UL 924
Standard for Emergency Lighting and Power Equipment

DETAILS
Edition Number:10SCC Approved:--
Edition Date:2016-05-09DOD Approved: 1982-11-14
Price Code:DANSI Approved: 2017-03-08
Type:ulstd

  • SCOPE

    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. 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

    Automatic Load Control Relays

    Derangement Signal Equipment

    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

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 References
          • 3 Resistance to Environmental Conditions
          • 4 Glossary
          • 5 Components
          • 6 Units of Measurement
          • 7 Radioactive Energy Sources
        • CONSTRUCTION
          • 8 Frame and Enclosure
            • 8.1 General
            • 8.2 Uninsulated live parts
            • 8.3 Metallic enclosures
            • 8.4 Nonmetallic enclosures
            • 8.5 Enclosure openings
            • 8.6 Enclosure covers
          • 9 Environmental Rating
          • 10 Polymeric Materials
            • 10.1 General
            • 10.2 Enclosures
            • 10.3 Mechanical support
            • 10.4 Barriers
            • 10.5 Grounding or bonding means
            • 10.6 Structural support
          • 11 Mounting Means
          • 12 Corrosion Resistance
          • 13 Insulation Material
          • 14 Mounting of Parts
          • 15 Operating Mechanisms
          • 16 Current-Carrying Parts
          • 17 Installation – Wiring Connections
            • 17.1 General
            • 17.2 Terminals
            • 17.3 Field-wiring leads
            • 17.4 Polarity identification
            • 17.5 Termination of wiring systems
            • 17.6 Knockouts
          • 18 Cord-Connected Unit Equipment and Luminaires
            • 18.1 General
            • 18.2 Flexible cord
            • 18.3 Alternative connection
            • 18.4 Attachment plug
            • 18.5 Grounding
            • 18.6 Strain relief
            • 18.7 Push-in prevention
            • 18.8 Bushings
          • 19 Internal Wiring
            • 19.1 Wires
            • 19.2 Wireways
            • 19.3 Electrical connections
            • 19.4 Separation of circuits
            • 19.5 Conductor secureness
          • 20 Grounding
          • 21 Bonding of Internal Parts
          • 22 Batteries
          • 23 Electronic Circuits
          • 24 Capacitors
          • 25 Lampholders
          • 26 Overcurrent (Overload) Protection
          • 27 Coil Windings
          • 28 Derangement Signals
          • 29 Test Switch
          • 30 Self-Testing/Self-Diagnostic Equipment
          • 31 Disconnect Switches and Fuses
          • 32 Transformers
          • 33 Impedance Networks
          • 34 Printed-Wiring Board
          • 35 Motors
          • 36 Equipment Using Simple Reactance Ballasts and Lamps Having Integral Starters
          • 37 Spacings
            • 37.1 General
            • 37.2 Barriers
            • 37.3 Insulating barriers
          • 38 Field-Wiring Space
            • 38.1 General
            • 38.2 Wire-bending space
          • 39 Accessibility of Insulated Current-Carrying Parts
            • 39.1 General
            • 39.2 Accessibility determination
            • 39.3 Insulated parts
            • 39.4 Accessibility barriers
        • EXIT SIGN VISIBILITY
          • 40 Exit Sign Contruction – General
          • 41 Text-Based Exit Signs – Construction
          • 42 Graphical Symbol Exit Signs – Construction
          • 43 Performance
            • 43.1 General
            • 43.2 Observation visibility test
            • 43.3 Luminance measurement test
            • 43.4 Non-energized contrast measurement test
            • 43.5 Flashing rate, light pulse duration, and duration between successive light pulse measurements
          • 44 Markings
        • PERFORMANCE
          • 45 General
          • 46 Leakage Current Test
          • 47 Normal Operation Test
          • 48 Battery Discharge Test
          • 49 Input Test
          • 50 Determination of Low-Voltage, Limited-Energy Circuit Status
          • 51 Determination of Limiting Impedance Circuit Status
          • 52 Temperature Test
          • 53 Overvoltage Withstand Test
          • 54 Undervoltage Recharge Capability Test
          • 55 Voltage Surge Test
          • 56 Dielectric Voltage-Withstand Test
          • 57 Conformal Coating Test Program I
            • 57.1 General
            • 57.2 Coating on printed-wiring board in lieu of spacings
          • 58 Conformal Coating Test Program II
            • 58.1 General
            • 58.2 Samples
            • 58.3 Room ambient conditioning
            • 58.4 Thermal conditioning
            • 58.5 Dielectric voltage-withstand test for conformal coating
          • 59 Strain Relief Test
            • 59.1 General
            • 59.2 Strain
          • 60 Conductor Secureness Test
          • 61 Overtinned Wire Flexibility Test
          • 62 Bonding Conductor Test
          • 63 Grounding Continuity Test
          • 64 Security of Knockout Test
          • 65 Swivel Torsion and Pull Test
          • 66 Component Breakdown Test
            • 66.1 General
            • 66.2 General test conditions
          • 67 Humidity Conditioning Test
          • 68 Impact Test
          • 69 Mechanical Support Static Load Test
          • 70 Barrier Strength Test
        • RATINGS
          • 71 General
          • 72 Standby Operation
        • MARKINGS
          • 73 General
            • 73.1 Details
            • 73.2 Fuse replacement
        • INSTRUCTION MANUAL
          • 74 General
          • 75 Safety Instructions
          • 76 Other Instructions
        • LOW-FREQUENCY INVERTERS
          • 77 General
          • 78 Performance
            • 78.1 Output load power factor test
            • 78.2 Battery discharge test
            • 78.3 Output voltage and frequency test
        • HIGH-FREQUENCY INVERTERS
          • 79 General
          • 80 Performance
            • 80.1 General
            • 80.2 Output voltage and current test
            • 80.3 Abnormal conditions test
          • 81 Marking
    • MINIMUM LIGHT OUTPUT FOR EMERGENCY LIGHTING EQUIPMENT
    • APPENDIX A