NEC practice exam questions with
complete solutions passed
Alternating-current systems from 50V to less than 1,000V that aren't required to
be grounded as per 250.20(B) must have _____.
the ground detection sensing equipment connected as close as practicable to
where the system receives its supply
ground detectors installed
250.21(B)(1) and (2)
An 800A fuse rated at 600V _____ on a 250V system.
can be used
240.61
An electrode encased by at least 2 in. of concrete, located horizontally near the
bottom or vertically and within that portion of a concrete foundation or footing
,that is in direct contact with the earth, shall be permitted as a grounding
electrode when it consists of _____.
at least 20 ft of bare copper conductor of 4 AWG or larger
at least 20 ft of ½ in. or larger steel reinforcing bars or rods
250.52(A)(3)
We have an expert-written solution to this problem!
An equipment bonding jumper can be installed on the outside of a raceway,
providing the length of the equipment bonding jumper is not more than _____
and the equipment bonding jumper is routed with the raceway.
72 in.
250.102(E)(2)
Armored cable shall not be installed _____.
where exposed to corrosive conditions
in damp or wet locations
, where subject to physical damage
320.12(1),(2), and (4)
At Type AC cable terminations, a(n) _____ shall be provided.
insulating bushing between the conductors and the cable armor
fitting (or box design) that protects the conductors from abrasion
320.40
Backfill used for underground wiring shall not _____.
damage the wiring method
prevent compaction of the fill
contribute to the corrosion of the raceway
300.5(F)
complete solutions passed
Alternating-current systems from 50V to less than 1,000V that aren't required to
be grounded as per 250.20(B) must have _____.
the ground detection sensing equipment connected as close as practicable to
where the system receives its supply
ground detectors installed
250.21(B)(1) and (2)
An 800A fuse rated at 600V _____ on a 250V system.
can be used
240.61
An electrode encased by at least 2 in. of concrete, located horizontally near the
bottom or vertically and within that portion of a concrete foundation or footing
,that is in direct contact with the earth, shall be permitted as a grounding
electrode when it consists of _____.
at least 20 ft of bare copper conductor of 4 AWG or larger
at least 20 ft of ½ in. or larger steel reinforcing bars or rods
250.52(A)(3)
We have an expert-written solution to this problem!
An equipment bonding jumper can be installed on the outside of a raceway,
providing the length of the equipment bonding jumper is not more than _____
and the equipment bonding jumper is routed with the raceway.
72 in.
250.102(E)(2)
Armored cable shall not be installed _____.
where exposed to corrosive conditions
in damp or wet locations
, where subject to physical damage
320.12(1),(2), and (4)
At Type AC cable terminations, a(n) _____ shall be provided.
insulating bushing between the conductors and the cable armor
fitting (or box design) that protects the conductors from abrasion
320.40
Backfill used for underground wiring shall not _____.
damage the wiring method
prevent compaction of the fill
contribute to the corrosion of the raceway
300.5(F)
