Terminating RMC

[Alwayslearningelec]

So am I correct in saying when you terminate RMC into a box/enclosure you could have the following terminations?

1. Locknut & bushing
2. Hub on end of conduit which would go into a knockout
3. Female hub on box so you would just thread the conduit into the hub?

 

[infinity]

1) Almost always two locknuts.
2) Myers style hub yes.
3) Yes.

 

[Alwayslearningelec]

1) Almost always two locknuts.
2) Myers style hub yes.
3) Yes.

Thought so.

 

[synchro]

You could also use a threadless compression or setscrew connector made for RMC.

 

[tom baker]

I had some 1/2” metal bushings and would use with one locknut. Not sure where they came from.

 

[don_resqcapt19]

I had some 1/2” metal bushings and would use with one locknut. Not sure where they came from.

Had those in 1/2 and 3/4 and most, but not all were insulated throat.

There is a company now, Kist Corp, that makes them in multiple sizes and the metal surface is smoothly rounded and there is no need for an insulated throat.

 

[Eddie702]

a bushing and 1 locknut are still ok as far as I know but If I recall that is for 250 volts to ground or less. 480 needs two locknuts

 

[don_resqcapt19]

a bushing and 1 locknut are still ok as far as I know but If I recall that is for 250 volts to ground or less. 480 needs two locknuts

The bushing I provided a link to is listed as both a bushing and a locknut, so, even on 480, you can use that bushing with a single locknut.

 

[Joethemechanic]

Had those in 1/2 and 3/4 and most, but not all were insulated throat.

I have a bunch of really old ones here 1/2 and 3/4 no throat insulation. I'm not sure what they are made of. non magnetic, and not aluminum. it almost looks like heavily tarnished brass