Which three types of wires are connected to a hall lantern?

The selection of up, down, and common as the correct types of wires connected to a hall lantern can be understood in the context of how hall lanterns function within the elevator system. Hall lanterns serve as visual indicators to show the direction of an approaching elevator, and they are typically connected to the control system that manages the elevator's operation.

The up wire is responsible for lighting the indicator when the elevator is approaching from below and moving upwards towards that floor. Conversely, the down wire activates the indicator when the elevator is approaching from above and moving downwards. The common wire serves as a return or ground path for these signals, allowing the lantern to function correctly.

This setup ensures that passengers receive clear and immediate visual information regarding the elevator's direction, enhancing safety and convenience. Therefore, the correct answer encompasses the essential types of connections utilized to operate the hall lantern effectively.