Mr. Awesome: Canadian Conduit Question
#1
10-29-14, 04:38 PM
Mr. Awesome: Canadian Conduit Question
Been on a bit of a Mike Homes marathon and I have noticed that his electrician glues PVC conduit after he pulls the wires in. Is that a Canadian thing? South of the border we are taught not to do that because solvent cement may damage the insulation on the wires.
#2
10-29-14, 05:12 PM
Member
I have no idea why he did that, I've never seen it.
I've see guys pull wire before it is buried to reduce the risk of crushed pipe or concrete getting in and blocking a future pull, but never glue after wire is in.
Was this a new install or was he replacing something existing?
I've see guys pull wire before it is buried to reduce the risk of crushed pipe or concrete getting in and blocking a future pull, but never glue after wire is in.
Was this a new install or was he replacing something existing?
#4
10-29-14, 06:43 PM
Member
I have no clue ray. The only reason I could see a guy doing that is if he was replacing a broken section of a finished run.
#5
10-29-14, 08:05 PM
I suspect the show may be partly reenacted. Was just curious. You guys put the panels in sideways half the time so I was just wondering if it was more of the same Canadian weirdness.
#7
10-30-14, 05:30 AM
Group Moderator
I end up watching a Holmes show every week or so and I catch a few things - most recently them using mesh tape on a drywall job.
#8
10-30-14, 10:32 AM
One I remember in detail new install showing an expansion joint for buried conduit.
Now you have me wondering though... I know the jacket of NM-B and UF-B is PVC based, which would have issues with PVC cement. But the jacketing on THWN is some type of nylon I believe, which in theory shouldn't have any issue with PVC cement. Maybe?
#9
10-30-14, 02:55 PM
Join Date: Mar 2006
Location: Wet side of Washington state.
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I saw the results of someone doing an unscientific test of gluing PVC conduit after pulling the wires and the result showed no ill effect from doing so. Still, the NEC is adamant about NOT pulling conductors UNTIL the conduit system is complete. I would rather be in compliance with the NEC.
#10
10-30-14, 03:01 PM
Super Moderator
Sorry, OT, but where do you folks watch Holmes? Maybe I don't get enough channels. You can PM with answers, don't want to clutter the thread.
#11
10-30-14, 03:21 PM
Member
ray,
Holmes' guy was doing a no-no. Did some digging in my codebook...
12-936 (1) - Raceways shall be installed as a complete system before the conductors or cable are installed in them.
Although to be honest I technically break this rule all the time on service calls when we move or replace sections of pipe.
Next time I do some PVC work I'm going to bring a piece home with some scrap wire and dump glue on them to see what happens.
Holmes' guy was doing a no-no. Did some digging in my codebook...
12-936 (1) - Raceways shall be installed as a complete system before the conductors or cable are installed in them.
Although to be honest I technically break this rule all the time on service calls when we move or replace sections of pipe.
Next time I do some PVC work I'm going to bring a piece home with some scrap wire and dump glue on them to see what happens.
#12
10-30-14, 03:28 PM
Super Moderator
Don't forget to use the cleaner as well. Hmmm does electrical PVC use cleaner? I think so, yes?
#14
10-30-14, 04:39 PM
If you have a Netflix Subscription:Holmes Inspection
http://www.netflix.com/WiPlayer?movi...0-87d95961ef40
http://www.netflix.com/WiPlayer?movi...0-87d95961ef40
Last edited by ray2047; 10-30-14 at 07:06 PM.
#15
10-30-14, 06:33 PM
Member
Carlon has both a clear and purple primer, but I have never seen anyone use a primer/cleaner on PVC conduit. Primers are at the bottom of page 4 of this brochure.
http://www.carlonsales.com/Cement%20...alers_2F18.pdf
http://www.carlonsales.com/Cement%20...alers_2F18.pdf
#16
10-30-14, 08:48 PM
Super Moderator
I should have done a search...Carlon and several other sources say no primer needed. I was only basing it on the surface of the pipe and other in-person discussions.
(Note to self...do some research before making stupid statements)
(Note to self...do some research before making stupid statements)
#17
10-30-14, 09:16 PM
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
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Not a stupid statement and it won't hurt anything to use the primer. It just isn't necessary because you are not looking for a joint that is leak proof under pressure.
Historical note. When plastic pipe was first introduced they had no primer. The user was instructed to clean the end with some relatively fine sandpaper before applying the glue. I made up many, many joints in this manner and never had a leaker.
Historical note. When plastic pipe was first introduced they had no primer. The user was instructed to clean the end with some relatively fine sandpaper before applying the glue. I made up many, many joints in this manner and never had a leaker.
