured in pounds per square inch, absolute (psia), exerted by a liquid, as determined by ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method).

Front 1228

Vapor Pressure

Back 1228

The pressure, measured in pounds per square inch, absolute (psia), exerted by a liquid, as determined by ASTM D 323, Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method).

Front 1229

Vapor Pressure

Back 1229

The pressure, measured in pounds per square inch, absolute (psia), exerted by a liquid, as determined by ASTM D 323, Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method).
[30, 2008]

Front 1230

Vapor Pressure

Back 1230

The pressure, measured in pounds per square inch absolute (psia), exerted by a liquid, as determined by ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method).
[30, 2003]

Front 1231

Vapor Processing Equipment

Back 1231

Those components of a vapor processing system designed to process vapors or liquids captured during transfer or filling operations.

Front 1232

Vapor Processing Equipment

Back 1232

Those components of a vapor processing system designed to process vapors or liquids captured during transfer or filling operations. [30,
2008]

Front 1233

Vapor Processing System

Back 1233

A system designed to capture and process vapors displaced during transfer or filling operations by use of mechanical or chemical means.

Front 1234

Vapor Processing System

Back 1234

A system designed to capture and process vapors displaced during transfer or filling operations by use of mechanical or chemical means. [30, 2008]

Front 1235

Vapor-Protective Clothing

Back 1235

The garment portion of a chemical-protective clothing ensemble that is designed and configured to protect the wearer against chemical vapors or gases.

Front 1236

Vapor-Protective Ensemble

Back 1236

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 vapors.

Front 1237

Vapor-Protective Ensemble

Back 1237

Multiple elements of compliant protective clothing and equipment that when worn together provide protection from some risks, but not all risks, of vapor, liquid-splash, and particulate environments during hazardous materials incidents and from chemical and biological terrorism agents in vapor, gas, liquid, or particulate forms.

Front 1238

Vapor-Protective Ensemble with Optional Chemical Flash Fire Escape and Liquefied Gas Protection

Back 1238

A compliant vapor-protective ensemble that is also certified as compliant with the optional requirements for both limited protection against chemical flash fire for escape only and for protection against liquefied gases.

Front 1239

Vapor-Protective Ensemble with Optional Chemical Flash Fire Escape Protection

Back 1239

A compliant vapor-protective ensemble that is also certified as compliant with the optional requirements for limited protection against chemical flash fire for escape only.

Front 1240

Vapor-Protective Ensemble with Optional Liquefied Gas Protection

Back 1240

A compliant vapor-protective ensemble that is also certified as compliant with the optional requirements for protection against liquefied gases.

Front 1241

Vapor-Protective Footwear

Back 1241

The ensemble element of the protective ensemble that provides chemical protection and physical protection to the feet, ankles, and lower legs.

Front 1242

Vapor-Protective Gloves

Back 1242

The ensemble element of the protective ensemble that provides chemical protection to the hands and wrists.

Front 1243

Vapor-Protective Suit

Back 1243

The ensemble garment element of the protective ensemble that provides chemical protection to the upper and lower torso, head, arms, and legs.

Front 1244

Vapor Recovery

Back 1244

The process of reclaiming solvent by means of condensation or absorption.

Front 1245

Vapor Recovery System

Back 1245

A system designed to capture and retain, without processing, vapors displaced during transfer or filling operations.

Front 1246

Vapor Recovery System

Back 1246

A system designed to capture and retain, without processing, vapors displaced during transfer or filling operations. [30, 2008]

Front 1247

Vapor Resistant

Back 1247

Constructed so that gas or air is inhibited from entering or leaving except through vents or piping provided for the purpose.

Front 1248

Vapor Retarder

Back 1248

A layer of material or a laminate used to appreciably reduce the flow of water vapor into the roofing system. [ASTM D 1079: 2.1]

Front 1249

Vapor Scrubber

Back 1249

A device used to wash entrained dust from a vapor stream by means of a liquid spray.

Front 1250

Vapor Seal

Back 1250

Equipment or material that prevents the escape of solvent vapors from process equipment or conveyors.

Front 1251

Vapor Source

Back 1251

The liquid exposed in the process and on the drainboard. Also, any dipped or coated object from which it is possible to measure vapor concentrations exceeding 25 percent of the lower flammable limit at a distance of 305 mm (1 ft) in any direction from the object.

Front 1252

Vaportight

Back 1252

The ability of an enclosure or device to prevent the unintended release of flammable vapor at normal operating temperature and pressure ranges.

Front 1253

Variable Liquid Level Gauge

Back 1253

A device that indicates the liquid level in a container throughout a range of levels.

Front 1254

Variable Speed Pressure
Limiting Control

Back 1254

A speed control system used to limit the total discharge pressure by reducing the pump driver speed from rated speed.

Front 1255

Variance (Flood Resistance)

Back 1255

A grant of relief from a provision or provisions of this Code, which permits construction in a manner that would otherwise be prohibited.

Front 1256

Varying Duty

Back 1256

Operation at loads, and for intervals of time, both of which might be subject to wide variation.

Front 1257

Vault

Back 1257

An enclosed structure, usually underground, used to permit personnel access to various types of equipment and instrumentation.

Front 1258

Vault

Back 1258

An enclosure consisting of four walls, a floor, and a top for the purpose of containing a liquid storage tank and not intended to be occupied by personnel other than for inspection, repair, or maintenance of the vault, the storage tank, or related equipment.

Front 1259

Vault

Back 1259

A room constructed of iron, steel, brick, concrete, stone, tile, or similar masonry units permanently built into or assembled on the premises and having an iron, steel, or equivalent door and frame with a combination lock.

Front 1260

Vault

Back 1260

A specially constructed and equipped storage room with both a
4-hour fire rating and an inside volume that does not exceed 21 m3
(750 ft3).

Front 1261

Vault

Back 1261

A windowless enclosure of heavy, reinforced construction with walls, floor, roof, and door(s) designed and constructed to delay penetration sufficiently to enable the timely arrival of response forces.

Front 1262

Vault Door

Back 1262

A listed and labeled assembly that provides a specific degree of fire protection to the opening for the duration of the door’s rated exposure.

Front 1263

Vault Floor

Back 1263

The ground-supported slab or the slab between vaults in a tier.

Front 1264

Vault Roof

Back 1264

The ceiling or roof of a single vault and the ceiling or roof of the top vault of a tier, but not the slab between vaults in a tier, which is classified as a floor.

Front 1265

Vehicle

Back 1265

A device or structure for transporting persons or things; a conveyance.

Front 1266

Vehicle

Back 1266

A device or structure for transporting persons or things; a conveyance
(e.g., automobiles, trucks, marine vessels, railroad trains, and so forth).

Front 1267

Vehicle Fuel Dispenser

Back 1267

A device or system designed to transfer and measure LP-Gas into engine fuel and mobile containers on vehicles.

Front 1268

Vehicle Fueling Appliance
(VFA)

Back 1268

A listed, self-contained system that compresses natural gas, hydrogen, or a blend of the two, and dispenses it to a vehicles engine fueling system.

Front 1269

Vehicle/Person Extrication

Back 1269

The activity of removing a victim from a vehicle at the scene of an accident.

Front 1270

Vehicle Recovery Personnel

Back 1270

Personnel primarily responsible for the operation of vehicle recovery equipment and the removal of disabled competition vehicles and their components from the competition and adjacent areas.

Front 1271

Vehicle Safety Harness

Back 1271

A restraint device for vehicle occupants designed to limit their movement in the event of an accident, rapid acceleration, or rapid deceleration by securing individuals safely to a vehicle either in a seated position or tethered to the vehicle. (See also 3.3.86, Seat Belt.)

Front 1272

Vehicle Space

Back 1272

A space that is designed for the carriage of automobiles or other self-propelled vehicles.

Front 1273

Vehicle Space

Back 1273

Those spaces used for the carriage of vehicles with fuel in their tanks.

Front 1274

Vehicle Types

Back 1274

Vehicle types are designated as4× 4, and so forth, and these designations are used to indicate the number of wheels on the vehicle and the
number of wheels that propel or drive the vehicle.

Front 1275

Vehicular Fuel

Back 1275

Fuel stored on board a vehicle.

Front 1276

Vehicular Fuel Supply
Container

Back 1276

A container mounted on a vehicle to store LNG, CNG, LH2, or GH2 as the fuel supply to the vehicle.

Front 1277

Vehicular Way (Accessibility)

Back 1277

A route intended for vehicular traffic, such as a street, driveway, or parking lot.

Front 1278

Velocity Head (hv)

Back 1278

Figured from the average velicity (v) obtained by dividing the flow in cubic meters per second (cubic feet per second) by the actual area of pipe cross section in square meters (square feet) and determined at the point of the gauge connection.

Front 1279

Vendor Confirmation

Back 1279

A written statement by the original manufacturer of a component that states the specification or performance range, or both, of the component.

Front 1280

Veneered Wall

Back 1280

A wall having a facing of masonry, plastic, glass, or other material securely attached to the backing but not bonded to exert a common reaction under load.

Front 1281

Vent

Back 1281

A flue gas-conveying system intended for use only with certain gas, liquid, or pellet fuel-fired appliances that do not produce flue gas outlet temperatures higher than a value specified in the listing vent standards.

Front 1282

Vent

Back 1282

An opening for the passage of, or dissipation of, fluids, such as gases, fumes, smoke, and the like.

Front 1283

Vent

Back 1283

An opening in an enclosure to relieve the developing pressure from a deflagration.

Front 1284

Vent

Back 1284

A passageway used to convey flue gases from appliances or their vent connectors to the outdoors.

Front 1285

Vent

Back 1285

As used in this standard, a device or construction that, when activated, is an opening directly to the exterior at or near the roof level of a building that relies on the buoyant forces created by a fire to exhaust smoke and heat.

Front 1286

Vent Cap

Back 1286

A protective covering or housing attached to the vent termination, intended for preventing downdrafts and the entry of rain, snow, and animals.

Front 1287

Vent Closure

Back 1287

A pressure-relieving cover that is placed over a vent.

Front 1288

Vent Closure

Back 1288

A pressure-relieving cover that is placed over a vent. [68, 2002]

Front 1289

Vent Connector

Back 1289

The pipe or duct that connects a fuel gas burning appliance to a vent or chimney.

Front 1290

Vent Connector

Back 1290

The pipe that connects a fuel-burning appliance to a gas vent or Type
L vent.

Front 1291

Vent Control Valve

Back 1291

A controllable valve for regulating the flow of vented air or gas from the system.

Front 1292

Vented Appliance

Back 1292

An indirect-fired appliance provided with a flue collar to accommodate a venting system for conveying flue gases to the outside atmosphere.

Front 1293

Vented Battery

Back 1293

A battery in which the products of electrolysis and evaporation are allowed to escape freely to the atmosphere.

Front 1294

Vented Explosion Pressure
(Pred)

Back 1294

The maximum pressure developed in a vented enclosure during a vented deflagration.

Front 1295

Vented Flight Cylinder

Back 1295

A flight cylinder used in a hybrid rocket motor system that continuously vents a pressurized liquid or gas to the atmosphere during the motor fill and ignition procedures.

Front 1296

Vented Flight Cylinder

Back 1296

A flight cylinder used in a hybrid rocket motor system that continuously vents the pressurized liquid or gas to the atmosphere during the motor fill and ignition procedures.

Front 1297

Vented (Flooded)

Back 1297

A lead-acid battery consisting of cells that have electrodes immersed in liquid electrolyte.

Front 1298

Vented (Flooded)

Back 1298

A lead-acid battery consisting of cells that have electrodes immersed in liquid electrolyte. [1, 2003]

Front 1299

Vented (Flooded)

Back 1299

A lead-acid battery consisting of cells that have electrodes immersed in liquid electrolyte. Flooded lead-acid batteries may have a provision for the user to add water to the cell and are equipped with a
flame-arresting vent which permits the escape of hydrogen and oxygen gas from the cell in a diffused manner such that a spark, or other ignition source, outside the cell will not ignite the gases inside the cell.

Front 1300

Vented Gas Fireplace

Back 1300

A vented appliance that allows the view of flames and provides the simulation of a solid fuel fireplace.

Front 1301

Vented Wall Furnace

Back 1301

A self-contained, vented, fuel gas burning appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building and furnishing heated air, circulated by gravity or by a fan, directly into the space to be heated through openings in the casing.

Front 1302

Vent Fire

Back 1302

Provide building construction features and built-in equipment that can control fire by removal of the fire or fire products, or both.

Front 1303

Vent Gases

Back 1303

Products of combustion from appliances plus excess air, plus dilution air in the venting system above the draft hood or draft regulator.

Front 1304

Vent Gases

Back 1304

Products of combustion from fuel-burning appliances along with excess air, plus any dilution air in the venting system above a draft hood or draft regulator.

Front 1305

Ventilated

Back 1305

Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors.

Front 1306

Ventilated

Back 1306

Provided with a means to permit circulation of air sufficient to remove an excess of heat, fumes, or vapors. [70, 2008]

Front 1307

Ventilated

Back 1307

Provided with a means to permit circulation of air sufficient to remove excess heat, fumes, or vapors. [70:100]

Front 1308

Ventilated Equipment

Back 1308

Equipment, such as motors, that requires airflow for heat dissipation as well as pressurization to prevent entrance of flammable gases, vapors, or dusts.

Front 1309

Ventilation

Back 1309

As specified in this standard, movement of air that is provided for the prevention of fire and explosion. [30, 2003]

Front 1310

Ventilation

Back 1310

Circulation of air in any space by natural wind or convection or by fans blowing air into or exhausting air out of a building; a fire-fighting operation of removing smoke and heat from the structure by opening windows and doors or making holes in the roof.

Front 1311

Ventilation

Back 1311

For purposes of tank entry, cleaning, or repair, the introduction of air into a tank or container to maintain an atmosphere within acceptable limits and provide the required number of air changes per hour.

Front 1312

Ventilation

Back 1312

For the purpose of this code, movement of air that is provided for the prevention of fire and explosion.

Front 1313

Ventilation

Back 1313

For the purposes of this standard, movement of air that is provided for the prevention of fire and explosion and is sufficient to prevent accumulation of vapor-air mixtures in concentrations over 25 percent of the lower flammable limit.

Front 1314

Ventilation

Back 1314

The changing of air within a compartment by natural or mechanical means.

Front 1315

Ventilation

Back 1315

The changing of air within a compartment by natural or mechanical means. [302, 2004]

Front 1316

Ventilation

Back 1316

The changing of air within a compartment by natural or mechanical means. Ventilation can be achieved by introduction of fresh air to dilute contaminated air or by local exhaust of contaminated air. [302, 2004]

Front 1317

Ventilation Air

Back 1317

The portion of supply air whose source is the outside/outdoors plus any recirculated air that has been treated and is acceptable for use by the power system ventilation system.

Front 1318

Ventilation-Controlled Fire

Back 1318

A fire in which the heat release rate or growth is controlled by the amount of air available to the fire.

Front 1319

Ventilation Limited Fire

Back 1319

A fire where every object in the fire compartment is fully involved in fire and the heat release rate depends on the airflow through the openings to the fire compartment.

Front 1320

Ventilation Rate

Back 1320

A value based on the number of air changes per hour and calculated using 100 percent outside air for the supply air that is exhausted. The number of air changes per hour is calculated on the basis of the maximum aggregate volume (under normal operating conditions) of the space to be ventilated.

Front 1321

Venting

Back 1321

Removal of combustion products as well as noxious or toxic fumes to the outside atmosphere.

Front 1322

Venting

Back 1322

Removal of combustion products as well as process fumes to the outer air.

Front 1323

Venting

Back 1323

The escape of smoke and heat through openings in a building.

Front 1324

Venting System

Back 1324

A continuous open passageway from the flue collar or draft hood of
an appliance to the outdoors for the purpose of removing flue or vent
gases.

Front 1325

Venting System (Flue Gases)

Back 1325

A continuous, open passageway from the flue collar or draft hood of a fuel-burning appliance to the outside atmosphere for the purpose of removing flue gases.

Front 1326

Venting System (Flue Gases)

Back 1326

A continuous, open passageway from the flue collar or draft hood of a fuel-burning appliance to the outside atmosphere for the purpose of removing flue gases. [211, 2006]

Front 1327

Vent Limiter

Back 1327

A fixed orifice that limits the escape of gas from a vented device into the atmosphere.

Front 1328

Vent Offset

Back 1328

An arrangement of two or more fittings and pipe installed for the purpose of locating a vertical section of vent pipe in a different but parallel plane with respect to an adjacent section of vertical vent pipe.

Front 1329

Vent Plug

Back 1329

A part closing the filling hole that is also employed to permit the escape of gas.

Front 1330

Vent (Sliding Door, Vertical and
Horizontal Tin Clad Only)

Back 1330

A hole cut in a fire door to allow for venting of the products of combustion.

Front 1331

Vent System

Back 1331

A system used for the removal of smoke from a fire that utilizes manually or automatically operated heat and smoke vents at roof level and that exhausts smoke from a reservoir bounded by exterior walls, interior walls, or draft curtains to achieve the design rate of smoke mass flow through the vents, and that includes provision for makeup air.

Front 1332

Vent System (Waste)

Back 1332

A pipe or pipes installed to provide a flow of air to or from a waste drainage system to protect trap seals from siphonage and back pressure and to equalize the air pressure within the drainage system.

Front 1333

Vent, Type L

Back 1333

A vertical or nearly vertical passageway composed of listed factory-built components assembled in accordance with the terms of listing for conveying flue gases from oil and gas appliances or their vent connectors to the outside atmosphere.

Front 1334

Vent Valve

Back 1334

A normally open, power-closed valve, normally located between the two safety shutoff valves.

Front 1335

Vent Valve

Back 1335

A valve used to allow venting of air or gas from the system to the atmosphere.

Front 1336

Venue

Back 1336

The property, facility, building, or room within a building where flame effects are used, intended to be used, or are prohibited.

Front 1337

Venue Manager

Back 1337

An individual who has overall responsibility for the operation and management of the facility where pyrotechnics are to be used in a performance.

Front 1338

Verification

Back 1338

The process of determining the correctness of the calculations or the solution of governing equations in a method.

Front 1339

Verification Method

Back 1339

A procedure or process used to demonstrate or confirm that the proposed design meets the specified criteria.

Front 1340

Verification Method

Back 1340

A procedure or process used to demonstrate or confirm that the proposed design meets the specified criteria. [101, 2003]

Front 1341

Verification Method

Back 1341

A procedure or process used to demonstrate or confirm that the proposed design meets the specified criteria. [101, 2006]

Front 1342

Verification Method

Back 1342

A procedure or process used to demonstrate or confirm that the proposed design meets the specified criteria. [101, 2009]

Front 1343

Vertical Access Door

Back 1343

An access door installed in the vertical plane used to protect openings in fire-rated walls.

Front 1344

Vertical Circumference

Back 1344

One-piece garment measurement from junction of shoulder/collar seam down to the bottom of the crotch, and multiplied by 2 to obtain circumference.

Front 1345

Vertical Guide Pocket

Back 1345

A partial enclosure at the vertical edge of the proscenium that protects the vertical edges and guides of a fire safety curtain.

Front 1346

Vertical Lineshaft Turbine
Pump

Back 1346

A vertical shaft centrifugal pump with rotating impeller or impellers and with discharge from the pumping element coaxial with the shaft. The pumping element is suspended by the conductor system, which encloses a system of vertical shafting used to transmit power to the impellers, the prime mover being external to the flow stream.

Front 1347

Vertically Sliding Door

Back 1347

Labeled single-piece doors and sectional doors operating in a vertical direction.

Front 1348

Vertical Opening

Back 1348

An opening through a floor or roof.

Front 1349

Vertical Opening

Back 1349

An opening through a floor or roof. [101, 2003]

Front 1350

Vertical Opening

Back 1350

An opening through a floor or roof. [101, 2006]

Front 1351

Vertical Pipe

Back 1351

Any pipe or fitting that makes an angle of 45 degrees or less with the vertical.

Front 1352

Vertical Roll Paper Storage

Back 1352

Rolls stored with the cores in the vertical plane (on-end storage).

Front 1353

Vertical Stabilizer

Back 1353

That portion of the aircraft’s empennage that contains the rudder.

Front 1354

Vertical Tie

Back 1354

A tie intended to resist uplifting and overturning forces.

Front 1355

Vertical Zone

Back 1355

The area of a vessel between adjacent bulkheads.

Front 1356

Very Early Warning Fire Detection (VEWFD) Systems

Back 1356

Systems that detect low-energy fires before the fire conditions threaten telecommunications service.

Front 1357

Vessel

Back 1357

A container such as a barrel, drum, or tank for holding fluids or other material.

Front 1358

Vessel

Back 1358

Every description of watercraft or other artificial contrivance used or capable of being used as a means of transportation on water including special purpose floating structures not primarily designed for or used as a means of transportation on water.

Front 1359

Vessel

Back 1359

The general term for all craft capable of floating on water and larger than a rowboat.

Front 1360

Vibration Isolation

Back 1360

Isolation materials used to prevent structure-borne vibrations from reaching attached surfaces.

Front 1361

Victim Management

Back 1361

The manner of treatment given to those requiring rescue assistance.

Front 1362

Victim Removal System

Back 1362

Those systems used to move a victim to a safe location.

Front 1363

Video Image Flame Detection
(VIFD)

Back 1363

The principle of using automatic analysis of real-time video images to detect the presence of flame. (SIG-IDS)

Front 1364

Video Image Smoke Detection
(VISD)

Back 1364

The principle of using automatic analysis of real-time video images to detect the presence of smoke. (SIG-IDS)

Front 1365

Viewer

Back 1365

A viewing device installed in a door to allow observation of persons opposite the security side of the door without having to open the door.

Front 1366

Virgin Fiber

Back 1366

Fiber that is new and previously unused.

Front 1367

Viscosity

Back 1367

A measure of the resistance of a liquid to flow.

Front 1368

Visibility Markings

Back 1368

Retroreflective and fluorescent conspicuity enhancements. Retroreflective enhancements improve nighttime conspicuity, and fluorescent enhancements improvement daytime conspicuity.

Front 1369

Visibility Materials

Back 1369

Fluorescent and retroreflective materials used in the construction of garments to provide conspicuity for the purpose of providing both daytime and nighttime visibility of the wearer.

Front 1370

Visible Damage

Back 1370

A permanent change in condition that is clearly evident by visual inspection without recourse to optical measuring or observation devices.

Front 1371

Visible Damage

Back 1371

A permanent change in condition that is clearly evident by visual inspection without recourse to optical measuring or observation devices. [1931:3.3]

Front 1372

Visible Notification Appliance

Back 1372

A notification appliance that alerts by the sense of sight. (SIG-NAS)

Front 1373

Visible Smoke

Back 1373

The obscuration of transmitted light caused by combustion products released during the test.

Front 1374

Vision Panel

Back 1374

A glazing material installed in a fire door assembly to allow for viewing through the fire door assembly.

Front 1375

Visor Material

Back 1375

The transparent chemical-protective clothing material that allows the wearer to see outside the CBRN terrorism incident protective ensemble and ensemble elements.

Front 1376

Visor Material

Back 1376

The transparent chemical-protective material that allows the wearer to see outside the protective ensemble hood.

Front 1377

Visual Inspection

Back 1377

Inspection by the eye without recourse to any optical devices, except prescription eyeglasses.

Front 1378

Visual Inspection

Back 1378

Observation by eye unaided by optical devices, except prescription eyeglasses or lenses.

Front 1379

Visual Inspection

Back 1379

Observation by eye unaided by optical devices, except prescription eyeglasses or lenses. [1931:3.3]

Front 1380

Visual Inspection

Back 1380

The physical survey of the space or compartment and surroundings in order to identify potential atmospheric and fire hazards.

Front 1381

Vital Record

Back 1381

A record that is irreplaceable or that contains information for which temporary unavailability could constitute a serious legal or business impairment.

Front 1382

Vital Records

Back 1382

Records that are irreplaceable, such as records of which a reproduction does not have the same value as an original; records needed to sustain the business promptly or to recover monies used to replace buildings’ equipment, raw materials, finished goods, and work in progress; and records needed to avoid delay in restoration of production, sales, and service.

Front 1383

Voice Communication
Channel

Back 1383

A single path for communication by spoken word that is distinct from other parallel paths.

Front 1384

Voice Intelligibility

Back 1384

Audible voice information that is distinguishable and understandable. (SIG-NAS)

Front 1385

Voids

Back 1385

Cofferdams and spaces not normally accessible or used for storage.

Front 1386

VoIP, Voice over Internet
Protocol

Back 1386

Voice communication using internet protocol.

Front 1387

Volatile Flammable Liquid

Back 1387

A flammable liquid having a flash point below 38°C (100°F), or a flammable liquid whose temperature is above its flash point, or a Class II combustible liquid that has a vapor pressure not exceeding 276 kPa (40 psia) at 38°C (100°F) and whose temperature is above its flash point.

Front 1388

Volatile Liquid

Back 1388

A liquid that evaporates readily at normal temperature and pressure.

Front 1389

Volatile Matter

Back 1389

The portion of mass, except water vapor, that is driven off in a gaseous form when solid fuels are heated.

Front 1390

Voltage, Nominal

Back 1390

A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts,
480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment.

Front 1391

Voltage, Nominal

Back 1391

A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts,
480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment. [70:100]

Front 1392

Voltage, Nominal

Back 1392

A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts,
480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment. [70, 2008]

Front 1393

Voltage (of a circuit)

Back 1393

The greatest root-mean-square (rms) (effective) difference of potential between any two conductors of the circuit concerned.

Front 1394

Voltage (of a Circuit)

Back 1394

The greatest root-mean-square (rms) (effective) difference of potential between any two conductors of the circuit concerned. [70,
2008]

Front 1395

Voltage Protection Rating
(VPR)

Back 1395

A rating (or ratings) selected by the manufacturer based on the measured limiting voltage determined when the SPD is subjected to a combination waveform with an open circuit voltage of 6 kV and a short-circuit current of 3 kA . The value is rounded up to the next highest 100 V level.

Front 1396

Voltage to Ground

Back 1396

For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit.

Front 1397

Voltage to Ground

Back 1397

For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit. [70, 2008]

Front 1398

Volt (V)

Back 1398

The unit of electrical pressure (electromotive force) represented by the symbol “E”; the difference in potential required to make a current of one ampere flow through a resistance of one ohm.

Front 1399

Volume Control Damper

Back 1399

A fire damper, smoke damper, or combination fire/smoke damper that is also used to control the volume of air in an HVAC system.

Front 1400

Volumetric Method Filling

Back 1400

Filling a container to not more than the maximum permitted liquid volume.

Front 1401

Volunteer Fire Department

Back 1401

A fire department having volunteer emergency service personnel comprising 85 percent or greater of its department membership.

Front 1402

VRLA

Back 1402

Valve-regulated lead acid storage battery.

Front 1403

WAGD Interface

Back 1403

A device provided on the anesthesia gas machine that connects the
WAGD network to the patient breathing circuit. (PIP)

Front 1404

Waist

Back 1404

The area above the hips and below the xiphoid process.

Front 1405

Waist Circumference

Back 1405

A garment measurement from top edge of waistband from folded edge to folded edge, and multiplied by 2 to obtain circumference.

Front 1406

Wales

Back 1406

Also called walers or stringers; horizontal members of a shoring system placed parallel to the excavation face whose sides bear against the vertical members of a shoring system or earth.

Front 1407

Walk (Accessibility)

Back 1407

An exterior prepared surface for pedestrian use, including pedestrian areas such as plazas and courts.

Front 1408

Wall

Back 1408

A component that has a slope of 60 degrees or greater with the horizontal plane used to enclose or divide space. [ASCE/SEI 7:11.2]

Front 1409

Wall Furnace

Back 1409

A self-contained vented appliance, complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, manufactured home, or recreational vehicle and furnishing heated air directly into the space to be heated through openings in the casing.

Front 1410

Wall Furnace

Back 1410

A self-contained, vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, manufactured home, or recreational vehicle, and furnishing heated air directly into the space to be heated through openings in the casing. Such appliances should not be provided with duct extensions beyond the vertical and horizontal limits of the casing proper, except that boots not exceeding 10 in. (254 mm) beyond the horizontal of the casing for extension through walls of nominal thickness can be used. Where provided, such boots should be
supplied by the manufacturer as an integral part of the appliance. This definition excludes floor furnaces, unit heaters, and central furnaces.

Front 1411

Wall Head Adapter

Back 1411

A transition fitting for terminating plastic pipe inside of buildings at the building wall.

Front 1412

Wall Height

Back 1412

The vertical distance to the top of the wall measured from the foundation wall or from a girder or other immediate support of such wall.

Front 1413

Wall Hydrant

Back 1413

A hydrant mounted on the outside of a wall of a building, fed from interior piping, and equipped with control valves located inside the building that normally are key-operated from the building’s exterior.

Front 1414

Wall Panel

Back 1414

Nonbearing wall built between columns and piers wholly supported at each story.

Front 1415

Wall Protector (Shield)

Back 1415

Noncombustible surfacing applied to a wall area for the purpose of reducing the clearance between the wall and a heat-producing appliance.

Front 1416

Wall-to-Wall Turning Diameter

Back 1416

A measurement of the space that completely contains a vehicle as it is being turned.

Front 1417

Warehouse

Back 1417

A building used for long-term storage of commodities in contrast to temporary storage in container freight stations and transit sheds.

Front 1418

Warehouse

Back 1418

Any building or structure used exclusively for the storage of materials that are not used to manufacture model rocket motors or high power rocket motors.

Front 1419

Warehouse

Back 1419

Any building, structure, or portion thereof used for storage of pesticides.

Front 1420

Warm-Up Burner (in a
Fluidized Bed Boiler)

Back 1420

A burner having its own air supply used to warm up the bed to the ignition temperature of the main fuel. The warm-up burner also can be used for limited load carrying.

Front 1421

Warm-Up Burner (Warm-Up
Gun)

Back 1421

A burner, usually smaller than the main burner, that is ignited by another ignition source and is used to warm up the boiler. In cases where it is
used as an igniter, its classification shall be verified by test.

Front 1422

Warm Zone

Back 1422

The control area immediately outside the boundary of the established hot zone having a boundary that extends far enough from the hot zone to protect personnel outside the warm zone from the adverse effects of the fire.

Front 1423

Warm Zone

Back 1423

The control area immediately outside the boundary of the established hot zone having a boundary that extends far enough from the hot zone to protect personnel outside the warm zone from the adverse effects of the fire. [600, 2005]

Front 1424

Warm Zone

Back 1424

The control zone at a hazardous materials incident site where personnel and equipment decontamination and hot zone support takes place.

Front 1425

Warm Zone

Back 1425

The control zone at an incident that surrounds the hot zone and in which the fire fighter may be exposed to low levels of the products of combustion requiring standard fire fighter personal protective equipment for protection.

Front 1426

Warm Zone

Back 1426

The control zone at hazardous materials/weapons of mass destruction (WMD) incidents where personnel and equipment decontamination and hot zone support takes place.

Front 1427

Warm Zone

Back 1427

The control zone outside the hot zone where personnel and equipment decontamination and hot zone support takes place.

Front 1428

Warm Zone

Back 1428

The control zone outside the hot zone where personnel and equipment decontamination and hot zone support takes place. [1500, 2007]

Front 1429

Warp

Back 1429

The maximum distance any portion of a hose deviates from a straight line running from the center of the fitting at one end to a point on the center of the hose 50 ft (15 m) from that fitting, with the hose pressurized at its proof test pressure.

Front 1430

Warp Direction

Back 1430

In woven textiles, that direction on the roll of fabric that is parallel to the selvedges.

Front 1431

Warp Thread

Back 1431

The threads or yarns of a hose reinforcement that run lengthwise to the hose.

Front 1432

Wash

Back 1432

A slight slope or beveled edge on the top surface of a chimney designed to shed water away from the flue liner; also called a splay.

Front 1433

Waste Anesthetic Gas Disposal
(WAGD)

Back 1433

The process of capturing and carrying away gases vented from the patient breathing circuit during the normal operation of gas anesthesia or analgesia equipment. (PIP)

Front 1434

Waste Compactor

Back 1434

A device using electro-mechanical-hydraulic means to reduce the volume of waste and to package it in the reduced condition.

Front 1435

Waste Holding Tank

Back 1435

A liquid-tight tank for the temporary retention of body or liquid waste.

Front 1436

Waste Processing Systems and
Equipment

Back 1436

Devices and processes used to change the physical form or characteristics of waste.

Front 1437

Wastewater

Back 1437

The spent water of a community that is a combination of the liquid and water-carried wastes from residences, commercial buildings, industrial plants, and institutions, together with any groundwater, surface water, and storm water that might be present.

Front 1438

Watch-Dog Timer

Back 1438

A timer external to a microprocessor-based control that is used to compare the microprocessor cycle timing against itself and that fails safely if the microprocessor timing stops or exceeds the watch-dog time interval.

Front 1439

Water Additive

Back 1439

Any agent that, when added to water in proper quantities, suppresses, cools, mitigates fire and/or vapors, and/or provides insulating properties for fuels exposed to radiant heat or direct flame impingement.

Front 1440

Water Additive Concentrate

Back 1440

The chemical or chemical composition as received from the manufacturer.

Front 1441

Water Additive Solution

Back 1441

A homogeneous mixture of water and water additive concentrate.

Front 1442

Waterbath (or
Immersion-Type) Vaporizer

Back 1442

A vaporizer in which a vaporizing chamber, tubing, pipe coils, or
other heat exchange surface containing liquid LP-Gas to be vaporized
is immersed in a temperature-controlled bath of water, water-glycol
combination, or other noncombustible heat transfer medium that is
heated by an immersion heater not in contact with the LP-Gas heat
exchange surface.

Front 1443

Waterbath (or
Immersion-Type) Vaporizer

Back 1443

A vaporizer in which a vaporizing chamber, tubing, pipe coils, or
other heat exchange surface containing liquid LP-Gas to be vaporized
is immersed in a temperature-controlled bath of water, water-glycol
combination, or other noncombustible heat transfer medium that is
heated by an immersion heater not in contact with the LP-Gas heat
exchange surface. [58, 2008]

Front 1444

Waterbound Victim

Back 1444

A victim that is in the water needing assistance.

Front 1445

Water Capacity

Back 1445

The amount of water at 60°F (16°C) required to fill a container.

Front 1446

Water Capacity

Back 1446

The amount of water at 60°F (16°C) required to fill a container. [52,
2006]

Front 1447

Water Capacity

Back 1447

The amount of water at 60°F (16°C) required to fill a container. [58,
2008]

Front 1448

Water-Compatible

Back 1448

A material that is neither reactive with water nor incompatible with water and that, consequently, can be extinguished with a water-based extinguishing system.

Front 1449

Water Cooled Stoker

Back 1449

A stoker having tubes in or near the grate surface through which water is passed for cooling the grates.

Front 1450

Water-Cooling System for
Vacuum Furnaces

Back 1450

The apparatus, equipment and method used to cool vacuum chamber walls, electrical terminals, seals, workload, and the interior of the furnace where applicable.

Front 1451

Watercraft

Back 1451

All forms of boats and vessels up to 272 metric tons (300 gross tons) used for pleasure or commercial purposes, but excluding seaplanes, hovercraft, vessels with a cargo of flammable liquids, and submersible vessels.

Front 1452

Watercraft

Back 1452

Manned vessels that are propelled across the surface of a body of water by means of oars, paddles, water jets, propellers, towlines, or air cushions and are used to transport personnel and equipment while keeping their occupants out of the water.

Front 1453

Watercraft Conveyance

Back 1453

Devices intended for the purpose of transporting, moving, lifting, or lowering watercraft that may be required to be operated prior to and at the conclusion of every watercraft deployment.

Front 1454

Water Delivery Rate

Back 1454

The minimum amount of water per minute (in gpm or L/min), required by this standard or the AHJ, to be delivered to the fire scene via mobile water supply apparatus, hose lines, or a combination of both.

Front 1455

Water Dew Point

Back 1455

The temperature below which water in the combustion products will condense on exposed surfaces.

Front 1456

Water Distribution System

Back 1456

The potable water piping within or attached to the recreational vehicle.

Front 1457

Waterfall, Falls, Park Curtain

Back 1457

An effect of a cascade of sparks usually produced by multiple devices fired simultaneously.

Front 1458

Waterflow Alarm

Back 1458

A sounding device activated by a waterflow detector or alarm check valve.

Front 1459

Waterflow Alarm Device

Back 1459

An attachment to the sprinkler system that detects a predetermined water flow and is connected to a fire alarm system to initiate an alarm condition or is used to mechanically or electrically initiate a fire pump or local audible or visual alarm.

Front 1460

Waterflow Detector

Back 1460

An electric signaling indicator or alarm check valve actuated by waterflow in one direction only.

Front 1461

Water Gel

Back 1461

An explosive material that contains substantial portions of water, oxidizers, and fuel, plus a crosslinking agent.

Front 1462

Water Hammer

Back 1462

The surge of pressure caused when a high-velocity flow of water is abruptly shut off. The pressure exerted by the flowing water against the closed system can be seven or more times that of the static pressure.

Front 1463

Water Heater

Back 1463

A fuel-burning appliance for heating water to a temperature not more than 200°F (93°C).

Front 1464

Water Heater

Back 1464

A fuel-burning appliance for heating water to a temperature not more than 200°F (93°C). [211, 2006]

Front 1465

Water Heater

Back 1465

An appliance for supplying hot water for domestic or commercial purposes.

Front 1466

Water-Incompatible

Back 1466

A material that does not chemically react with water, but which undergoes a change of phase or state upon mixture with water that renders it permanently changed or incompatible with the remainder of the process.

Front 1467

Watermanship Skills

Back 1467

Capabilities that include swimming, surface diving, treading water, and staying afloat with a reasonable degree of comfort appropriate to the required task.

Front 1468

Watermanship Skills

Back 1468

Capabilities that include swimming, surface diving, treading water, and staying afloat with a reasonable degree of comfort appropriate to the required task. [1670, 2004]

Front 1469

Water-Miscible Liquid

Back 1469

A liquid that mixes in all proportions with water without the use of chemical additives, such as emulsifying agents.

Front 1470

Water Mist

Back 1470

A water spray for which the Dv0.99, for the flow-weighted cumulative volumetric distribution of water droplets, is less than 1000 microns at the minimum design operating pressure of the water mist nozzle.

Front 1471

Water Mist, Atomizing Media

Back 1471

Compressed air or other gases that produce water mist by mechanical mixing with water.

Front 1472

Water Mist Fire Extinguisher

Back 1472

A fire extinguisher containing distilled or de-ionized water and employing a nozzle that discharges the agent in a fine spray.

Front 1473

Water Mist Nozzle

Back 1473

A special purpose device, containing one or more orifices, designed to produce and deliver a water spray meeting either the definition of Water Mist or meeting the specific requirements of an approved water mist fire test protocol. (See Annex C.)

Front 1474

Water Mist System

Back 1474

A distribution system connected to a water supply or water and atomizing media supplies that is equipped with one or more nozzles capable of delivering water mist intended to control, suppress, or extinguish fires and that has been demonstrated to meet the performance requirements of its listing and this standard.

Front 1475

Water-Reactive

Back 1475

A material that chemically reacts with water, producing another compound that can represent a different set of fire protection concerns.

Front 1476

Water-Reactive Material

Back 1476

A material that explodes; violently reacts; produces flammable, toxic, or other hazardous gases; or evolves enough heat to cause self-ignition or ignition of nearby combustibles upon exposure to water or moisture.

Front 1477

Water-Reactive Material

Back 1477

A material that explodes; violently reacts; produces flammable, toxic, or other hazardous gases; or evolves enough heat to cause self-ignition or ignition of nearby combustibles upon exposure to water or moisture. [5000, 2009]

Front 1478

Water Rescue Personal
Protective Equipment

Back 1478

Personal equipment required to protect rescuers from physical dangers posed by exposure to in-water hazards and also those hazards that are associated with the climate and the adjacent area.

Front 1479

Water Rescue Rope

Back 1479

Rope that floats, has adequate strength for anticipated use, is not weakened to the point of inadequacy for the task by saturation or immersion in water, and is of sufficient diameter to be gripped by bare wet hands.

Front 1480

Water Riser Pipe

Back 1480

That portion of the water system serving the recreational vehicle, recreational park trailer, and/or other camping unit site that extends from the water supply main through a lateral branch and terminates at a water connection.

Front 1481

Water Sensor

Back 1481

A device or means that will detect the presence of water.

Front 1482

Water Service Connection

Back 1482

The fitting or point of connection of the vehicle water distribution system designed for connection to a potable water supply.

Front 1483

Water Spray

Back 1483

Water in a form having a predetermined pattern, particle size, velocity, and density discharge from specially designed nozzles or devices.

Front 1484

Water Spray

Back 1484

Water in a form having a predetermined pattern, particle size, velocity, and density discharge from specially designed nozzles or devices. [15, 2007]

Front 1485

Water Spray Fixed System

Back 1485

A special fixed pipe system connected to a reliable fire protection water supply and equipped with water spray nozzles for specific water discharge and distribution over the surface or area to be protected. The piping system is connected to the water supply through an automatically or manually actuated valve that initiates the flow of water. An automatic valve is actuated by operation of automatic detection equipment installed in the same areas as the water spray nozzles. (In special cases, the automatic detection system also is located in another area.)

Front 1486

Water Spray Nozzle

Back 1486

An open or automatic water discharge device that, when discharging water under pressure, will distribute the water in a specific, directional pattern.

Front 1487

Water Spray System

Back 1487

An automatic or manually actuated fixed pipe system connected to a water supply and equipped with water spray nozzles designed to provide a specific water discharge and distribution over the protected surfaces or area.

Front 1488

Water Supply

Back 1488

A source of water for fire-fighting activities.

Front 1489

Water Supply

Back 1489

A source of water for fire suppression activities.

Front 1490

Water Supply

Back 1490

A source of water that provides the flows [gal/min (L/min)] and pressures [psi (bar)] required by the water-based fire protection system.

Front 1491

Water Supply Flow

Back 1491

The sustained water supply capacity available for a period of 1 hour to apparatus on the first alarm.

Front 1492

Water Supply Officer (WSO)

Back 1492

The fire department officer or designee responsible for providing water for fire-fighting purposes.

Front 1493

Water Supply Station

Back 1493

A facility for supplying potable water.

Front 1494

Water-Surrounded Structure

Back 1494

A structure fully surrounded by water.

Front 1495

Water Tank

Back 1495

A tank supplying water for water-based fire protection systems.

Front 1496

Watertight

Back 1496

Constructed so that moisture will not enter the enclosure under specified test conditions.

Front 1497

Watertight

Back 1497

So constructed that water does not enter the enclosure under test conditions specified in NEMA/ANSI 250-6, Enclosures for Electrical Equipment (1000 Volts Maximum).

Front 1498

Watertight Bulkhead

Back 1498

A bulkhead (wall) strengthened and sealed to form a barrier against flooding in the event that the area on one side fills with liquid.

Front 1499

Watertight Door

Back 1499

A door that is designed to keep water out.

Front 1500

Watertight Transverse
Bulkhead

Back 1500

A bulkhead through which there are no openings and that extends from the tank top up to the main deck, built to control flooding.

Front 1501

Water Tower

Back 1501

An aerial device consisting of permanently mounted power-operated booms and a waterway designed to supply a large capacity mobile elevated water stream. The booms can be of articulating design or telescoping design. [1901, 2003]

Front 1502

Water Tower

Back 1502

An aerial device consisting of permanently mounted power-operated booms that articulate, telescope, or both, and a waterway designed to supply a large capacity mobile elevated water stream.

Front 1503

Water-Type Fire Extinguisher

Back 1503

A fire extinguisher containing water-based agents, such as water, AFFF, FFFP, antifreeze, and loaded stream.

Front 1504

Water Vapor Retarder

Back 1504

Material or construction that adequately impedes the transmission of water vapor under specified conditions. Water vapor retards have a water vapor permeance of less than 1.0 perm when tested in accordance with ASTM E 96.

Front 1505

Water-Wash Spray Booth

Back 1505

A spray booth that is equipped with a water-washing system designed to minimize the concentrations of dusts or residues entering exhaust ducts and to permit the collection of the dusts or residues.

Front 1506

Water Wastage

Back 1506

That discharge from water spray nozzles that does not impinge on the surface being protected.

Front 1507

Water-Wet Nitrocellulose

Back 1507

A fibrous, granular, cubed, or flake-like nitrocellulose wetted with not less than 25 percent by weight water.

Front 1508

WATS (Wide Area Telephone
Service)

Back 1508

Telephone company service allowing reduced costs for certain telephone call arrangements. In-WATS or 800-number service calls can be placed from anywhere in the continental United States to the called party at no cost on to the calling party. Out-WATS is a service whereby, for a flat-rate charge, dependent on the total duration of all such calls, a subscriber can make an unlimited number of calls within a prescribed area from a particular telephone terminal without the registration of individual call charges. (SIG-SSS)

Front 1509

Watt (W)

Back 1509

Unit of power, or rate of work, equal to one joule per second, or the rate of work represented by a current of one ampere under the potential of one volt.

Front 1510

Watt (W)

Back 1510

Unit of power, or rate of work, equal to one joule per second, or the rate of work represented by a current of one ampere under the potential of one volt. [921, 2008]

Front 1511

Wavelength

Back 1511

The distance between the peaks of a sinusoidal wave. All radiant energy can be described as a wave having a wavelength. Wavelength serves as the unit of measure for distinguishing between different parts of the spectrum. Wavelengths are measured in microns (µm), nanometers (nm), or angstroms (Å). (SIG-IDS)

Front 1512

Weapon of Mass Destruction
(WMD)

Back 1512

(1) Any destructive device, such as any explosive, incendiary, or
poison gas bomb, grenade, rocket having a propellant charge of more
than four ounces, missile having an explosive or incendiary charge of
more than one quarter ounce (7 grams), mine, or device similar to
the above; (2) any weapon involving toxic or poisonous chemicals; (3)
any weapon involving a disease organism; or (4) any weapon that is
designed to release radiation or radioactivity at a level dangerous to
human life.

Front 1513

Weapons of Mass Destruction
(WMD)

Back 1513

A WMD is any device, material, or substance used in a manner, in a quantity or type, or under circumstances evidencing an intent to cause death or serious injury to persons or significant damage to
property. A weapon of mass destruction includes chemical, biological, radiological, nuclear, and explosive components.

Front 1514

Wear Surface

Back 1514

A footwear term for the bottom of the sole, including the heel.

Front 1515

Wear Surface

Back 1515

The bottom of the footwear sole, including the heel.

Front 1516

Weather Deck

Back 1516

Any deck that is exposed to the weather and normally accessible to personnel and that permits walking or moving around outboard of the superstructure.

Front 1517

Weather Deck

Back 1517

Any deck that is exposed to the weather and normally accessible to personnel and that permits walking or moving around outboard of the superstructure. [1925, 2004]

Front 1518

Weathered-Membrane
Material

Back 1518

Membrane material that has been subjected to a minimum of 3000 hours in a weatherometer in accordance with ASTM G 155, Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of
Non-Metallic Materials, or approved equivalent.

Front 1519

Weathered-Membrane
Material

Back 1519

Membrane material that has been subjected to a minimum of 3000 hours in a weatherometer in accordance with ASTM G 155, Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of
Non-Metallic Materials, or approved equivalent. [5000, 2006]

Front 1520

Weathered-Membrane
Material

Back 1520

Membrane material that has been subjected to a minimum of 3000 hours in a weatherometer in accordance with ASTM G 155, Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of
Non-Metallic Materials, or approved equivalent. [5000:3.3]

Front 1521

Weather-Exposed Surface

Back 1521

The surface of walls, ceilings, roofs, soffits, and similar surfaces exposed to the weather.

Front 1522

Weatherproof

Back 1522

Constructed or protected so that exposure to the weather does not interfere with successful operation.

Front 1523

Weatherproof

Back 1523

Constructed or protected so that exposure to the weather will not interfere with successful operation.

Front 1524

Weather Resistant

Back 1524

Construction designed to offer protection against weather.

Front 1525

Weather Resistant

Back 1525

Sufficiently protected to prevent the penetration of rain, snow, and wind-driven sand, dirt, or dust under all operating conditions.

Front 1526

Weathertight Door

Back 1526

Door that prevents the penetration of rain, snow, wind-driven spray, and water on deck into the interior spaces.

Front 1527

Webbing

Back 1527

Woven material in the form of a long strip; can be of flat or tubular weave.

Front 1528

Webbing

Back 1528

Woven material of flat or tubular weave in the form of a long strip.

Front 1529

Wedges and Shims

Back 1529

Material used to tighten or adjust cribbing and shoring systems.

Front 1530

Wedge (Sliding Door, Horizontal Tin Clad and Flush Sheet Metal)

Back 1530

A plate mounted on the face of a sliding door designed to force the door against the wall.

Front 1531

Weft Thread

Back 1531

The threads or yarns of a hose reinforcement that are helically wound throughout the length of the hose at approximately right angles to
the warp threads.

Front 1532

Weight Method Filling

Back 1532

Filling containers to not more than the maximum permitted filling limit by weighing the LP-Gas in the container.

Front 1533

Weight Scale Measurement

Back 1533

The accurate measurement of vehicle weight by means of a scale to verify or check a stated or estimated weight.

Front 1534

Welding and Allied Processes

Back 1534

Processes such as arc welding, oxy-fuel gas welding, open-flame soldering, brazing, thermal spraying, oxygen cutting, and arc cutting.

Front 1535

Welding Blanket

Back 1535

A heat-resistant fabric designed to be placed in the vicinity of a hot work operation. Intended for use in horizontal applications with light to moderate exposures such as that resulting from chipping, grinding, heat treating, sand blasting, and light horizontal welding. Designed to protect machinery and prevent ignition of combustibles such as wood that are located adjacent to the underside of the blanket.

Front 1536

Welding Curtain

Back 1536

A heat-resistant fabric designed to be placed in the vicinity of a hot work operation. Intended for use in vertical applications with light to moderate exposures such as that resulting from chipping, grinding, heat treating, sand blasting, and light horizontal welding. Designed to prevent sparks from escaping a confined area.

Front 1537

Welding Pads

Back 1537

A heat-resistant fabric designed to be placed directly under a hot work operation such as welding or cutting. Intended for use in horizontal applications with severe exposures such as that resulting from molten substances or heavy horizontal welding. Designed to prevent the ignition of combustibles that are located adjacent to the underside of the pad.

Front 1538

Weldment

Back 1538

A structure that is formed by the welding together of several components.

Front 1539

Welt

Back 1539

The cord or piping sewn into the seam or border edge of a cushion, pillow, arm, or back of a furniture item.

Front 1540

Wet Barrel Hydrant

Back 1540

A type of hydrant that sometimes is used where there is no danger of freezing weather. Each outlet on a wet barrel hydrant is provided with a valved outlet threaded for fire hose.

Front 1541

Wet Barrel Hydrant

Back 1541

A type of hydrant that sometimes is used where there is no danger of freezing weather. Each outlet on a wet barrel hydrant is provided with a valved outlet threaded for fire hose. [24, 2007]

Front 1542

Wet Chemical

Back 1542

Normally an aqueous solution of organic or inorganic salts or a combination thereof that forms an extinguishing agent.

Front 1543

Wet Chemical

Back 1543

Normally an aqueous solution of organic or inorganic salts or a combination thereof that forms an extinguishing agent.
[17A, 2002]

Front 1544

Wet Location

Back 1544

A nonsheltered location inside a compartment with a door or cover that, while open, exposes the electrical enclosure or panelboard to the same environmental conditions as the exterior of the fire apparatus. A location on a nonenclosed, exterior surface of a fire apparatus body or driving and crew compartment where the enclosure or panel is exposed to the environment. (See also 3.3.154, Road Spray Location.)

Front 1545

Wet Location

Back 1545

Installations underground or in concrete slabs or masonry in direct contact with the earth; and in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather. [70:100]

Front 1546

Wet Locations

Back 1546

The area in a patient care area where a procedure is performed that is normally subject to wet conditions while patients are present
including standing fluids on the floor or drenching of the work area, either of which condition is intimate to the patient or staff. (ADM)

Front 1547

Wet-Niche Luminaire

Back 1547

A luminaire intended for installation in a forming shell mounted in a pool or fountain structure where the luminaire will be completely surrounded by water.

Front 1548

Wet Pipe Sprinkler System

Back 1548

A sprinkler system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat from a fire.

Front 1549

Wet Pipe Sprinkler System

Back 1549

A sprinkler system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat from a fire. [13, 2007]

Front 1550

Wet Pipe Water Mist System

Back 1550

A water mist system using automatic nozzles attached to a piping system containing water and connected to a water supply so that water discharges immediately from nozzles operated by the heat from a fire.

Front 1551

Wet Pit

Back 1551

A timber, concrete, or masonry enclosure having a screened inlet kept partially filled with water by an open body of water such as a pond, lake, or stream.

Front 1552

Wet Standpipe System

Back 1552

A standpipe system having piping containing water at all times.

Front 1553

Wet Standpipe System

Back 1553

A standpipe system having piping containing water at all times. [14, 2007]

Front 1554

Wet Storage

Back 1554

Storage of a boat afloat in a partly or completely laid-up status.

Front 1555

Wetting Ability

Back 1555

The ability of foam solution to penetrate and soak into a solid.

Front 1556

Wetting Ability

Back 1556

The ability of solution to penetrate and soak into a solid. [1150, 2004]

Front 1557

Wetting Agent

Back 1557

A concentrate which, when added to water reduces the surface tension and increases its ability to penetrate and spread.

Front 1558

Wetting Agent

Back 1558

A concentrate which, when added to water reduces the surface tension and increases its ability to penetrate and spread. [18, 2006]

Front 1559

Wetting Agent Solution

Back 1559

Water to which a wetting agent has been added.

Front 1560

Wet Vent

Back 1560

A vent that also serves as a drain for one or more fixtures.

Front 1561

Wet Well

Back 1561

The portion of the pumping station that receives and temporarily stores wastewater for the purpose of pumping.

Front 1562

Wharf

Back 1562

A structure at the shoreline that has a platform built along and parallel to a body of water with either an open deck or a superstructure.

Front 1563

Wharf

Back 1563

A structure at the shoreline that has a platform built along and parallel to a body of water with either an open deck or a superstructure. [307, 2006]

Front 1564

Wheel

Back 1564

A pyrotechnic device that rotates on a central axis consisting of multiple gerbs or rockets attached to a framework.

Front 1565

Wheelchair Space
(Accessibility)

Back 1565

The space for a single wheelchair and its occupant.

Front 1566

Wheeled Fire Extinguisher

Back 1566

A portable fire extinguisher equipped with a carriage and wheels intended to be transported to the fire by one person. (See A.5.3.2.7.)

Front 1567

Where Specified

Back 1567

Options selected by the purchaser beyond the minimum requirements of the standard.

Front 1568

Whistle Composition

Back 1568

A pyrotechnic composition that when pressed into a tube with an open end burns in an oscillatory manner to produce an audible effect.

Front 1569

Wide Area Signaling

Back 1569

Signaling intended to provide alerting or information to exterior open spaces, such as campuses, neighborhood streets, a city, a town, or a community. (SIG-NAS)

Front 1570

Wilderness

Back 1570

An uncultivated, uninhabited, and natural area usually, but not necessarily, far from human civilization and trappings.

Front 1571

Wildland

Back 1571

Land in an uncultivated, more or less natural state and covered by timber, woodland, brush, and/or grass.

Front 1572

Wildland Fire

Back 1572

An unplanned and uncontrolled fire burning in vegetation, including any structures or other improvements thereon.

Front 1573

Wildland Fire

Back 1573

An unplanned and uncontrolled fire spreading through vegetative fuels, at times involving structures.

Front 1574

Wildland Fire

Back 1574

An unplanned and uncontrolled fire spreading through vegetative fuels, at times involving structures, including any structures or other improvements thereon.

Front 1575

Wildland Fire

Back 1575

An unplanned fire burning in vegetative fuels.

Front 1576

Wildland Fire Apparatus

Back 1576

Fire apparatus designed for fighting wildland fires that is equipped with a pump having a capacity normally between 10 gpm and 500 gpm (38 L/min and 1900 L/min), a water tank, limited hose and equipment, and that has pump-and-roll capability.

Front 1577

Wildland Fire Apparatus

Back 1577

Fire apparatus designed for fighting wildland fires that is equipped with a pump having a capacity normally between 10 gpm and 500 gpm (38 L/min and 1900 L/min), a water tank, limited hose and equipment, and that has pump-and-roll capability. [1906, 2006]

Front 1578

Wildland Fire Apparatus

Back 1578

Fire apparatus designed for fighting wildland fires that is equipped with a pump having a capacity normally between 38 L/min and 1900
L/min (10 gpm and 500 gpm), a water tank, limited hose and equipment, and that has pump and roll capability. [1906, 2006]

Front 1579

Wildland Fire Fighter I

Back 1579

The person at the first level of progression who has demonstrated the knowledge and skills necessary to function safely as a member of a wildland fire suppression crew under direct supervision.

Front 1580

Wildland Fire Fighter II

Back 1580

The person at the second level of progression who has demonstrated the skills and depth of knowledge necessary to function under general supervision.

Front 1581

Wildland Fire Fighting

Back 1581

The activities of fire suppression and property conservation in woodlands, forests, grasslands, brush, prairies, and other such vegetation, or any combination of vegetation, that is involved in a fire situation but is not within buildings or structures.

Front 1582

Wildland Fire Fighting

Back 1582

The activities of fire suppression and property conservation in woodlands, forests, grasslands, brush, prairies, and other such vegetation, or any combination of vegetation, that is involved in a fire situation but is not within buildings or structures. [1977, 2005]

Front 1583

Wildland Fire Fighting Chain
Saw Protection

Back 1583

Items of protective equipment that provides protection to the legs, or to the lower torso and legs, excluding the ankles and feet.

Front 1584

Wildland Fire Fighting Protective Clothing and Equipment

Back 1584

Items of compliant protective clothing and equipment products that provide protection from some risks, but not all risks, of emergency incident operations.

Front 1585

Wildland Fire Fighting Protective Cold Weather Outerwear

Back 1585

Items of protective clothing that provides protection to the upper or lower torso, arms, and legs to provide insulation for warmth of the wearer during cold weather.

Front 1586

Wildland Fire Fighting Protective Face/Neck Shroud

Back 1586

Items of protective clothing that provides protection to the face and neck area.

Front 1587

Wildland Fire Fighting
Protective Footwear

Back 1587

Items of protective clothing that provides protection to the foot, ankle, and lower leg.

Front 1588

Wildland Fire Fighting
Protective Garments

Back 1588

Items of protective clothing that provide protection to the wearer’s upper or lower torso, excluding the hands, face, and feet.

Front 1589

Wildland Fire Fighting
Protective Gloves

Back 1589

Items of protective clothing that provides protection to the hands and wrists.

Front 1590

Wildland Fire Fighting
Protective Goggles

Back 1590

Items of protective equipment that provides protection to the eyes and a portion of the face.

Front 1591

Wildland Fire Fighting
Protective Helmet

Back 1591

Items of protective equipment that provides protection to the head.

Front 1592

Wildland Fire Fighting
Protective Jacket

Back 1592

The protective outer garment item that provides protection to the upper torso and arms, excluding the hands and head.

Front 1593

Wildland Fire Fighting Protective Load Carrying Equipment

Back 1593

Items of protective equipment that are worn by the wildland fire fighter to facilitate the carrying of gear.

Front 1594

Wildland Fire Fighting Protective One-Piece Garment

Back 1594

The single-piece protective garment item that provides protection to the upper and lower torso, arms, and legs, excluding the head, hands, and feet.

Front 1595

Wildland Fire Fighting
Protective Shirt

Back 1595

A protective garment item that provides protection to the upper torso and arms, excluding the head and hands.

Front 1596

Wildland Fire Fighting
Protective Trousers

Back 1596

A protective garment item that provides protection to the lower torso and legs, excluding the feet.

Front 1597

Wildland Fire Officer I

Back 1597

The person responsible for supervising and directing a single wildland fire suppression resource, such as a hand crew or an engine.

Front 1598

Wildland Fire Officer II

Back 1598

The person responsible for commanding and managing resources in the suppression of all aspects of an extended attack wildland fire or an initial attack exceeding the capability of the Wildland Fire Officer I.

Front 1599

Wildland/Urban Interface

Back 1599

Locations in which the AHJ determines that topographical features, vegetation fuel types, local weather conditions, and prevailing winds result in the potential for ignition of the structures within the area from flames and firebrands of a wildland fire.

Front 1600

Wildland/Urban Interface

Back 1600

The line, area, or zone where structures and other human development meet or intermingle with undeveloped wildland or vegetative fuels.

Front 1601

Wildland/Urban Interface

Back 1601

The location where humans and their development meet or are intermixed with wildland fuels.

Front 1602

Wildland/Urban Interface

Back 1602

The presence of structures in locations in which the AHJ determines that topographical features, vegetation fuel types, local weather conditions, and prevailing winds result in the potential for ignition of the structures within the area from flames and firebrands of a wildland fire.

Front 1603

Wildland/Urban Interface

Back 1603

The presence of structures in locations in which the AHJ determines that topographical features, vegetation fuel types, local weather conditions, and prevailing winds result in the potential for ignition of the structures within the area from flames and firebrands of a wildland fire. [1144,
2008]

Front 1604

Wildland/Urban Interface
Coordinator

Back 1604

The person responsible for development of the plan(s) for the reduction of the fire risks and hazards associated in the wildland/urban interface.

Front 1605

Wildland/Urban Interface
Coordinator

Back 1605

The person responsible for the development of the plan(s) for the reduction of the fire risks and hazards associated in the wildland/urban interface. [1051, 2007]

Front 1606

Wildland/Urban Interface
Protection Specialist

Back 1606

The person responsible for the development and/or implementation of a plan to protect people, animals, communities, individual structures or other improvements from a wildland fire.

Front 1607

Wildland/Urban Interface
Protection Specialist

Back 1607

The person responsible for the development and/or implementation of a plan to protect people, animals, communities, individual structures, or other improvements from a wildland fire. [1051, 2007]

Front 1608

Wildland/Urban Intermix

Back 1608

An area where improved property and wildland fuels meet with no clearly defined boundary.

Front 1609

Wildland/Urban Intermix

Back 1609

An area where improved property and wildland fuels meet with no clearly defined boundary. [1144, 2008]

Front 1610

Winch

Back 1610

A stationary, motor-driven hoisting machine having a drum around which a rope or chain winds as the load is lifted.

Front 1611

Windlass

Back 1611

A mechanical device utilized in the recovery of anchor and chain by vessels following anchoring operations.

Front 1612

Wind/Moisture Barrier

Back 1612

A component of a protective garment designed to inhibit wind penetration and prevent the penetration of liquid water.

Front 1613

Window

Back 1613

Integral fabricated units, placed in an opening in a wall, primarily intended for the admission of light, or light and air, and not intended primarily for human entrance or exit.

Front 1614

Window Assembly

Back 1614

An integral, fabricated unit that contains a glazed light(s) placed in an opening in a wall and that is intended primarily for the transmission of light or of light and air and not primarily for human entrance or exit.

Front 1615

Window Frame

Back 1615

The perimeter of a window.

Front 1616

Window Mullion

Back 1616

The separate horizontal or vertical member or members used to join windows in a multiple window opening.

Front 1617

Window Muntin

Back 1617

A tee-shaped bar in a frame or ventilator, dividing the glass.

Front 1618

Window Plume

Back 1618

A plume that flows out of an opening to a room or other compartment that is involved in a ventilation limited fire.

Front 1619

Window Sash

Back 1619

The horizontal or vertical sliding component of a window.

Front 1620

Window Ventilator

Back 1620

The part of a projected window, casement window, or pivoted window that opens.

Front 1621

Wing Area

Back 1621

Total projected area of clean wing (no projecting flaps, slats, and similar items) including all control surfaces and area of the fuselage bounded by the leading and trailing edges projected to the centerline (inapplicable to slender-delta aircraft with extremely large
leading-edge sweep-angle). Net area excludes projected areas of fuselage, nacelles, and similar items.

Front 1622

Winter Liner

Back 1622

An optional component layer that provides added insulation against cold.

Front 1623

Wire

Back 1623

A factory assembly of one or more insulated conductors without an overall covering.

Front 1624

Wired Circuit

Back 1624

A metallic circuit leased to or owned by a jurisdiction, which is dedicated to a specific alarm or communication system under the control of that jurisdiction.

Front 1625

Wired Glass

Back 1625

A glazing material with embedded wire mesh.

Front 1626

Wire Glazing Clips

Back 1626

Small, spring wire clips used to hold glass in place where windows are glazed only with glazing compound.

Front 1627

Wireless Control Unit

Back 1627

A component that transmits/receives and processes wireless signals. (SIG-PRO)

Front 1628

Wireless Control Unit

Back 1628

See 3.3.39, Control Unit.

Front 1629

Wireless Protection System

Back 1629

A system or a part of a system that can transmit and receive signals without the aid of interconnection wiring. It can consist of either a wireless control unit or a wireless repeater. (SIG-PRO)

Front 1630

Wireless Repeater

Back 1630

A component used to relay signals among wireless devices, appliances, and control units. (SIG-PRO)

Front 1631

Wire Rope

Back 1631

Rope made of twisted strands of wire.

Front 1632

Wireway

Back 1632

A sheet-metal or flame-retardant nonmetallic trough with hinged or removable covers for housing and protecting electric wires and cable and in which conductors are laid in place after the wireway has been installed as a complete system.

Front 1633

Wood

Back 1633

The cellulosic material derived from trees, and other cellulosic materials including, but not limited to, wheat straw, flax, bagasse, coconut shells, corn stalks, hemp, rice hulls, and paper or other cellulosic fiber used as a substitute or additive to wood.

Front 1634

Wood-Derived Materials

Back 1634

These materials include but are not limited to sawdust, sanderdust, planer shavings, hoggings, wood flour, and moulder waste.

Front 1635

Wood Irregularities

Back 1635

Natural characteristics in or on the wood that can lower its durability, strength, or utility.

Front 1636

Wood Pallet

Back 1636

A pallet constructed entirely of wood with metal fasteners.

Front 1637

Wood Panel

Back 1637

Board or sheet made from veneers, particles, or fibers of wood and includes plywood, oriented strandboard, and similar wood products.

Front 1638

Wood Structural Panel

Back 1638

A panel manufactured from veneers; or wood strands or wafers; or a combination of veneer and wood strands or wafers bonded together with waterproof synthetic resins or other suitable bonding systems, including composite panels, oriented strand board, and plywood.

Front 1639

Work

Back 1639

Activities performed on tanks and containers in accordance with this document; including, but not limited to, safeguarding, repair, hot work, cleaning, change of service, maintenance, inspection, and transportation.

Front 1640

Work

Back 1640

Activities performed on tanks and containers in accordance with this standard including, but not limited to, safeguarding, repair, hot work, cleaning, change of service, maintenance, inspection, and transportation.

Front 1641

Work Area Equipment
(Accessibility)

Back 1641

For the purposes of this Code, any machine, instrument, engine, motor, pump, conveyor, or other apparatus used to perform work that is permanently installed or built-in within employee work areas, not including passenger elevators and other accessible means of vertical transportation.

Front 1642

Work Glove

Back 1642

An abbreviated term for emergency medical work glove. (See also 3.3.34, Emergency Medical Work Glove.)

Front 1643

Working Length

Back 1643

The length of a non-self-supporting portable ladder measured along the beams from the base support point of the ladder to the point of bearing at the top.

Front 1644

Working On (energized electrical conductors or circuit parts)

Back 1644

Coming in contact with energized electrical conductors or circuit parts with the hands, feet, or other body parts, with tools, probes, or with test equipment, regardless of the personal protective equipment a person is wearing. There are two categories of “working on”: Diagnostic (testing) is taking readings or measurements of electrical equipment with approved test equipment that does not require making any physical change to the equipment; repair is any physical alteration of electrical equipment (such as making or tightening connections, removing or replacing components, etc.).

Front 1645

Working Pressure

Back 1645

A pressure not exceeding 11.6 kg/cm2 (200 psig). (GAS)

Front 1646

Working Pressure

Back 1646

The maximum allowable pressure, including momentary surge pressure, to which a system, hose, or other component can be safely subjected while in service.

Front 1647

Working Pressure

Back 1647

The maximum anticipated static (nonflowing) pressure applied to the system components exclusive of surge pressures.

Front 1648

Working Pressure

Back 1648

The maximum filter pump discharge pressure.

Front 1649

Work Plans

Back 1649

An outline of the tasks to be completed as part of the investigation including the order or timeline for completion. See Chapter 14, Planning the Investigation.

Front 1650

Workstation

Back 1650

A defined space or an independent, principal piece of equipment using hazardous chemicals within a cleanroom or clean zone, where a specific function, a laboratory procedure, or a research activity occurs.

Front 1651

Workstation

Back 1651

A defined space or an independent, principal piece of equipment using hazardous chemicals within a cleanroom or clean zone, where a specific function, a laboratory procedure, or a research activity occurs. [318, 2006]

Front 1652

Worst-Case

Back 1652

The maximum concentration, pressure, temperature, or flow-rate that can occur with a reasonable single-point failure or upset.

Front 1653

Wrapped Roll Paper Storage

Back 1653

Rolls provided with a complete heavy kraft covering around both sides and ends.

Front 1654

Wristlet

Back 1654

The circular, close-fitting extension of the coat sleeve, usually made of knitted material.

Front 1655

Wristlet

Back 1655

The interface component of the protective element or item that provides limited protection to the coat/glove interface area.

Front 1656

Wristlet

Back 1656

The interface component of the protective element or item that provides limited protection to the protective coat/glove interface area.

Front 1657

Written Notice

Back 1657

A notification in writing delivered in person to the individual or parties intended, or delivered at, or sent by certified or registered mail to, the last residential or business address of legal record.

Front 1658

Written Notice

Back 1658

A notification in writing delivered in person to the individual or parties intended, or delivered at, or sent by certified or registered mail to, the last residential or business address of legal record.
[1, 2009]

Front 1659

Wythe

Back 1659

Where referring to masonry chimneys, a course, a thickness, or a continuous vertical section of masonry separating flues in a chimney.

Front 1660

X-Ray Installations, Long-Time
Rating

Back 1660

A rating based on an operating interval of 5 minutes or longer.

Front 1661

X-Ray Installations, Mobile

Back 1661

X-ray equipment mounted on a permanent base with wheels, casters, or a combination of both to facilitate moving the equipment while completely assembled.

Front 1662

X-Ray Installations, Momentary Rating

Back 1662

A rating based on an operating interval that does not exceed
5 seconds.

Front 1663

X-Ray Installations, Portable

Back 1663

X-ray equipment designed to be hand carried.

Front 1664

X-Ray Installations, Transportable

Back 1664

X-ray equipment to be installed in a vehicle or that may be readily disassembled for transport in a vehicle.

Front 1665

Yard

Back 1665

An open, unoccupied space other than a court, unobstructed from the finished ground level to the sky on the lot on which a building is situated.

Front 1666

Yard Hydrant

Back 1666

A hydrant that is not designed to supply a fire department pumper.

Front 1667

Yard Storage

Back 1667

Storage of commodities in outdoor areas.

Front 1668

Yield Strength

Back 1668

The stress at which a material exhibits a specified permanent deformation or set.

Front 1669

Zero Governor

Back 1669

A regulating device that is normally adjusted to deliver gas at atmospheric pressure within its flow rating.

Front 1670

Zero Governor Regulator

Back 1670

A gas pressure regulator equipped with a counter spring beneath the valve that requires an external impulse signal such as top loading with pressure or generating vacuum in the downstream piping.

Front 1671

Zone 20 Hazardous
(Classified) Location

Back 1671

An area where combustible dust or ignitible fibers/flyings are present continuously or for long periods of time in quantities sufficient to be hazardous, as classified by 506.5(B)(1).

Front 1672

Zone 21 Hazardous
(Classified) Location

Back 1672

An area where combustible dust or ignitible fibers/flyings are likely to exist occasionally under normal operation in quantities sufficient to
be hazardous, as classified by 506.5(B)(2).

Front 1673

Zone 22 Hazardous
(Classified) Location

Back 1673

An area where combustible dust or ignitible fibers/flyings are not likely to occur under normal operation in quantities sufficient to be hazardous, as classified by 506.5(B)(3).

Front 1674

Zone

Back 1674

A defined area within a protected premises.

Front 1675

Zone

Back 1675

A defined area within the protected premises. A zone can define an area from which a signal can be received, an area to which a signal can be sent, or an area in which a form of control can be executed. [72, 2007]

Front 1676

Zone

Back 1676

A defined area within the protected premises. A zone can define an area from which a signal can be received, an area to which a signal can be sent, or an area in which a form of control can be executed. (SIG-FUN)

Front 1677

Zone

Back 1677

One of the sections of an area created for a particular purpose.

Front 1678

Zone Boundary

Back 1678

A structural component designed to contain flooding or fire to a specified space within a vessel.

Front 1679

Zoned Application System

Back 1679

A system designed to protect hazards in a predetermined portion of an enclosure.

Front 1680

Zoned Smoke-Control System

Back 1680

A smoke-control system that includes smoke exhaust for the smoke zone and pressurization for all contiguous smoke-control zones.

Front 1681

Zone of Protection

Back 1681

The space adjacent to a lightning protection system that is substantially immune to direct lightning flashes.