UL 497A
Standard for Secondary Protectors for Communications Circuits

DETAILS
Edition Number:3SCC Approved:--
Edition Date:2001-03-20DOD Approved: --
Price Code:AANSI Approved: 2017-02-10
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover secondary protectors for use in single- or multiple-pair-type communications circuits that are intended to be installed in accordance with Article 800 of the National Electrical Code, ANSI/NFPA 70.

    1.2 Secondary protectors are intended to be used in the protected side of telecommunications networks that have an operating rms voltage to ground less than 150 volts and installed or used in accordance with the National Electrical Code, NFPA 70.

    1.3 These requirements do not cover telephone protectors that are covered by the Standard for Protectors for Paired-Conductor Communications Circuits, UL 497. These requirements do not cover telephone equipment such as telephone answering devices, residential telephone instruments, telephone dialers, cordless telephones, key systems, and private-branch exchange equipment that is covered by the Standard for Information Technology Equipment - Safety - Part 1: General Requirements, UL 60950-1.

    1.4 These requirements do not cover cellular telephones or other receiver/transmitter-type devices. Equipment of this type is covered by the Standard for Audio-Video Products and Accessories, UL 1492.

    1.5 These requirements may be used, directly or by reference, to investigate portions of other equipment not classified as telecommunications equipment accessories and that may be connected to a telecommunications network, insofar as they may be applicable to such equipment.

    1.6 These requirements do not cover wires and cables intended to be permanently installed in a building in accordance with Article 800 of the National Electrical Code, NFPA 70.

    1.7 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Undated references
          • 3 Glossary
        • CONSTRUCTION
          • 4 General
          • 5 Product Assembly
          • 6 Enclosures
            • 6.1 General
            • 6.2 Enclosure top openings
            • 6.3 Enclosure side openings
            • 6.4 Enclosure bottom openings
          • 7 Internal Materials
          • 8 Accessibility and Electric Shock
          • 9 Mechanical Assembly
          • 10 Protection Against Corrosion
          • 11 Cords
            • 11.1 Strain relief
            • 11.2 Bushings
          • 12 Current-Carrying Parts
          • 13 Internal Wiring
            • 13.1 General
            • 13.2 Splices and connections
          • 14 Interconnecting Cords and Cables
            • 14.1 General
            • 14.2 Separation of circuits
            • 14.3 Terminal and connectors
          • 15 Insulating Material
          • 16 Printed-Circuit Board
          • 17 Overcurrent (Overload) Devices
          • 18 Spacings
        • RISK OF INJURY TO PERSONS
          • 19 General
          • 20 Modular Jacks
          • 21 Sharp Edges
          • 22 Stability
          • 23 Protection of Service Personnel
        • PERFORMANCE
          • 24 General
          • 25 Breakdown Voltage Measurement Test
          • 26 Impulse Voltage Measurement Test
          • 27 Overvoltage Test
            • 27.1 General
            • 27.2 Test method
          • 28 Endurance Conditioning
          • 29 Component Temperature Test
          • 30 Drop Test
          • 31 Impact Test
          • 32 Crush Test
          • 33 Strain Relief Test
          • 34 Leakage Current Test
          • 35 Dielectric Voltage-Withstand Test
          • 36 Rain Test
          • 37 Maximum Moment Measurement Test
          • 38 Weatherometer and Micro Tensile Strength Test
          • 39 Thermal Aging and Flame Test
          • 40 Electric Shock Current Test
        • MANUFACTURING AND PRODUCTION-LINE TEST
          • 41 Dielectric Voltage-Withstand Test
        • MARKING
          • 42 General
          • 43 Installation Instructions
          • 44 Instruction Manual
    • APPENDIX A
    • APPENDIX B – INFORMATION RELATING TO THE TESTING LABORATORY DIELECTRIC VOLTAGE-WITHSTAND TEST (TYPE TEST) AND THE PRODUCTION-LINE DIELECTRIC VOLTAGE-WITHSTAND TEST (ROUTINE TEST)