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Size of PVC for 6/3 NMWU #181604
10/18/08 10:50 PM
10/18/08 10:50 PM
M
mr_electrician  Offline OP
Member
Joined: Jun 2007
Posts: 106
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"


Never trust an electrician with no eyebrows!!
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Re: Size of PVC for 6/3 NMWU [Re: mr_electrician] #181608
10/19/08 08:49 PM
10/19/08 08:49 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
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.

Re: Size of PVC for 6/3 NMWU [Re: twh] #181609
10/19/08 08:56 PM
10/19/08 08:56 PM
M
mr_electrician  Offline OP
Member
Joined: Jun 2007
Posts: 106
London, Ontario
I am going to just pull in #6 T90 and transition to 6?3 NMD 90 inside the house. Easier by far!


Never trust an electrician with no eyebrows!!
Re: Size of PVC for 6/3 NMWU [Re: mr_electrician] #181611
10/19/08 10:15 PM
10/19/08 10:15 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
Regina, Sask.
Can you install T90 in an underground PVC run? We can't even install it outside in Saskatchewan.

Re: Size of PVC for 6/3 NMWU [Re: twh] #181613
10/20/08 07:20 AM
10/20/08 07:20 AM
M
mr_electrician  Offline OP
Member
Joined: Jun 2007
Posts: 106
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.


Never trust an electrician with no eyebrows!!
Re: Size of PVC for 6/3 NMWU [Re: mr_electrician] #181619
10/20/08 12:29 PM
10/20/08 12:29 PM
M
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
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.

Re: Size of PVC for 6/3 NMWU [Re: mikesh] #181670
10/22/08 05:32 PM
10/22/08 05:32 PM
R
RobbieD  Offline
Member
Joined: Feb 2003
Posts: 231
Canada
This page talks about the use of T-90.

Building Wire T-90

Re: Size of PVC for 6/3 NMWU [Re: RobbieD] #181675
10/22/08 09:01 PM
10/22/08 09:01 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
Regina, Sask.
We can't run T-90 outside because of its minimum temperature rating.

Re: Size of PVC for 6/3 NMWU [Re: twh] #181684
10/23/08 02:55 PM
10/23/08 02:55 PM
M
mr_electrician  Offline OP
Member
Joined: Jun 2007
Posts: 106
London, Ontario
Here in Ontario we are permitted to use T90 underground because it is dual rated. It is also rated TWN75.


Never trust an electrician with no eyebrows!!

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