ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Anybody comment on materials pricing?
by gfretwell - 06/10/21 01:33 PM
2 pole GFI feeding 1 and 2 pole loads
by gfretwell - 06/04/21 02:27 AM
Lock-down Thread
by HotLine1 - 06/01/21 08:15 AM
Updated Forum Software
by Admin - 05/31/21 12:09 AM
Square D "All-In-One" Panelboard
by HotLine1 - 05/29/21 12:13 PM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 42 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#52448 05/26/05 09:01 AM
Joined: Feb 2003
Posts: 687
A
Member
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

#52449 05/26/05 03:29 PM
Joined: Feb 2005
Posts: 361
C
Member
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
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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
Joined: May 2005
Posts: 706
T
Member
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
Joined: Feb 2005
Posts: 361
C
Member
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
Joined: May 2005
Posts: 706
T
Member
Right Celtic, I missed that one.

Dave

#52454 05/27/05 08:26 AM
Joined: Apr 2005
Posts: 33
R
Member
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
Joined: Feb 2003
Posts: 27
W
Member
Have you thought of derating the neautral? Two number threes and a four or six.


William Runkle
#52456 06/02/05 11:48 PM
Joined: Feb 2003
Posts: 687
A
Member
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
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
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

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,156
Joined: May 2003
Top Posters(30 Days)
Admin 11
Trumpy 10
Popular Topics(Views)
280,296 Are you busy
213,389 Re: Forum
200,330 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5