To prevent moisture from accumulating in hazardous wet locations, which device is used?

• A. Drain plug
• B. Moisture barrier
• C. Dehumidifier
• D. Drain seal

Answer: (D)

Moisture control in hazardous wet locations relies on preventing water from entering or gathering around electrical equipment. A drain seal is used to seal drain openings, blocking the path through which water could drain into or accumulate in the area where equipment sits. This helps keep the immediate environment around the equipment drier and reduces the chance of moisture-related problems.

A drain plug would simply block a drain and could trap water rather than keep areas dry. A moisture barrier protects against moisture moving through walls or enclosures but doesn’t address moisture that’s already in or around a drain in a wet location. A dehumidifier removes moisture from the air, but in hazardous wet locations it’s often impractical or unsafe to rely on such equipment, and it doesn’t directly control moisture entering through drainage paths.