Lightning Protection Lvl I Flashcards
Lesson 6: Bonding Requirements and Potential Equalization
Metal bodies, located outside or inside a structure, which contribute to lightning hazards because they are grounded or help in providing a path to ground for lightning currents, must be bonded to?.
Select one:
a. the electrical grid
b. the lightning protection system
c. the utility ground
d. none of the above
b. the lightning protection system
Bonding metallic bodies to the lightning protection system helps prevent dangerous arcs or “flashovers” from occurring in the event of a lightning strike.
Select one:
True
False
True
Which of the following factors help(s) determine the necessity of bonding a metal body to the lightning protection system?
Select one:
a. The influence of a non-grounded metal body, such as a metal window frame in a nonconductive medium, which is limited in its effectiveness as a short circuit conductor if a side flash occurs and which may not require bonding to the lightning protection system
b. The likelihood of a side flash between the lightning protection system and another grounded metal body
c. Both a. and b.
d. Neither a. nor b.
c. Both a. and b.
Bonding distance requirements are determined by an evaluation of which of the following?
Select one:
a. Flashover medium (air or solid materials) between the grounded metal bodies and the lightning down conductors
b. The distance between grounded metal bodies and the lightning down conductors
c. The number and location of lightning down conductors
d. All of the above
e. None of the above
D all
Metal bodies located in a steel-frame structure that are inherently bonded through construction do not require further bonding.
Select one:
True
False
True
?are used to interconnect lightning protection system down conductors, grounding electrodes, or other grounded media. These must not be smaller than the size required for the main lightning conductor.
Select one:
a. Bonding conductors
b. Ground conductors
c. Intermediate conductors
d. Loop conductors
d. Loop conductors
If a conductor is being used only for bonding and not as a main lightning conductor, it can be sized in accordance with bonding conductor requirements.
Select one:
True
False
True
Grounded and ungrounded metal bodies exceeding?in vertical length must be bonded to structural steel members as near as is practical to their extremities unless inherently bonded through construction at these locations.
Select one:
a. 30’
b. 40’
c. 50’
d. 60’
D. 60’
Given the formula and example shown, does the top of the pipe need to be bonded to the lightning protection system if it is bonded at ground level?


Select one:
a. Yes
b. No
Yes
Given the formula and example shown, if the pipe were nine feet away from the lightning protection system, would it need to be bonded at the top even though it is bonded at ground level?


Select one:
a. Yes
b. No
Yes
UL 96A does not give bonding distance calculation formulas; it simply states that all metal parts that are within six feet of a lightning protection system must be bonded to the system. It further states that metal parts that are further than six feet must be bonded if they are within six feet of a metal part that is already connected.
Select one:
True
False
True
All grounded media and buried metallic conductors that can assist in providing a path for lightning currents must be connected to the lightning protection system within?of the structure’s base.
Select one:
a. 6’
b. 9’
c. 12’
d. 15’
C. 12’
For structures exceeding?in height, the interconnection of the lightning protection system grounding electrodes and other grounded media must be in the form of a ground loop conductor.
Select one:
a. 60’
b. 75’
c. 100’
d. 120’
A 60’
For structures exceeding 60 feet in height, all grounded media in or on the structure must be interconnected within?of the main roof level.
Select one:
a. 3’
b. 6’
c. 9’
d. 12’
D 12’
Use the following statement to answer the question.
For structures exceeding 60 feet in height, all grounded media in or on the structure must be interconnected within?of the main roof level.
On a flat roof structure exceeding 60 feet in height, the interconnection is accomplished by bonding all grounded media to the roof lightning conductor.
True
