Sub panel ground rod

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Old 04-13-17, 02:50 PM
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Sub panel ground rod

I am getting ready to install a 100 amp sub panel in a detached garage about 100 feet from the house. I understand that I have to use a 1/0, 4 wire system, 2 hots, 1 neutral and 1 ground, and that I have to isolate the neutral bus bar from the sub panel enclosure (not hooking it with the ground). Were I remain confused is when it comes to the grounding rod requirements, or lack thereof. two questions: 1) do I need them at the garage? 2) are they installed in the conventional fashion, meaning a #6 bare ground wire from the ground bus to the 8' ground rods buried in the ground 6' apart? Even though I am not a licensed electrician, I like to do things the right way.

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Old 04-13-17, 02:53 PM
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Welcome to the forums! Your understanding is correct. It will depend on whether or not the concrete pour had a UFER buried in it as a plane ground. If it did, you may not have to bury but one grounding rod. If not, then two grounding rods, 6' apart and continuous #6 bare wire from panel through both rods using acorn nuts.
 
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