UL 497C
Standard for Protectors for Coaxial Communications Circuits

DETAILS
Edition Number:2SCC Approved:--
Edition Date:2001-08-03DOD Approved: --
Price Code:AANSI Approved: 2017-02-10
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover protectors for use on coaxial cable circuits to be used in accordance with the applicable requirements of the National Electrical Code, NFPA 70.

    1.2 As covered by these requirements, a coaxial cable circuit protector consists of single or multiple air gap arresters, gas tube arresters, or solid-state arresters, with or without fuses or other current-limiting devices. A circuit protector is intended to protect equipment, wiring, and personnel at the subscriber premises against the effects of excessive potentials and currents on the coaxial line caused by lightning, contacts with power conductors, power induction, or rises in ground potential.

    1.3 This standard does not cover the following:

    a)    Lightning protective devices for the protection of secondary distribution wiring systems and equipment.

    b)    Antenna discharge units for radio and television receiving appliances.

    c)    Lightning conductor and air terminals for connection of lightning rods for building protection.

    d)    Protectors for fire alarm signaling circuits that are covered by the Standard for Protectors for Data Communications and Fire-Alarm Circuits, UL 497B.

    e)    Equipment covered by the Standard for Secondary Protectors for Communications Circuits, UL 497A.

    f)    Equipment covered by the Standard for Transient Voltage Surge Suppressors, UL 1449.

    g)    Equipment covered by the Standard for Protectors for Paired-Conductor Communications Circuits, UL 497.

  • 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 Enclosures
            • 5.1 General
            • 5.2 Sheet metal
            • 5.3 Nonmetallic
          • 6 Protection Against Corrosion
            • 6.1 General
            • 6.2 Outdoor use
            • 6.3 Grommets
          • 7 Field-Wiring Connections
          • 8 Components
            • 8.1 General
            • 8.2 Arrester assemblies
            • 8.3 Electrical insulation material
          • 9 Spacings
        • PERFORMANCE
          • 10 General
          • 11 It Limiting Test
          • 12 Abnormal Sustained Current Test
          • 13 Component Temperature Test
          • 14 Breakdown Voltage Measurement Test
          • 15 Impulse Sparkover Voltage Measurement Test
          • 16 Limited Short-Circuit Test
          • 17 High Current Ground Path Test
          • 18 Cable Shield Fuse Test
          • 19 Endurance Conditioning Test
          • 20 Induced Low Current Test
          • 21 Distortion Test
          • 22 Flame Test
          • 23 Impact Test (Polymeric Enclosures)
          • 24 Jarring Test
          • 25 Water Spray Test
          • 26 Leakage Current Test
          • 27 Dielectric Voltage-Withstand Test
          • 28 Ultraviolet Light and Water Exposure
          • 29 Tensile Strength and Elongation Tests
          • 30 Air Oven Aging Test
          • 31 Ozone Exposure Test
          • 32 Indoor Corrosion Test
            • 32.1 General
            • 32.2 Hydrogen sulfide exposure
            • 32.3 Sulfur dioxide-carbon dioxide
          • 33 Outdoor Corrosion Test
            • 33.1 General
            • 33.2 Hydrogen sulfide exposure
            • 33.3 Sulfur dioxide-carbon dioxide exposure
            • 33.4 Salt spray exposure
        • MARKINGS
          • 34 General
        • INSTALLATION INSTRUCTIONS
          • 35 General