iron conduit bodies

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petersonra

petersonra

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Northern illinois
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engineer
So I went to order some conduit bodies for use with EMT. I notice that the catalog says for use with rigid and IMC. Can these still be used with EMT? Obviously a connector would be needed to thread into holes.

I just never noticed this before.

Does anyone even make that style of fitting for EMT?
 
petersonra said:
So I went to order some conduit bodies for use with EMT. I notice that the catalog says for use with rigid and IMC. Can these still be used with EMT? Obviously a connector would be needed to thread into holes.

I just never noticed this before.

Does anyone even make that style of fitting for EMT?
Click to expand...

An EMT connector will thread into the same sized hole as rigid.
 
Connectors have not been investigated for use in threaded hubs. There are cast aluminum EMT conduit bodies, but I have never seen cast iron ones for EMT.
 
petersonra said:
So I went to order some conduit bodies for use with EMT. I notice that the catalog says for use with rigid and IMC. Can these still be used with EMT? Obviously a connector would be needed to thread into holes.

I just never noticed this before.

Does anyone even make that style of fitting for EMT?
Click to expand...

The conduit bodies that work with both RMC & EMT have a group of setscrews at each female threaded entry. The threading is for RMC, the setscrews are for EMT. Understand that the setscrew arrangement is not waterproof, so if in a wet location, you'll need a raintight EMT connector to screw in to each threaded entry.

If there is no group of setscrews at each thredded entry, it is only for use with RMC/IMC, or with a threaded connector / male adapter.
 
So therefore since EMT threaded fitting have not been investigated , then they are really not approved to work with bell boxes?
 
EMT fittings are not evaluated to work with any threaded hubs including those typically used in meter pans.
 
don_resqcapt19 said:
They have not been listed or tested for that application, but approval is up to the AHJ.
Click to expand...
Nailed it there. Lots of EMT or other straight threaded fittings are used in many places in threaded hubs - either the AHJ approves, or they don't realize they are not listed in the first place.

For those that question why this is even an issue - it mostly has to do with the fact that cut threads on RMC/IMC have a taper to the thread. Most other raceway fittings (like an EMT connector) have no taper to the threads and do not seat themselves in the same way in the hub(s) in question.
 
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