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  • AS/NZS 4898:1997

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Approval and test specification - Circuit-breakers for overcurrent protection for household and similar installations

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s):  English

    Published date:  05-06-1997

    Publisher:  Standards Australia

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

    1 - AS/NZS 4898:1997 APPROVAL AND TEST SPECIFICATION-CIRCUIT-BREAKERS FOR OVERCURRENT PROTECTION FOR HOUSEHOLD AND SIMILAR...
    4 - PREFACE
    7 - CONTENTS
    9 - 1.1 Scope
    10 - 1.2 Object
    10 - 2 Normative references
    11 - 3 Definitions
    11 - 3.1 Devices
    11 - 3.1.1 switching device (IEV 441-14-01):
    11 - 3.1.2 mechanical switching device (IEV 441-14-02):
    11 - 3.1.3 fuse (IEV 441-18-01):
    11 - 3.1.4 circuit-breaker (mechanical) (IEV 441-14-20):
    11 - 3.1.5 plug-in circui t-breaker:
    12 - 3.2 General terms
    12 - 3.2.1 overcurrent (IEV 441-11-06):
    12 - 3.2.2 overload current:
    12 - 3.2.3 short-circuit current (IEV 441-11-07):
    12 - 3.2.4 main circuit (of a circuit-breaker):
    12 - 3.2.5 control circuit (of a circuit-breaker):
    12 - 3.2.6 auxiliary circuit (of a circuit-breaker):
    12 - 3.2.7 pole (of a circuit-breaker):
    12 - 3.2.8 closed position:
    12 - 3.2.9 open position:
    13 - 3.2.10 Air temperature
    13 - 3.2.11 operation:
    13 - 3.2.12 operating cycle:
    13 - 3.2.13 operation sequence (IEV 441-16-03):
    13 - 3.2.14 uninterrupted duty:
    13 - 3.3 Constructional elements
    13 - 3.3.1 main contact:
    13 - 3.3.2 arcing contact (IEV 441-15-08):
    13 - 3.3.3 control contact:
    13 - 3.3.4 auxiliary contact:
    13 - 3.3.5 release:
    13 - 3.3.6 overcurrent release:
    14 - 3.3.7 inverse time-delay overcurrent release:
    14 - 3.3.8 direct overcurrent release:
    14 - 3.3.9 overload release:
    14 - 3.3.10 conductive part:
    14 - 3.3.11 exposed conductive part:
    14 - 3.3.12 terminal:
    14 - 3.3.13 screw-type terminal:
    14 - 3.3.14 pillar terminal:
    14 - 3.3.15 screw terminal:
    14 - 3.3.16 stud terminal:
    15 - 3.3.17 saddle terminal:
    15 - 3.3.18 lug terminal:
    15 - 3.3.19 screwless terminal:
    15 - 3.3.20 plug-in terminal:
    15 - 3.3.21 tapping screw:
    15 - 3.3.22 thread-forming tapping screw:
    15 - 3.3.23 thread-cutting tapping screw:
    15 - 3.4 Conditions of operation
    15 - 3.4.1 closing operation:
    15 - 3.4.2 opening operation:
    16 - 3.4.3 dependent manual operation (IEV 441-16-13):
    16 - 3.4.4 independent manual operation (IEV 441-16-16):
    16 - 3.4.5 trip-free circuit-breaker:
    16 - 3.5 Characteristic quantities
    16 - 3.5.1 rated value:
    16 - 3.5.2 prospective current (of a circuit, and with respect to a circuit-breaker) (IEV 441-17-01):
    16 - 3.5.3 prospective peak current (IEV 441-17-02):
    16 - 3.5.4 maximum prospective peak current (of an a.c. circuit) (IEV 441-17-04):
    16 - 3.5.5 short-circuit (making and breaking) capacity:
    17 - 3.5.6 breaking current:
    17 - 3.5.7 applied voltage:
    17 - 3.5.8 recovery voltage (IEV 441-17-25):
    17 - 3.5.9 opening time:
    17 - 3.5.10 Arcing time (IEV 441-17-37)
    18 - 3.5.11 break time:
    18 - 3.5.12 I2t (Joule integral):
    18 - 3.5.13 I2t characteristic of a circuit-breaker:
    18 - 3.5.14 Coordination between overcurrent protective devices in series
    18 - 3.5.15 conventional non-tripping current ( Int ):
    18 - 3.5.16 conventional tripping current (It):
    19 - 3.5.17 instantaneous tripping current:
    19 - 3.5.18 clearance (IEV 441-17-31):
    19 - 3.5.19 creepage distance:
    19 - 4 Classification
    19 - 4.1 According to the number of poles:
    19 - 4.2 According to the protection against external influences:
    19 - 4.3 According to the method of mounting:
    20 - 4.4 According to the method of connection:
    20 - 4.5 According to the instantaneous tripping current (see 3.5.17):
    20 - 4.6 According to the I2t characteristic:
    20 - 5 Characteristics of circuit-breakers
    20 - 5.1 List of characteristics
    21 - 5.2 Rated quantities
    21 - 5.2.1 Rated voltages
    21 - 5.2.2 Rated current (In)
    21 - 5.2.3 Rated frequency
    21 - 5.2.4 Rated short-circuit capacity (Icn)
    22 - 5.3 Standard and preferred values
    22 - 5.3.1 Preferred values of rated voltage
    22 - 5.3.2 Preferred values of rated current
    22 - 5.3.3 Standard values of rated frequency
    23 - 5.3.4 Values of rated short-circuit capacity
    23 - 5.3.5 Standard ranges of instantaneous tripping
    23 - 6 Marking and other product information
    25 - 7 Standard conditions for operation in service
    25 - 7.1 Ambient air temperature range
    25 - 7.2 Altitude
    25 - 7.3 Atmospheric conditions
    25 - 7.4 Conditions of installation
    25 - 8 Requirements for construction and operation
    25 - 8.1 Mechanical design
    25 - 8.1.1 General
    26 - 8.1.2 Mechanism
    27 - 8.1.3 Clearances and creepage distances (see annex B)
    29 - 8.1.4 Screws, current-carrying parts and connections
    30 - 8.1.5 Terminals for external conductors
    32 - 8.1.6 Non-interchangeability
    32 - 8.1.7 Mechanical mounting of plug-in type circuit-breakers
    32 - 8.2 Protection against electric shock
    33 - 8.3 Dielectric properties
    34 - 8.4 Temperature rise
    34 - 8.4.1 Temperature-rise limits
    34 - 8.4.2 Ambient air temperature
    34 - 8.5 Uninterrupted duty
    34 - 8.6 Automatic operation
    34 - 8.6.1 Standard time-current zone
    36 - 8.6.2 Conventional quantities
    36 - 8.6.3 Tripping characteristic
    37 - 8.7 Mechanical and electrical endurance
    37 - 8.8 Performance at short-circuit currents
    37 - 8.9 Resistance to mechanical shock and impact
    37 - 8.10 Resistance to heat
    37 - 8.11 Resistance to abnormal heat and to fire
    37 - 8.12 Resistance to rusting
    38 - 9 Tests
    38 - 9.1 Type tests and test sequences
    38 - 9.1.1 The characteristics of circuit -breakers are verified by means of type tests.
    38 - 9.1.2 For the purpose of verification of conformity with the standard, type tests are carried out in test sequences.
    38 - 9.2 Test conditions
    39 - 9.3 Test of indelibility of marking
    40 - 9.4 Test of reliability of screws, current-carrying parts and connections
    41 - 9.5 Test of reliability of terminals for external conductors
    43 - 9.6 Test of protection against electric shock
    43 - 9.7 Test of dielectric properties
    43 - 9.7.1 Resistance to humidity
    44 - 9.7.2 Insulation resistance of the main circuit
    45 - 9.7.3 Dielectric strength of the main circuit
    45 - 9.7.4 Dielectric strength of the auxiliary and control circuits
    45 - 9.7.5 Value of test voltage
    46 - 9.8 Test of temperature rise and measurement of power loss
    46 - 9.8.1 Ambient air temperature
    46 - 9.8.2 Test procedure
    46 - 9.8.3 Measurement of the temperature of parts
    47 - 9.8.4 Temperature rise of a part
    47 - 9.8.5 Measurement of power loss
    47 - 9.9 28-day test
    48 - 9.10 Test of tripping characteristic
    48 - 9.10.1 Test of time-current characteristic
    48 - 9.10.2 Test of instantaneous tripping
    49 - 9.10.3 Test of effect of single-pole loading on the tripping characteristic of multipole circuit-breakers
    49 - 9.10.4 Test of effect of ambient temperature on the tripping characteristic
    49 - 9.11 Test of mechanical and electrical endurance
    49 - 9.11.1 General test conditions
    50 - 9.11.2 Test procedure
    50 - 9.11.3 Condition of the circuit -breaker after test
    51 - 9.12 Short-circuit tests
    51 - 9.12.1 General
    51 - 9.12.2 Values of test quantities
    52 - 9.12.3 Tolerances on test quantities
    52 - 9.12.4 Test circuit for short-circuit performance
    53 - 9.12.5 Power factor of the test circuit
    54 - 9.12.6 Measurement and verification of I2t and of the peak current
    54 - 9.12.7 Calibration of the test circuit
    54 - 9.12.8 Interpretation of records
    54 - 9.12.9 Condition of the circuit-breaker for test
    56 - 9.12.10 Behaviour of the circuit -breaker during short-circuit tests
    56 - 9.12.11 Test procedure
    61 - 9.12.12 Verification of the circuit -breaker after short-circuit tests
    62 - 9.13 Test of resistance to mechanical shock and impact
    62 - 9.13.1 Mechanical shock
    63 - 9.13.2 Mechanical impact
    66 - 9.14 Test of resistance to heat
    67 - 9.15 Resistance to abnormal heat and to fire (glow-wire test)
    68 - 9.16 Test of resistance to rusting
    81 - Annex A - Determination of short-circuit power factor
    82 - Annex B - Determination of clearances and creepage distances
    85 - Annex C - Number of samples to be submitted and test sequences to be applied for verification of conformity
    85 - C.1 Test sequences
    86 - C.2 Number of samples to be submitted for full test procedure and acceptance criteria
    87 - C.3 Number of samples to be submitted for simplified test procedure
    90 - Annex D - Coordination of circuit-breakers with separate fuses associated in the same circuit
    90 - D.1 Introductory remarks
    91 - D.2 Scope and object
    91 - D.3 General requirements for the co-ordination of circuit-breakers with associated fuse(s)
    92 - D.4 Type and characteristics of the associated fuses
    92 - D.5 Methods for verification of the co-ordination
    95 - Annex E - Special requirements for auxiliary circuits for safety extra-low voltage
    96 - Annex F - Examples of terminals
    99 - Annex G - Correspondence between ISO and AWG copper conductors
    100 - Annex H - Arrangement for short-circuit test
    103 - ANNEX ZZ - VARIATIONS TO IEC 898:1995 FOR AUSTRALIAN/NEW ZEALAND CONDITIONS
    103 - ZZ1 INTRODUCTION
    103 - ZZ2 VARIATIONS

    Abstract - (Show below) - (Hide below)

    Specifies essential safety and associated requirements, for approval and test purposes, for air-break circuit-breakers for operation at 50 Hz or 60 Hz, having a rated voltage not exceeding 440 V (between phases), a rated current not exceeding 125 A and a rated short-circuit capacity not exceeding 25 000 A. Annex ZZ lists variations for Australian and New Zealand conditions. This Standard is based on, but not equivalent to, and reproduced from, IEC 898:1995.

    Scope - (Show below) - (Hide below)

    This standard applies to a.c. air-break circuit-breakers for operation at 50 Hz or 60 Hz, having a rated voltage not exceeding 440 V (between phases), a rated current not exceeding 125 A and a rated short-circuit capacity not exceeding 25 000 A. As far as possible, it is in line with the requirements contained in IEC 947-2.These circuit-breakers are intended for the protection against overcurrents of wiring installations of buildings and similar applications; they are designed for use by uninstructed people and for not being maintained.This standard also applies to circuit-breakers having more than one rated current, provided that the means for changing from one discrete rating to another is not accessible in normal service and that the rating cannot be changed without the use of a tool.This standard does not apply to:- circuit-breakers intended to protect motors,- circuit-breakers, the current setting of which is adjustable by means accessible to the user.For circuit-breakers having a degree of protection higher than IP20 according to IEC 529, for use in locations where arduous environmental conditions prevail (e.g. excessive humidity, heat or cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to occur) special constructions may be required.Requirements for circuit-breakers which incorporate residual current tripping devices are to be found in IEC 1009-1, IEC 1009-2-1, and IEC 1009-2-2.A guide for coordination of circuit-breakers with fuses is given in annex D.NOTES1 Circuit-breakers within the scope of this standard are considered as suitable for isolation (see 8.1.3).Special installation precautions (e.g. use of adequate lightning arresters) may be necessary when excessive overvoltages are likely to occur on the supply side (e.g. in the case of supply through overhead lines).2 Circuit-breakers within the scope of this standard may also be used for protection against electric shock, in case of a fault, depending on their tripping characteristics and on the characteristics of the installation.3 The criterion of application for such purposes is dealt with by installation rules.

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

    Committee EL-004
    Document Type Standard
    Product Note To run concurrently with AS 3111-1994 for 10 years
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    First published as Joint Standard AS/NZS 4898:1997.

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

    AS 1852.441-1985 International electrotechnical vocabulary - Switchgear, controlgear and fuses
    AS 3147-1992 Approval and test specification - Electric cables - Thermoplastic insulated - For working voltages up to and including 0.6/1 kV
    AS 2005.10-1988 Low voltage fuses - Fuses with enclosed fuse-links - General requirements
    AS 3100-1990 Approval and test specification - General requirements for electrical equipment
    AS 2926-1987 Standard voltages - Alternating (50 Hz) and direct
    AS 1104-1978 Informative symbols for use on electrical and electronic equipment
    AS 1939-1990 Degrees of protection provided by enclosures for electrical equipment (IP Code)
    AS 3000-1986 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules)

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

    AS/NZS 3105:2002 Approval and test specification - Electrical portable outlet devices
    AS/NZS 61558.2.6:2001 Safety of power transformers, power supply units and similar Particular requirements for safety isolating transformers for general use (IEC 61558-2-6:1997, MOD)
    AS/NZS 60269.3.1:2002 Low-voltage fuses Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications) - Sections I to IV: Examples of types of standardized fuses
    AS/NZS 3190:2002 Approval and test specification - Residual current devices (current-operated earth-leakage devices)
    AS/NZS 3439.3:2002 Low-voltage switchgear and controlgear assemblies Particular requirements for low voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use - Distribution boards (IEC 60439-3:1990 MOD)
    AS/NZS 3947.2:2002 Low-voltage switchgear and controlgear Circuit-breakers
    AS 3947.2-1997 Low-voltage switchgear and controlgear - Circuit-breakers
    AS/NZS 3003:2003 Electrical installations - Patient treatment areas of hospitals and medical, dental practices and dialyzing locations
    AS/NZS 61009.1:1999 Residual current operated circuit breakers with integral overcurrent protection for household and similar uses (RCBOs) General rules
    AS/NZS 3012:2003 Electrical installations - Construction and demolition sites
    AS/NZS 61558.1:2000 Safety of power transformers, power supply units and similar General requirements and tests (IEC 61558-1 Ed 1.1, MOD)
    AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS/NZS 3017:2001 Electrical installations - Testing and inspection guidelines
    HB 301-2001 Electrical installations - Designing to the Wiring rules
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