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Thread: NEC 220.61

  1. #1
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    NEC 220.61

    What is this section for? How does it interface with the neutral being a current carrying conductor when more than 3 are in a raceway. adjustment factors apply?

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    As a past Chair for CMP 16 (yes I know it was not over article 220) you should have a pretty good idea of what your compadres in CMP 2 had in mind.

    Roger
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    I gather that you and Roger are acquainted.

    My answer: first you calculate the load, then you pick a conductor that has sufficient ampacity for that load. Third (not related to your question) you pick an OCPD that will protect that conductor. In your case, you use 220.61 to calculate the load that the neutral wire will see. Then you use the ampacity rules in 310.15(B)(16) to figure out what size wire to use. That step is where you deal with more than 3 CCCs in a conduit, or with higher than 30C ambient temperatures.
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

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