Mr. Awesome: Canadian Conduit Question

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Old 10-29-14, 05:38 PM
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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.
 
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Old 10-29-14, 06:12 PM
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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?
 
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Old 10-29-14, 06:53 PM
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One I remember in detail new install showing an expansion joint for buried conduit. I think the other was going into a panel.
 
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Old 10-29-14, 07:43 PM
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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.
 
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Old 10-29-14, 09:05 PM
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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.
 
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Old 10-29-14, 10:09 PM
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Thats old guy practice! My generation comments on how goofy that looks.
 
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Old 10-30-14, 06:30 AM
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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.
 
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Old 10-30-14, 11:32 AM
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One I remember in detail new install showing an expansion joint for buried conduit.
I just watched that episode over the weekend and cringed when I saw it. I think you're right about it being staged. It struck me as odd the height that he glued on the expansion joint, making it look like it wouldn't work on the pillar it was being installed.

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?
 
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Old 10-30-14, 03:55 PM
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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.
 
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Old 10-30-14, 04:01 PM
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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.
 
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Old 10-30-14, 04:21 PM
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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.
 
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Old 10-30-14, 04:28 PM
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Don't forget to use the cleaner as well. Hmmm does electrical PVC use cleaner? I think so, yes?
 
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Old 10-30-14, 04:42 PM
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No cleaner required when doing PVC electrical conduit.
 
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Old 10-30-14, 05:39 PM
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If you have a Netflix Subscription:Holmes Inspection
http://www.netflix.com/WiPlayer?movi...0-87d95961ef40
 

Last edited by ray2047; 10-30-14 at 08:06 PM.
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Old 10-30-14, 07:33 PM
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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
 
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Old 10-30-14, 09:48 PM
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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)
 
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Old 10-30-14, 10:16 PM
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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.
 
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