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Thread: Grounding conductor size
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11-21-2019, 06:49 AM #1
Grounding conductor size
This service has a solid copper wire for its grounding conductor that is attached to a rod in the adjacent concrete foundation wall. My question is in regards to its size. Is this adequate for this 200A service? Just to clarify, the braided #6 copper conductor that exits through the bottom of the panel is the metal pipe bonding cable. The house is on a well fed with plastic pipe and is not part of the grounding system.
Similar Threads:Last edited by Ken Amelin; 11-21-2019 at 06:54 AM.
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11-21-2019, 09:38 PM #2
Re: Grounding conductor size
A #6 copper to a rod is all that is required even for a 2000 amp service.
All answers based on unamended National Electrical codes.
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11-27-2019, 06:38 AM #3
Re: Grounding conductor size
I'm afraid the answer depends on whether the grounding electrode conductor falls under NEC Section 250.66(A) or (B). If there is a single grounding electrode, it shouldn't be just a single rod unless they verified <25 Ohm. With a rod, yep, 6 AWG. If it's a concrete-encased electrode and the rod is actually a rebar stub-up, then a single electrode will fly--but the GEC needs to be 4AWG.
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