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Thread: Intermixing wire size

  1. #1

    Default Intermixing wire size

    I am installing a generator transfer switch in the garage.

    My house is long and a main service panel feeds one half and a sub-panel feeds the other half. I want to put the master bedroom on the transfer switch. So, I will have to run it from the subpanel on the opposite side of the house.

    The master bedroom is wired with #14 with a 15 amp breaker. I was thinking of doing the long run (about 80') from the sub-panel with #12 to minimize voltage drop. I would keep the existing #14 in the bedroom with only the #12 providing the feed. It would still have a 15amp breaker. Is intermixing wire size legal? I can put a label in the subpanel on the #12 that says "15amp only/#14 wire in circuit" to avoid confusion in the future.

  2. #2
    Electrician Chris75's Avatar
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    Default

    Quote Originally Posted by Mr_Magoo View Post
    I am installing a generator transfer switch in the garage.

    My house is long and a main service panel feeds one half and a sub-panel feeds the other half. I want to put the master bedroom on the transfer switch. So, I will have to run it from the subpanel on the opposite side of the house.

    The master bedroom is wired with #14 with a 15 amp breaker. I was thinking of doing the long run (about 80') from the sub-panel with #12 to minimize voltage drop. I would keep the existing #14 in the bedroom with only the #12 providing the feed. It would still have a 15amp breaker. Is intermixing wire size legal? I can put a label in the subpanel on the #12 that says "15amp only/#14 wire in circuit" to avoid confusion in the future.
    Yes, you can use #12 with #14 as long as the breaker is 15amps, and nothing else needs to be done...

  3. #3

    Default

    Thanks for your help

  4. #4
    Electrician Chris75's Avatar
    Join Date
    Aug 2007
    Location
    Litchfield, CT
    Posts
    608

    Default

    No problem...

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