UL 1066
Standard for Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures

DETAILS
Edition Number:4SCC Approved:--
Edition Date:2012-04-13DOD Approved: --
Price Code:AANSI Approved: 2017-03-22
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover low-voltage ac power circuit breakers as follows:

    a)    Stationary-mounted or drawout-mounted types,

    b)    2-pole, 3-pole, and 4-pole constructions,

    c)    Manually operated or power operated, and

    d)    With or without electromechanical or solid-state type trip device.


    1.1 revised effective April 13, 2017

    1.2 These requirements apply to drawout-mounted type low-voltage ac integrally fused power circuit breakers, consisting of low-voltage ac power circuit breakers with integral current limiters or fuses.


    1.2 revised effective April 13, 2017

    1.3 These requirements apply to low-voltage ac fuse draw-outs consisting of current limiters or fuses in a drawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a fused circuit breaker.


    1.3 revised effective April 13, 2017

    1.4 These requirements apply to general purpose type low-voltage dc power circuit breakers.


    1.4 revised effective April 13, 2017

    1.5 These requirements cover equipment intended for use in ordinary locations in accordance with the National Electrical Code, ANSI/NFPA 70.


    1.5 revised effective April 13, 2017

    1.6 These requirements are intended to supplement and be used in conjunction with the:

    a)     Standard for Low-Voltage AC Power Circuit Breakers Used In Enclosures, IEEE C37.13,

    b)     Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures, IEEE C37.14,

    c)     Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, IEEE C37.20.1,

    d)     Test Procedures for Switchgear – Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI C37.50, and

    e)     Conformance Test Procedures for Switchgear – Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51.


    1.6 revised effective April 13, 2017

    1.7 These requirements cover equipment rated 1000 V or less nominal, 1058 V maximum ac and 1500 V maximum dc.

    1.8 This Standard does not apply to molded-case circuit breakers.


    1.8 revised effective April 13, 2017

    1.9 These circuit breakers are intended for installation in circuit breaker enclosures, switchboards (switchgear), panelboards, and the like. Drawout-mounted devices are intended for use with specific adapters or receiving equipment. The acceptability of the combination of a circuit breaker with respect to any overall enclosure will be determined when the complete product is considered.


    1.9 revised effective April 13, 2017

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
          • 3 Components
          • 4 Units of Measurement
          • 5 Undated References
        • CONSTRUCTION
          • 6 General
          • 7 Corrosion Protection
          • 8 Insulating Materials
          • 9 Current-Carrying Parts
          • 10 Terminations
          • 11 Operating Mechanism
          • 12 Grounding
          • 13 Trip Devices
          • 14 Interlocks
          • 15 Control Circuit Wiring
          • 16 Control Circuit Field Wiring Connections
        • PERFORMANCE
          • 17 General
          • 18 Interlock Verification Tests
          • 19 Dielectric Voltage-Withstand Tests
          • 20 Grounding Resistance Tests
          • 21 Trip Device Calibration Tests
        • RATINGS
          • 22 General
        • MARKINGS
          • 23 General
    • INTEGRALLY MOUNTED, REMOTELY OPERATED RACKING MECHANISMS FOR USE WITH LOW VOLTAGE POWER CIRCUIT BREAKERS
    • APPENDIX A