Ground Rod


Old 10-11-13, 09:37 AM
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Ground Rod

So, i've completed an installation of a 100 amp subpanel in a detatached garage.. and i'm trying to sort out the ground rods... My question is how many do i need? I can not seem to locate the requirement for the number of rods in the 2011 NEC? 1 or 2? or the wire size...
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Old 10-11-13, 09:43 AM
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I'd just use one with #6 copper wire, I prefer bare 7 strand.
Old 10-15-13, 04:03 PM
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The number of ground rods needed is not specified in the code, only the requirement for a low-impedance path to ground. The means needed to meet that requirement is a local decision based on the conductivity of the soils in your area.

Ask your inspector.
Old 10-15-13, 05:57 PM
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Unless you can prove less than 25 ohms resistance on one rod you will need another one. If using a Ufer ground, you do not need any rods.

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