What allows an elevator to register and hold calls in the opposite direction during an emergency?

In elevator systems, Fire Phase II is the function that specifically allows an elevator to register and hold calls in the opposite direction during an emergency situation. This is particularly important in a fire or emergency scenario, as it enables occupants to safely evacuate the building by allowing them to access the nearest exit rather than being restricted to the elevator’s conventional operation, which is generally programmed to prioritize calls in a specific direction.

During Fire Phase II, trained personnel, such as firefighters, can gain control of the elevator, overriding normal call controls. This allows them to ensure that the elevator can respond effectively to emergency needs, such as providing access for rescue or evacuating individuals from dangerous areas. Therefore, the elevator can strategically stop at designated floors to assist in the emergency evacuation process, while still managing calls in the opposite direction.

The other options do not provide the same level of functionality required in emergencies. For instance, the emergency stop system is meant for halting the elevator’s movement but does not have the capability to manage calls in reverse. Fire Phase I typically involves sending the elevator to a specific floor and grounding it upon detection of fire, rather than allowing call management. The call cancel feature simply allows users to cancel their calls but does not relate to emergency protocols.