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?

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).

Quote:

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Originally Posted by hfcarson

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).

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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

8 are max fill, but more than 5 and you have to derate them

Just sayin'

Shunt...
More than 3 and you have to derate..

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...