Intermixing wire size

Discussion in 'Electrical Forum discussion & Blog' started by Mr_Magoo, Aug 12, 2008.

  1. Mr_Magoo

    Mr_Magoo New Member

    Messages:
    16
    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. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT
    Yes, you can use #12 with #14 as long as the breaker is 15amps, and nothing else needs to be done...
  3. Mr_Magoo

    Mr_Magoo New Member

    Messages:
    16
    Thanks for your help
  4. Chris75

    Chris75 Electrician

    Messages:
    608
    Location:
    Litchfield, CT
    No problem...
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