NFPA 110-2019 Standard for Emergency and Standby Power Systems.
Chapter 3 Definitions 3.1 General. The definitions contained in this chapter shall apply to the terms used in this standard. Where terms are not defined in this chapter or within another chapter, they shall be defined using their ordinarily accepted meanings within the context in which they are used. Merriam-Webster’s Collegiate Dictionary, 11th edition, shall be the source for the ordinarily accepted meaning. 3.2 NFPA Official Definitions. 3.2.1* Approved. Acceptable to the authority having jurisdic- tion. . 3.2.2* Authority Having Jurisdiction (AHJ). An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure. 3.2.3 Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organ- ization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains peri- odic inspection of production of labeled equipment or materi- als，and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. 3.2.4* 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 production of listed equipment or materials or periodic evalua- tion of services, and whose listing states that either the equip- ment，material, or service meets appropriate designated standards or has been tested and found suitable for a specifed purpose. 3.2.5 Shall. Indicates a mandatory requirement.
3.3.4* Emergency Power Supply System (EPSS). A complete functioning EPS system coupled to a system of conductors, disconnecting means and overcurrent protective devices, trans- fer switches, and all control, supervisory, and support devices up to and including the load terminals of the transfer equip- ment needed for the system to operate as a safe and reliable source of electric power. N 3.3.5 Field Evaluation Body (FEB). An organization, or part of an organization, that performs field evaluations of electrical or other equipment. [790, 2018] N 3.3.6 Field Labeled (as applied to evaluated products). Equip- ment or materials to which has been attached a label, symbol, or other identifying mark of an FEB indicating the equipment or materials were evaluated and found to comply with require- ments as described in an accompanying field evaluation report. [70:100] 3.3.7 Fuel Tank. 3.3.7.1 Day Fuel Tank. A fuel tank, located inside a struc- ture, that provides fuel to the engine. 3.3.7.2 Enclosed Fuel Tank. A fuel tank located within a separate room, separated from other equipment. 3.3.7.3 Integral Fuel Tank in EPS Systems. A fuel tank furnished by the EPS supplier and mounted on the engine or under as a subbase. 3.3.7.4 Main Fuel Tank. A separate, main fuel tank for supplying fuel to the engine or a day tank.NFPA 110 pdf download.