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  1. #1
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    Mar 2008
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    Park City, Utah
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    Default Distribution Panels

    Can I chalk this up to the electrician having a bad day? Does anyone know what the requirements are regarding securing wires entering panels. Is it 12 inches?

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  2. #2
    Richard Moore's Avatar
    Richard Moore Guest

    Default Re: Distribution Panels

    Yep...NEC 334.30...within 12" of every cabinet, box, or fitting.


  3. #3
    Brandon Chew's Avatar
    Brandon Chew Guest

    Default Re: Distribution Panels

    They also cannot jam so many cables into one clamp unless the clamp is listed for it. I believe two NM cables is the limit. Could someone confim and provide a source on that for me? tx.


    Wahooo.... post #100 on the new board!

    Last edited by Brandon Chew; 03-18-2008 at 07:07 AM. Reason: post 100

  4. #4
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    Default Re: Distribution Panels

    Plus ...

    They are 'bundling or not maintaining spacing' for what looks like more than 24" for 'multi-conductor cables' too.

    Derating in now required.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
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    Mar 2008
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    Default Re: Distribution Panels

    There were a few other problems not visible in the photo. Wrote it up as further evaluation by electrician to correct multiple installation insufficiencies.


  6. #6
    Richard Abrams's Avatar
    Richard Abrams Guest

    Cool Re: Distribution Panels

    Watch Bundling of romex cables as anything over 4 wires would have to be derated. Especially if insulation material is installed in these cavitys.


  7. #7
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    Default Re: Distribution Panels

    Quote Originally Posted by Richard Abrams View Post
    Watch Bundling of romex cables as anything over 4 wires would have to be derated. Especially if insulation material is installed in these cavitys.
    If even two NM cables (any multi-wire cable for that matter) are bundled or spacing was not maintained, then derating takes affect.

    The code references "more than 3" but is also references "multi-conductor cables", because if you have 2 2-conductor cables (i.e., 2 multi-conductor cables), you have 4 conductors.

    Derating then becomes
    4-6 conductors - derate to 80%
    7-9 conductors - derate to 70%
    10-20 conductors - derate to 50%
    21-30 conductors - derate to 45%
    31-40 conductors - derate to 40%
    41+ conductors - derate to 35%

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    4,798

    Default Re: Distribution Panels

    Mathew,

    At the top of the second picture are those cables going up into the return air duct?

    The value of experience is not in seeing much, but in seeing wisely.

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