Box Connection

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jumper said:
FS or FD box yes. But those are not knockouts, those are integral hubs.

What box/enclosure/cabinet are we talking about?
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Always thought hub was the ones that stick out of the box like this. Guess intergral mean within.
 

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So does this cover it for RGS connecting to enclosure. You either have concentric KO or threaded hub. Concentric KO you would need a meyers hub( or similar) to attach to the conduit. If threaded hub you can just terminate threaded end of conduit into hub OR use a meyer hub??
 

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Alos, so why is it sometimes I see RGS connected into a box with a fitting as you see and sometimes(with the same box) there is no fitting and just the end of the conduit going in. My guess is if they have to cut the conduit then instead of threading the conduit they just attach the fitting. Ding Ding Ding????
 

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314.15 says to prevent moisture from entering. Therefore, I will use "Myers" hub on top.

314.15 says to prevent moisture from accumulating. Therefore, I will use standard locknuts (or the "no-thread" connector mrlucky posted) on bottom.
 
mstrlucky74 said:
Ok last question:D:D. So are those fittings pictured different than meyers hubs? If so what's the difference between the two? Thanks
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Two things.

The myers hub is for threaded entry only and can be used anywhere on entering the enclosure.
It also has a sealing gasket.

The pic you posted is a compression fitting, no threads, and assuming that it is rated for a wet location could be used if entering below live parts. If above live parts one could possibly use such a fitting and and a sealing auxiliary fitting, seal ring or seal lock nut, I have from the sides but never at a top penetration.
 
jumper said:
Two things.

The myers hub is for threaded entry only and can be used anywhere on entering the enclosure.
It also has a sealing gasket.

The pic you posted is a compression fitting, no threads, and assuming that it is rated for a wet location could be used if entering below live parts. If above live parts one could possibly use such a fitting and and a sealing auxiliary fitting, seal ring or seal lock nut, I have from the sides but never at a top penetration.
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So the pic with the light......that fitting is not a threaded fitting? Isn't it this fitting which is threaded? I'm confused.
 

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mstrlucky74 said:
So the pic with the light......that fitting is not a threaded fitting? Isn't it this fitting which is threaded? I'm confused.
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It's a threadless compression fitting for RMC. You would use that fitting so that you did not need to cut and thread the RMC to length you just cut it and enter it into the connector, just like EMT.
 
mstrlucky74 said:
A NEMA 3R say about 30". Guess it could come with concentric KOs. So I guess they would have to do a field KO and use meyers hub.
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Just use a Myers hub in the top and bottom. You could use sealing locknuts too but IMO the Myers hub are better.
 
cdslotz said:
you've never heard of a threadless connector?
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Yes. So if you use a threadless connector and sealing locknuts you will have a watertight seal on the outside of the box where the connector makes contact? Or, I assume that what the sealing locknuts are for.
 
Dennis Alwon said:
I believe the factory Ko's would be at the bottom of the box and not on the top or sides
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mstrlucky74 said:
Yes. So if you use a threadless connector and sealing locknuts you will have a watertight seal on the outside of the box where the connector makes contact? Or, I assume that what the sealing locknuts are for.
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Sealing locknuts are intended for RGS/IMC. They are intended to go on the outside of the enclosure so the "seal" is on the exterior side of enclosure.

A "raintight" compression fitting will have a sealing washer that goes on the exterior side of the enclosure.

That is how these are listed, practicality of use and how long they hold up is a different story. Sealing washer on most raintight compression fittings I ever used are crap. I mostly quit using them because if you come back in a year or two you will find it has deteriorated from sunlight and the fitting isn't even seated tight at all - worse seal than a set screw fitting would have made:slaphead:
 
Sealing locknuts on RMC or IMC can go on either the inside or the outside but I agree with kwired the outside is better.
 
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