Emergency Power System
A backup power system that provides electricity during utility outages to maintain critical building operations.
Full Definition
An Emergency Power System is a backup power system that provides electricity during utility outages to maintain critical building operations. It typically includes generators, automatic transfer switches, and battery backup systems. Emergency power systems are required by building codes for life safety systems (fire alarms, emergency lighting, elevators) and may also support critical operations. These systems automatically detect power loss and transfer the building's electrical load to backup power. They require regular testing and maintenance to ensure reliable operation when needed, including monthly generator tests and battery maintenance.
Related Terms
Backup Generator
A standby power generator that automatically starts during utility outages to provide electricity to critical building systems.
Uninterruptible Power Supply (UPS)
A battery-powered system that provides immediate backup power during brief power interruptions.
Electrical System
The integrated network of electrical distribution equipment, circuits, and controls that deliver power throughout a building.