251. Which type of portable electrical equipment is permitted for use in a compartment that is not gas free?

Only approved self-contained, battery-fed, explosion-proof lamps are permitted in compartments that are not gas-free. This equipment must be formally approved under U.S. Coast Guard regulations for hazardous locations, as the Master or OCMI lack the authority to approve such equipment. Other options are incorrect because they either lack formal approval or prohibit the use of necessary safety equipment.