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409.70 Surge Protection for Safety Circuits in Industrial Control Panels

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Change Summary

  • New section calls for surge protection of safety circuits within control panels.

NEC®Text

Article 409 Industrial Control Panels
409.70 Surge Protection. Safety circuits for personnel protection that are subject to damage from surge events shall have surge protection installed within or immediately adjacent to the control panel.

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 new section has been added to clarify that surge protection shall be installed within or immediately adjacent to the control panel to protect safety circuits for personnel protection. The surge protective devices address a documented safety issue that has been reported by the Electrical Safety Foundation.

Figure 1

Leviton Solution
51120-1
Type 2 Single Phase Surge Panel with 4-Mode Protection

120/240V Single Phase Panel Mount Surge Protective Device, 4-Mode Protection, 50kA Max Surge Current Rating, NEMA 1 Enclosure, UL 1449 4th Edition Type 2.

Leviton’s Surge Protection Devices can be used individually or as part of a coordinated application strategy, to protect sensitive electronic equipment, in industrial, commercial and residential locations, from the stress and degradation inflicted by voltage transients. Transients are diverted away from sensitive micro circuitry, providing protection against catastrophic failure, costly downtime and data disruptions.

 

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