An industrial installation requires a grounding conductor for a 600V, 3-phase, 4-wire system. The maximum current is 500A. What is the minimum size of the grounding conductor required?
- A6AWG
- 8AWG
- C10AWG
- D12AWG
Exam tip
Always refer to NEC Article 250.122(B) for the minimum size of grounding conductors in 3-phase, 4-wire systems.
Why B is correct
According to 2026 NEC Article 250.122(B), the grounding conductor must be at least 8AWG for a 600V, 3-phase, 4-wire system with a maximum current of 500A. The other options are incorrect as they do not meet the requirements specified in the NEC.