ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by SteveFehr. 07/23/17 09:46 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,280 Are you busy
174,739 Re: Forum
167,113 Need opinion
Who's Online Now
0 registered members (), 66 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#52448 - 05/26/05 09:01 AM #3's in 1"  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
I may be helping another EC install new panels in some condos. Need to run the feeders to each unit for a 100a panel. The runs will be 100-180'. No good strait shots and probibly a number of obstructions. We may need to install some pull boxes because of all the bends.

I would like to use 1 1/4 EMT with 3 #2 or #3's (depending on length) because it will be reasonable to pull by hand. The other EC is thinking 1" EMT with 3 #3's because it is quicker to bend and would save maybe $1500 in material.

The inspecter already said 3 #3's is fine in 1" and is not worried about VD because of little load in each unit.

I never tried to pull 3 #3 in a 1" very far by hand but I wounder if it is possable with out a tugger.

Tom


Work Gear for Electricians and the Trades

#52449 - 05/26/05 03:29 PM Re: #3's in 1"  
Celtic  Offline
Member
Joined: Feb 2005
Posts: 361
NJ
Code wise...3 #3 thhn's in a 1" EMT do fit, but just barely ~
1/2" = 1 #3
3/4" = 1 #3
1" = 3 #3
1 1/4" = 6 #3
...that 1/4" makes a HUGE difference!


I recall a job I did where 11 #10 XHHW conductors were pulled in a 3/4" RGC for stub-ups(code allows 11 @ 3/4")...the rope broke once, the guys were POed at me all day...and it took 4 guys just to pull ~ not including the guys at the feed end. After this fiasco(which took about a 1/2 day to go just over 100'), I had the crew start running "extra" 3/4" conduits overhead.
The amount of effort that was required to get the wires in was not worth it.


For you, a small tugger(gets attached to a RA drill or hole hawg) might be a viable alternative...pay for it once, use it over and over again.


~~ CELTIC ~~
...-= NJ =-...

#52450 - 05/26/05 06:17 PM Re: #3's in 1"  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I've been down that road exactly one time and I learned my lesson. You might try the 1" for some of the shorter runs, but I'd strongly advise going to the 1 1/4 " EMT for anything with more than two 90 degree bends. If you opt for the 1", let us know how it went.

Tom


Few things are harder to put up with than the annoyance of a good example.

#52451 - 05/26/05 08:32 PM Re: #3's in 1"  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
It's physically possible to pull four 3ga. wires in 1" IMC. With some lube you shouldn't have any problem. Additional pull points to keep it to two bends per pull will help. I recently PUSHED three 3 ga. in 1" IMC in short runs with one bend.

Dave


#52452 - 05/27/05 12:41 AM Re: #3's in 1"  
Celtic  Offline
Member
Joined: Feb 2005
Posts: 361
NJ
1" IMC is NOT the same as 1" EMT...1" IMC is allowed 4 #3's, 1" EMT is allowed 3 #3's.

Pushing 3 #3s in a 1" IMC is no special feat.


~~ CELTIC ~~
...-= NJ =-...

#52453 - 05/27/05 07:56 AM Re: #3's in 1"  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
Right Celtic, I missed that one.

Dave


#52454 - 05/27/05 08:26 AM Re: #3's in 1"  
rcksmith127  Offline
Member
Joined: Apr 2005
Posts: 33
Danvers, Ma, USA
I don't know what area you are in but I'll tell you in the NorthEast, more and more MC and believe it or not SER is being used in the residential hi-rises. (Condo's Apartments, Dormitories
Engineers, inspectors and even the contractors are pushing it.


#52455 - 06/02/05 08:35 PM Re: #3's in 1"  
William Runkle  Offline
Member
Joined: Feb 2003
Posts: 27
Dowagiac, Michigan U.S.A.
Have you thought of derating the neautral? Two number threes and a four or six.


William Runkle

#52456 - 06/02/05 11:48 PM Re: #3's in 1"  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
Thanks for the replys.

Local thing min size 3 #3 for 100a residential.

After a bit I think we would be better off doing a larger pipe with a few sets of feeders. I'm thinking about a 2" with 9 #2's until it gets near the unit.

Tom


#52457 - 06/03/05 04:15 AM Re: #3's in 1"  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Funny.... Local PoCo here requires 1 1/4 min. for resi. (2" U/G) And Rare to find #3 stocked anywhere, almost like it doesn't exist. #4 - #2!


Mark Heller
"Well - I oughta....." -Jackie Gleason

Page 1 of 2 1 2

Member Spotlight
waymag
waymag
dallas, texas, USA
Posts: 67
Joined: January 2002
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.8171 MB (Peak: 0.9924 MB) Zlib enabled. Server Time: 2017-07-24 14:42:00 UTC