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Thread: Multifamily residential service.

  1. #1
    Join Date
    Sep 2009
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    102

    Multifamily residential service.

    In 310.15b7 it states that you can use the 83% rule for sizing service conductors or feeder conductors that are feeding the entire load. Or for individual dwellings within a multifamily dwelling. I have a book that is showing a 6 unit multifamily. The calculated load come's out to 400 amps for the entire load for the building. The book is using the 83% rule to size the conductors to the service for the whole building. I do not believe that you can use that rule for sizing the service conductors for the entire load. What's your thought?

  2. #2
    Join Date
    Feb 2003
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    I don't think you can use 83% rule for the MAIN service conductors to a multi unit residential building.

    Individual services and feeders to each unit yes it is OK to use 83%.
    Edward
    The only thing I know, is the progressive discovery of my ignorance


  3. #3
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
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    32,344
    Quote Originally Posted by edward View Post
    I don't think you can use 83% rule for the MAIN service conductors to a multi unit residential building.

    Individual services and feeders to each unit yes it is OK to use 83%.
    I agree
    They say I shot a man named Gray and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



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