NFPA 111-2001 Standard on Stored Electrical Energy Emergency and Standby Power Systems.
2.1.6 Energy Conversion Equipment (ECE). A system of either a UPS, a battery bank and battery charger (central battery sys- tem), or a rotating motor generator (with or without inertia fly- wheel), often supplied by a central battery system power source. 2.1.7 Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark of an orga- nization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains peri- odic inspection of production of labeled equipment or mate- rials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. 2.1.8* Listed. Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of pro- duction of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose. 2.1.9 Nonautomatic Transfer Switch. A device, operated by direct manpower or electrical remote manual control, for transferring one or more load conductor connections from one power source to another. 2.1.10 Shall. Indicates a mandatory requirement. 2.1.11 Should. Indicates a recommendation or that which is advised but not required.
2.2.5 Level. It is recognized that an SEPSS is utilized in many different locations and for many different purposes. The requirement for one application might not be appropriate for other applications. Therefore, this standard recognizes two lev- els of equipment installation, performance, and maintenance.* Level 1 defines the most stringent equipment perfor- mance requirements for applications where failure of the equip- ment to perform could result in loss of human life or serious injuries. All Level 1 equipment shall be permanently installed.* Level 2 defines equipment performance require- ments for applications where failure of the SEPSS to perform is less critical to human life and safety and where it is expected that the authority having jurisdiction will exercise its option to permit a higher degree of flexibility than provided by Level 1. All Level 2 equipment shall be permanently installed.* It is the intent of Levels 1 and 2 to ensure that loads provided with an SEPSS are supplied with alternate power of a quality that is satisfactory to ensure adequate operation or is acceptable for the load, within the time defined in the type and for a duration defined in the class.NFPA 111 pdf download.