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722, 724, 726 Cables for Power-Limited Circuits and Fault-Managed Power Circuits

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Change Summary

  • Power limited circuits are being utilized more often due to emerging new technologies like Power Over Ethernet (POE) and others. The NEC recognizes this and revised/added new text to ensure best installation practices.

    Since Articles 722, 724 and 726 are entirely new, they are too lengthy to include in this guide. This guide serves to make you aware of the new articles and their scope. If you work in these areas you are best served to read the complete text in the NFPA70.

NEC®Text

Article 722 Cables for Power-Limited Circuits and Fault-Managed Power Circuit.
Part I. General
722.1 Scope.
722.3 Other Articles.
722.10 Hazardous (Classified) Locations.
722.12 Uses Not Permitted.
722.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
722.24 Mechanical Execution of Work.
722.25 Abandoned Cables.
722.31 Safety-Control Equipment.
722.135 Installation of Cables.
Part II. Listing Requirements
722.179 Listing and Marking of Cables

Article 724 Class 1 Power-Limited Circuits and Class 1 Power-Limited Remote-Control and Signaling Circuits.
724.1 Scope.
724.3 Other Articles.
724.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
724.24 Mechanical Execution of Work.
724.30 Class 1 Circuit Identification.
724.31 Safety-Controlled Equipment.
724.40 Class 1 Circuits.
724.43 Class 1 Circuit Overcurrent Protection.
724.45 Class 1 Circuit Overcurrent Device Location.
724.46 Class 1 Circuit Wiring Methods.
724.48 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway.
724.49 Class 1 Circuit Conductors.
724.52 Circuits Extending Beyond One Building.

Article 726 Class 4 Fault-Managed Power Systems.
Part I. General.
726.1 Scope.
726.3 Other Articles.
726.10 Hazardous (Classified) Locations.
726.12 Uses Not Permitted.
726.24 Mechanical Execution of Work.
Part II. Class 4 Circuits.
726.121 Power Sources for Class 4 Circuits.
726.122 Class 4 Loads.
726.124 Class 4 Marking.
726.130 Terminals and Connectors.
726.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit, and Medium-Power Network-Powered Broadband Communications Cables.
726.139 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly.
726.144 Ampacity
Part III. Listing Requirements.
726.170 Listing of Equipment for Class 4 Systems.

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

New articles have been added to address:

  • Cables for power-limited circuits, fault-managed circuit, Optical Fiber.
  • Class 1 power-limited circuits and Class 1 power-limited remote-control and signaling circuits.
  • Class 4 fault-managed power systems.

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