ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
New fan motor for Panasonic
by HotLine1. 06/25/19 03:53 PM
Burning out of return(white) side of 120volt rec
by crselectric. 06/14/19 02:15 AM
Video door bell causing chime activation of coil
by JoeTestingEngr. 06/13/19 12:43 PM
Troubleshooting Voltage Drop Across Relay
by gfretwell. 06/09/19 11:49 AM
Apple Recalls Three-Prong Wall Plug Adapters
by Admin. 06/05/19 09:06 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 13 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
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!!!!
2017 / 2014 NEC & Related Books and Study Guides
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: 1,498
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

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sbi
sbi
indiana
Posts: 47
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
Admin 2
Khombo 2
Popular Topics(Views)
255,884 Are you busy
191,858 Re: Forum
181,623 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.9507 MB (Peak: 1.0762 MB) Zlib enabled. Server Time: 2019-06-26 22:13:54 UTC