UL 924-2020 pdf free download.Emergency Lighting and Power Equipment.
4 Glossary
4.1 For the purpose of this standard the folIowng definitions apply.
4.2 AUTOMATIC BATTERY CHARGING EQUIPMENT — Equipment provided to maintain the central storage battery bank in a charged condition at all times when the normal supply is available.
4.3 AUTOMATIC LOAD CONTROL RELAY — An Emergency Lighting Control Device (ELCD) intended to energize, to appropriate power or illumination levels, switched or normally off emergency equipment from an emergency supply in the event of failure of the normal supply. and to de-energize or return the equipment to normal status when the normal supply is restored. These devices are not transfer switches, but instead transmit power only from a single upstream source (typically, the emergency source) to specific loads. They connect to a second (typically, the normal) source of power only for monitoring purposes.
4.4 AUXILIARY LIGHTING AND POWER EQUIPMENT — Equipment associated with or related to, but not interconnected with or required as part of a facilitys emergency lighting or power system. This equipment is not evaluated for compliance with the minimum output (power or light) requirements of the National Electrical Code, ANSI/N FPA 70, the Life Safety Code, NFPA 101, or the International Building Code, and is so marked.
4.5 BATTERY BANK — An enclosed group of batteries intended to supply power to remote lighting or power equipment.
4.6 CENTRAL STATION BATTERY LIGHTING AND POWER SYSTEMS — Systems intended to supply power for emergency lighting equipment, typically consisting of a central storage battery bank, automatic battery charging equipment. inverters. automatic control relays, multi-circuit distribution equipment, derangement alarm equipment, and other applicable accessories. Such equipment may be integrally housed in a single overall enclosure or may be separately enclosed for remote connection to a central control unit.
4.7 CENTRAL STORAGE BATTERY BANK — Storage batteries arranged and connected so as to provide the required emergency system voltage.
4.8 CLASS 2 CIRCUIT — A circuit supplied by an isolating source that complies with the Standard for
Class 2 Power Units, UL 1310 or the Class 2 requirements of either the Standard for Low Voltage
Transformers — Part 1: General Requirements, UL 5085-1 and the Standard for Low Voltage Transformers
— Part 3: Class 2 and Class 3 Transformers, UL 5085-3. or the Limited Power Source Test of the Standard
for Household and Commercial Batteries, UL 2054.
4.9 COMBINATION UNIT — A single piece of equipment that functions as an Exit Light and as Unit Equipment.
4.10 COMBUSTION — The decomposition of materials from solid to vapor state, through the application of heat, typically evidenced by flames, smoldering, charring, or mechanical deformation.UL 924 pdf download.