First responders should become familiar with the U.S. Department of Transportation (DOT) hazard classes for hazardous materials and the placards and labels used to identify those hazards. This ...

A hazardous (classified) location is an area where the possibility of fire or explosion exists because of flammable or combustible gases or vapors, combustible dusts, or easily ignitable ...

When you're looking for answers on hazardous (classified) location questions, where should you turn? Think of Articles 500 through 517 as a mini codebook dedicated specifically to that subject.

Sometimes electrical equipment must be installed in areas where combustible vapors and gases are used or may be present. These are commonly referred to as "hazardous locations" and are defined by the ...