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    Goonies4Life's Avatar
    Goonies4Life Posts: 1, Reputation: 1
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    #1

    Apr 8, 2015, 07:36 AM
    Heavier to light wire
    I'm hooking lights in my shed and I want to know if I can go from a 10-3 wire down to a 12-2 wire. Is this allowed or will it cause problems?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #2

    Apr 8, 2015, 08:48 AM
    The size of the cable usually indicates the size of the overcurrent protection or circuit breaker. #10 awg cable is typically protected by a 30 ampere circuit breaker. Connecting #12 awg cable to a 30 ampere circuit would be a code violation as #12 should be protected by no more than a 20 ampere circuit breaker.
    If you change the circuit breaker to a 20 ampere, then you can use the #12 awg...
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