Associate Safety Professional Practice Exam

Which of the following is not correct concerning electrical wiring and equipment in hazardous locations according to the NEC?

1. Spray paint booths are Class I, Division I, group G locations

2. Gas stations are Class II, Division II locations

3. Flammable liquid storage areas are Class I, Division I locations

4. Grain elevators are Class II, Division I locations

The correct answer is: Spray paint booths are Class I, Division I, group G locations

In the context of the National Electrical Code (NEC), understanding the classification of hazardous locations is crucial for maintaining safety standards. The classification of areas where flammable gases, vapors, or dusts may be present determines the necessary precautions for electrical installations. Spray paint booths, contrary to the statement in the answer, are classified as Class I, Division 1 locations due to the presence of flammable vapors during the spray operation. These environments require equipment that can safely operate without igniting the flammable substances in the air. Gas stations are correctly identified as Class II, Division II locations where hazardous materials in the form of dusts may be brought into contact with electrical equipment during normal operations, but they are typically located in areas with a lower risk of ignition than Class I locations. Flammable liquid storage areas are appropriately classified as Class I, Division 1 locations, recognizing the constant potential for flammable vapors in such environments, which necessitates careful electrical installation to mitigate ignition risks. Grain elevators are indeed considered Class II, Division 1 locations due to the potential for the accumulation of combustible dust from the stored grains, making their classification appropriate in terms of safety measures needed for electrical equipment. The classification system is vital for ensuring that electrical