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Thread: Sizing the OCPD

  1. #1
    Join Date
    Aug 2007

    Unhappy Sizing the OCPD

    I need to do a service drop (single phase - 3 wire type XHHW - copper)cable.

    Because of a daily summer time temp of 113 (F) I need to factor the correction 0.82 into the calculation.

    Based on the math I did, I would need a 1350 kcmil copper cable (300 Amps) to feed 246 amps after the correction. 300 X 0.82 = 246 amps. Question, do I have to use a 300 Amp breaker or a 250 Amp breaker?

    Thanks in advance
    Last edited by donf; 09-18-2009 at 01:00 PM. Reason: corrected spelling.

  2. #2
    Join Date
    Mar 2009

    Default Re: Sizing the OCPD

    250 would be fine. you have to do all the correction factors to protect the wire, not the breaker

  3. #3
    Join Date
    Feb 2009

    Default Re: Sizing the OCPD

    113 F Temp? I am just laughing. Where do you live? Hell?

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