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  1. #1
    Sky Jones's Avatar
    Sky Jones Guest

    Default maximum nubmer of wires in a junction box

    Is there a recommend maximum number of wires in a junction box?
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  2. #2
    Join Date
    Mar 2007
    Location
    Orlando, FL
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    1,340

    Default Re: maximum nubmer of wires in a junction box

    Of course there is.

    Box fill is defined in the NEC and there are ways to figure the volume of a box to determine the maximum capacity of the devices installed inside the box.

    Plenty of charts and guides on the subject are available on line. You'll need to know the wire size, type of cable clamp, grounding conductor, device, etc.

    Dom.


  3. #3
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,899

    Default Re: maximum nubmer of wires in a junction box

    The chart is in Article 314 of the NEC.

    In the picture shown you have 7 12-2 cables for a total of 14 plus one ground. That box is overfilled by two conductors. An extension ring could be added to fix this.

    All answers based on unamended National Electrical codes.

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