UPS where one or more electrical rotating machines provide the output voltage. May include two types: 1) Rotary UPS (RUPS) without Diesel which is a rotary UPS that does not contain an integral diesel engine to supply power to the load during an input power failure, and 2) Diesel-coupled rotary UPS (DRUPS), which is a rotary UPS that contains an integral diesel engine that may be used to supply power to the load during an input power failure.