primer

[amptech]

I was taught that plumbing PVC had a clear coat varnish on the outside that needed to be removed/disolved by the primer to allow the cement to work properly. PVC conduit has no such coating.

 

[celtic]

Does electrical PVC have any real taper to it? How about plumbing PVC?

What happens when plumbing PVC is cut - where is the taper?

You could chamfer the edges, but is that a "taper"?

 

[mdshunk]

What happens when plumbing PVC is cut - where is the taper?

You could chamfer the edges, but is that a "taper"?

Plumbing fittings have tapered sockets. Electrical fittings have primarily straight sockets. You can observe this when you glue plumbing together, if you don't hold it, the pipe will often push right out of the fitting socket an inch or two. With electrical fittings, very little or not at all, depending on the brand.

 

[RayS]

I say the only time you need to use primer is when you need it to hold...
I like to use it, and try not to get any running into the pipe- a quick wipe around the male end, then in the bell after that has dried the dauber out a little. Never had a problem with it getting on the wires.

 

[Dave58er]

I saw it spec'd on a prison job once.

The only time I do it otherwise is when I'm working with those guys that pull the conduit through the ground for light poles and such. I also have to use a heavier glue then I get from most electrical supply house's.

 

[Paul B]

There was a thread concerniing this a year or so ago I think. I was blasted for mentioning that I used primer on a job where the pvc was submerged. If I remember correctly someone said the pipe will fail. I have been able to pull apart pvc conduit joints or should I say wiggle apart just using Carlon without primer not that I use it. But I have glued primed plumbing parts that will break long before you could ever get them apart.

 

[Shockedby277v]

Did you use it on electrical PVC though??

 

[iwire]

Due to condensation. Do you think it would help keeping the actual water in the ground out though??

Maybe.

My experience is if it is a raceway and it is in the ground it will have at least some spots filled with water and many times it is literally full of water.

Probably why type 'W' conductors are required.

 

[barbeer]

I believe that you may use primer if you like pretty colors, but for electrical PVC conduit it is not required due to the moisture resistance of our conductors. I do however believe that primer is required for all plumbing connections, both DWV and potable to actually help bond the plastics. You would not want "outside" interference in your glass of water if you know what I mean! Different types of PVC need different glues i.e. cpvc gets yellow glue and the fire riser (orange) gets red I believe. The high alcohol content in primer causes quick evaporation so no ill effect would be had on contents of said piping. The color of primer is for inspection purposes only or for forgetful people

 

[JohnE]

I've posted before, that I almost always use primer. I don't remember getting blasted for saying it, but I might not have posted it in the same thread. I realize that using just the cement should be fine, but in a trench, things are not always perfect and pretty. I like the assurance that things should be fine when we come back after backfilling to pull.

 

[barbeer]

Pride in one's work is a dying trait- unfortunately I see evidence of this more and more. In trenches, especially for long pulls, I believe that rigid 90's are the only way to go

 

[don_resqcapt19]

In trenches, especially for long pulls, I believe that rigid 90's are the only way to go.

They are, but if they are not covered by at least 18" of earth or 2" of concrete you will have to find a way to provide a bonding connection to the metallic 90. 250.86 Exception #3.
Don

 

[barbeer]

Thats the first time I have seen that one! Our book is too big

 

[DGrant041]

Happy New Year!

This tread stuck out to me for a couple reasons. In maintenance I have seen a few pipes full of water to the junct. box. It's been my experience that poor fittings have caused this, not condensation. But over in Missouri, the utility guys said they put drain holes in both the 90's. Appearently they've seen countless service pipes full of water all the way to the Distr. Box.

Now is this their way of dealing with the open fittings that are typical in their line of work or is it really condensation?

What do you see?

 

[bcollins]

I have experienced first hand, that the acetone does in fact break down the insulation on the wires. Some one else did the run, and after an undetermined amount of time I was the lucky one that had to pull and run new.