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

    Jul 26, 2012, 06:18 PM
    Is # 4 awg thhn copper big enough for 100 amps
    Can I use # 4 awg thhn copper for 100 amps is it big enough ?
    Lectricman's Avatar
    Lectricman Posts: 2, Reputation: 1
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    #2

    Jul 26, 2012, 06:57 PM
    Use #2awg copper minimum at least in Canada, assume US to be same.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Jul 27, 2012, 02:35 AM
    #3 THHN copper is rated 100 amps, as per Table 310.16 of the 2008 edition National Electric Code for a feeder.

    If this feeder is the service entrance conductors for the service of a dwelling, you may use #4 copper.
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