NorthwestPV
Member
- Location
- Oregon, US
In Article 250.166(B), it says the grounding electrode conductor shall not be smaller than the largest conductor supplied by the system.
I have a project with a 400 Amp service. Its GEC consists of a #6 Cu ran to two ground rods. I have 2 DC sets of #4 running to a combiner box. It is my understanding that the DC GEC must equal the sum of the DC conductors which would be a 1/0 Cu GEC. The NEC only requires a #6 to the ground rods no matter how large the service is. Do I really need to run a 1/0 to the existing ground rods? My feeling is I should only have to run a #6. Am I wrong in my thinking?
I have a project with a 400 Amp service. Its GEC consists of a #6 Cu ran to two ground rods. I have 2 DC sets of #4 running to a combiner box. It is my understanding that the DC GEC must equal the sum of the DC conductors which would be a 1/0 Cu GEC. The NEC only requires a #6 to the ground rods no matter how large the service is. Do I really need to run a 1/0 to the existing ground rods? My feeling is I should only have to run a #6. Am I wrong in my thinking?