UL 1411
Standard for Transformers and Motor Transformers for Use in Audio-, Radio-, and Television-Type Appliances

DETAILS
Edition Number:7SCC Approved:--
Edition Date:2016-01-15DOD Approved: --
Price Code:BANSI Approved: 2015-08-31
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements apply to transformers, autotransformers, and motor-transformers intended to be used in audio-, radio-, and television-type appliances in which the primary winding is connected across the supply circuit.

    1.2 The requirements in Sections 6 – 17, 25 – 28, 30, and 31 also apply to transformers intended for use in high-frequency, switching-type power supplies in which the transformer provides isolation from the supply circuit.

    1.3 These requirements do not apply to transformers that are intended to transform only audio, video, and other signal waveforms. Those transformers are covered by the Standard for Isolating Signal and Feedback Transformers for Use in Electronic Equipment, UL 1876.

    1.4 These requirements apply to a transformer or motor transformer that includes a separate current-limiting impedance such as a positive temperature coefficient (PTC) device complying with the requirements for thermistor-type devices, or a resistor complying with the Standard for Fusing Resistors and Temperature-Limited Resistors for Radio- and Television-Type Appliances, UL 1412.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 Enclosure
          • 7 Leads
            • 7.1 Insulation
            • 7.2 Cords
            • 7.3 Sleeving, tape, and tubing
            • 7.4 Connections between leads
            • 7.5 Strain relief
            • 7.6 Openings for wires
            • 7.7 Bushings
          • 8 Interconnection of Windings
          • 9 Protective Devices
          • 10 Separate Current-Limiting Material
          • 11 Live Part Insulating Material
          • 12 Bobbin Material
          • 13 Coil Insulation
          • 14 Outer-Wrap and Crossover-Lead Insulation
          • 15 Equivalent Generic Materials
          • 16 Spacings
          • 17 Double Protection
          • 18 Transformers for Use with Hospital-Appliance Pendant Controls
        • PERFORMANCE
          • 19 General
          • 20 Power Input Test
          • 21 Temperature Test
          • 22 Open-Circuit Voltage Test
          • 23 Power Output Test
          • 24 Stalled Rotor Test
          • 25 Dielectric Voltage-Withstand Test
            • 25.1 General
            • 25.2 Insulation comparison
            • 25.3 Induced potential
            • 25.4 Production-line dielectric potential suitability test
          • 26 Thermoplastic Bobbin Temperature Stability Test
          • 27 Strain Relief Test
          • 28 Insulation Resistance Test
          • 29 Abnormal Operation Tests
            • 29.1 General
            • 29.2 7-hour abnormal operation test
            • 29.3 15-day abnormal operation test
        • MANUFACTURING AND PRODUCTION TEST
          • 30 Dielectric Voltage-Withstand Test
        • MARKINGS
          • 31 Details
    • APPENDIX A