No. The definition of Class 2 - Division 2 is - Where ignitable concentrations of combustible dust are present within the atmosphere under abnormal operating conditions. A threaded metal conduit orcables approved for hazardous locations must be used. This eliminates the use of EMT (Electrical Metallic Tubing).
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Ah, multiplication?
Only first-class. Second-class would not have even known it existed.
The GCF of 10 and 15 is 5.
The GCF is 1.
It works out as 17