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Standard for Emergency and Standby Power Systems

This standard covers performance requirements for emergency and standby power systems providing an alternate source of electrical power in buildings and facilities in the event that the normal electrical power source fails. Systems include power sources, transfer equipment, controls, supervisory equipment, and accessory equipment needed to supply electrical power to the selected circuits.

Current Edition: 2022

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NFPA members and public sector officials may submit a question on an NFPA code or standard. Responses are provided by NFPA Technical Staff on an informal basis.
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Happy holidays! NFPA® will be closed December 24–January 2. Place your orders by Monday, December 12, to ensure domestic delivery by year end. We wish you all a safe and enjoyable holiday week, and look forward to assisting you in the new year.

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