NFPA 111-2025 Standard on Stored Electrical Energy Emergency and Standby Power Systems
Chapter 6: Transfer switches and protection – NFPA 111-2025 Standard on Stored Electrical Energy Emergency and Standby Power Systems

NFPA 111-2025 Standard on Stored Electrical Energy Emergency and Standby Power Systems 6.2.5: 6.2.5 Nonautomatic transfer switches

Nonautomatic switching may be controlled locally or remotely, stays in its alternate state while the command is applied and returns to its preferred state when the command stops; reliable mechanical or approved interlocking stops any two sources being connected together, and two labelled pilot lights or another approved indicator show position.

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  • 6.2.14-6.2.16 6.2.14 to 6.2.16 Motor load transfer, neutral isolation and nonautomatic switches

Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.

Other controls in Chapter 6: Transfer switches and protection – NFPA 111-2025 Standard on Stored Electrical Energy Emergency and Standby Power Systems

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