What action triggers manual operation of elevators in fire situations?

Turning the car switch to "Firemen Service" is the action that triggers manual operation of elevators in fire situations. This specific mode, also known as Phase I emergency service, is designed to allow firefighters to take control of the elevator for safe and efficient access to different floors during an emergency. When this mode is activated, it typically involves the elevator returning to a designated floor (often the ground floor or a predetermined area) and then allowing firefighters to use it for their operations, thereby preventing unauthorized use of the equipment during a critical situation.

This procedure is essential because it enhances safety and ensures that only trained personnel are operating the elevators in potentially dangerous conditions, allowing for better management of resources and helping those in need while minimizing risks to both residents and first responders.