RGC to RGC box

[wireday]

I need to make up a 1.5" LFMC to a RGC threaded box that has female threads. If I use a close RGC coupling installed into box wrench tight Is that considered sealed from water ? a RGC to LFMC transition female thread would go on the end of the close nipple. this is a wet area.Is it correct not to put any type of pipe dope or anything, that would effect bonding

 

[letgomywago]

Some liquid tight fittings are listed to go into the treaded ends I believe. I know it's on one brands FAQ about this. And no don't do anything that will insulate like pipedope you're using the metal stuff and need to bond it. The washer the connector comes with should keep water out but even so don't trust it with your life water always gets into boxes and conduit unless completely dry and indoors.

 

[jaggedben]

'Sealed from water' is vauge but if you mean raintight then I've always understood rigid threaded connections to be raintight. Suitable for outdoor wet locations where there are no special conditions.

... And no don't do anything that will insulate like pipedope you're using the metal stuff and need to bond it. ...

I concur.

 

[wwhitney]

I concur.

If you use a thread sealant on metal threads, and then make up the joint wrench tight, I would expect that the resulting joint to have metal to metal contact areas where all the thread sealant has been squeezed out. So is it really an issue?

Cheers, Wayne

 

[jaggedben]

Honest answer is I don't know, because I've never done it. But I do know from experience that water basically never gets into wrench tight rigid connections. So it's not necessary.

 

[letgomywago]

On the pipe dope insulating the bond completely I don't think it would because metal water pipe maintains continuity but the flex is already a poor bond in my mind why make it worse. If anything some silicone over the end wrench tight connector would be the safest and probably be overkill still.

 

[kwired]

We aren't required to put bonding jumpers around every threaded joint of a piping system that is required to be bonded when a thread seal is used on those joints. As mentioned there is still plenty of metal to metal contact in the threaded joint, the thread seal is there to fill any voids.

 

[Dsg319]

Crouse-hinds STL8. Doesn’t hinder electrical connection of conduit and will most likely satisfy your concerns.

 

[wireday]

Crouse-hinds STL8. says it is a lubricate nothing about water entry,

 

[Dsg319]

Crouse-hinds STL8. says it is a lubricate nothing about water entry,

As post #6 says, wrench tight everything and smear some silicone on the outside of the connections if it makes you feel better about the install.

Is it just outdoors or in a spray booth or something?

 

[kwired]

As post #6 says, wrench tight everything and smear some silicone on the outside of the connections if it makes you feel better about the install.

Is it just outdoors or in a spray booth or something?

Thread sealants are not supposed to be used for explosion proof enclosures. Might not seem right until one understands how they are supposed to work.

The idea is not to prevent an explosion, it is to contain it when it happens. Threaded entries are a place for the pressure from the explosion to escape, but it has to work it's way through the threads and by the time it reaches the outside environment it has cooled to a safe temperature it will not ignite any atmosphere on the outside.

Similar concept with enclosures with flat machined mating surfaces for a cover - the wide flange lets pressure through but is cooled by the time it reaches exterior. You are not supposed to use gaskets or any sealer on those surfaces.

 

[wireday]

'Sealed from water' is vauge but if you mean raintight then I've always understood rigid threaded connections to be raintight. Suitable for outdoor wet locations where there are no special conditions.


I concur.

As post #6 says, wrench tight everything and smear some silicone on the outside of the connections if it makes you feel better about the install.

Is it just outdoors or in a spray booth or something?

Inside, production area

 

[Dsg319]

Thread sealants are not supposed to be used for explosion proof enclosures. Might not seem right until one understands how they are supposed to work.

The idea is not to prevent an explosion, it is to contain it when it happens. Threaded entries are a place for the pressure from the explosion to escape, but it has to work it's way through the threads and by the time it reaches the outside environment it has cooled to a safe temperature it will not ignite any atmosphere on the outside.

Similar concept with enclosures with flat machined mating surfaces for a cover - the wide flange lets pressure through but is cooled by the time it reaches exterior. You are not supposed to use gaskets or any sealer on those surfaces.

That is true. With that said I would not worry about it after making wrench tight.

 

[don_resqcapt19]

If you use a thread sealant on metal threads, and then make up the joint wrench tight, I would expect that the resulting joint to have metal to metal contact areas where all the thread sealant has been squeezed out. So is it really an issue?

Cheers, Wayne

It is not an issue because those types of compounds, while providing some sealing action, are really intended to reduce the friction when the joint is tightened so that you can get the metal to metal contact between the tapered threads that is required to prevent leaks in piping systems.

 

[tthh]

Thread sealants are not supposed to be used for explosion proof enclosures. Might not seem right until one understands how they are supposed to work.

The idea is not to prevent an explosion, it is to contain it when it happens. Threaded entries are a place for the pressure from the explosion to escape, but it has to work it's way through the threads and by the time it reaches the outside environment it has cooled to a safe temperature it will not ignite any atmosphere on the outside.

Similar concept with enclosures with flat machined mating surfaces for a cover - the wide flange lets pressure through but is cooled by the time it reaches exterior. You are not supposed to use gaskets or any sealer on those surfaces.

I don't know about you, but I'm always fascinated when something is constructed so that it doesn't depend on the bad thing never happening, but how to survive with less or minimal or no damage when the bad thing does happen. I know when I first learned about explosion proof joints specifically requiring no sealants, I was like what?? no way...but it makes sense. Other things like when they started with signposts that break away when hit by a car and many other examples.