Uninterrupted Power Supply (UPS)

Published February 2000

An electrical power system for a building or an area within a building in which incoming AC power is converted to DC power, stored in batteries and then converted back to AC electrical power to supply building equipment. In the event of an external power failure, power is provided without interruption for a specified length of time from storage batteries. For computer installations, the UPS system performs the additional function of filtering incoming power through the battery packs.