Lightning protection

24"

Air terminals must be placed——— of the outside corner of edge of the object they are protecting

25'

Air terminals that extend 24" or more above the object or area to be protected will be permitted to be placed at intervals not exceeding

100 ft

All structures require at least two down conductors and at least one additional down conductor for every ______ of rood perimeter over 250 feet

18"

Aluminum down conductors must transition to copper at a minimum of _______ above where they can come into contact with the earth, using a listed bimetallic connector

potential

An electrical connection between an electrically conductive object and a component of a lightning protection system that is intended to reduce ______ differences created by lightning currents is an example of bonding.

75 feet tall

Class 1 materials may be combined with class II materials as long as they are installed on portions of the structure that are more than

3/16" thick

Electrically continuous structural steel may be used as a strike termination device or main lightning protection conductor if it is at least ______.

100 feet of roof perimeter over 250 feet

For lightning protection systems, all structures require at least two down conductors and at least one additional down conductor for every ______

yes

For lightning protection systems, is it acceptable to install down conductors in PVC.

Ground loop conductor

For structures exceeding 60 feet in height; the interconnection of the lightning protection system grounding electrodes and other grounded media must be in the form of a ____ ____ ____.

10'

Ground rods have a depth minimum of

Blockage

If conduit is required to run down conductors, it is recommended to confirm that it is being installed in the correct locations and that the openings are protected against foreign matter; this prevents ______ of conduits

Copper

Last longer than aluminum components on a lightning protection system

Buildings electrical ground

Lightning protection system grounds are to be tied to the

200'

Long vertical reinforcing steel members must have additional connections to lightning conductor at intervals not exceeding

High

Sandy or gravelly soil conditions are generally characterized by —————- soil resistivity therefore multiple grounding electrodes must be used to augment the lightning ground electrode systems

100 feet

Surge protective devices must be installed at all points where an electrical or electronic system conductor leaves a structure to supply another structure if the conductors or cable are run over _____.

3 feet

The maximum distance between supports for lightning protection cables is

3/8"

What is the minimum diameter of a class I copper lightning protection air terminal?

Authority Having Jurisdiction (AHJ)

When a product is labeled, it means that it has a symbol or identifying mark from an organization that is acceptable to the _____ _____ _____.

8 square inches

When bonding plate is used on a structural steel member it must have a minimum surface area of at least

5, 1/2"

When drilling and tapping into a steel column to install a lightning protection system, the air terminal must have at least ____, ____ inch threads fully engaged and secured with a jam nut.

24" 20'

When installing a lightning protection system, air terminals less than _____ inches tall must be placed on ridges of pitched roofs and around perimeter of flat or gently sloped roofs at intervals not exceeding ______ feet.

10" above the object or area it is to protect

When installing an air terminal the tip of the terminal must be at least

Metal bodies

When installing lightning protection systems, grounded and ungrounded _______ exceeding 60 feet in vertical length must be bonded to structural steel members as near as practical to their extremities unless inherently bonded through construction at these locations.

Bi-metallic type

When transitioning from aluminum to copper fittings must be of the

vertical

Long ______ reinforcing steel members must have additional connections to the lightning protection conductor at intervals not exceeding 200 feet.

Bare steel and free from contaminates

Prior to making exothermic connection to steel must be cleaned to

Electrically continuous

The structural steel framework of a structure can be utilized as a main lighting conductor

NFPA 780

The surge protection requirements outlined in ______ _______ include only permanently installed surge protective devices.

5 kV and a short circuit of 3 kA

The voltage Protection Rating (VPR) selected by the manufacturer is based on the measured limiting voltage determined when a surge protective device is subjected to a combination waveform with an open circuit voltage of

False

True or False A worker should install the air terminals and bases on the roof before laying out the conductor runs.

True

True or False Aluminum materials must not be attached to a surface coated with alkaline based paint or enbedded in concrete or masonry

True

True or False Down conductors run in or on reinforced concrete columns or on structural steel columns must be connected at both extremitys.

True

True or False Grounding electrodes for concealed systems follow the same rules as those for exposed systems.

True

True or False The bonding conductor requirements for Class I and Class II copper cables are the same.

True

True or False The use of the word "should" indicates a recommendation, suggestion, or something that is advised but not required to comply with the code or standard

False

True or False When used with lightning protection systems, a conductor that encircles and interconnect ground electrodes is called a equalizing conductor.

40 1/8

When installing lightning protection, roofs have a span of ______ feet or less and a pitch of ______ or greater are considered to be pitched.

Grounding electrodes

When structural steel is used as a lightning down conductor what must be connected near the base of the column

Square inches

When structural steel is utilized as the conductor and a lightning protection system, the bonding plate must have at least eight _____ _____ of bonding surface.

Copper to aluminum

When transitioning from ______ to ______ conductors in a lightning protection system, fittings must be of the bimetallic type.

20 feet

When using multiple ground rods, each 10 feet in length, in a lightning protection system, how many feet must the minimum spacing distance be between each rod?

8 10

Where ground rods are used for lightning protection grounding electrode they must be in contact with the earth for a minimum of _____ feet and extend to a depth of not less than ______ feet below finish grade, except as permitted for the requirements for shallow soil.