UL 924 PDF

1 Scope

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. This Standard also applies to photoluminescent and self-luminous exit signs that do not connect to a branch circuit. 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 include:

1. Exit Signs

2. Emergency Luminaires

3. Unit Equipment

4. Central Station Battery Banks

5. Inverters

6. Automatic Battery Charging and Control Equipment

7. 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 The basic requirements for protection against risk of fire, electric shock, and injury for some equipment within the scope of this standard are addressed in other standards. The primary role of UL 924 in these cases is to validate compliance with emergency system functionality and performance expectations. The investigation of such equipment for UL 924 compliance shall, to the extent practical, adhere to 1 and 2 (typically applied to Components). Examples of equipment and their respective safety standards that exhibit this relationship include, but are not limited to, the following:

1. Luminaires, UL 1598

2. Low Voltage Lighting Systems, UL 2108

3. Electric Signs, UL 48

4. Uninterruptible Power Systems, UL 1778

5. Energy Storage Systems and Equipment, UL 9540

6. Branch Circuit Emergency Lighting Transfer Switches, UL 1008

7. (PoE) Power Source Equipment, UL 60950-1 or UL 62368-1

1.5 Emergency lighting and power equipment intended for installation in Classified (hazardous) Locations, as defined in NFPA 70, shall comply with additional or alternative requirement outside the scope of this standard.

Summary of Topics

This revision of ANSI/UL 924 dated February 12, 2025 includes the following changes:

– Scope updates; 1.1

– Direct current output; 74.1A and 76.7

– Additional battery options; 22.2.1

– ELCF Test; 47.5

– Battery discharge test; 48.1, 48.3, 48.3A, and 48.6

– Temperature test; 52.11.1

– Emergency equipment with AC and DC input ratings; 73A.2.1

– Emergency battery pack replacement marking; 73A.4.15

– Instructions for directly controlled emergency luminaires; 74.11, 74.12, and B1

– Editorial updates; 11.1, 22.2.1, 22.2.2, and 48B.1

– Area of Refuge Signs; Supplement SH

– Functional Safety Evaluations; 23.1, 23.3, and Appendix A