UL 924:2020 pdf download.STANDARD FOR SAFETY-Emergency Lighting and Power Equipment.
1.1 This Standard applies to emergency lighting and power equipment for use in unclassified locations and intended for connection to branch circuits of 600 volts or less. Such equipment is intended to automatically supply illumination or power or both to critical areas and equipment in the event of failure of the normal supply, in accordance with Article 700 or 701 of the National Electrical Code, NFPA 70, the Life Safety Code, NFPA 101, the Fire Code, NFPA 1, the International Building Code, IBC, and the International Fire Code, IFC.
1.2 Examples of equipment described in 1.1 include:
Exit Signs
Emergency Luminaires
Unit Equipment
Central Station Battery Banks
Inverters
Automatic Battery Charging and Control Equipment
Emergency Lighting Control Devices (e.g., Automatic Load Control Relays, Derangement Signals)
1.3 This Standard also applies to auxiliary lighting and power equipment for use in unclassified locations.
Auxiliary equipment has not been investigated to determine compliance with the performance
requirements of Article 700 or 701 of the National Electrical Code, NFPA 70, the Life Safety Code, NFPA
101, or the International Building Code. Such equipment includes luminaires with an integral battery
backup power supply, illuminated directional signs, battery assemblies, and related devices.
1.4 This Standard does not include requirements for equipment covered by other Standards, such as:
Luminaires, UL 1598
Uninterruptible Power Systems, UL 1778
Luminous Egress Path Marking Systems, UL 1994
Transfer Switch Equipment, UL 1008
Electric Signs, UL 48 2 References
2.1 Any undated reference to a code or a standard appearing in the requirements in this standard shall be interpreted as referring to the latest edition of that code or standard.
3 Resistance to Environmental Conditions
3.1 Equipment marked with an enclosure type number, such as 4X, shall comply with the following:
a) The enclosure shaU comply with the applicable requirements specified in the Standard for Enclosures for Electrical Equipment, UL 50, and
b) The equipment shall comply with the requirements in this standard for use in the environment indicated by the enclosure type designation.
4 Glossary
4.1 For the purpose of this standard the following 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 facility’s 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/NFPA 70, the Life Safety Code, NFPA 101, or the International Building Code, and is so marked.UL 924 pdf download.