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445.19(B)(C) Emergency Shutdown of Generator Prime Mover

Revision

Change Summary

  • This article separately addresses the emergency generator shutdown in one-and-two family houses and OTHER THAN one-and-two family houses.

    For other than 1-or-2 family houses a remote emergency stop switch to shut the prime mover shall be located outside the equipment room or enclosure.

    For 1-or-2 family houses the emergency shutdown shall be located outside the dwelling unit in a readily accessible location, except for cord-and-plug connected generators.

NEC®Text

Article 445 – Generators
445.19 Emergency Shutdown of Prime Mover.
(B) Remote Emergency Shutdown. For other than one- and two-family dwelling units, generators with greater than 15 kW rating shall be provided with a remote emergency stop switch to shut down the prime mover. The remote emergency stop switch shall be located outside the equipment room or generator enclosure at a readily accessible location and shall also meet the requirements of 445.19(A)(1) and (A)(2).
The remote emergency stop switch shall be permitted to be mounted on the exterior of the generator enclosure. The remote emergency stop switch shall be labeled Generator Emergency Shutdown, and the label shall meet the requirements of 110.21(B).
(C) Emergency Shutdown in One- and Two-Family Dwelling Units. For other than cord-and-plug-connected portable generators, an emergency shutdown device shall be located outside the dwelling unit at a readily accessible location and shall also meet the requirements of 445.19(A) (1) and (A)(2).
An emergency shutdown device mounted on the exterior of the generator enclosure shall be permitted to satisfy the requirements of this section. The shutdown device shall be marked as the Generator Emergency Shutdown, and the label shall meet the requirements of 110.21(B).

Material taken from the National Electric Code. is reprinted with permission from NFPA 70., 2023 edition. National Electrical Code®, Copyright 2022, National Fire Protection Association, Quincy, MA. All rights reserved.

Expert Analysis

A revision has been made to separate the generator emergency shutdown and disconnect requirements for clarity. Additional modifications are made to clarify the permitted locations for emergency shutdown devices and marking.

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