NFPA 110-2025 Standard for Emergency and Standby Power Systems
Chapter 8: Routine maintenance and operational testing – NFPA 110-2025 Standard for Emergency and Standby Power Systems

NFPA 110-2025 Standard for Emergency and Standby Power Systems 8.4.6: 8.4.6 Monthly transfer switch operation

Transfer switches are operated monthly by electrically moving them from the primary to the alternate position and back. Where several ATSs serve a system, the switch used to start the monthly test is rotated so every switch is proven over time.

Maintained by Gerard Blokdyk

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  • 17.81-17.83 Monthly on-load generator test of at least one hour including changeover

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Other controls in Chapter 8: Routine maintenance and operational testing – NFPA 110-2025 Standard for Emergency and Standby Power Systems

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