Backup Generator


Old 03-13-06, 11:51 AM
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Join Date: Mar 2006
Location: suburb of Milwaukee
Posts: 4
Backup Generator

I have a situation where there is a backup generator at the house that covers the house. There is a barn about 300 feet from the house that has a seperate service entrance but comes from the same power company transformer as the house. I ran a line from the generator panel to the barn to provide one outlet during a power failure. I want to put a GFCI on it. I don't know if it should be grounded to the barn service or kept isolated and the ground brought back to the house or not have any ground connection with the house.
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Old 03-13-06, 12:02 PM
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Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,337
Your power company's rules probably prohibit any electrical connection between the two structures.

That aside, the ground for this circuit should connect in the same panel that the neutral and hot do which would be the generator panel. I'm not entirely certain here, but think this circuit should have no interconnection with the barn's grounding system. Someone with more experience with multi-service installations will know better than I.

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