philhanna@comcast.net
Member
According to NEC Table 250.122, I would use a 500kcmil equipment grounding conductor in the ground ring for a low voltage switchgear with a 4000A main breaker. I have seen designs that use a 4/0 with 4 ground rods for the ground ring when the main breaker is 4000A. Is there something in the code that allows a smaller quage (than 500kcmil) ground ring conductor when utilizing multiple ground rods.