Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Primer

  1. #1
    Join Date
    Mar 2008
    Location
    Michigan. It's a beautiful penninsula, I've looked around.
    Posts
    5,952

    Primer

    Some inspectors require primer to be used on PVC. I know an EC that has carried around a can of clear primer for years and never used it. When the inspector asks why there is no visible primer on his pipe runs, the EC says it's because it's clear and shows him the can.

    I have toyed with PVC for years and I really do think that the primer makes for a better connection, but do we really need the glue (cement) to do anything more than keep the pipe from falling apart? It's not our job to make the pipe waterproof.

    I think that, although much stronger, purple primer looks like crap on a pipe run. I know how to do it so the primer is barely visible, but most electricians slap it on like BBQ sauce on a side of roasting venison.

    Do we really need to use primer?

    I think it's overkill for our application, but I still use it.

    Do you inspector types gig people for not using primer? What code requires it?
    Cheers and Stay Safe,

    Marky the Sparky

  2. #2
    Join Date
    Feb 2003
    Location
    Ohio
    Posts
    989
    I have never used primer and have never been required to. Further, I have also never witnessed a run of underground PVC that was ever dry either (and I'm not sure primer would cause it to be dry).

    Pete
    Experience is something thats gained shortly after you really needed it.

  3. #3
    Join Date
    Jun 2005
    Location
    North Logan, Utah
    Posts
    7,950
    Electrical PVC does not require the use of primer.

    Chris

  4. #4
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    19,477
    Quote Originally Posted by raider1 View Post
    Electrical PVC does not require the use of primer.

    Chris
    I want to agree with Chris but wonder if he has a resource that says it's not required? Maybe something from Carlon?
    Rob

    Chief Moderator

    All responses based on the 2011 NEC unless otherwise noted

  5. #5
    Join Date
    Jun 2005
    Location
    North Logan, Utah
    Posts
    7,950
    Quote Originally Posted by infinity View Post
    I want to agree with Chris but wonder if he has a resource that says it's not required? Maybe something from Carlon?
    HERE is a link to a gluing guide from Carlon. It makes no mention of primer being required, in fact it specifically states that you can't use primer on ENT when gluing fittings.

    Chris

  6. #6
    Join Date
    Apr 2006
    Location
    Simi Valley, CA
    Posts
    7,272
    As an inspector I've never required primer. What ever happened to the good old grey PVC glue? That would hide the purple.
    I can build anything you want if you draw a picture of it on the back of a big enough check.

    There's no substitute for hard work....but that doesn't mean I'm going to give up trying to find one.

    John Childress
    Electrical Inspector
    IAEI / CEI / C10
    Certified Electrical Inspector

  7. #7
    Join Date
    Jun 2005
    Location
    North Logan, Utah
    Posts
    7,950
    Quote Originally Posted by cowboyjwc View Post
    As an inspector I've never required primer. What ever happened to the good old grey PVC glue? That would hide the purple.
    I have never required primer either as I have never seen a requirement for primer on electrical PVC.

    Chris

  8. #8
    Join Date
    Jan 2009
    Location
    Easton, Maryland NEC: 2011
    Posts
    8,068
    My name is Derek, I am a primer, I have tried to stop, but I can't......just the way I am I suppose.

    PS. Yes I know it is not required, but I am too old to stop...
    "Electricity is really just organized lightning." George Carlin


    Derék

  9. #9
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    19,855
    Quote Originally Posted by jumper View Post
    My name is Derek, I am a primer, I have tried to stop, but I can't......just the way I am I suppose.

    PS. Yes I know it is not required, but I am too old to stop...
    Many plumbers around here do not even use primer on sewer pipes - same ones seldom use PVC for pressurized lines so can't speak for them on that. I was not brave enough on my own home and primed every joint. Of course I used the quick set cement like we normally use on electrical PVC, I think the plumbers are actually using something that is thicker and sets a little slower, it is kind of a creamy color.

  10. #10
    Join Date
    Feb 2003
    Location
    NE Arkansas
    Posts
    2,222
    Looks like we need a primer on primers

    First off, there's the matter of customer ... ignorance. They assume you need primer on the PVC, and if you were running rigid they'd expect you to use teflon tape! They just don't know any better .....

    While there is 'clear' primer available, I have never seen it in the store. What I do see is a clear 'cleaner,' which acts like a diluted primer .... it just doesn't seem quite as potent as the purple stuff.

    Oddly enough, the plumbing code requires the use of a colored primer to 'witness' that primer was used on the joint. The electrical code has no such requirement.

    As for the cements .... PVC cement can be made clear, or in any color you want. While there are some conventions followed to help identify different cements (especially those used for different materials), this 'color code' is nothing but a manufacturer convenience.

    What does matter -to us- is that PVC cements also come in different 'bodies' or thicknesses. The clear stuff we use has a somewhat lighter body than the 'medium body' cements in the plumbing aisle. The difference is directly related to the amount of PVC mixed in with the solvent. Thus, the heavier bodied cements cure slower and fill gaps better than the thinn-bodied ones.

    What also matters -to some of us, anyway- is that our cement needs to be listed for electrical use. I've only seen the clear stuff so listed. A pity, that, as I really like to use the grey stuff on grey pipe ... it just seems 'right.' IMO, we went a wee bit overboard with the listing requirement. (No surprise there).

    Personal preference? Well, until recently I skipped the primer. After all, it's not as if we're relying on the glue to keep the electricity in the pipe! A recent install has caused me to reconsider....

    I ran some PVC through a trench, then came up out of the ground. As luck would have it, the area around the trench was, after filling, subjected to additional digging and landscape work. One of my glue joints on the sweep failed, and it was a real PITA to fix it, as the wires were already present. Under the 'better safe than sorry' principle, I am now leaning towards using a primer to help 'Murphy proof" things. That the practice will assure the nervous customers, give me a chance to brag how much more thorough I am than the other guy, would be another 'plus.'

    I have to go, now. Morning break is approaching, and I need to fry some eggs on my charcoal-fired PVC bender ...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •