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Thread: Existing Subpanel Wire Size & New Subpanel

  1. #11
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    breakers manufactured these days are Cu-Al rated. any good anti-oxidant used with aluminum will work. 6/3 with ground copper romex will work with a 65 amp breaker, 6/3 aluminum will work with a 50 amp breaker.

  2. #12
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    Ground Wire Size

    One more quick question, did I hear that my ground wire must be the same size because this is for a subpanel? Or can I use a 6/3 Romex with a smaller bare ground wire (8 or 10) for the 50A subpanel?

    Thanks again,
    Joe

  3. #13
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    6/3 romex has a reduced size earth ground. It attaches to an auxillary ground bar that you buy for the panel. The neutral is full sized and connects to the neutral bus with no bonding screw.

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