Transitioning from PVC conduit to NM

[Grahams315]

Hi all, My new-to-me garage has a surface mount subpanel with some existing outlets ran though PVC conduit on a finished wall. I am looking to run 2 additional circuits to the unfinished walls that will require running more pvc conduit to a junction box to tie the THHN to NM that will be run through the walls that eventually will be finished.

I'd prefer to use PVC to match the existing conduit but I am struggling to find any pvc fittings for the transition of NM into the PVC junction box.

Any guidance is appreciated.

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[Stuart in MN]

NM usually means non-metallic conduit, which would be PVC...are you referring to transitioning to flexible conduit?

 

[Grahams315]

Apologies, I'm referring to NM cable or Romex. One the hard pvc conduit gets to the unfinished wall I'll be running romex through the studs to each box.

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[exranger06]

Couple of different ways:
1. Run PVC conduit to a metal junction box with knockouts, use a regular 2-screw cable clamp for the NM cable. Connect a bonding jumper to the metal box

2. Install a PVC box that has knockouts and install a 2-screw cable clamp with a bonding locknut and connect a bonding jumper to it.

3. Install a PVC box that has knockouts and install a plastic "button" type cable clamp

4. Install a PVC box that has the "trap doors" for sliding NM through instead of knockouts. Drill a hole in the box (make your own knockout) for the conduit.

 

[Grahams315]

Couple of different ways:
1. Run PVC conduit to a metal junction box with knockouts, use a regular 2-screw cable clamp for the NM cable. Connect a bonding jumper to the metal box

2. Install a PVC box that has knockouts and install a 2-screw cable clamp with a bonding locknut and connect a bonding jumper to it.

3. Install a PVC box that has knockouts and install a plastic "button" type cable clamp

4. Install a PVC box that has the "trap doors" for sliding NM through instead of knockouts. Drill a hole in the box (make your own knockout) for the conduit.

Thanks! Number 3 was what I was thinking of, but pvc boxes with knock outs seem to be harder to find than I thought. Any issues with getting a standard surface mount box and drilling my own "knock out" into it?

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[AntonLargiader]

Seems to me to u could also use a box with threaded holes, and screw an NM clamp into one of the holes. Run PVC into it with a threaded fitting. Pretty much the same as using a metal box but without the nuts.

It isn’t clear to me how you want to transition (surface mount or flush) so I can’t picture exactly how it would look for your case. I recently installed recessed receps in a brick wall with a similar concept.