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  • NEMA AB 1

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Molded-Case Circuit Breakers, Molded Case Switches, and Circuit-Breaker Enclosures

    Available format(s): 

    Withdrawn date:  23-07-2013

    Language(s): 

    Published date:  27-10-2004

    Publisher:  National Electrical Manufacturers Association

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    Table of Contents - (Show below) - (Hide below)

    Scope
    Purpose
    1 References, definitions, abbreviations and symbols
          References
          Definitions
          Abbreviations and symbols
    2 General
          Characteristics of molded case circuit breakers
          and molded case switches
    3 Construction requirements
          General
          Corrosion protection
          Operating mechanism
          Spacings
          Wire connectors
    4 Performance requirements and verification tests
          General
          Standard design verification tests
          Rated short-circuit current tests
    5 Periodic verification tests
    6 Field tests
    7 Specific application circuit breakers
          General
          Instantaneous trip circuit breakers
          Integrally fused circuit breakers
          Current limiting circuit breakers
          Marine circuit breakers
          Mining circuit breakers
          Molded case switches
          Electronic trip unit circuit breakers
          Switching duty circuit breakers
          Circuit breakers having a short-time withstand
            current rating
    8 Accessories
          General
          General requirements
          Shunt-trip release
          Undervoltage trip release
          Auxiliary and alarm switches
          Electrical operator
          Fuse accessory package
          Mechanical interlock
          Handle lock
    9 Circuit breaker and molded case switch enclosures
          Enclosures for general use
          Test enclosures
    10 Marking requirements
          Circuit breaker marking(s)
          Molded case switch marking(s)
          Accessory marking(s)
          Marking of enclosures
          Marking information
    11 Determination of short-circuit current, power
        factor, and recovery voltage
          Instrumentation
          Circuit conditions
          Alternating current circuits of 10,000 Amperes or
            less
          Alternating current circuits of greater than
            10,000 Amperes
          Recovery voltage
          Direct current calibration
    12 Clearances and creepage distances for circuit
        breakers
    Appendix
    A Determination of short-circuit currents in low-
        voltage systems
          Three-phase systems
          Single-phase, 3-wire, 120/240-volt systems

    Abstract - (Show below) - (Hide below)

    This Standard is no longer for sale on the NEMA website. NEMA AB 1 is equivalent to the current edition of UL 489. To purchase this Standard, click here or contact IHS at 800-854-7179 or 303-397-7956 (outside the U.S.)

    General Product Information - (Show below) - (Hide below)

    Document Type Standard
    Publisher National Electrical Manufacturers Association
    Status Withdrawn

    Standards Referenced By This Book - (Show below) - (Hide below)

    MIL-C-13962 Revision B:1966 CRUSHING, SCREENING, AND WASHING PLANTS, DIESEL-ENGINE AND ELECTRIC-MOTOR DRIVEN, 225-TONS PER HOUR
    ANS 57.7 : 88(R1997) DESIGN CRITERIA FOR AN INDEPENDENT SPENT FUEL STORAGE INSTALLATION (WATER POOL TYPE)
    IEEE 241 : 1990 ELECTRIC POWER SYSTEMS IN COMMERCIAL BUILDINGS
    MIL-G-19826 Revision F:1984 GENERATOR SET, DIESEL ENGINE, ALTERNATING CURRENT FOR FACILITIES CONSTRUCTION, 1O KW THRU 500 KW (NOT STOCKED)
    IEEE 902-1998 IEEE Guide for Maintenance, Operation, and Safety of Industrial and Commercial Power Systems (Yellow Book)
    IEEE 141 : 1993 IEEE Recommended Practice for Electric Power Distribution for Industrial Plants
    IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems (IEEE Buff Book)
    OO-P-2895 Base Document:1997 PLANT, AGGREGATE, SECONDARY, WITH CONE CRUSHER, MOBILE, 75 TON PER HOUR CAPACITY
    IEEE 551 : 2006 CALCULATING SHORT-CIRCUIT CURRENTS IN INDUSTRIAL AND COMMERCIAL POWER SYSTEMS
    CC-G-2745 Base Document:1984 GENERATOR SETS, DIESEL ENGINE, ALTERNATING CURRENT, FOR FACILITIES CONSTRUCTION; 10 KW THROUGH 1000 KW (NOT STOCKED)
    MIL-PRF-32109 Base Document:2002 FLOODLIGHT SET, ELECTRIC, PORTABLE
    NEMA SM 24-1991 (R1997, R2002) LAND BASED STEAM TURBINE GENERATOR SETS 0 TO 33,000 kW
    NEMA PB 1:2011 Panelboards
    NEMA KS 1:2013 Heavy Duty Enclosed and Dead-Front Switches (600 Volts Maximum)
    NEMA AB 5-2011 Establishing Levels of Selective Coordination for Low Voltage Circuit Breakers
    NEMA ICS 2:2008 Controllers, Contactors and Overload Relays Rated 600 V
    NEMA ICS 2-1996, Part 8 (R2004, R2009) INDUSTRIAL CONTROL AND SYSTEMS CONTROLLERS, CONTACTORS, AND OVERLOAD RELAYS RATED NOT MORE THAN 2000 VOLTS AC OR 750 VOLTS DC- PART 8: DISCONNECT DEVICES FOR USE IN INDUSTRIAL CONTROL EQUIPMENT
    NEMA BU 2 : 1996 MAJOR REQUIREMENTS RELATED TO THE APPLICATION AND TESTING OF LOW VOLTAGE BUSWAY
    ANSI/NEMA AB 3:2013 Molded-Case Circuit Breakers and Their Application
    IEEE 1205-2014 IEEE Guide for Assessing, Monitoring, and Mitigating Aging Effects on Electrical Equipment Used in Nuclear Power Generating Stations and Other Nuclear Facilities
    IEEE C37.26-2014 REDLINE IEEE Guide for Methods of Power-Factor Measurement for Low-Voltage (1000 V AC or lower) Inductive Test Circuits
    IEEE 1818-2017 IEEE Guide for the Design of Low-Voltage Auxiliary Systems for Electric Power Substations

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 60898:1995 Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations
    NEMA 250 : 2014 ENCLOSURES FOR ELECTRICAL EQUIPMENT (1000 VOLTS MAXIMUM)
    IEC 60947-1:2007+AMD1:2010+AMD2:2014 CSV Low-voltage switchgear and controlgear - Part 1: General rules
    ANSI/NEMA AB 3:2013 Molded-Case Circuit Breakers and Their Application
    NEMA AB 4:2017 Guidelines for Inspection and Preventive Maintenance of Molded-Case Circuit Breakers Used in Commercial and Industrial Applications
    IEC 60947-2:2016 Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
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