The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Forum Software Upgrade coming soon...
by gfretwell
01/17/17 01:16 PM
Why cables look like they do
by Texas_Ranger
01/17/17 12:33 PM
Re: Fabricating Guards out of Lexan?
by ghost307
01/17/17 11:21 AM
Would ELV branch circuits be a good idea?
by ghost307
01/17/17 11:18 AM
100% breakers?
by Texas_Ranger
01/16/17 06:13 AM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
HotLine1 19
Webmaster 14
Trumpy 12
ghost307 12
gfretwell 10
Who's Online
2 registered (ghost307, gfretwell), 0 Guests and 78 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#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"
_________________________
Never trust an electrician with no eyebrows!!

Top
2017 / 2014 NEC & Related Books and Study Guides
#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: 899
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.

Top
#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!
_________________________
Never trust an electrician with no eyebrows!!

Top
#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: 899
Loc: Regina, Sask.
Can you install T90 in an underground PVC run? We can't even install it outside in Saskatchewan.

Top
#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.
_________________________
Never trust an electrician with no eyebrows!!

Top
#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.

Top
#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

Top
#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: 899
Loc: Regina, Sask.
We can't run T-90 outside because of its minimum temperature rating.

Top
#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.
_________________________
Never trust an electrician with no eyebrows!!

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals