ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
doc 3
Recent Posts
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
239,992 Are you busy
175,587 Re: Forum
167,836 Need opinion
Who's Online Now
0 registered members (), 60 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#170844 - 11/13/07 06:02 PM #12 THHN in 3/4" conduit.  
Trick440  Offline
Member
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
How are most guys doing this? What I'm hearing is only pull 3 #12 curcuits in 3/4" conduit. Is this what most guys are doing?

Please correct my math. If I pulled more, say 9 current carrying #12 conductors. Than it would be 2400w, derated to 1680w. So I could load the circuit up to 1680w.. (taking into consideration continuous loads)

I would like to know what most guys are doing. My background is residential, commercial is a different animal I'm still trying to grasp.

Thanks.


Shake n Bake

Work Gear for Electricians and the Trades

#170846 - 11/13/07 07:05 PM Re: #12 THHN in 3/4" conduit. [Re: Trick440]  
Trick440  Offline
Member
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
I did a search and figured it out.

9 current carrying conductors, neutrals count as current carrying.. Would keep #12 rated for 20amps. So 4 circuits in a 3/4"


Shake n Bake

#170850 - 11/13/07 09:02 PM Re: #12 THHN in 3/4" conduit. [Re: Trick440]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
You could put 4 multiwire single phase circuits in a conduit. That looks like 8 circuits at 120v.
310.15(B)(4)(a)
If you didn't have any harmonic loads it could be 3 3p wye multiwires for 9 120v circuits.


Greg Fretwell


Member Spotlight
akmaster
akmaster
alaska
Posts: 70
Joined: June 2012
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.012s Queries: 15 (0.003s) Memory: 0.7521 MB (Peak: 0.8777 MB) Zlib enabled. Server Time: 2017-08-20 17:35:26 UTC