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Thread: Building One Line Diagram

  1. #1
    Join Date
    Dec 2007
    Location
    Mass north shore
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    Building One Line Diagram

    Hello,

    In commercial/industrial buildings, other than 490.48 substations, is a building power system one line diagram required by the NEC?

    Thx
    Mark

  2. #2
    Join Date
    Feb 2003
    Location
    New York, 40.7514,-73.9925
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    Required for what? For permit? That would be dependent on the AHJ.
    Ron

  3. #3
    Join Date
    Apr 2006
    Location
    Simi Valley, CA
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    8,195
    As a plan checker I will say yes, other wise how does the electrician know what to install?
    I can build anything you want if you draw a picture of it on the back of a big enough check.

    There's no substitute for hard work....but that doesn't mean I'm going to give up trying to find one.

    John Childress
    Electrical Inspector
    IAEI / CEI / C10
    Certified Electrical Inspector

  4. #4
    Join Date
    Dec 2010
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    1,325
    Quote Originally Posted by cowboyjwc View Post
    As a plan checker I will say yes, other wise how does the electrician know what to install?
    OP specifically asked about NEC.
    The more they overthink the plumbing, the easier it is to stop up the drain

  5. #5
    Join Date
    Dec 2007
    Location
    Mass north shore
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    I'm looking for an NEC requirement. I can find it anywhere as far as the NEC is concerned. I believe one is only required over 1000 volts.
    Mark

  6. #6
    Join Date
    Oct 2016
    Location
    Cleveland, Ohio
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    215.5...."If required by AHJ"
    Like cowboyjwc stated, if you have not designed out the job....all the things asked for in 215.5, what are you installing ?

  7. #7
    Join Date
    Apr 2006
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    Upstate S.C.
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    828
    As a design engineer, I would NEVER send out any drawing without a one line. Locally, you just don't/can't do that.

    RC
    It's my name going on that drawing, not yours. If what you want ain't right, it ain't going on the drawings!

  8. #8
    Join Date
    May 2003
    Location
    Leesburg, VA
    Posts
    7,059
    I can tell you this from tracing a fault or any troubleshooting of the power system it is invaluable. AND UP TO DATE IS EVEN BETTER
    Brian John
    Leesburg, VA

  9. #9
    Join Date
    Apr 2006
    Location
    Simi Valley, CA
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    8,195
    Quote Originally Posted by MyCleveland View Post
    215.5...."If required by AHJ"
    Like cowboyjwc stated, if you have not designed out the job....all the things asked for in 215.5, what are you installing ?
    There ya go.
    I can build anything you want if you draw a picture of it on the back of a big enough check.

    There's no substitute for hard work....but that doesn't mean I'm going to give up trying to find one.

    John Childress
    Electrical Inspector
    IAEI / CEI / C10
    Certified Electrical Inspector

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