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Thread: New Service Panel Question

  1. #1
    Automotive Locksmith jparrie's Avatar
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    Default New Service Panel Question

    I'm installing a new 200A Service panel while remodeling. This unit has 42 slots, but there is no way that there are enough knockouts for even half that many cicuits. Does the NEC alow doubling or even tippling up on the nm romex through each knockout opening? Secure them all to framing within 8" of the service? Any derating required?

    TIA

  2. #2
    Licensed Electrical Contractor Speedy Petey's Avatar
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    Quote Originally Posted by jparrie View Post
    Does the NEC alow doubling or even tippling up on the nm romex through each knockout opening? Yes. It depends on the rating of the connector. Most allow at least two cables.

    Secure them all to framing within 8" of the service? 12" is code.


    Any derating required? No.
    This message was too short so I made this white.

  3. #3
    Automotive Locksmith jparrie's Avatar
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    Quote Originally Posted by Speedy Petey View Post
    Yes. It depends on the rating of the connector. Most allow at least two cables.
    Thanks! Can you point me to a source for this connector rating information?

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    Electrician Chris75's Avatar
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    This is for Arlington NM connectors only.


    http://www.aifittings.com/c_19.htm

  5. #5
    Licensed Electrical Contractor Speedy Petey's Avatar
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    Pretty much every NM connector that looks like that will accept at least two cables of varying sizes.

    You have to look at the label or instructions.

  6. #6
    DIY Junior Member Marv's Avatar
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    Two wires in every hole (12 & 14 gauge). In our county we can use the yellow or grey plastic fittings. Very easy to use.

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    Automotive Locksmith jparrie's Avatar
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    Quote Originally Posted by Marv View Post
    Two wires in every hole (12 & 14 gauge). In our county we can use the yellow or grey plastic fittings. Very easy to use.
    I'm not familar with those, who makes them?

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    DIY Junior Member Marv's Avatar
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    I'm not sure who makes them, just go to home depot and look for the plastic inserts by the metal connectors. They're fast and quick and hold the wire great.
    You get out of life what you put into it, minus taxes.

    Marv

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    Electrician Chris75's Avatar
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    Quote Originally Posted by Marv View Post
    I'm not sure who makes them, just go to home depot and look for the plastic inserts by the metal connectors. They're fast and quick and hold the wire great.
    Are you talking about these


    or these

  10. #10
    DIY Junior Member Marv's Avatar
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    I've used the second one. I've also used the yellow ones that are similar (and the yellow with double inputs).
    Last edited by Marv; 05-22-2008 at 05:20 AM.
    You get out of life what you put into it, minus taxes.

    Marv

  11. #11

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    If your inspector allows you to use grommets they must be stapled within 8 inches of the box. Some allow lots of cables going thru one big grommet. Others say one cable--one hole.

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    Electrician Chris75's Avatar
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    Quote Originally Posted by ked View Post
    If your inspector allows you to use grommets they must be stapled within 8 inches of the box. Some allow lots of cables going thru one big grommet. Others say one cable--one hole.

    Its a code violation to just use a grommet... even if you do staple within 8" of the box...

  13. #13
    Licensed Electrical Contractor Speedy Petey's Avatar
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    Quote Originally Posted by ked View Post
    Others say one cable--one hole.
    Also, "others" CANNOT simply say that. They must be able to back it up with a written code citation, which in this case they probably could not do.
    MOST NM connectors ARE rated for more than one cable.

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