UL 98B
Outline of Investigation for Enclosed and Dead-front Switches for use in Photovoltaic Systems

DETAILS
Edition Number:3SCC Approved:--
Edition Date:2015-02-04DOD Approved: --
Price Code:AANSI Approved: --
Type:outline

  • SCOPE

    1 Scope

    1.1 These requirements cover open, enclosed and dead-front switches rated up to 1500 V dc, intended for use in dc photovoltaic (PV) systems and installed in accordance with Article 690 of the National Electrical Code, ANSI/NFPA-70. These switches are intended for ambient conditions between minus 20 to +50°C.

    1.2 These requirements are intended to be used in conjunction with requirements in the Standard for Enclosed and Dead-Front Switches,UL 98, except as modified or supplemented by the following requirements.

    1.3 Unless otherwise specified, when the term switch is used in this outline, it refers to a photovoltaic, enclosed, open, or dead-front switch.

    1.4 Fusible switches are intended for use with photovoltaic (PV) fuses which comply with the requirements of Outline for Low-Voltage Fuses – Fuses for Photovoltaic Systems,UL 2579.

    1.5 These requirements also apply to open type switches, used in conjunction with the Outline of Investigation for Open Type Switches,UL 98A.

    1.6 These requirements also cover fused and unfused electrically tripped PV switches.

  • TABLE OF CONTENTS
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    • Outline Title Page
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 General
          • 7 Spacings
          • 8 Wire Terminals
          • 9 Bus Bars
          • 10 Enclosure Doors
          • 11 Fusing
          • 12 Wiring and Bending Space
        • PERFORMANCE
          • 13 General
          • 14 Heating Test
          • 15 Endurance Test
          • 16 Close-Open Test
          • 17 Short Circuit Withstand Test
          • 18 Electrically Tripped Switches
            • 18.1 General
            • 18.2 Heating test
            • 18.3 Endurance test for electrically tripped switches
            • 18.4 Contact opening test for electrically tripped switches
          • 19 Mold Stress Relief Test
          • 20 Strength of Insulating Base and Support Test
          • 21 Wire Terminals for Other Class and Strand Configurations
        • RATINGS
          • 22 General
        • MARKINGS
          • 23 General
        • ACCESSORIES
          • 24 Construction
            • 24.1 General
            • 24.2 Mounting
            • 24.3 Field wiring
            • 24.4 Strain relief
            • 24.5 Spacings
            • 24.6 Electrical tripping mechanism
            • 24.7 Overvoltage-trip release devices
            • 24.8 Electrical operators
            • 24.9 Alarm and auxiliary switches
            • 24.10 Alarm switches
          • 25 PERFORMANCE
            • 25.1 General
            • 25.2 Electrical tripping mechanism
            • 25.3 (Reserved)
            • 25.4 Overvoltage-trip release devices
            • 25.5 Electrical operators
            • 25.6 Alarm and auxiliary switches
          • 26 Ratings
          • 27 Markings