RGS Cutting & Threading & Couplings

[Alwayslearningelec]

Question on the scenarios when these would used/done.

My thoughts.


1. If your stick of conduit needs to be cut and has to terminate in an enclosure( pull box, panel etc.).
2. If your not bending and using a prefab elbow( they are threaded on both ends) and you need to bend at a specific and have ot cut the conduit short. You would also need a coupling at one end of the elbow to join both threaded ends.
3. If you have you are running between two panels or panel and equipment I'd think the end of the run would almost never end with a full stick of conduit and thus cut, thread.

So with that said.

If you had a 200' run from panel to panel with 4 bends( pre fab elbows and pull box in the middle) you might very well have a cut, thread and coupling at each elbow and a cut/thread at the pull box and panel?

BTW- Bending might be a much better choice.

 

[LarryFine]

What is the question?

 

[Alwayslearningelec]

What is the question?

Sorry. Does what I said about the locations/situations those are needed make sense?

 

[synchro]

Threadless fittings might be usable depending on the situation.

 

[Strathead]

The one possible advantage to prebent elbows is that they are short enough to thread on. In some cases you may need to use a union. That said, I would prefer to bend my own than use factory elbows in your scenario.

 

[don_resqcapt19]

If you don't have bending and threading equipment, you use compression couplings and/or connectors on conduit that has been cut and reamed but not threaded. Note that compression connectors and couplings can only be used on unthreaded conduit ends.

 

[synchro]

If you don't have bending and threading equipment, you use compression couplings and/or connectors on conduit that has been cut and reamed but not threaded. Note that compression connectors and couplings can only be used on unthreaded conduit ends.

There are also set screw connectors for rigid but they seem to be less common.

For example:
https://www.garvinindustries.com/co...et-screw-box-connectors-malleable/p/MSNT-2754

https://www.garvinindustries.com/co...rigid-set-screw-box-connectors-steel/p/RS-500

 

[Alwayslearningelec]

If you don't have bending and threading equipment, you use compression couplings and/or connectors on conduit that has been cut and reamed but not threaded. Note that compression connectors and couplings can only be used on unthreaded conduit ends.

So you can use compression on RGS? Thought really just EMT.

 

[don_resqcapt19]

So you can use compression on RGS? Thought really just EMT.

No, they make compression connectors and couplings for rigid conduit.

 

[Alwayslearningelec]

So using those would eliminate a lot of threading. Wonder of the guys in my jurisdiction are using those. Spec would have to allow.

 

[infinity]

So using those would eliminate a lot of threading. Wonder of the guys in my jurisdiction are using those. Spec would have to allow.

Often the spec wants rigid because it cannot be pulled apart without physically breaking the threads. A threadless connector or coupling does not offer the same protection against breaking.

 

[Rick 0920]

We used to evaluate how well someone ran rigid by the number of Erickson's they used. If you have a Rigid 300 or power pony, cutting and threading is a breeze. If you bend short 90's, you can use the 90 as a crank and reduce the number of threadless or Erickson fittings.

 

[Chamuit]

Often the spec wants rigid because it cannot be pulled apart without physically breaking the threads. A threadless connector or coupling does not offer the same protection against breaking.

Environment may be a factor also.