UL 985
Standard for Household Fire Warning System Units

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2015-05-15DOD Approved: --
Price Code:BANSI Approved: 2018-07-12
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover household fire warning system control units intended to be installed in accordance with the National Fire Alarm Code, ANSI/NFPA 72, and the National Electrical Code, ANSI/NFPA 70.

    1.2 A household fire warning system control unit consists of a unit assembly of electrical parts having provision for connection of power supply and initiating device circuits. Provision for connection of a notification appliance circuit is also required unless an alarm sounding device is integral with the control unit. Additional terminals may be provided for the connection of supplementary devices, such as annunciators, remote switches, and the like. A secondary supply, consisting of a rechargeable battery, shall be provided integral with the control unit or provision may be provided for its connection to the control unit.

    1.3 Provision for the connection to the control unit of at least one smoke detector is required unless reference is made on the installation diagram for the use of a self-contained smoke detector, such as a single- or multiple-station fire alarm device.

    1.4 These requirements also apply to the use of combination systems, such as a combination fire-burglar alarm system control unit, which uses circuit wiring common to both systems. When common wiring is used for combination systems, it shall be connected in such a manner that internal fault conditions (shorts, opens, grounds) in the nonfire alarm (burglary) system circuit wiring, or faults between the fire and nonfire alarm system circuits, will not interfere with the supervision of the fire alarm system or prevent intended alarm signal transmission.

    1.5 These requirements do not cover single- or multiple-station fire alarm devices, automatic fire detectors, or alarm notification appliances, such as bells, horns, carbon monoxide alarm devices, emergency initiating devices, non-emergency initiating devices, and the like. They do cover accessories which are external to the control unit and are dependent upon the control unit function, such as end-of-line devices, annunciators, and remote switches.

    1.6 If a digital alarm communicator transmitter is used to transmit signals to a remote location and it is to be included as a component of the system, it shall comply with the applicable requirements in the Standard for Digital Alarm Communicator System Units, UL 1635. Otherwise the user must be notified that the off-premises transmission method has not been so investigated.

    1.7 Where a unit employs security functions, it shall comply with the Standard for Household Burglar-Alarm System Units, UL 1023. Units employing medical alert functions shall comply with the Standard for Home-Health Care Signaling Equipment, UL 1637. A unit utilizing non-fire and/or non-carbon monoxide emergency and/or non-emergency signaling functions shall meet the requirements of the Standard for General-Purpose Signaling Devices and Systems, UL 2017.

  • 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
          • 4 Instructions and Drawings
          • 5 Compatibility Information
            • 5.1 General
            • 5.2 Method of evaluation
            • 5.3 Changes affecting compatibility
        • CONSTRUCTION
          • 6 General
          • 7 Frame and Enclosure
            • 7.1 General
            • 7.2 Cast metal enclosures
            • 7.3 Sheet metal enclosures
            • 7.4 Nonmetallic enclosures
          • 8 Electric Shock
          • 9 Enclosure Openings
            • 9.1 General
            • 9.2 Enclosure top openings
            • 9.3 Enclosure side openings
            • 9.4 Enclosure bottom openings
          • 10 Metal Covers and Doors
          • 11 Glass Panels
          • 12 Corrosion Protection
          • 13 Insulating Material
          • 14 Mounting of Electrical Components
          • 15 Operating Mechanisms
          • 16 Current-Carrying Parts
          • 17 Grounding for Products Containing High-Voltage Circuits
          • 18 Servicing Protection
        • FIELD-WIRING CONNECTIONS
          • 19 Power Connections
          • 20 Primary Power Supply
          • 21 Secondary Power Supply
          • 22 Batteries
        • INSTALLATION WIRING CONNECTIONS
          • 23 General
          • 24 Field-Wiring Terminals
          • 25 Field-Wiring Leads
          • 26 Power-Supply Cord
          • 27 Strain Relief
          • 28 Power-Limited Circuits
        • INTERNAL WIRING AND ASSEMBLY
          • 29 Internal Wiring
        • GROUNDING
          • 30 Equipment Grounding
          • 31 Polarity Identification
        • COMPONENTS
          • 32 End-of-Line Devices
          • 33 Printed Wiring Boards
          • 34 Bushings
          • 35 Coil Windings
          • 36 Switches
          • 37 Lampholders and Lamps
          • 38 Protective Devices
        • SPACINGS
          • 39 General
        • PERFORMANCE
          • 40 General
          • 41 Normal Operation Test
            • 41.1 Fire alarm control unit
            • 41.2 Supervising stations
            • 41.3 Combination control unit
            • 41.4 Primary power supply
          • 42 Alarm Verification Feature (Optional)
          • 43 Two-Wire Smoke Detector Compatibility Tests
            • 43.1 Operating voltage determination
            • 43.2 Alarm threshold impedance
            • 43.3 Maximum current limitation
            • 43.4 Multiple detector alarm capacity
            • 43.5 Detectors with optional components
            • 43.6 Dynamic load immunity
            • 43.7 Electrical supervision
            • 43.8 Maximum capacitance loading
            • 43.9 Alarm reset voltage and time
            • 43.10 Alarm verification (optional)
            • 43.11 Minimum normal standby impedance (optional)
            • 43.12 Minimum impedance where second alarm will not occur (optional)
          • 44 Electrical Supervision Test
            • 44.1 Power supplies
            • 44.2 Interconnecting circuits and pathways
            • 44.3 Trouble signals
            • 44.4 Keypads
          • 45 Undervoltage Operation Test
          • 46 Overvoltage Operation Test
          • 47 Voltage and Current Measurements
            • 47.1 Input circuit
            • 47.2 Output circuit
          • 48 Power-Limited Circuits
            • 48.1 General
            • 48.2 Maximum voltage
            • 48.3 Maximum current
            • 48.4 VA (not inherently limited circuits only)
          • 49 Jarring Test
          • 50 Component Temperature Test
          • 51 Charging Current Test
            • 51.1 General
            • 51.2 Discharged battery
            • 51.3 Charged battery
            • 51.4 Discharged battery – second trial
          • 52 Overload Test
            • 52.1 Control unit
            • 52.2 Separately energized circuits
          • 53 Endurance Test
            • 53.1 Control unit
            • 53.2 Operating device
          • 54 Variable Ambient Temperature Test
          • 55 Humidity Test
          • 56 Leakage Current Test
          • 57 Electric Shock Current Test
          • 58 Transient Test
            • 58.1 General
            • 58.2 Supply line ring wave surge voltage transients
            • 58.3 Internally induced transients
            • 58.4 Input/output circuit (low-voltage circuit) transients
          • 59 Dielectric Voltage-Withstand Test
          • 60 Component Failure Test
          • 61 Audibility Test
          • 62 Abnormal Operation Test
        • SHORT RANGE RADIO FREQUENCY DEVICES
          • 63 General
          • 64 Operation
            • 64.1 General
            • 64.2 Signaling
            • 64.3 Sprinkler supervisory signals
            • 64.4 Maximum duration of transmission
            • 64.5 Inoperative transmitter reporting
            • 64.6 Tamper signal
            • 64.7 Interference protection
            • 64.8 Battery status indication
          • 65 Reference Level Determination
          • 66 Interference Immunity
          • 67 Frequency Selectivity
          • 68 Time to Report Alarm
          • 69 Clash
          • 70 Error (Falsing) Rate
          • 71 Throughput Rate
          • 72 Maximum Duration of Transmission
          • 73 Transmitter Stability Tests
          • 74 Transmitter Accelerated Aging Test
          • 75 Installation Instructions and User Manual
          • 76 Primary Batteries Test
            • 76.1 Life test
            • 76.2 Battery trouble voltage determination
            • 76.3 Battery replacement test
            • 76.4 Butt-type connection pressure test
            • 76.5 Polarity reversal test
        • MANUFACTURING AND PRODUCTION TESTS
          • 77 Production-Line Dielectric Voltage-Withstand Test
          • 78 Production-Line Grounding-Continuity Test for High-Voltage, Cord-Connected Products
        • INSTALLATION DRAWING
          • 79 General
        • INSTRUCTIONS
          • 80 General
        • MARKINGS
          • 81 General
    • APPENDIX A
    • APPENDIX SBINSTRUCTIONS FOR CALCULATING ATTENUATION PARAMETERS AND OPEN AREA TEST DISTANCE (D)