Uninterruptible Power Supply. The Facility shall include one primary UPS system for the major plant control system. The UPS system shall be supplied with 30% spare capacity above calculated requirements. The output rating of the UPS system(s) shall be 120 V, single‑phase, 0.8 lagging PF to 1.0 PF, at 40°C ambient. UPS will be a true AC-DC-AC conversion type consisting of an inverter, with an alternate DC source supplied from the station service batteries, a rectifier and a static transfer switch. The static transfer switch will be connected to a second inverter as the alternate supply. Output of the UPS and the second inverter will connect to a manual maintenance bypass switch to the instrument AC panelboard.
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Sources: Purchase and Sale Agreement, Purchase and Sale Agreement