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Thread: conduit body fill

  1. #1
    Join Date
    Mar 2004
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    1

    conduit body fill

    I have a project that I have to splice 3 hot, 2 neutral and 1 ground #10 wire in 3/4 T conduit body. It has 7.1 cu in. marking. How many wires can I splice in 3/4 conduit body?

  2. #2
    Join Date
    Feb 2003
    Location
    Illinois
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    19,005
    Quote Originally Posted by alworld View Post
    I have a project that I have to splice 3 hot, 2 neutral and 1 ground #10 wire in 3/4 T conduit body. It has 7.1 cu in. marking. How many wires can I splice in 3/4 conduit body?
    You do the calculations just like box fill calculations using Table 314.16(B) for the volume of the conductors. A device with a volume of 7.1 would be way too small for that application.
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

  3. #3
    Join Date
    Nov 2007
    Location
    Columbus, Ohio
    Posts
    2,234
    I'd guess you would need a 1-1/4" TEE for those splices.
    With great power comes great resistance - times current squared, of course.

  4. #4
    Join Date
    Aug 2011
    Location
    California
    Posts
    19
    Like V said the t condulet is too small #10 count as 3.00 cu inches. If I am not mistaken and you have more than four current carrying conducters. Use a larger T condulet and some reducing bushings. And of course you can only splice if the LL or T is marked per code.
    Last edited by ACE1970; 09-19-11 at 06:37 PM.

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