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    boffer's Avatar
    boffer Posts: 3, Reputation: 1
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    #1

    Feb 1, 2010, 09:08 PM
    Wire size between 18KW generator and 200A auto transfer switch
    There is a 85 amp, 2 pole breaker at gen output that feeds the wire to the xfer switch.
    Is 1 gauge aluminum wire sufficient size for current conductors? 2 gauge for neutral and 3 gauge for ground? The NEC handbook has my head swimming.
    Thanks,
    Steve
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    Feb 1, 2010, 09:26 PM
    Yes, it is sufficient. If you already have the wire, use it.
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    #3

    Feb 1, 2010, 10:04 PM

    Thanks for the quick answer. Here's the back story.

    My neighbor hired an electrician to do the wiring. The guy showed up today with 4/0. On Thursday he plans on stuffing it, along with 4 control wires, into 1 1/2" conduit, which he put in today.

    I had convinced my neighbor I didn't know enough to do the install; now I have to convince him that I know enough to tell the electrician his wire is too big and his conduit is way too small!

    This better teach me not to be a nosy neighbor!

    Thanks again,
    Steve
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #4

    Feb 1, 2010, 10:13 PM
    Is this generator for a sub panel or to power the main panel?
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    #5

    Feb 1, 2010, 11:40 PM

    It's for the 200 amp main panel. The output of the xfer switch to the main will be 4/0. The major appliances are gas.
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