Incandescent lamps are classified according to the shape of the bulb and the type of service, as well as the size and style of the base. How are incandescent lamps rated?

Correct Answer: Option A — operating voltage and wattage

Standard incandescent lamps installed aboard merchant vessels are classified by bulb shape, base style, and rated according to their design operating voltage and electrical wattage consumption, ensuring compliance with 46 CFR Subchapter J lighting circuit parameters.