Marc,
If the service is on the house, and the garage is attached, then the
house ground rod will do. Just run the garage ground back to the house
main panel. Check with your local electrical inspector to see what size
wire is needed. Here in Austin, Texas we have to use a minimum of #4.
If your garage is a separate building the same ground wire is needed
between the main panel and the sub panel, but a ground rod is also
required at the garage.
Peace,
Pat
Marc wrote:
>I'm gathering materials to install a subpanel in my garage. Have 200 amp
>service, don't electric heat, or any really large loads. Nothing bigger
>than a electric clothes dryer or electric oven. Planning on 100 amp
>breaker in main panel, via 70 feet of 100 amp alum service entrance
>cable to a 100 amp main lug sub panel in the garage.
>
>Won't need too many circuits in garage, but need a 50 amp outlet for my
>MIG, some lighting, some outlets, a heater, and a large air compressor.
>Currently only have a single 30 amp circuit...
>
>Anyway, my question is about grounding - how do I need to ground the sub
>panel? Do I install a grounding rod for the sub panel, or run copper
>ground back to the main panel? possibly both?
>
>
>
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