What is the primary purpose of emergency power systems in buildings?

The primary purpose of emergency power systems in buildings is to provide electrical power for life safety systems. These systems are crucial during emergencies, such as fires or power outages, as they ensure that critical safety mechanisms remain operational. Life safety systems include fire alarms, emergency lighting, exit signs, and smoke control systems, all of which are essential for the safe evacuation of occupants and the overall safety of the building.

When the regular power supply is interrupted, emergency power systems kick in to ensure that these life-sustaining functions are maintained, thereby minimizing risks to occupants and enabling effective emergency response. Other options may suggest scenarios that are not aligned with the primary mission of emergency power, which is centered around life safety and addressing emergency conditions rather than general comfort or convenience.