UL 1481
Standard for Power Supplies for Fire-Protective Signaling Systems

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2006-12-12DOD Approved: --
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover commercial stationary and fixed power supplies for fire-protective signaling systems, having input and output ratings of not more than 300 volts, direct- and alternating-current, (DC and AC), for use in indoor locations in accordance with the following Standards of the National Fire Protection Association:

    1.1

    NFPA 70  National Electrical Code

    NFPA 72  National Fire Alarm Code

    1.2 These requirements also cover power supply-battery charger combinations used as power supplies, and battery charger units for use as components in fire-protective signaling systems.

    1.3 These requirements do not cover power supplies or battery chargers integral with control units or amplifiers intended for fire-protective signaling service.

    1.4 These requirements do not cover power supplies for use in hazardous locations, as defined in the National Electrical Code, ANSI/NFPA 70.

    1.5 These requirements do not cover commercial power supplies covered by the Standard for Power Units Other Than Class 2, UL 1012, or commercial battery chargers covered by the Standard for Battery Chargers for Charging Engine-Starter Batteries, UL 1236.

    1.6 A power supply that is not a complete assembly and depends upon installation in an end product for compliance with the requirements of this standard shall be investigated under the requirements of the standard for that end product.

    1.7 The term "product" as used in this standard refers to all power supplies, battery chargers, power supply-battery charger combinations, and battery charger units or any part thereof covered by this standard unless specifically noted otherwise.

    1.8 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this Standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements to determine that the level of safety as originally anticipated by the intent of this Standard is maintained. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this Standard shall not be judged to comply with this Standard. Where appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Undated references
          • 3 Glossary
        • INSTRUCTIONS AND DRAWINGS
          • 4 Details
            • 4.1 General
            • 4.2 Installation drawings
            • 4.3 Operating instructions
        • CONSTRUCTION
          • ASSEMBLY
          • 5 General
          • 6 Enclosures
            • 6.1 General
            • 6.2 Openings
            • 6.3 Cast metal
            • 6.4 Sheet metal
            • 6.5 Nonmetallic
            • 6.6 Doors and covers
            • 6.7 Transparent covers
            • 6.8 Screens and expanded metal
          • 7 Protection of Service Personnel
          • 8 Electric Shock
          • 9 Corrosion Protection
          • FIELD-WIRING CONNECTIONS
          • 10 General
          • 11 Separation of Circuits
          • 12 Field-Wiring Compartment
          • 13 Terminals – General Application
          • 14 Leads
          • 15 Grounding
          • INTERNAL WIRING AND ASSEMBLY
          • 16 General
          • 17 Separation of Circuits
            • 17.1 General
            • 17.2 Barrier
          • 18 Bonding for Grounding
          • COMPONENTS – ELECTRICAL
          • 19 General
            • 19.1 Mounting of components
            • 19.2 Insulating materials
            • 19.3 Current-carrying parts
            • 19.4 Bushings
          • 20 Meters
          • 21 Overcurrent Protection
          • 22 Semiconductors
          • 23 Storage Batteries
          • 24 Switches
          • 25 Transformers, Relays
          • 26 Spacings
        • PERFORMANCE
          • DETAILS
          • 27 General
          • 28 Test Voltages and Currents
          • TESTS – POWER SUPPLIES
          • 29 Input Test – Power Supplies
          • 30 Variable Voltage Operation Test– Power Supplies
            • 30.1 Regulated power supplies
            • 30.2 Specific application power supplies
          • 31 Power-Limited Circuits
            • 31.1 General
            • 31.2 Maximum voltage
            • 31.3 Maximum current
            • 31.4 VA (not inherently limited circuits only)
          • 32 Output Ripple Test
          • TESTS – POWER SUPPLY-BATTERY CHARGERS
          • 33 General
          • 34 Input Test – Power Supplies-Battery Chargers
          • 35 Variable Voltage Operation Test – Power Supplies-Battery Chargers
          • 36 Charging Current Tests
            • 36.1 General
            • 36.2 Battery discharge – initial trial
            • 36.3 Battery recharge
            • 36.4 Battery discharge – second trial
          • TESTS – BATTERY CHARGERS
          • 37 General
          • 38 Input Test – Battery Chargers
          • 39 Variable Voltage Operation Test– Battery Chargers
          • 40 Charging Current Test
          • TESTS – ALL UNITS
          • 41 Variable Ambient Temperature Test
          • 42 Humidity Test
          • 43 Electric Shock Current Test
          • 44 Leakage Current Test
          • 45 Jarring Test
          • 46 Temperature Test
          • 47 Transient Tests
            • 47.1 General
            • 47.2 Supply line transients
            • 47.3 Input/output circuit transients
            • 47.4 Internally induced transients
          • 48 Dielectric Voltage-Withstand Test
          • 49 Overload Test
          • 50 Endurance Test
          • 51 Abnormal Operation Test
            • 51.1 General
            • 51.2 Output short-circuit
            • 51.3 Blocked fan
            • 51.4 Variable autotransformer operation
          • 52 Coil Burnout Tests
            • 52.1 General
            • 52.2 Relays and solenoids
            • 52.3 Transformers
          • 53 Component Malfunction
          • 54 Strain Relief
          • 55 Impact Test for Enclosures
          • 56 Effect of Shipping and Storage Temperatures
        • MANUFACTURING AND PRODUCTION TESTS
          • 57 Production-Line Dielectric Voltage-Withstand Test
        • MARKING
          • 58 General
          • 59 Permanence of Marking
    • APPENDIX A