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119 Cards in this Set

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Definition of: Approved
Acceptable to the authority having jurisdiction. (NFPA)
Definition of: Authority having jurisdiction (AHJ)
An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, and installation, or a procedure. (NFPA)
Definition of: Labeled
Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the AHJ... (NFPA)
Definition of: Listed
Equipment, materials, or services included in a list published by an organization that is acceptable to the AHJ... (NFPA)
Definition of: Standard
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... (NFPA)
Definition of: Bonding
An electrical connection between an electrically conductive object and a component of the lightning protection system that is intended to significantly reduce potential difference created by lightning currents. (NFPA)
Definition of: Chimney
A smoke or vent stack having a flue with a cross sectional area less than 500 sq in and a total height of 75 ft or less. (NFPA)
Definition of: Combination waveform generator
A surge generator with a 2-ohm internal impedance producing a 1.2/50 [mu]s open circuit voltage and an 8/20 short-circuit current wave-shape. (NFPA)
Definition of: Flame protection
Self-closing gauge hatches, vapor seals, pressure-vacuum breather valves, flame arresters, or other effective means to minimize the possibility of flame entering the vapor space of a tank. (NFPA)
Definition of: Flammable air-vapor mixtures
Flammable vapors mixed with air in proportions that will cause the mixture to burn rapidly when ignited. (NFPA)
Definition of: Flammable vapors
A concentration of constituents in air that exceeds 10% of its lower flammable limit (LFL). (NFPA)
Definition of: Flash Point
The minimum temperature at which a liquid or a solid emits vapor sufficient to form an ignitable mixture with the air near the surface of the liquid or the solid. (NFPA)
Definition of: Heavy-Duty Stack
A smoke or vent stack with a flue that has a cross-sectional area greater than 500 sq in and a height greater than 75 ft. (NFPA)
Definition of: Catenary lightning protection system
A Lightning Protection System consisting of one or more overhead ground wires. (NFPA)
Definition of: Class 1 Flammable Liquid
Any Liquid that has a closed-cup flash point below 37.8C (100F) and having a vapor pressure not exceeding 2068 mm Hg (40 psi) at 37.8C (100F). (NFPA)
Definition of: Combustible Liquid
Any liquid that has a closed-cup flash point at or above 37.8C (100F). (NFPA)
Definition of: Explosive Materials
Materials, including explosives (duh), blasting agents, and detonators, that are authorized for transportation by the Department of Transportation or the Department of Defense as explosive materials.
Definition of: Maximum Discharge Current (I max)
The maximum instantaneous value of the current through the SPD having an 8/20 waveshape (per mode of protection). (NFPA)
Definition of: Spark Gap
Any short air space between two conductors that are electriclly insulated from or remotely electrically connected to eachother. (NFPA)
Definition of: Striking Distance
The distance over which the final breakdown of the initial lightning stroke occurs. (NFPA)
Definition of: Suppressed voltage rating (SVR)
A specific measured limiting voltage rating assigned to a transient voltage surge suppressor (TVSS). (NFPA)
Surge arrestor VS. Surge protective device (SPD)
A Surge Arrestor limits surge voltage by discharging or bypassing surge current (repeatable), where a SPD will either limit or divert the current. (more general)
Definition of: Transient
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
Definition of: Transient Voltage Surge Suppressor (TVSS)
A surge protective device listed for connection on the load side of the main over-curent protection in circuits not exceeding 600 Volts RMS.
Is a 75 foot building class I or class II
Class I
Class 1 req- dia. of solid copper air terminal?
3/8"
Class 1 req- dia. of solid aluminum air terminal?
1/2"
Class 1 req- dia. & thickness of tubular copper air terminal?
5/8" dia & 0.033" thick
Class 1 req- dia. & thickness of tubular aluminum air terminal?
5/8" dia & 0.064" thick
Class 1 req- Minimum strand thickness for copper main conductor cable?
17 awg.
Class 1 req- Minimum strand thickness for aluminum main conductor cable?
14 awg.
Class 1 req- Min. strand size of copper secondary bonding cable.
17 awg.
Class 1 req- Min. strand size of aluminum secondary bonding cable .
14 awg.
Class II req- min dia. of solid copper air terminal
1/2"
Class II req- min dia. of solid aluminum air terminal
5/8"
Class II req- min size strand for copper main conductor
15 awg.
Class II req- min size strand for aluminum main conductor
13 awg.
Class II req- min strand size for secondary copper bonding wire/cable
17 awg
Class II req- min strand size for secondary aluminum bonding wire/cable
14 awg
What conductivity shall copper have when annealed?
95% conductivity
What shall copper chimney components be protected with?
A hot-dipped lead or tin coating.
How far above grade shall bimetallic splicers be installed?
At least 18".
What is the maximum wind resistance area for an ornament on an unbraced air terminal?
20 sq. in.
What is the maximum diameter of a ball ornament on an unbraced air terminal?
5"
The zone of protection may be found using a 1 to 2 sloped line on building of what heights?
25' or less
The zone of protection may be found using a 1 to 1 sloped line on buildings of what heights?
50' or less (and > 25')
Definition of: Pitched Roof
Span<=40' & a pitch>=1/8
Span>40' & a pitch>=1/4
At what height must the eaves on a pitched roof be at to require air terminals on the perimeter?
>50'
The perimeter of open areas in a roof shall NOT need additional protection under what conditions?
If the perimeter is greater than 300 ft, AND both rectangular dimensions exceeds 50'.
How far above grade shall an exposed down conductor be protected?
For at least 6'
If corrosive soil conditions are present, how far above grade must the down conductor (and ground) be protected?
For at least 3'
For long down conductors, how often must a conductor be connected to structural steel or rebar?
Every 200 ft or less.
What is the minimum outside diameter for masonry anchors?
1/4"
What is the pull test rating for cable fittings/
890N or 200lb
What is the minimum bonding area for primary bonding plates?
3 sq. in
What is the maximum conductor run length of a "dead-ended" air terminal on a main roof?
8'
What is the maximum conductor run length of a "dead-ended" air terminal on a non-main roof?
16'
What sized rod shall be used to support conductor runs through the air for more than 3'?
5/8" minimum
Welded grounding connections are required to have what bonding area?
At least 2 times the cross sectional area of the conductor.
Ground rod clamps shall make contact with the ground rod for what distance?
1-1/2"
What distance from the foundation shall ground rods be located?
2' minimum
In the event that bedrock lies near the surface, what distance & depth shall grounding cable be run in clay soil?
12' long x 2' deep
In the event that bedrock lies near the surface, what distance & depth shall grounding cable be run in sandy or gravelly soil?
24' long x 2' deep
In the event that bedrock lies less than 2 feet below the surface, what is the suggested grounding method? (per UL)
Grounding plates located at least 2 feet from the foundation with a surface area of 2 sq. ft.
In the event that Soil is less than 1' deep, what is the required grounding methods? (per UL)
The structure shall be encircled with a main sized ground loop. Ground plates are optional.
Definition of: Measured Limiting Voltage (MLV)
Maximum magnitude of voltage that is measured across the terminals of the surge protective device (SPD) during the application of impulses of specified wave shape & amplitude.
What is the minimum surface area of a ground plate?
2 sq. ft.
In a radial ground terminal system, what is the required length & depth of the ground radials?
12' long & 18" below grade minimum
Multiple radial terminals shall diverge at an angle not greater than what?
90 degrees
What sized tree trunk requires 2 separate down conductors?
3' dia. min.
What type of cable fastener is to be used on trees?
Drive type
What is the maximum distance between fasteners on trees?
3'-0" max. spacing
What are the 2 recommended grounding methods for trees? (conductors & terminals)
Grounding conductors shall be run out from the base of the tree in a shallow trench to beyond the drip-line of the tree. The ground terminals may either be radial, or terminate in ground plates.
What material is approved for use on trees?
Copper (and bronze)
A tree protection system should be connected to the building system if within what distance from the building?
25'
If multiple ground rods are used at one down location, what distance should separate the rods?
The sum of their 2 lengths
Where shall a concrete based electrode be located?
Near the bottom of a concrete foundation or footing that is in direct contact with the earth.
How much concrete shall a concrete based electrode be encased in?
2" minimum
What are the 2 terminal types that may make up a concrete based electrode?
Not less than 20' of main sized, bare copper conductor; or 20' of one or more steel reinforcing bars or rods not less than 1/2" in diameter that have been effectively bonded together by either welding or overlapping 20 diameters and wire-tying.
How deep must a ground ring electrode be?
18" minimum below grade
If a ground ring electrode is encased in concrete, how long must it be?
20' minimum
Shall a ground ring conductor be main sized, or secondary sized?
Main sized
What is the minimum thickness of a ground plate electrode?
0.032" minimum
How deep must a ground plate electrode be placed?
18" minimum below grade
How many threads shall be engaged in the structural steel by a threaded device connecting a bonding plate to the steel?
5 threads minimum
What kind of nut shall be used with a threaded device connecting a bonding plate to structural steel?
A jam nut
What is the minimum diameter of the threaded portion of a threaded device connecting a bonding plate to structural steel?
1/2" minimum
Where shall surge protective devices (SPD) be installed
At all points where an electrical or electronic system conductor leaves or enters a structure (unless the conductor supplies another structure and the conductors are run less than 100' or are buried or enclosed in grounded metal conduit or tubing)
What distance from the base of the structure shall all grounded material be connected to the L.P. system?
12' maximum
Ground loop conductors are required for buildings of what height?
60' and higher
How many ground terminals shall an electrically continuous metal mast or flagpole require?
1
A system for a heavy duty stack shall be which class? (I or II)
Class II
On a heavy duty stack, how far from the top shall the system be leaded?
25'
How thick, on a heavy duty stack, shall the lead covering be?
1/16" minimum
Name 4 materials that may be used for air terminals on a heavy duty stack.
Solid copper, Stainless steel, titanium, or Monel Metal
For heavy duty stacks, what is the maximum spacing for air terminals?
8'
What is the minimum height of air terminals on a heavy duty stack?
18" minimum
For top mounted air terminals on a heavy duty stack, what is the maximum height of the terminal?
18" max (& min)
What is the maximum height of air terminals on a heavy duty stack?
30" maximum
What diameter shall the air terminals be on a heavy duty stack?
5/8" dia. exclusive of corrosion protection
On a heavy duty stack, at how may locations must a side mounted air terminal be secured?
At least 2 locations
On a heavy duty stack, how thick must an electrically continuous steel hood covering be to be allowed to be used for the strike termination device?
3/16" min.
On a heavy duty stack with an 3/16" thick steel hood covering, what bonding area must the connections to the down conductors have?
8" sq.
On a heavy duty stack, what is the minimum size of any strand of cable?
15 AWG.
For a heavy duty stack, what is the minimum number of down conductors?
2 minimum
On a heavy duty stack, how close to the base must a loop conductor be installed?
Within 12', preferably below grade.
On a heavy duty stack, how far above grade shall conductors be protected from mechanical damage?
8' min
On a heavy duty stack, how often shall down conductors be connected with an intermediate loop conductor?
every 200' max.
Name 3 materials that are acceptable for use in fasteners on a heavy duty stack.
copper, bronze, or stainless steel.
On a heavy duty stack, how shall fasteners be anchored to the stack?
With masonry anchors, or lay-in attachments.
On a heavy duty stack, how often shall vertical conductors be fastened to the structure?
every 4' max.
On a heavy duty stack, how often shall horizontal conductors be fastened to the structure?
every 3' max.
Name 4 types of splicing methods that are approved on heavy duty stacks.
Bolting, brazing, welding, and high-compression connectors (must be listed for h.d. stacks)
On a heavy duty stack, what distance must splicers make contact with conductors?
1-1/2" minimum
On a heavy duty stack, how high must an exterior isolated metal body be, to be required to be bonded to the system?
150'
For a heavy duty stack, what is the minimum length of grounding rods?
10'
For a heavy duty stack, what is the minimum diameter of grounding rods?
5/8"
What is the striking distance that shall be used for structures containing flammable, or similarly dangerous materials?
100'
For catenary systems, what striking distance shall be used?
100'