Individual wires, used in systems greater than 50 volts, __________.

Correct Answer: Option A — must be installed in conduit

46 CFR 183.330 requires that individual wires in electrical systems operating at voltages greater than 50 volts be installed in conduit. This provides essential mechanical protection for the conductors, preventing damage, short circuits, or potential electrical fires, thereby ensuring the overall safety and reliability of the vessel's electrical distribution system.