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Area Classification requirement of a Gen-set

I have a CAT gas fired generator in an enclosure which is located in a non-classified area. The question has come up whether the instrumentation and electrial devices inside the enclosure need to be Class 1, Div 2 rated due to the fact that the unit does have a fuel gas supply (80psig) to the engine. I would appreicate if anyone had experience with this type of situation if you could provide some insigh