On center opening doors, which door usually actuates the gate switch?

The gate switch on center opening doors is typically actuated by the trailing door. This is because the trailing door is the last to enter the doorway, which ensures that it correctly identifies when the door is closed and helps to maintain safety protocols for the elevator system. The activation of the gate switch is crucial for preventing the elevator from moving while the doors are not completely closed, thus ensuring passenger safety.

In contrast, leading doors primarily facilitate access into or out of the cab but do not trigger the safety mechanisms associated with the door's closure as effectively as the trailing door. Similarly, while assigning functions to the left or right doors might seem plausible in certain configurations, it does not accurately represent the standardized operation of center opening doors where the trailing door is responsible for actuating the gate switch.