Keith Lane, P.E. RCDD/NTS Specialist, LC, LEED AP, Vice President, Engineering, SASCO, Seattle

UPS: On the Power Quality Frontline

A UPS is typically installed between a power supply and a critical load to prevent power anomalies from affecting that load. UPS can be classified under one of three technologies. Off-Line Off-line UPS systems use a transfer switch for a system bypass. They also include a rectifier (to convert AC to DC), a battery charger, a battery and an inverter (to convert DC to AC).