Unit heater 1 in Room 015 incorporates which type of conductor?

The unit heater in Room 015 incorporates a non-exposed conduit with a three-conductor cable, which is crucial for ensuring safety and electrical integrity. Non-exposed conduit provides protection to the wiring from physical damage and environmental factors, which is essential in areas like mechanical rooms where equipment may be located near other systems that could cause damage to wiring.

Using a three-conductor cable is significant because it typically includes two conductors for the current (usually a hot and a neutral) and a grounding conductor. This configuration helps in completing the circuit safely while also providing a ground path to prevent electrical shock or circuit malfunction. This design ensures that the unit heater operates properly with the necessary safety mechanisms in place.

In contrast, other options mention configurations that do not focus on the protective qualities of non-exposed conduit or do not provide the same level of electrical safety and functionality as the correct choice does.