Threaded RMC into 2 gang w/p box

[StevenL1983]

Does installing threaded RMC wrench tight into the threaded female hub of a 2 gang weatherproof box meet the requirements for a wet location? I’ve got an inspector saying it need a Myers hub and is wanting documentation stating that out installation is ok.
Thanks

 

[Dennis Alwon]

If it is a threaded opening then the inspector is incorrect. Is the thread on top or bottom. I'll assume top but that should not make a difference. Put some silicone around the outside and see if that will make him happy.

 

[StevenL1983]

It’s on the side. It’s a 5 hole 1/2” KO box. It’s mounted is a manner that there are two holes on the right side and two on the left.

 

[Dennis Alwon]

Show him the box is listed for wet location

 

[StevenL1983]

Will do! Thanks

 

[Dennis Alwon]

Rmc is rated wet location, the box is rated wet location so I am not sure what he wants. If push came to shove you could use a wp locknut on the outside and thread into the box.

 

[infinity]

The Myers hub has straight threads designed for use with a locknut if anything using one of those would be a violation.

 

[petersonra]

The Myers hub has straight threads designed for use with a locknut if anything using one of those would be a violation.

I'm not even sure how you could make it work.

 

[electrofelon]

I’ve got an inspector saying it need a Myers hub and is wanting documentation stating that out installation is ok.
Thanks

Czeesh, isn't that what these Bell boxes are for? Outside? How does someone get their inspection license without knowing some of this ultra-basic stuff?

 

[Dennis Alwon]

And with the ko's on the side what is this inspector worried about. We generally use silicone on all threads just for extra security

 

[StevenL1983]

The Myers hub has straight threads designed for use with a locknut if anything using one of those would be a violation.

I know right? It’s a third party inspector on a data center site. They have to try to justify their paycheck. They throw a lot of you know what against the way and hope something sticks. It’s very frustrating

 

[roger]

I’ve got an inspector saying it need a Myers hub and is wanting documentation stating that out installation is ok.
Thanks

He may be masquerading as an inspector but he's clueless.

Roger

 

[Strathead]

If it is a Bell box, the instructions say the threads must be sealed, that means either Teflon tape or pipe dope at the time of installation IMO, not silicone around the fitting afterward. Not sure about an FS box.

 

[infinity]

If you're sealing the threads on a metal conduit it needs to be done in a way that does not impede the grounding continuity of the raceway.

 

[wwhitney]

If you're sealing the threads on a metal conduit it needs to be done in a way that does not impede the grounding continuity of the raceway.

But if the threaded connection is made up wrench tight, is it possible to interfere with the grounding continuity? E.g. if you put silicone in the threads before tightening, won't the wrench tight connection involve interference/deformation of the threads, resulting in metal to metal contact?

Cheers, Wayne

 

[petersonra]

But if the threaded connection is made up wrench tight, is it possible to interfere with the grounding continuity? E.g. if you put silicone in the threads before tightening, won't the wrench tight connection involve interference/deformation of the threads, resulting in metal to metal contact?

Cheers, Wayne

one would think so, but the code seems to think otherwise.

 

[Strathead]

If you're sealing the threads on a metal conduit it needs to be done in a way that does not impede the grounding continuity of the raceway.

I guess then that a green grounding conductor would be required, but what does that have to do with the fact that every Bell Box carries that instruction and that makes it a requirement to follow?

 

[wwhitney]

one would think so, but the code seems to think otherwise.

Citation?

When bonding threaded pressure pipe with joints made with dope, it is assumed that the joint will provide electrical continuity, so there is no need to jumper each fitting. Of course, the standard for bonding conduit may be higher than bonding other systems.

Cheers, Wayne

 

[electrofelon]

I guess then that a green grounding conductor would be required, but what does that have to do with the fact that every Bell Box carries that instruction and that makes it a requirement to follow?

Are you saying that Bell box instructions require a wire egc bonded to the box?

 

[Dennis Alwon]

Just to be clear we put silicone around the outside after the pipe is threaded in.