UL 943
Ground-Fault Circuit-Interrupters

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2016-05-17DOD Approved: 1994-11-30
Price Code:DANSI Approved: 2016-05-17
Type:ulcsance

  • SCOPE

    1 Scope

    1.1 This Standard applies to Class A, single- and three-phase, ground-fault circuit-interrupters intended for protection of personnel, for use only in grounded neutral systems in accordance with the National Electrical Code (NEC), ANSI/NFPA 70, the Canadian Electrical Code, Part I, and Electrical Installations (Use), NOM-001-SEDE. These devices are intended for use on alternating current (AC) circuits of 120 V, 208Y/120 V, 120/240 V, 127 V, or 220Y/127 V, 60 Hz circuits.

    Note: In Canada, the text “intended for protection of personnel” is excluded.

    1.2 These requirements do not cover ground-fault circuit-interrupters intended for use in circuits served by a transformer having windings wholly insulated from each other.

    1.3 This Standard applies to all Class A ground-fault circuit-interrupters. These Class A GFCIs are permitted to be integrated into other devices, in which case, besides complying with this Standard, these devices are to comply with the corresponding applicable Standard for the device in question.

    1.4 This Standard includes minimum requirements for the function, construction, performance, and markings of ground-fault circuit-interrupters included in the scope.

    1.5 This Standard is intended to cover only Class A GFCI devices.

    1.6 This Standard also covers GFCIs of the self contained type that are intended for installation in a counter, such as would be suitable for installation in a kitchen or bathroom counter top.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Body
        • 1 Scope
        • 2 Normative References
        • 3 Definitions
        • 4 General
          • 4.1 Components
          • 4.2 Units of measurement
        • 5 Construction
          • 5.1 All types
          • 5.2 Resistance to corrosion
          • 5.3 Grounding and bonding
          • 5.4 Enclosure and housing
          • 5.5 Provision for connection to permanent wiring systems
          • 5.6 Insulation
          • 5.7 Accessibility of energized parts
          • 5.8 Internal wiring
          • 5.9 Field wiring
          • 5.10 Power-supply cord
          • 5.11 Receptacles
          • 5.12 Spacings
          • 5.13 Alternative spacings – clearances and creepage distances
          • 5.14 Operating mechanism
          • 5.15 Supervisory circuit
          • 5.16 Auto-monitoring function
        • 6 Tests
          • 6.1 General
          • 6.2 Polymeric enclosures
          • 6.3 Enclosure and housing – performance
          • 6.4 Representative devices
          • 6.5 Leakage current test
          • 6.6 Voltage surge test
          • 6.7 High-resistance ground fault
          • 6.8 Resistance to false tripping test
          • 6.9 Immunity to conducted disturbances, induced by RF fields
          • 6.10 Normal temperature test
          • 6.11 Dielectric voltage withstand test
          • 6.12 Overload and motor starting test
          • 6.13 Low-resistance ground fault test
          • 6.14 Endurance test
          • 6.15 Abnormal operation test
          • 6.16 Surge current test
          • 6.17 Abnormal overvoltage tests
          • 6.18 Extra-low-resistance ground faults test
          • 6.19 Short circuit test
          • 6.20 Dust test
          • 6.21 Corrosion test
          • 6.22 Visual inspection test
          • 6.23 Reverse line-load miswire test
          • 6.24 Reverse line-load miswire test - repeated
          • 6.25 Supplemental voltage surge immunity test
          • 6.26 Operating mechanism test
          • 6.27 Permanently connected GFCI end of life test
          • 6.28 GFCI receptacle temperature tests
          • 6.29 Mechanical endurance test
          • 6.30 Spill test
          • 6.31 Auto-monitoring function tests
        • 7 Markings
          • 7.1 Permanence of marking
          • 7.2 Marking
          • 7.3 Permanently connected ground-fault circuit-interrupters
          • 7.4 Portable ground-fault circuit-interrupters
        • 8 Installation Instructions
          • 8.1 General
          • 8.2 Permanently connected ground-fault circuit-interrupters
    • OPTIONAL 10 KA SHORT CIRCUIT CURRENT TEST FOR OUTLET-BOX TYPE GROUND-FAULT CIRCUIT-INTERRUPTERS
    • Annex A (Normative)Reference Standards
    • Annex B (Informative)French Translations and Markings
    • Annex C (Informative)Spanish Translations and Markings
    • Annex D (Informative)Reference Publications
    • Annex E (Normative in Canada and the United States; informative in Mexico)Installation Instructions – Configuration Drawings