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#43918 - 10/25/04 02:38 PM Customer Installed PVC
acetoday Offline
Member

Registered: 09/18/03
Posts: 36
Loc: Manassas, Va
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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#43919 - 10/25/04 02:47 PM Re: Customer Installed PVC
velect Offline
Member

Registered: 05/01/04
Posts: 79
Loc: st joseph mi usa
I would never let a customer install any conduit, especially underground.

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#43920 - 10/25/04 02:50 PM Re: Customer Installed PVC
Roger Offline
Member

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

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#43921 - 10/25/04 02:51 PM Re: Customer Installed PVC
iwire Offline
Moderator

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

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#43922 - 10/25/04 02:52 PM Re: Customer Installed PVC
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Roger.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#43923 - 10/25/04 03:10 PM Re: Customer Installed PVC
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Bob, here we go again.

Roger

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#43924 - 10/25/04 03:20 PM Re: Customer Installed PVC
iwire Offline
Moderator

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

I consider myself in good company.

Bob
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#43925 - 10/25/04 03:22 PM Re: Customer Installed PVC
capt al Offline
Member

Registered: 06/20/04
Posts: 203
Loc: Norton, Ma USA
Is not most THHN also listed THWN and vice versa?

Al

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#43926 - 10/25/04 03:47 PM Re: Customer Installed PVC
Roger Offline
Member

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


It's almost erie at times.

Quote:
I consider myself in good company.
and let it be known this is mutual.

Roger

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#43927 - 10/25/04 04:37 PM Re: Customer Installed PVC
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
MOB oh I mean Capt Al.

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


I think you are correct.

The reason many of us point out the need for a "W" type insulation is only to show off. 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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