EMT in side Class 1 Div 2 area

[mooreaaryan]

What is the is with running EMT inside a class 1 div 2 area with compression watertight connectors. I am about to build a Methane plant isside a build in the midwest and the the prints indicate area is class 1 div 2. Also will my high bay lighting and receptacles be required to be rated class 1 div 2 by default.

 

[tortuga]

See NEC 501.10(B), you can use IMC with thread-less fittings, cablebus and MC among other wiring methods (with listed fittings), I dont see EMT in the list.
Presumably because if you had a accidental combustable gas leak the EMT W/rain tight is not air tight and might be a place gas could go, MC cant get filled with gas.
Sometimes you luck out and the lighting is out of the boundary

 

[kwired]

I've been involved with running EMT with compression fittings in class 2 div 2 but don't think you can with class 1 at all.

exception possibly if you pass completely through the classified area with no fittings, though that is probably a little rare.

 

[kwired]

See NEC 501.10(B), you can use IMC with thread-less fittings, cablebus and MC among other wiring methods (with listed fittings), I dont see EMT in the list.
Presumably because if you had a accidental combustable gas leak the EMT W/rain tight is not air tight and might be a place gas could go, MC cant get filled with gas.
Sometimes you luck out and the lighting is out of the boundary

Thread-less fittings for RMC/IMC use same design as EMT compression fittings, I don't see why that would be a factor, unless there is something out there more equivalent to "pro-press" fittings used on other piping that is listed for use as an electrical conduit fitting, but that isn't your typical thread-less fitting and should need more clarification to a certain type if it is allowed. JMO, didn't read section you quoted either so I could be missing something.

 

[rbalex]

Quite simply, EMT (with any form of connector) is not recognized as a suitable wiring method in Class I, Division 2 except as part of a nonincendive or intrinsically safe installation. It isn't included in Section 501.10 B(1). The poor wording in Section 358.10(A)(3) may give an incorrect impression but read it carefully.

 

[tortuga]

It is odd MC is allowed, but it has listed fittings for the location.
I have mostly just used Rigid or IMC in 'industrial' and EMT in 'commercial' and residential work.