I have a Chicago Electrical Code grounding issue.
If a building contains multiple services due to size of building, say (2)@3,000A and (2)@400A, what size would the grounding electrode conductor be from the main building ground bus to the waterpipe? Would this conductor be sized based on the largest service(1@3,000A), or would it be sized based on combining the sum of the areas of ALL of the service conductor sets?
(NEC is simpler because the largest grounding electrode required is #3/0 per table)
Any input would be greatly appreciated!!
If a building contains multiple services due to size of building, say (2)@3,000A and (2)@400A, what size would the grounding electrode conductor be from the main building ground bus to the waterpipe? Would this conductor be sized based on the largest service(1@3,000A), or would it be sized based on combining the sum of the areas of ALL of the service conductor sets?
(NEC is simpler because the largest grounding electrode required is #3/0 per table)
Any input would be greatly appreciated!!