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conduit fill #94144
07/07/05 11:24 PM
07/07/05 11:24 PM
M
MI Sparky  Offline OP
Member
Joined: Jul 2005
Posts: 14
Fenton, MI
since I dont have a code book handy, and I tried an online fill calculater...lets pose this question: 3 #6(Thhn/Thwn) and 1 #8 (thhn/thwn) in one conduit (NMRC) IE PVC, underground, unless I have missed something, using area per conductor, I should be able to use 3/4. I dont feel right using 3/4, I want to use 1"
Whats your thoughts?

This is for a hot tub rated at 50 amps, about a 150'-200' run


I thought that was off!!!!
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Re: conduit fill #94145
07/07/05 11:38 PM
07/07/05 11:38 PM
T
Tech-Home  Offline
Member
Joined: May 2005
Posts: 16
Burnsville, MN, USA
I use 1 inch regardless of what I can get by with. Easier pull, less strain on conductors.

Re: conduit fill #94146
07/08/05 03:38 PM
07/08/05 03:38 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,493
Michigan USA
MI sparky- since you gave me a left handed compliment I looked up the numbers for you:

Your total wire area in sq. inches is .1887 and the 40% fill limit would allow you to use ¾" Schedule 40 RNMC (.203) but not Schedule 80 (.164). As Tech Home said I'd probably run 1 inch because it's easier especially on that length of run. Wish you well in your career move.


George Little

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