4-wire system

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I have a 4-wire system coming from the house to the garage. There is 2 black, one white , and one green. There is a panel in the garage with a three wire system, one black, one white, and one ground (12/2). How do I connect this up? I know normally the black goes to black, white on white, and ground to ground. I’ve tried that and get no power for the garage electricity. What do I do with the other hot black wire? Both black wires coming from the house wires are hot!

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mike 5 years 1 Answer 740 views 0

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    The best advice I can tell you is to watch my video on to install a subpanel. This should clear up everything.  subpanel

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