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    Isolated phase parallel runs.

    Utilizing 3 6" pvc conduits to a 3000A MDP. grouping parallel runs in an isolated phase per conduit manner. Planned on 9 800 CU runs using the 70 degree calc. Is it required to derate these conductors?

    #2
    Originally posted by Spencen9ne View Post
    Utilizing 3 6" pvc conduits to a 3000A MDP. grouping parallel runs in an isolated phase per conduit manner. Planned on 9 800 CU runs using the 70 degree calc. Is it required to derate these conductors?
    Yes it is. No neutral?
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

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      #3
      no neutral

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        #4
        Why do would you want to do this iso-phase? Also a 90° C conductor van use it's 90° C ampacity for the derating calculation.
        Rob

        Moderator

        All responses based on the 2014 NEC unless otherwise noted

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