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NM Wire Designation Suitable For 220 V Residential Use ?

Discussion in 'Electrical Engineering' started by Robert11, Mar 29, 2005.

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  1. Robert11

    Robert11 Guest


    I understand that Copper No. 10 AWG is the correct wire size for a
    circuit in a residence with a 30 amp circuit breaker.

    If the wire used has the typical NM designation, is the insulation rated and
    suitable for
    220 V, as well as the conventional 110 V ?

  2. John Ray

    John Ray Guest

    As others have pointed out, NM is fine voltage wise, but depending on your
    application, its temperature rating may not be sufficient (ie. central heat)
    in which case SE would be a better choice.

  3. John Ray

    John Ray Guest

    True, but the question refered to using 10AWG NM in a 30A situation.
    Depending on what the actual usage is and, more specifically, what the
    ambient temp is, he might have to derate the NM. In a case like this he'd be
    better off with SE. In reality the NM would work fine, but for NEC
    compliance we need more specific information.

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