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  • Electric power systems designed to automatically supply independent, continuous, reliable electric power to critical devices (e.g., operating room, critical care devices) after a pre-established time delay (e.g., 10 or 60 seconds) when the line power supply has complete blackouts or does not perform acceptably . These systems should supply electric energy during a long period of time (usually several hours or a few days) without being refueled. Emergency power systems usually consist of a rotary energy converter, including its accessories (e.g., starting, cooling, and control systems) and other devices, such as transfer switches, needed to ensure proper operation.
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