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Official Definitions
Chapter 3 of NFPA 110 contains Official Definitions (3.2) for the terms used in the standard. These include:
Approved - Acceptable to the authority having jurisdiction.
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.
Labeled - Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.
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 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.
Shall - Indicates a mandatory requirement.
Should - Indicates a recommendation or that which is advised but not required.
Standard - A document, the main text of which contains only mandatory provisions using the word “shall” to indicate requirements and which is in a form generally suitable for mandatory reference by another standard or code or for adoption into law. Nonmandatory provisions are not to be considered a part of the requirements of a standard and shall be located in an appendix, annex, footnote, informational note, or other means as permitted in the Manual of Style for NFPA Technical Committee Documents.
General Definitions
The General Definitions (3.3) are technical terms that are considered crucial to the proper understanding of NFPA 110. While these definitions can be used or defined differently in another standard, these definitions apply only to NFPA 110.
Battery Certification - The certification by a battery manufacturer that a battery is built to industry standards.
Black Start - Where the stored energy system has the capability to start the prime mover without using energy from another source.
Emergency Power Supply (EPS) - The source of electric power of the required capacity and quality for an emergency power supply system (EPSS).
Emergency Power Supply System (EPSS) - A complete functioning EPS system coupled to a system of conductors, disconnecting means and overcurrent protective devices, transfer switches, and all control, supervisory, and support devices up to and including the load terminals of the transfer equipment needed for the system to operate as a safe and reliable source of electric power.
Fuel Tank
- Day Fuel Tank - A fuel tank, located inside a structure, that provides fuel to the engine.
- Enclosed Fuel Tank - A fuel tank located within a separate room, separated from other equipment.
- Integral Fuel Tank in EPS Systems - A fuel tank furnished by the EPS supplier and mounted on the engine or under as a subbase.
- Main Fuel Tank - A separate, main fuel tank for supplying fuel to the engine or a day tank.
Lamp - An illuminating indicator.
Lead-Acid Battery
- Valve-Regulated (VRLA) - A lead-acid battery consisting of sealed cells furnished with a valve that opens to vent the battery whenever the internal pressure of the battery exceeds the ambient pressure by a set amount. [1:2015]
- Vented (Flooded) - A lead-acid battery consisting of cells that have electrodes immersed in liquid electrolyte.
Occupancy Category - See ASCE/SEI 7, Minimum Design Loads for Buildings and Other Structures.
Qualified Person - One who has skills and knowledge related to the operation, maintenance, repair, and testing of the EPSS equipment and installations and has received safety training to recognize and avoid the hazards involved.
Switch
- Automatic Transfer Switch (ATS) - Self-acting equipment for transferring the connected load from one power source to another power source.
- Bypass-Isolation Switch - A manually operated device used in conjunction with an automatic transfer switch to provide a means of directly connecting load conductors to a power source and disconnecting the automatic transfer switch.
- Nonautomatic Transfer Switch - A device, operated manually by a physical action or electrically by either a local or remote control, for transferring a common load between a normal and alternate supply.
