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sub-panel grounding rod in same structure as service panel?

Posted by jeff_in_lalaland (My Page) on
Fri, May 21, 10 at 5:07

I've hired an electrician to replace a sub-panel in my attached garage. The sub-panel will be bonded via EMT to the service entrance, which is on the outside of the garage -- definitely the same structure. He claims I also have to drive a grounding rod for the sub-panel, and add a GEC from the sub-panel to a nearby water pipe. I don't want to because it costs more, looks ugly, and is likely to confuse future buyers. I can't see any reason for me to do this. Is this a new requirement in the most recent NEC? (I live in Los Angeles)


Follow-Up Postings:

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RE: sub-panel grounding rod in same structure as service panel?

He is 100% INCORRECT.
NO grounding electrode and NO water bond!

A 4-wire feeder is all that is required or wanted.
A 3-wire feeder in a complete metallic conduit system works as well, but the fittings must be made up tight and the bonding on both ends must be correct.


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RE: sub-panel grounding rod in same structure as service panel?

Thanks, Petey_racer


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RE: sub-panel grounding rod in same structure as service panel?

He is not even wrong.

If you DID add another grounding electrode it would need to be bonded to the existing grounding electrode.

This guy is a hack.

A sub-panel in the same structure (including an attached garage) needs a four wire feed.


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