UL 979
Standard for Water Treatment Appliances

DETAILS
Edition Number:2SCC Approved:--
Edition Date:2016-09-29DOD Approved: --
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover electrically operated water treatment appliances for household and commercial use. These appliances are intended for installation and use in accordance with the National Electrical Code, NFPA 70, and are rated 600 V or less.

    1.2 These requirements cover appliances utilizing features that treat water through the use of cation exchange water softeners, ionization, filters, ultraviolet radiation, ozone generation, and reverse osmosis.

    1.3 These requirements do not cover water treatment appliances for use with pools or spas, water distillers, aquariums, or other equipment connected to plumbing that is covered by individual requirements.

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

    1.5 These requirements do not cover the aesthetic effects or the effectiveness of water treatment.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Glossary
          • 3 Safety Critical Functions
          • 4 Units of Measurement
          • 5 Undated References
        • CONSTRUCTION
          • 6 Components
            • 6.1 General
            • 6.2 Attachment plugs, receptacles, connectors, and terminals
            • 6.3 Batteries and battery chargers
            • 6.3A Button or coin cell batteries of lithium technologies
            • 6.4 Boxes and raceways
            • 6.5 Capacitors and filters
            • 6.6 Controls
            • 6.7 Cords, cables, and internal wiring
            • 6.8 Cooling fan
            • 6.9 Film-coated wire (magnet wire)
            • 6.10 Gaskets and seals
            • 6.11 Ground-fault, arc-fault, and leakage current detectors/interrupters
            • 6.12 Heaters and heating elements
            • 6.13 Insulation systems
            • 6.14 Light sources and associated components
            • 6.15 Marking and labeling systems
            • 6.16 Motors and motor overload protection
            • 6.17 Overcurrent protection
            • 6.18 Polymeric materials
            • 6.19 Power supplies
            • 6.20 Printed wiring boards
            • 6.21 Semiconductors and small electrical and electronic components
            • 6.22 Supplemental insulation, insulating bushings, and assembly aids
            • 6.23 Switches
            • 6.24 Transformers
            • 6.25 Valves (electrically operated) and solenoids
            • 6.26 Water pumps
            • 6.27 Power-switching semiconductors (mounted to accessible metal parts)
            • 6.28 Thermistors
          • 7 General
          • 8 Frame and Enclosure
          • 8A Button or Coin Cell Batteries of Lithium Technologies
          • 9 Accessibility of Uninsulated Live Parts, Film-Coated Wire, and Moving Parts
          • 10 Protection Against Corrosion
          • 11 Exposure to Water
          • 12 Mechanical Assembly
          • 13 Supply Connections – Cord Connected Appliances
            • 13.1 General
            • 13.2 Strain relief
            • 13.3 Bushings
          • 14 Supply Connections – Permanently-Connected Appliances
            • 14.1 General
            • 14.2 Terminal compartment
            • 14.3 Wiring terminals and leads
            • 14.4 Identified terminals and leads
          • 15 Grounding
            • 15.1 General
            • 15.2 Identification
          • 16 Live Parts
          • 17 Electrical Insulation
          • 18 Internal and External Wiring and Connections
          • 19 Tabs Used in Electrical Quick-Connect Terminals
            • 19.1 General
            • 19.2 Material requirements
            • 19.3 Dimensional requirements
          • 20 Separation of Circuits
            • 20.1 Separation between different internal wiring circuits (factory-installed conductors)
            • 20.2 Separation between different field wiring circuits (field-installed conductors)
            • 20.3 Separation between field wiring circuits (field-installed conductors) and internal wiring circuits (factory-installed conductors)
            • 20.4 Segregation methods
            • 20.5 Separation methods
          • 21 Spacings
            • 21.1 General
            • 21.2 Low-voltage and isolated limited-energy circuits
            • 21.3 High-voltage circuits
          • 22 Spacings On Printed Wiring Boards
          • 23 Capacitors
          • 24 Lampholders
          • 25 Parts Subject to Pressure
          • 25A Parts Subject to Pressure
            • 25A.1 General
            • 25A.2 Parts subject to air or vapor pressure
            • 25A.3 Parts subject to municipal water pressure
            • 25A.4 Parts subject to pump pressure
          • 26 Pressure-Relief Devices
          • 27 Switches and Controls
          • 28 Controls – End Product Test Parameters
            • 28.1 General
            • 28.2 Auxiliary controls
            • 28.3 Operating controls (regulating controls)
            • 28.4 Protective controls (limiting controls)
          • 29 Electronic Circuits Evaluated to UL 60335-1 Based Requirements
            • 29.1 Identification of Safety Critical Circuit Functions
            • 29.2 Protective electronic circuits
            • 29.3 Operating circuits that mitigate a dangerous malfunction of the appliance
            • 29.4 Evaluation of the different types of electronic circuits
            • 29.5 Circuits that provide Safety Critical Functions
          • 30 Transformers and Power Supplies
          • 31 Switch Mode Power Supplies
            • 31.1 Bridging components – switch mode power supplies
            • 31.2 Transformer insulation system
          • 32 Seals, Gaskets, and Diaphragms
          • 33 Motors
            • 33.1 Construction
            • 33.2 Brush wear out
            • 33.3 Overload protection
          • 34 Arc-Fault and Leakage Current Detectors / Interrupters
          • 35 Adhesives Used to Secure Parts
          • 36 Double Insulation
        • PERFORMANCE
          • 37 General
          • 38 Power Input Test
          • 39 Leakage Current Test
          • 40 Leakage Current Following Humidity Conditioning Test
          • 41 Resistance of Grounding Test
          • 42 Temperature Test
          • 43 Burnout Test
          • 44 Dielectric Voltage-Withstand Test
            • 44.1 General
            • 44.2 Induced potential test
          • 45 Abnormal Operation Tests
            • 45.1 General
            • 45.2 Component breakdown test
            • 45.3 No water test
            • 45.4 Ventilation fan test
            • 45.5 Switch mode power supplies
          • 46 Tests for Circuits Evaluated to UL 60335-1 Based Requirements
            • 46.1 General conditions for the tests
            • 46.2 General conditions for the tests
            • 46.3 Test results determined by overcurrent protection operation
            • 46.4 Low-Power Circuits
            • 46.5 Abnormal operation and fault tests
            • 46.6 Programmable component reduced supply voltage test
            • 46.7 Electromagnetic Compatibility (EMC) requirements - immunity
          • 47 Rain Test
          • 48 Ozone Test
          • 49 Reservoir Overflow Test
          • 50 Cleaning Test
          • 51 Strain-Relief Test
          • 52 Push-Back Relief Test
          • 53 Output or Interconnecting Cable Strain-Relief Test
          • 54 Hydrostatic Strength Test
          • 55 Metallic Coating Thickness Test
          • 56 Ultraviolet Irradiance Test
          • 57 Switch and Control Overload Test
          • 58 Operational Test
          • 59 Radiation Test
          • 60 Electrolytic Capacitor Test
          • 61 Printed-Wiring Board Shorted-Trace Test
          • 62 Tempered Glass Impact Test
          • 63 Leakage-Current Water Test
          • 64 Submersion Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 65 Production Line Dielectric Voltage-Withstand Test
          • 66 Production-Line Grounding-Continuity Test
        • RATING
          • 67 Details
        • MARKING
          • 68 Details
        • INSTALLATION INSTRUCTIONS
          • 69 Details