0

I'm running 3/4" Schedule 80 PVC conduit above ground for some backyard electrical. There is a section where I need to go up a retaining wall to a receptacle box, and then back down to continue the run.

It's complicated to do straight runs here and I really think the best way for me to do this is to use flexible liquid-tight conduit at the receptacle box, but I can't figure out how to connect the straight sch 80 PVC pipe with the flexible liquidtight conduit. All the connectors I'm finding online show a compression bushing for the liquidtight and external threads with locknut for outlet box (which I can use for the box). But I'm looking to do conduit<->conduit.

Addendum: The conduit body + liquidtight coupler looks like it would solve my issue? (at minute 3:00) https://youtu.be/QcxWw_M6uVE?t=180

  • 2
    If I follow what you want to do you will probably need a threaded coupling to screw the connector in. – Ed Beal Oct 4 '20 at 16:54
  • 3
    Why restrict yourself to straight runs? PVC can be heat bent (or you can buy sweeps pre-made.) Liquidtight is extremely expensive and possibly the worst conduit I've ever met for pulling through. – Ecnerwal Oct 4 '20 at 17:01
  • 1
    @EdBeal your comment improved my web search and I found this pvcfittingsonline.com/… – dabi Oct 4 '20 at 19:21
  • @dabi -- the link you found is to the plumbing flavor; the electrical version of that is a thing, but may or may not be compatible with the male threads on LFNC connectors – ThreePhaseEel Oct 4 '20 at 22:31
  • The male thread on the lfnc is a standard pipe thread but if a inspector sees white not grey he will probably flag it. – Ed Beal Oct 5 '20 at 13:40
2

Don't use flexible conduit for your application.

PVC is very easy to bend. I use an electric heat gun like the kind you use for stripping paint. The great thing about bending it is those bends remain water-tight and save you money on couplers.

If you decide to do a conduit-coupler-conduit connection you don't need a threaded connection with gaskets. You need a PVC coupling. You can connect them together by PVC-welding (it's like gluing), the same way PVC plumbing pipes are connected. Notice the small amount of goo that dropped out of the connection when I welded this PVC conduit to the fitting for the box it goes into. Check YouTube for videos on how to do this; it's really easy. Don't get the stuff on your hands (that's why I'm wearing a latex glove in the photo) and don't inhale it.

tools I used to bend PVC conduit

conduit PVC-welded to outlet box

picture showing pvc conduits coupled together

  • 1
    Note that LFNC is NOT rated for use with PVC couplers! – ThreePhaseEel Oct 4 '20 at 19:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.