Coast Guard Regulations (46 CFR), require electric hand lamps, approved for use in fuel tanks, to be battery powered and __________.

Correct Answer: Option D — explosion proof

46 CFR mandates that electrical equipment used in hazardous locations, such as fuel tanks, must be explosion-proof. This design ensures that any internal electrical arc or spark is contained within the housing, preventing the ignition of flammable vapors present in the surrounding atmosphere during tank inspections or maintenance.