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What Is NFPA 111?

NFPA 111 is the National Fire Protection Association standard for stored electrical energy systems and stored emergency power supply systems (SEPSS). This standard was developed to address the differences in the several power sources in emergency and standby power systems, to include information about equipment.

  1. Function

    • Because electrical power sources may fail, NFPA 111 defines standards for the way that an alternate source of power should be stored within buildings and facilities as electrical energy systems. Administration--scope, application and function--definitions, classification of stored emergency power supply systems (SEPSS)--type, class, category and level--emergency supply sources and converters, transfer switches and protection, installation and environmental considerations, maintenance and operational testing and material are covered by NFPA 111.

    Additions

    • Information about battery cell types other than lead-acid, including nickel-cadmium and nickel metal hydryde, has been included in NFPA 111. Revisions have been made from NFPA 110 involving requirements for ventilated areas having electrochemcial energy storage devices, since flammable gases other than hydrogen may relate to energy sources that are not batteries.

    Exclusions

    • According to Nfpa.org, nuclear sources, wind stored energy systems, solar energy systems, distribution wiring, application of the SEPSS, systems having outputs of less than 500 VA or 24 V--systems lower than Class 0.033--and power systems that cannot be interrupted are not included in the NFPA 111 standard. In addition, NFPA 111 neither assigns type, class or level to a load nor loads to be served by an SEPSS. All of these factors set the boundaries of NFPA 111.

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