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#43918 10/25/04 05:38 PM
Joined: Sep 2003
Posts: 35
A
Member
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.

#43919 10/25/04 05:47 PM
Joined: May 2004
Posts: 81
V
Member
I would never let a customer install any conduit, especially underground.

#43920 10/25/04 05:50 PM
Joined: May 2002
Posts: 1,716
R
Member
Ace, this shouldn't be a difficult pull.

6 number 6 THHN conductors are allowed in 1" PVC, and the 2 offsets shouldn't exceed 360 deg when added to the 270 deg of the 3 90's

Roger

#43921 10/25/04 05:51 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
OK

First I would mention that if this run goes underground you need THWN.

Moving on, five or six - 6 AWG THHNs are allowed in 1" PVC. It depends if you are using schedule 80 (five wires) or schedule 40 (six wires)

The NEC allows 360 degrees of bend between pull points, three 90s and two offsets should be fine unless you made you offsets sharp.

I do not see a problem with this pull, although I would definitely use wire pulling lube, you can get small containers of it at any decent supply house. I like Dyna blue pulling lube it cleans up easy.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#43922 10/25/04 05:52 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
Roger. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#43923 10/25/04 06:10 PM
Joined: May 2002
Posts: 1,716
R
Member
Bob, here we go again. [Linked Image]

Roger

#43924 10/25/04 06:20 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
The inside joke here is that Roger and I have a strange habit of answering the same posts at close to the same moment with very similar answers.

This has happened many times here and elsewhere. [Linked Image]

I consider myself in good company. [Linked Image]

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#43925 10/25/04 06:22 PM
Joined: Jun 2004
Posts: 206
C
Member
Is not most THHN also listed THWN and vice versa?

Al

#43926 10/25/04 06:47 PM
Joined: May 2002
Posts: 1,716
R
Member
Bob,
Quote
The inside joke here is that Roger and I have a strange habit of answering the same posts at close to the same moment with very similar answers.

This has happened many times here and elsewhere. [Linked Image]

It's almost erie at times. [Linked Image]

Quote
I consider myself in good company. [Linked Image]
and let it be known this is mutual. [Linked Image]

Roger

#43927 10/25/04 07:37 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
MOB oh I mean Capt Al. [Linked Image]

Quote
Is not most THHN also listed THWN and vice versa?

I think you are correct. [Linked Image]

The reason many of us point out the need for a "W" type insulation is only to show off. [Linked Image] Well that and make everyone aware of 300.5(D)(5)

Quote
300.5(D)(5) Listing. Cables and insulated conductors installed in enclosures or raceways in underground installations shall be listed for use in wet locations.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
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