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#43936 - 10/25/04 03:40 PM Customer Installed PVC *** CORRECTION***
acetoday Offline
Member

Registered: 09/18/03
Posts: 36
Loc: Manassas, Va
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.

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#43937 - 10/25/04 03:50 PM Re: Customer Installed PVC *** CORRECTION***
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
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

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#43938 - 10/25/04 03:54 PM Re: Customer Installed PVC *** CORRECTION***
acetoday Offline
Member

Registered: 09/18/03
Posts: 36
Loc: Manassas, Va
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!!!

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#43939 - 10/25/04 03:57 PM Re: Customer Installed PVC *** CORRECTION***
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
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

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#43940 - 10/25/04 04:00 PM Re: Customer Installed PVC *** CORRECTION***
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Ace, there is no such animal as 1-3/4" conduit.

Roger

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#43941 - 10/25/04 04:01 PM Re: Customer Installed PVC *** CORRECTION***
acetoday Offline
Member

Registered: 09/18/03
Posts: 36
Loc: Manassas, Va
Roger,

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

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#43942 - 10/25/04 04:06 PM Re: Customer Installed PVC *** CORRECTION***
acetoday Offline
Member

Registered: 09/18/03
Posts: 36
Loc: Manassas, Va
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

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#43943 - 10/25/04 04:20 PM Re: Customer Installed PVC *** CORRECTION***
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
 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.

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.



[This message has been edited by iwire (edited 10-25-2004).]
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#43944 - 10/25/04 04:30 PM Re: Customer Installed PVC *** CORRECTION***
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
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

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