Grounding conductor size

[Ken Amelin]

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.

[Jim Port]

A #6 copper to a rod is all that is required even for a 2000 amp service.

[david shapiro]

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.