UL 697
Standard for Toy Transformers

DETAILS
Edition Number:7SCC Approved:--
Edition Date:2011-03-03DOD Approved: --
Price Code:BANSI Approved: 2016-08-15
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover toy transformers designed to be used on nominal 120-V branch circuits. A toy transformer is a step-down isolating transformer of the low-secondary-voltage type. It is intended primarily to supply current to electrically operated toys, and as such is expected to be subjected to careless use and probable short circuit of the secondary terminals. Accordingly, the design of a toy transformer takes into consideration the rather unusual risk of fire that may be involved, and the construction is made to reduce the risk of fire with respect to the ignition of nearby combustible material as the result of overheating or eventual inoperative condition of the transformer itself.

    1.2 These requirements do not cover toys or the like designed to operate from the secondary output of a toy transformer.

    1.3 Toy transformers marked "Class 2" are evaluated to the requirements in the Standard for Class 2 Power Units, UL 1310, and to the requirements in this Standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 General
          • 7 Mechanical Assembly
          • 8 Enclosure
            • 8.1 General
            • 8.2 Enclosure – direct plug-in type
          • 9 Sharp Edges and Corners
          • 10 Corrosion Protection
          • 11 Exposed Parts
          • 12 Coatings, Paints, Lacquers, and the Like
          • 13 Insulating Material
          • 14 Switches
          • 15 Coil Insulation
          • 16 Power Supply Connections
          • 17 Output Connections
          • 18 Strain Relief
          • 19 Bushings
          • 20 Internal Wiring
          • 21 Spacings
          • 22 Alternate Spacings
          • 23 Separation of Circuits
          • 24 Printed-Wiring Boards
        • PERFORMANCE
          • 25 General
          • 26 Leakage Current Test
          • 27 Leakage Current and Dielectric Voltage-Withstand Test After Humidity Exposure
          • 28 Maximum Secondary Voltage Test
          • 29 Power Input Test
          • 30 Output Test
          • 31 Heating Test
          • 32 Output Loading Test
          • 33 Component Breakdown Test
          • 34 Printed-Wiring Board Abnormal Operation Test
          • 35 Dielectric Voltage-Withstand Test
          • 36 Push-Back Relief Test
          • 37 Power Supply Strain Relief Test
          • 38 Output Strain Relief Test
          • 39 Endurance Test
          • 40 Overload Test on Primary Switches
          • 41 Overload Test on Secondary Switches
          • 42 Abuse Test
          • 43 Direct Plug-In Blade Secureness Test
          • 44 Direct Plug-In Security of Input Contacts Test
          • 45 Rod Pressure Test on Direct Plug-In Units
          • 46 Resistance to Crushing Test on Direct Plug-In Units
          • 47 Handles and Knobs Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 48 Details
        • RATINGS
          • 49 General
        • MARKINGS
          • 50 General
          • 51 Flexible-Film Bags
          • 52 Form
          • 53 Package Labeling
        • INSTRUCTIONS
          • 54 General
    • APPENDIX A