When a ground ring is used as a grounding electrode, it must be at least a 2 AWG copper conductor at least __________ feet long.
A) 15
B) 20
C) 30
D) 50

Question

Quizplus · Accepted Answer

According to NEC Article 250.52(A)(3), a ground ring must be a minimum of 2 AWG copper and must encircle the building or structure being grounded. The length of the ground ring must be at least 20 feet.

When a Ground Ring Is Used as a Grounding Electrode