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  1. #1
    mathew stouffer's Avatar
    mathew stouffer Guest

    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
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    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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    26,186

    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
    mathew stouffer's Avatar
    mathew stouffer Guest

    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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    5,005

    Default Re: Distribution Panels

    Mathew,

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


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