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

    Mar 24, 2011, 05:08 PM
    What gauge wire do you use for a 20 amp breaker
    What gauge wire do I use for a 20 amp breaker
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    Mar 24, 2011, 08:05 PM
    A 20 amp breaker is generally used with 12ga wire. You may use this breaker for a larger wire, 10, for example. The purpose of a breaker or fuse is to protect the wiring.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #3

    Mar 25, 2011, 07:34 AM

    Are you using copper or aluminum wire?

    240.4(D)(3) sets the amperage on a 12AWG on AL. wire to 15 amps.

    240.4(D)(4) on copper wire to 20 amps.
    Kyle_in_rure's Avatar
    Kyle_in_rure Posts: 341, Reputation: 10
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    #4

    Apr 17, 2011, 01:36 PM
    If you are using copper wire it would be 12 AWG, however if you are going a longer distance you may want to use 10 AWG. If you are using aluminum, that is a different story, so double check.
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