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    marcolimon's Avatar
    marcolimon Posts: 1, Reputation: 1
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    #1

    Jan 2, 2008, 11:26 PM
    Breaker wiring
    What kind of wire do I need for a 250 amp breaker?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jan 3, 2008, 03:33 AM
    Generally, either #250 MCM copper with THHN/THWN insulation, or 300 MCM aluminum with XHHW insulation.

    Any great length, high ambient temperature, or more than 4 current carrying conductors would require larger wire.
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