The NEC will tell you what motors and other equipment are acceptable for the area classification the equipment is going to. Take a close look at articles 500 and 501. we really cannot select or design equipment for you from 10,000 miles away and only knowing bits and pieces of what you are doing.
Normally when you buy something like a compressor that is going into a classified area you would buy it designed to be suitable for the classification of the area. It pretty much either is or is not suitable as you bought it. The manufacturer should be able to tell you whether it is suitable or not. If they can't tell you it is suitable, it probably is not.
Bob thanks for help.
I Found a hard copy for UL 1203 but I did not find a reply for the relation between UL 1203 in C1D2 because this standard talks about enclosure test, thickness,pressure test, temp test...without specifying any details about the requirements for anything except enclosures.
Also your reply is clear like 501.1 Scope.
thanks a lot.