Sub panel ground wire size ?

Posted by Steve Barker on May 4, 2009, 6:52 pm

jamesgangnc@gmail.com wrote:

> On Apr 7, 7:32 am, jamesgan...@gmail.com wrote:

>> I'm going to put a subpanel in a garage. I'm going to run #4 copper
>> off a 70 amp breaker for the hots and neutral. It's about 70 feet and
>> #6 would probably do but I picked up a partial roll of #4 cheap. But
>> what I don't know is what the rules are for thegroundwiresize?

>
> I never found anyone with an answer for this. How do you figure out
> the ground wire size for a subpanel?

6ga is pretty much the standard for panel grounding up to 200a.

There's a reason that 6ga bare copper comes in a box of 25'.

s

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Sub panel ground wire size ? - Page 3