NFPA 111: Standard on Stored Electrical Energy Emergency and Standby Power Systems
Current Edition: 2016 Next Edition: 2019

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What is NFPA 111?
NFPA 111: Document Scope

1.1 Scope. 1.1.1* This standard shall cover performance requirements for stored electrical energy systems providing an alternate source of electrical power in buildings and facilities in the event that the normal electrical power source fails. A.1.1.1 For emergency power systems supplied by emergency generators, see NFPA 110, Standard for Emergency and Standby Power Systems. 1.1.2 Systems covered in this standard shall include power sources, transfer equipment, controls, supervisory equipment, and accessory equipment, including integral accessory equipment, needed to supply electrical power to the selected circuits. 1.1.3 This standard shall cover installation, maintenance, operation, and testing requirements as they pertain to the performance of the stored emergency power supply system (SEPSS). 1.1.4 Exclusions. 1.1.4.1 This standard shall not cover the following: (1) Application of the SEPSS (2) Distribution wiring (3) Systems having total outputs less than 500 VA or less than 24 V, or systems less than Class 0.033 (4) Unit equipment (5) Nuclear sources, solar systems, and wind stored-energy systems (6) Uninterruptible power systems (UPS) supplied by an emergency power supply system (EPSS) 1.1.4.2 The following shall not be within the scope of this standard: (1) Specific buildings or facilities, or both, requiring an SEPSS (2) Specific loads to be served by the SEPSS (3) Type, class, or level to be assigned to any specific load (See Section 4.1.)

This standard covers performance requirements for stored electrical energy systems providing an alternate source of electrical power in buildings and facilities in the event that the normal electrical power source fails. Systems include power sources, transfer equipment, controls, supervisory equipment, and accessory equipment needed to supply electrical power to the selected circuits.

Official document scope
What does NFPA 111 address?

NFPA 111 presents installation, maintenance, operation, and testing requirements as they pertain to the performance of the stored emergency power supply system (SEPSS) up to the load terminals of the transfer switch. Specific topics include definitions of the classification of SEPSS; energy sources, converters, inverters, and accessories; transfer switches and protection; installation and environmental considerations; and routine maintenance and operational testing.



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