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Old 06-20-2010, 11:35 PM   #1
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How To Terminate PVC at Panel


Sooo, I'm trying to terminate 2" schd 40 pvc at an electrical panel. I purchased a pvc male thread adapter, thinking I'd pop it into the box, glue on the pvc and put a lock nut on the threaded part inside the box. I bought rigid conduit locknuts... they don't fit. Sooo I'm scouring the web, and I can't even find a 2" lockunt for PVC anywhere! Mayb I'm not looking in the right place... But it doesn't even look like carlon makes one...? Could someone post a link to one? Also, I've come across the concept of using a female adapter with a chase nipple. I'm also having a difficult time locating a chase nipple that is meant for PVC. Can I use a regular metallic one? does it need to be grounded? if so, how? Thanks in advance for the replies, and please post links to examples, as I'm not quite up on the lingo yet! Thanks again.
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Old 06-21-2010, 12:14 AM   #2
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Is this what you have? If so, a standard locknut should work:
https://www.hardwareworld.com/PVC-Te...h-p38H2I4.aspx
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Old 06-21-2010, 06:48 AM   #3
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Your sch 40 is grey electrical PVC and not white plumbing PVC, right?
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Old 06-21-2010, 07:36 AM   #4
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yep that's the one I have (at least it looks the same). The locknuts I bought (from menards) were labeled "rigid" so they'd be intended for rigid metal conduit. They are too large for this application. should they all be standard?
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Old 06-21-2010, 07:39 AM   #5
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I've used the metal "Rigid" locknuts on 1/2" and 3/4" gray electrical conduit. I did it with PVC male adapters, just like you're doing...worked fine...I bought the stuff from Lowe's.
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Old 06-21-2010, 09:25 AM   #6
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The "rigid" locknuts will work with the PVC threaded adapters... just make sure you got the right size. Also, be aware that the PVC threads are easily damaged by crossthreading.
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Old 06-21-2010, 05:21 PM   #7
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So I went back to menards today, trying to figure out what was going on, so I played dumb and just asked the guy "how do I attach conduit to a box" and he said use a male adapter, locknut and inulating bushing. This is what I was hoping/expecting to hear so I sprang my trap, and said no, they don't fit. So we walked over to that section and I proceeded to pull a locknut out of a bag and put it on a male adapter. Crap. it fits. What was I doing wrong with the ones at home? so I came home and sure enough I wasn't going crazy. I tried the locknut on the male adapter that I have, and the locknut goes at least 3/8" onto the male adapter without engaging the threads. Something isn't right with either the adapter or locknut that I have. I'm gonna go back tonight with my locknuts and try them on an adapter or two.
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Old 06-21-2010, 05:47 PM   #8
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You don't have an 1 1/4 adapter and an 1 1/2 lock nut do you?
I found a 1 1/2 ring it is quite a bit bigger than a 1 1/4 so this wouldn't be it. You will have to let us know what you find out when you get back from Menard's. BTW the threads are all standard tapered pipe threads.

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Old 06-21-2010, 07:15 PM   #9
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Bleh. I brought my lock nuts back to menards and tried them on other adapters. I think I'v just got the pleasure of having lock nuts that are slightly large, and an adapter that is slightly small resulting in a very poor fit. Seems someone could come up with a better fitting than this combo... It'd be nice to get a 2" chase nipple made of PVC and use a femal adapter!!!
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Old 06-25-2010, 10:08 PM   #10
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I just ran my 2" conduit yesterday. Used 2" metal lock washer w/pvc bushing. Inspector had no issues.
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