What is the main purpose of Phase II in elevator operation?

The main purpose of Phase II in elevator operation is to enable firefighters to control the elevators. This system is specifically designed to assist emergency personnel in managing elevators during a fire or other emergency situations, allowing them to safely access certain floors for rescue or fighting the fire. When Phase II is activated, firefighters have direct control over the elevator's movement and can override the standard automatic operations, ensuring they can reach the needed locations without interference from the building's fire safety systems, which might prevent elevator operation in certain situations for safety reasons.

The other options, while they may be relevant in various contexts of elevator operation, do not pertain to the primary function of Phase II. Automatic door operation is part of standard elevator functionality, security features relate more to the overall building systems rather than specific emergency operations, and energy consumption is typically not a consideration during emergency use where human safety is the top priority.