PVC Junction Box

[infinity]

Are you permitted to use these boxes with a terminal adapter and a metal locknut?

 

[hillbilly1]

Is this a trick question? PVC TA?

 

[LarryFine]

I do. Use O-rings if there's a concern.

 

[infinity]

Is this a trick question? PVC TA?

TA's use metal locknuts, can they be used in a PVC box where the locknuts will not be bonded?

 

[jap]

The chances of a locknut becoming energized in a completely PVC surrounding would be slim to none in my book.


JAP>

 

[Chamuit]

Why do the locknuts need to be bonded? If I ran LTNM flex in and used an NM connector (with a metal locknut), I wouldn't have to bond it.

 

[infinity]

The chances of a locknut becoming energized in a completely PVC surrounding would be slim to none in my book.


JAP>

I agree and I feel the same way about a pan head mounting screw inside of the but those aren't permitted either.

Maybe I'm overthinking this. I'm assuming that any metal part within the box would be required to be bonded.

 

[Chamuit]

Not trying to be a smart aft, but, do you bond the cover screws? They are actually on the outside where they can be touched.

 

[infinity]

Not trying to be a smart aft, but, do you bond the cover screws? They are actually on the outside where they can be touched.

I'm looking for feedback so nothing wrong with thinking outside of the box. The cover screws cannot contact the conductors inside of the box so there is no issue with them.

 

[Chamuit]

I'm looking for feedback so nothing wrong with thinking outside of the box. The cover screws cannot contact the conductors inside of the box so there is no issue with them.

10-4. Don't know if this applies, or is legal, I have used a PVC reducer bushing into a PVC coupling with cement to secure pipe coming into a PVC box. 1x3/4 bushing into 1"coupling with 1x3/4 bushing to conduit. pretty watertight.

 

[jap]

I agree and I feel the same way about a pan head mounting screw inside of the but those aren't permitted either.

Maybe I'm overthinking this. I'm assuming that any metal part within the box would be required to be bonded.

Not sure what you mean by this.

JAP>

 

[infinity]

Not sure what you mean by this.

JAP>

You cannot drill a hole in the back of the box and use screws to mount it.

314.43 Nonmetallic Boxes. Provisions for supports or other mounting means for nonmetallic boxes shall be outside of the
box, or the box shall be constructed so as to prevent contact between the conductors in the box and the supporting screws.

 

[hillbilly1]

I agree and I feel the same way about a pan head mounting screw inside of the but those aren't permitted either.

Maybe I'm overthinking this. I'm assuming that any metal part within the box would be required to be bonded.

The reason the screws inside are not allowed is it affects the sealing of the box, water can enter at those points.

 

[infinity]

The reason the screws inside are not allowed is it affects the sealing of the box, water can enter at those points.

The code section I posted in post #12 states that the reason is "to prevent contact between the conductors in the box and the supporting screws".

 

[AC\DC]

I am sure you already thought of this but what about a box adapter

CARLON E996E 3/4 PVC BOX ADPT | Gordon Electric Supply, Inc.

CARLON E996E 3/4" PVC BOX ADAPTER

www.gordonelectricsupply.com

Then no lock nut

 

[Carultch]

I am sure you already thought of this but what about a box adapter

CARLON E996E 3/4 PVC BOX ADPT | Gordon Electric Supply, Inc.

CARLON E996E 3/4" PVC BOX ADAPTER

www.gordonelectricsupply.com

Then no lock nut

One problem with the PVC box adapter is that it is irreversible. To have an all-plastic solution that can be reversibly disassembled, I'd recommend a plastic locknut on a PVC male adapter.

 

[wwhitney]

So what section would require bonding of the locknut? One could, of course, use a grounding locknut if it is required to be bonded.

Cheers, Wayne

 

[Little Bill]

I use these boxes all the time with a TA and locknut, never a word said by an inspector.

 

[hbiss]

Are you permitted to use these boxes with a terminal adapter and a metal locknut?

Only way I've ever seen it done. It seems the only other way is with a box adapter and glue. Do they even make a plastic locknut? All I find is plastic bushings.

-Hal

 

[jap]

You cannot drill a hole in the back of the box and use screws to mount it.

That's interesting ,,,,, and makes no sense to me.


Jap>