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New construction. Got a 200 Amp panel - using copper conductors. The neutral and hot wires are 3/0 I believe. What size is the copper ground wire in the panel supposed to be?

Thanks.
 

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Master Electrician
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From the panel to the metallic water pipe entering the house and/or to the Ufer #4 copper or #2 Al. The NEC only requires #6 copper to the grounding rods however local codes may require #4.
 
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