ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Where is Everyone?
by Jim M - 06/23/21 10:04 PM
Happy Father's Day!
by Bill Addiss - 06/19/21 04:16 PM
A Risky Setup
by timmp - 06/18/21 08:08 PM
Conduit over Vinyl Siding
by Jim M - 06/16/21 08:30 PM
Updated Forum Software
by Admin - 06/15/21 10:23 AM
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 (), 10 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Sep 2003
Posts: 35
A
Member
To all who responded to the following post. I made a mistake. We are trying to pull 4 conductors of #4THHN/THWN in 1 inch PVC. Which is the maximum the code will allow.

All othere comments below still apply. I apologize for the incorrect post but it's been one of those days!!!!


Bob


=================================


Has anyone tried to install 4 conductors of # 6 THHN copper in 1 inch PVC. It's approximately a 70 ft run with 3 nineties and two offsets.

My customer had insisted on installing this portion to save money even though I told him to use 1 and 3/4 inch PVC.

I know the code allows up to 4 conductors in 1 inch PVC, and not more than 3 90's. However, I was forced to install two offsets due to knock outs not lining up.

I'm concerned I'll run into major problems when I pull this wire. I may even ask the customer to install 1.5 inch PVC to make it easier.

Any suggestions would be greatly appreciated.

Joined: Jan 2003
Posts: 4,391
I
Moderator
Bob, in that case I would say you got some issues.

The few times I have maxed out the wire fill in a raceway I have regretted it.

In my opinion this run needs 1.25" minimum.

If you are stuck with what you got the wires must be fed into the pipe perfectly, one wire crossing another and you will be all done.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: Sep 2003
Posts: 35
A
Member
Bob,

I agree. I think I'll go with 1-3/4 PVC. I could reduce the neutral conductor but I can't see where it would make it any easier.

I learned a valuable lesson today. Thanks again!!!

Joined: May 2002
Posts: 1,716
R
Member
Ace, what are the conductors feeding and what size overcurrent device are you proposing to use.

You will also have to count your EGC in this conduit fill which would bring a fifth conductor into the picture if we are talking a three phase four wire feeder.

Roger

Joined: May 2002
Posts: 1,716
R
Member
Ace, there is no such animal as 1-3/4" conduit.

Roger

Joined: Sep 2003
Posts: 35
A
Member
Roger,

We are feeding a 100 AMP subpanel Single Phase, with a 90 AMP overcurrent device in the main.

Joined: Sep 2003
Posts: 35
A
Member
Bob,

How come Roger beat you to the punch? In regards to 1-3/4 inch PVC.

I guess I would have found this out at the supply house. As you can see I'm not used to working with PVC.

Thanks again, Roger

Joined: Jan 2003
Posts: 4,391
I
Moderator
Quote
How come Roger beat you to the punch? In regards to 1-3/4 inch PVC.

I might be slipping or maybe I just figured that would be pointed out when you went to buy it. [Linked Image]

1/2", 3/4", 1", 1.25", 1.5", 2", 2.5", 3", 3.5", 4", 5" or 6"

Take your choice of the above. [Linked Image]



[This message has been edited by iwire (edited 10-25-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: May 2002
Posts: 1,716
R
Member
Ace,
Quote
We are feeding a 100 AMP subpanel Single Phase, with a 90 AMP overcurrent device in the main.
assuming 75 deg terminations you will only need three #4's (not knowing the neutral load) and a #8 cu EGC, 250.122.

Roger


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
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Top Posters(30 Days)
Admin 10
Popular Topics(Views)
280,478 Are you busy
213,565 Re: Forum
200,436 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5