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Thread: next higher size???

  1. #1
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    next higher size???

    Hi
    I am supplying a 120' away sub panel l thru a set of #6 thhn, cu in an apartment building.

    Question is,
    can use 70A ocpd for the feeder main ; according to next-larger size rule ?????

    Also,
    70A ocpd for the feeder main; What size copper wires can be used to feed that apartment sub panel. ???????

    Thank you

  2. #2
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    215.2 requires that your feeder conductor have the amapcity to supply the load so your #6 THHN would be good for a 65 amp loadassuming 75° terminations. If your load does not exceed 65 amps, you are good with a 70 amp overcurrent device.
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  3. #3
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    Quote Originally Posted by augie47 View Post
    215.2 requires that your feeder conductor have the amapcity to supply the load so your #6 THHN would be good for a 65 amp loadassuming 75° terminations. If your load does not exceed 65 amps, you are good with a 70 amp overcurrent device.
    I second that and add that if your feeder is NM cable - you are limited to 60C ampacity.
    I live for today, I'm just a day behind.

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