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    Michael K404's Avatar
    Michael K404 Posts: 2, Reputation: 1
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    #1

    Aug 3, 2012, 07:21 AM
    PVC Conduit Body
    Within a 1/2 in PVC conduit body there is 4 cu in of space. When applying the wire volume rules to conductors entering this body it seems that this size body is not very useful. For example, if I were to use #12 wire (volume = 2.25) I would only be allowed to have 1 conductor entering the body, because it's only 4 cu in.

    Have I gone wrong in this calculation?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #2

    Aug 3, 2012, 09:49 AM
    Mike,
    If you are not splicing in the conduit body then the maximum number of conductors is maximum number permitted by table 1 or chapter 9 for the conduit or tubing to which it is attached...
    If you are splicing then use 314.16(C)(2).
    Michael K404's Avatar
    Michael K404 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Aug 4, 2012, 07:29 AM
    Quote Originally Posted by hfcarson View Post
    Mike,
    If you are not splicing in the conduit body then the maximum number of conductors is maximum number permitted by table 1 or chapter 9 for the conduit or tubing to which it is attached...
    If you are splicing then use 314.16(C)(2).
    I will not be splicing. Thank you very much. That makes sense. It's just the answer I wanted to hear.

    I'll be using #12 THHN in 1/2" sch 40 PVC and it looks like 8 conductors are permitted. More than I want.

    I'm grateful that you're here for us.
    Michael
    shuntripper's Avatar
    shuntripper Posts: 180, Reputation: 8
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    #4

    Aug 4, 2012, 08:10 AM
    8 are max fill, but more than 5 and you have to derate them

    Just sayin'
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #5

    Aug 4, 2012, 08:17 AM
    Shunt...
    More than 3 and you have to derate..
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #6

    Aug 4, 2012, 08:25 AM
    More specifically... more than 3 "current carrying conductors"...

    In this case with #12 AWG THHN 90C copper, (most likely),
    Eight #12 derate to 70% which would be 21 amps... 12 AWG is required
    To be protected by a 20 ampere overcurrent so here the derating is somewhat
    Of non-issue...
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