UL 1917
Standard for Solid-State Fan Speed Controls

DETAILS
Edition Number:4SCC Approved:--
Edition Date:2013-07-03DOD Approved: --
Price Code:BANSI Approved: 2017-10-04
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover solid state speed controls rated 300 volts or less, single phase, intended to be connected to 15 – 20 ampere branch circuits and intended to be installed in accordance with the National Electrical Code, ANSI/NFPA 70 and used with:

    a)    Fans and blowers that circulate air, such as desk, bracket, ceiling, hassock, pedestal, and utility fans;

    b)    Fans and blowers that ventilate air, such as attic, wall-insert, ceiling-insert, household hood- and canopy-types, and window fans;

    c)    Evaporative coolers;

    d)    Air-filtering appliances;

    e)    Fan-type deodorizers; and

    f)    Fan-type air fresheners.

    1.2 Inductive-type and capacitive-type fan speed controls are also covered by these requirements.

    1.3 These requirements also cover the solid state fan speed control portion of controls which include dimmers for use with lighting fixtures.

    1.4 Solid state fan speed controls provided with a power supply cord, those intended for permanent connection, and direct plug-in devices are also covered by this Standard.

    1.5 These requirements do not cover solid state speed controls used with air heaters incorporating fans, heating-ventilating units, or blowers comprising components of such equipment as furnaces, mechanical-refrigeration equipment, air conditioners, or direct current output applications.

    1.6 These requirements do not cover solid state speed controls used with fans intended to be:

    a)    Used in hazardous locations as defined in the National Electrical Code, ANSI/NFPA 70;

    b)    Installed over solvents or chemically flammable liquids or vapors; or

    c)    Located in chemically corrosive environments.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Glossary
          • 3 Components
          • 4 Units of Measurement
          • 5 Undated References
          • 6 General
        • CONSTRUCTION
          • 7 Enclosure
            • 7.1 General
            • 7.2 Cast metal
            • 7.3 Sheet metal
            • 7.4 Polymeric
            • 7.5 Doors and covers
            • 7.6 Application of probes
            • 7.7 Conduit connection
            • 7.8 Bonding
            • 7.9 Adjustment opening
          • 8 Corrosion Protection
            • 8.1 General
            • 8.2 Outdoor enclosures
          • 9 Mounting
            • 9.1 Surface mounted
            • 9.2 Wall box mounted
          • 10 Direct Plug-In Devices
          • 11 Switches
            • 11.1 General
            • 11.2 Dimmers
          • 12 Live Parts
          • 13 Internal Wiring
            • 13.1 General
            • 13.2 Routing of internal wiring
            • 13.3 Clamps and guides
            • 13.4 Insulating bonding and grounding conductors
            • 13.5 Splices and connections
            • 13.6 Splice insulation
          • 14 Supply Connections – Permanently Connected Speed Controls
            • 14.1 General
            • 14.2 Tapped holes for conduit
            • 14.3 Knockouts
            • 14.4 Terminals
            • 14.5 Field wiring space
          • 15 Supply Connections – Cord Connected Speed Controls
            • 15.1 Cords and plugs
            • 15.2 Strain relief
            • 15.3 Bushings
            • 15.4 Receptacles
          • 16 Supply Connections – Direct Plug-In Devices
          • 17 Spacings
            • 17.1 General
            • 17.2 Primary circuit spacings
            • 17.3 Secondary circuit spacings
            • 17.4 Limited energy
            • 17.5 Battery power
            • 17.6 Insulating barriers
          • 18 Separation of Circuits
          • 19 Grounding
        • PERFORMANCE
          • 20 General
          • 21 Temperature Test
          • 22 DC Offset Voltage Test
          • 23 Overload Test
          • 24 Endurance Test
          • 25 Dielectric Voltage-Withstand Test
          • 26 Short Circuit Test
          • 27 Breakdown of Components Test
            • 27.1 General breakdown of components test
            • 27.2 Abnormal switching test
          • 28 Crush Test
          • 29 Compression Test
          • 30 Deflection Test
          • 31 Securement of Snap-On Cover Test
          • 32 Polymeric Enclosure Conduit Connection Tests
            • 32.1 General
            • 32.2 Pullout
            • 32.3 Torque
            • 32.4 Bending
            • 32.5 Knockouts
          • 33 Abuse Test
          • 34 Strain Relief Test
          • 35 Push Back Relief Test
          • 36 Security of Leads Test
          • 37 Terminal Torque Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 38 Dielectric Voltage-Withstand Test
          • 39 DC Offset Voltage Test
        • RATINGS
          • 40 General
        • MARKINGS
          • 41 General Markings
          • 42 Cautionary and Warning Markings
        • INSTRUCTIONS
          • 43 Details
    • Appendix A