A commercial building has a 480V, 3-phase, 4-wire service. The equipment grounding conductor is 6 AWG. What is the minimum size of the grounding electrode conductor required?
- A6 AWG
- 8 AWG
- C10 AWG
- D12 AWG
Exam tip
Always refer to the specific voltage and service type for the correct grounding conductor size.
Why B is correct
According to 250.66(A)(1), the grounding electrode conductor must be not less than 8 AWG for a 480V, 3-phase, 4-wire service.