UL 1876
Standard for Isolating Signal and Feedback Transformers for Use in Electronic Equipment

DETAILS
Edition Number:4SCC Approved:--
Edition Date:2015-06-25DOD Approved: --
Price Code:BANSI Approved: 2015-09-14
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements apply to isolating signal and feedback transformers intended to be used in electronic equipment where only audio, video, and other signal waveforms are transformed. These transformers are intended to provide isolation from circuits that are either conductively connected to a branch circuit supply or connected to secondary circuits involving voltages that are considered to present a risk of electric shock by the nature of their use in an end-product.

    1.2 These requirements do not apply to transformers and motor-transformers that are connected to a supply circuit to power a secondary circuit.

  • 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 Housing
          • 7 Resistance to Corrosion
          • 8 Mechanical Assembly
          • 9 Impregnation
          • 10 Leads
            • 10.1 Insulation
            • 10.2 Connections between leads
            • 10.3 Strain relief
            • 10.4 Protection of wiring
          • 11 Terminal Support
          • 12 Transformer Insulation
          • 13 Spacings
          • 14 Double Protection
        • PERFORMANCE
          • 15 General
          • 16 Transformer Dielectric Voltage-Withstand Test
          • 17 Strain Relief Test
          • 18 Insulation Resistance Test
          • 19 Thermoplastic Bobbin Temperature Stability Test
          • 20 Insulating Materials Equivalence Test
          • 21 Insulating System Tests
            • 21.1 General
            • 21.2 Conditioning
            • 21.3 Dielectric voltage-withstand
            • 21.4 Voltage surge
        • MANUFACTURING AND PRODUCTION TEST
          • 22 Dielectric Voltage-Withstand Test
        • MARKINGS
          • 23 General
    • APPENDIX A