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Thread: 4 Gang Boxes - Ontario

  1. #1
    Renovating Footman_75's Avatar
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    Default 4 Gang Boxes - Ontario

    Hi all,

    Question about wire/cap limits on a 4-Gang box in Ontario.

    Looking through my copy of the Electrical Code Simplified, can't seem to find any specs on 4-Gang boxes. Lots of info on wire / cap limits for up to 3-Gang though.

    Does this mean that 4-Gangs are not code anymore, or does it mean that there are no limits on wires & caps? Thoughts?

    Thanks for any input.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    It's not so much the # of gangs, but the cubic inches in the box. The number of cables and the size of the item to be mounted each has a value when added up, it can't be bigger than the volume of the box.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Electrical Contractor/Instructor jwelectric's Avatar
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    If it is a non-metallic box it will have the cubit inches stamped in the back of the box. Do the calculation of the conductors and devices going into the box to see if it is overfilled.
    See Table 310.16(B) and Section 310.16 for more information. If you don’t have access to a code book let me know and I will copy and paste them here.

  4. #4
    Renovating Footman_75's Avatar
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    Thanks. Going with 3-gang and then single box in other location. And, my simplified codebook has 3-gang in its table. Appreciate the help though.

  5. #5
    DIY Senior Member Homeownerinburb's Avatar
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    You would not have gone far wrong by multiplying the number you have for a similar 3 gang by 1.33.

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