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#181604 - 10/18/08 07:50 PM Size of PVC for 6/3 NMWU
mr_electrician Offline
Member

Registered: 06/22/07
Posts: 106
Loc: London, Ontario
Hi, how do you figure out what size PVC conduit to use if your pulling 6/3 NMWU into it for an outdoor hottub? My guess is to use 1"
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#181608 - 10/19/08 05:49 PM Re: Size of PVC for 6/3 NMWU [Re: mr_electrician]
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.
One inch is too small. It's a fight to get it into a short one inch sleeve. 1.25 inch is minimum but you need at least 1.5 inch if you have an LB.

I just pulled a run into 30 feet of 2 inch with 3 elbows and an LB. I did it alone, so it was probably oversized.

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#181609 - 10/19/08 05:56 PM Re: Size of PVC for 6/3 NMWU [Re: twh]
mr_electrician Offline
Member

Registered: 06/22/07
Posts: 106
Loc: London, Ontario
I am going to just pull in #6 T90 and transition to 6?3 NMD 90 inside the house. Easier by far!
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#181611 - 10/19/08 07:15 PM Re: Size of PVC for 6/3 NMWU [Re: mr_electrician]
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.
Can you install T90 in an underground PVC run? We can't even install it outside in Saskatchewan.

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#181613 - 10/20/08 04:20 AM Re: Size of PVC for 6/3 NMWU [Re: twh]
mr_electrician Offline
Member

Registered: 06/22/07
Posts: 106
Loc: London, Ontario
 Originally Posted By: twh
Can you install T90 in an underground PVC run? We can't even install it outside in Saskatchewan.


My pvc run will not be underground. Also if it was I am sure you can because it also has THWN classification. Please correct me if I am wrong on this one.
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#181619 - 10/20/08 09:29 AM Re: Size of PVC for 6/3 NMWU [Re: mr_electrician]
mikesh Offline
Member

Registered: 06/07/06
Posts: 614
Loc: Victoria, BC, Canada
The THWN is the saviour. but I think the Canadian designation is TWN75 as T90 is only ok for damp and dry locations. I presume the wire you have chosen is Dual rated? As for NMD in a raceway You are allowed %53 fill from table 8 for a single multi conductor cable Based on the measured area.

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#181670 - 10/22/08 02:32 PM Re: Size of PVC for 6/3 NMWU [Re: mikesh]
RobbieD Offline
Member

Registered: 02/23/03
Posts: 238
Loc: Canada
This page talks about the use of T-90.

Building Wire T-90

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#181675 - 10/22/08 06:01 PM Re: Size of PVC for 6/3 NMWU [Re: RobbieD]
twh Offline
Member

Registered: 03/11/04
Posts: 892
Loc: Regina, Sask.
We can't run T-90 outside because of its minimum temperature rating.

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#181684 - 10/23/08 11:55 AM Re: Size of PVC for 6/3 NMWU [Re: twh]
mr_electrician Offline
Member

Registered: 06/22/07
Posts: 106
Loc: London, Ontario
Here in Ontario we are permitted to use T90 underground because it is dual rated. It is also rated TWN75.
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