The NEC has "T" rating for electrical equipement that is to be used in classified areas. Basiaclly the "T" rating is determined by the max skin temperature of the operating equipment. This temperature needs to be below the auto ignition temperature of normal process vapors or dust. With new...
Area classification and T -rating. I see electrical equipement with "T" ratings. What about standard motors? Is it proper to use the insulation class plus a 20 degree hot spot to dervie a "T" rating?
