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  • AS 3439.1-1993

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Low-voltage switchgear and controlgear assemblies - Type-tested and partially type-tested assemblies

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

    Superseded date:  30-06-2017

    Language(s): 

    Published date:  01-01-1993

    Publisher:  Standards Australia

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

    1 - AS 3439.1-1993 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - TYPE-TESTED AND PARTIALLY TYPE-TESTED ASSEMBLIES
    4 - PREFACE
    8 - CONTENTS
    11 - 1 General
    11 - 1.1 Scope and object
    11 - 1.2 Normative references
    13 - 2 Definitions
    13 - 2.1 General
    13 - 2.1.1 Low-voltage switchgear and control gear assembly (ASSEMBLY)
    14 - 2.1.2 Main circuit (of an ASSEMBLY)
    14 - 2.1.3 Auxiliary circuit (of an ASSEMBLY)
    14 - 2.1.4 Busbar
    14 - 2.1.5 Functional unit
    14 - 2.1.6 Incoming unit
    15 - 2.1.7 Outgoing unit
    15 - 2.1.8 Functional group
    15 - 2.1.9 Test situation
    15 - 2.2 Constructional units of ASSEMBLIES
    15 - 2.2.1 Section
    15 - 2.2.2 Sub-section
    15 - 2.2.3 Compartment
    15 - 2.2.4 Barriered section or sub-section
    15 - 2.2.5 Transport unit
    15 - 2.2.6 Fixed part
    15 - 2.2.7 Removable part
    16 - 2.2.8 Withdrawable part
    16 - 2.2.9 Connected position
    16 - 2.2.10 Test position
    16 - 2.2.11 Disconnected position (isolated position)
    16 - 2.2.12 Removed position
    16 - 2.3 External design of ASSEMBLIES
    16 - 2.3.1 Open-type ASSEMBLY
    16 - 2.3.2 Dead-front ASSEMBLY
    16 - 2.3.3 Enclosed ASSEMBLY
    17 - 2.3.4 Busbar trunking system (busway)
    17 - 2.4 Structural parts of ASSEMBLI ES
    17 - 2.4.1 Supporting structure
    17 - 2.4.2 Mounting structure
    18 - 2.4.3 Mounting panel
    18 - 2.4.4 Mounting frame
    18 - 2.4.5 Enclosure
    18 - 2.4.6 Cover
    18 - 2.4.7 Door
    18 - 2.4.8 Removable cover
    18 - 2.4.9 Cover plate
    18 - 2.4.10 Partition
    18 - 2.4.11 Barrier
    18 - 2.4.12 Obstacle
    19 - 2.4.13 Shutter
    19 - 2.4.14 Cable entry
    19 - 2.5 Conditions of installation of ASSEMBLIES
    19 - 2.5.1 ASSEMBLY for indoor installation
    19 - 2.5.2 ASSEMBLY for outdoor installation
    19 - 2.5.3 Stationary ASSEMBLY
    19 - 2.5.4 Movable ASSEMBLY
    19 - 2.6 Protective measures with regard to electric shock
    19 - 2.6.1 Live part
    19 - 2.6.2 Exposed conductive part
    20 - 2.6.3 Protective conductor (PE)
    20 - 2.6.4 Neutral conductor (N)
    20 - 2.6.5 PEN conductor
    20 - 2.6.6 Fault current
    20 - 2.6.7 Earth fault current
    20 - 2.6.8 Protection against direct contact
    20 - 2.6.9 Protection against indirect contact
    20 - 2.7 Gangways within ASSEMBLIES
    20 - 2.7.1 Operating gangway within an ASSEMBLY
    20 - 2.7.2 Maintenance gangway within an ASSEMBLY
    20 - 2.8 Electronic functions
    20 - 2.8.1 Screening
    21 - 2.9 Insulation co-ordination
    21 - 2.9.1 Clearance
    21 - 2.9.2 Isolating distance (of a pole of a mechanical switching device)
    21 - 2.9.3 Creepage distance
    21 - 2.9.4 Working voltage
    21 - 2.9.5 Temporary overvoltage
    21 - 2.9.6 Transient overvoltages
    21 - 2.9.7 Impulse withstand voltage
    22 - 2.9.8 Power-frequency withstand voltage
    22 - 2.9.9 Pollution
    22 - 2.9.10 Pollution degree (of environmental conditions)
    22 - 2.9.11 Micro-environment (of a clearance or creepage distance)
    22 - 2.9.12 Overvoltage category (of a circuit or within an electrical system)
    22 - 2.9.13 Surge arrester
    23 - 2.9.14 Co-ordination of insulation
    23 - 2.9.15 Homogeneous (uniform) field
    23 - 2.9.16 Inhomogeneous (non-uniform) field
    23 - 2.9.17 Tracking
    23 - 2.9.18 Comparative tracking index (CTI)
    23 - 2.10 Short-circuit currents
    23 - 2.10.1 Short-circuit current (Ic) (of a circuit of an ASSEMBLY)
    23 - 2.10.2 Prospective short-circuit current (Icp) (of a circuit of an ASSEMBLY)
    23 - 2.10.3 Cut-off current; Let-through current
    24 - 3 Classification of ASSEMBLI ES
    24 - 4 Electrical characteristics of ASSEMBLIES
    24 - 4.1 Rated voltages
    24 - 4.1.1 Rated operational voltage (of a circuit of an ASSEMBLY)
    24 - 4.1.2 Rated insulation voltage (Ui) (of a circuit of an ASSEMBLY)
    24 - 4.1.3 Rated impulse withstand voltage (Uimp) (of a circuit of an ASSEMBLY)
    25 - 4.2 Rated current (of a circuit of an ASSEMBLY)
    25 - 4.3 Rated short-time withstand current (Icw) (of a circuit of an ASSEMBLY)
    25 - 4.4 Rated peak withstand current (Ipk) (of a circuit of an ASSEMBLY)
    25 - 4.5 Rated conditional short-circuit current (Icc) (of a circuit of an ASSEMBLY)
    26 - 4.6 Rated fused short-circuit current (Icf) (of a circuit of an ASSEMBLY)
    26 - 4.7 Rated diversity factor
    26 - 4.8 Rated frequency
    27 - 5 Information to be given regarding the ASSEMBLY
    27 - 5.1 Nameplates
    27 - 5.2 Markings
    28 - 5.3 Instructions for installation, operation and maintenance
    28 - 6 Service conditions
    28 - 6.1 Normal service conditions
    28 - 6.1.1 Ambient air temperature
    29 - 6.1.2 Atmospheric conditions
    30 - 6.1.3 Altitude
    30 - 6.2 Special service conditions
    30 - 6.3 Conditions during transport, storage and erection
    31 - 7 Design and construction
    31 - 7.1 Mechanical design
    31 - 7.1.1 General
    31 - 7.1.2 Clearances, creepage distances and isolating distances
    34 - 7.1.3 Terminals for external conductors
    36 - 7.2 Enclosure and degree of protection
    36 - 7.2.1 Degree of protection
    37 - 7.2.2 Measures to take account of atmospheric humidity
    37 - 7.3 Temperature rise
    39 - 7.4 Protection against electric shock
    39 - 7.4.1 Protection against both direct and indirect contact
    39 - 7.4.2 Protection against direct contact
    41 - 7.4.3 Protection against indirect contact
    46 - 7.4.4 Discharging of electrical charges
    47 - 7.4.5 Operating and maintenance gangways within ASSEMBLI ES
    47 - 7.4.6 Requirements related to accessibility in service by authorized personnel
    48 - 7.5 Short-circuit protection and short-circuit withstand strength
    48 - 7.5.1 General
    49 - 7.5.2 Information concerning the short-circuit withstand strength
    50 - 7.5.3 Relationship between peak and r.m.s. values of short-circuit current
    50 - 7.5.4 Co-ordination of short-circuit protective devices
    50 - 7.5.5 Circuits within an ASSEMBLY
    51 - 7.6 Switching devices and components installed in ASSEMBLIES
    51 - 7.6.1 Selection of switching devices and components
    52 - 7.6.2 Installation
    53 - 7.6.3 Fixed parts
    53 - 7.6.4 Removable parts and withdrawable parts
    56 - 7.6.5 Identification
    56 - 7.7 Internal separation of ASSEMBLIES by barriers or partitions
    57 - 7.8 Electrical connections inside an ASSEMBLY: bars and insulated conductors
    57 - 7.8.1 General
    58 - 7.8.2 Dimensions and rating of busbars and insulated conductors
    58 - 7.8.3 Wiring
    58 - 7.9 Requirements for electronic equipment supply circuits
    59 - 7.9.1 Input voltage variations
    59 - 7.9.2 Overvoltages
    60 - 7.9.3 Waveform
    61 - 7.9.4 Temporary variations in voltage and frequency
    61 - 7.10 Electromagnetic compatibility
    61 - 7.10.1 ASSEMBLIES not incorporating electronic equipment
    62 - 7.10.2 ASSEMBLIES incorporating electronic equipment
    62 - 8 Test specifications
    62 - 8.1 Classification of tests
    62 - 8.1.1 Type tests
    62 - 8.1.2 Routine tests
    63 - 8.1.3 Testing of devices and self-contained components incorporated in the ASSEMBLY
    63 - 8.2 Type tests
    63 - 8.2.1 Verification of temperature-rise limits
    69 - 8.2.2 Verification of dielectric properties
    73 - 8.2.3 Verification of short-circuit withstand strength
    78 - 8.2.4 Verification of the effectiveness of the protective circuit
    79 - 8.2.5 Verification of clearances and creepage distances
    79 - 8.2.6 Verificat ion of mechanical operation
    79 - 8.2.7 Verification of degree of protection
    80 - 8.2.8 Verification of the properties of insulating materials
    80 - 8.3 Routine tests
    80 - 8.3.1 Inspection of the ASSEMBLY including inspection of wiring and, if necessary, electrical operation test
    80 - 8.3.2 Dielectric test
    81 - 8.3.3 Checking of protective measures and of the electrical continuity of the protective circuits
    82 - 8.3.4 Verification of insulation resistance
    86 - Annex A - Minimum and maximum cross-sections of copper conductors suitable for connection
    87 - Annex B - Method of calculating the cross-sectional area of protective conductors with regard to thermal stresses due to current
    88 - Annex C - Typical examples of ASSEMBLIES
    98 - Annex D - Typical arrangements of forms of separation by barriers or partitions
    103 - Annex E - Items subject to agreement between manufacturer and user
    104 - Annex F - Measurement of creepage distances and clearances
    104 - F.1 Basic principles
    104 - F.2 Use of ribs
    110 - Annex G - Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of equipment
    113 - Annex H - Bibliography
    114 - APPENDIX AA - LIST OF VARIATIONS BETWEEN THIS STANDARD AND IEC 439-1
    122 - APPENDIX BB - INFORMATION TO BE SUPPLIED BY THE PURCHASER WHEN PLACING ENQUIRY OR ORDER
    122 - BB1 GENERAL
    122 - BB2 CONCERNING THE INDIVIDUAL CIRCUITS
    122 - BB2.1 Information relating to the supply and load circuit
    122 - BB2.2 Information relating to equipment in the assembly
    122 - BB2.3 Information relating to cables and busbar trunking systems.
    123 - BB3 CONCERNING THE ASSEMBLY AS A WHOLE
    123 - BB4 INFORMATION RELATING TO SPECIAL SERVICE AND INSTALLATION CONDITIONS
    124 - BB5 INFORMATION RELATING TO TESTS
    125 - APPENDIX CC - TYPES OF SYSTEM EARTHING
    125 - CC1 SCOPE
    125 - CC2 TN SYSTEMS
    127 - CC3 TT SYSTEM
    127 - CC4 IT SYSTEM
    128 - APPENDIX DD - GUIDELINES FOR ASSEMBLIES INTENDED TO PROVIDE INCREASED SECURITY AGAINST THE OCCURRENCE OR THE EFFECTS OF INTERNAL
    128 - DD1 INTRODUCTION
    128 - DD2 OBJECT
    128 - DD3 POSSIBLE CAUSES OF FAILURE
    129 - DD4 ARCING FAULT CONDITIONS
    129 - DD5 MINIMIZATION OF ARCING
    129 - DD6 MEANS OF ACHIEVEMENT
    131 - APPENDIX EE - INTERNAL ARCING- FAULT TESTS
    131 - EE1 INTRODUCTION
    131 - EE2 RELEVANCE OF TESTS
    131 - EE3 TESTS REQUIRED
    132 - EE4 PREPARATION FOR ARCING-FAULT TESTS
    132 - EE5 TEST PROCEDURE
    132 - EE5.1 General
    133 - EE5.2 Tests
    133 - EE6 SPECIAL TESTS
    134 - EE7 ASSESSMENT OF TEST RESULTS
    134 - EE8 TEST REPORTS
    135 - APPENDIX FF - SELECTION OF COMPONENTS
    135 - FF1 GENERAL
    135 - FF2 EXAMPLES OF FACTORS TO BE CONSIDERED
    135 - FF2.1 Effect on rated thermal current
    135 - FF2.2 Effect on rated short-circuit currents
    136 - APPENDIX GG - DIFFERENCES BETWEEN THIS STANDARD AND AS 1136.1-1988
    136 - GG1 INTRODUCTION
    136 - GG2 DIFFERENCES
    139 - APPENDIX HH - COMPARISON OF FORMS OF SEPARATION BETWEEN THIS STANDARD AND AS 1136.1-1988

    Abstract - (Show below) - (Hide below)

    Specifies requirements for type-tested and partially type-tested low voltage switchgear and controlgear assemblies for rated voltages up to 1000 volt a.c. at frequencies not exceeding 1000 Hz, or 1500 volt d.c. Applies to assemblies intended for use with generation, transmission, distribution and conversion of electrical energy and the control of electrical energy consuming equipment. This Standard is technically equivalent to and has been reproduced from IEC 439-1:1992.

    Scope - (Show below) - (Hide below)

    This International Standard applies to low-voltage switchgear and controlgear assemblies (type-tested assemblies (TTA) and partially type-tested assemblies (PTTA)), the rated voltage of which does not exceed 1 000 V a.c. at frequencies not exceeding 1 000 Hz, or 1 500 V d.c.This standard also applies to assemblies incorporating control and/or power equipment, the frequencies of which are higher.In this case, appropriate additional requirements shall apply.This standard applies to stationary or movable assemblies with or without enclosure.NOTE - Additional requirements for certain specific types of assemblies are given in supplementary IEC standards.This standard applies to assemblies intended for use in connection with generation, transmission, distribution and conversion of electric energy and for the control of electric energy consuming equipment.It also applies to such assemblies designed for use under special service conditions, for example in ships, in rail vehicles, for machine tools, for hoistingequipment,or in explosive atmospheres,and for domestic (operated by unskilled persons) applications, provided that the relevant specific requirements are complied with.This standard does not apply to individual devices and self-contained components, such as motor starters, fuse switches, electronic equipment, etc., complying with their relevant standards.The object of this standard is to lay down the definitions and to state the service conditions, construction requirements, technical characteristics and tests for low-voltage switchgear and controlgear assemblies.

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

    Committee EL-006
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes

    History - (Show below) - (Hide below)

    Under Revision see DR 98556 First published as AS 1136-1974.Second edition 1980.Revised and redesignated AS 1136.1-1988.Revised and redesignated AS 3439.1-1993. First published as AS 1136-1974. Second edition 1980. Revised and redesignated AS 1136.1-1988. Revised and redesignated AS 3439.1-1993.

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

    AS 1431.2-1989 Low voltage switchgear and controlgear - Control circuit devices and switching elements - Additional requirements for push-buttons and indicator lights
    AS 1136.1-1988 Low voltage switchgear and controlgear assemblies General requirements
    AS 1824.1-1995 Insulation co-ordination Definitions, principles and rules
    AS 1852.441-1985 International electrotechnical vocabulary - Switchgear, controlgear and fuses
    AS 1852.604-1988 International electrotechnical vocabulary Generation, transmission and distribution of electricity - Operation
    AS 1104-1978 Informative symbols for use on electrical and electronic equipment
    AS 1931.1-1996 High-voltage test techniques - General definitions and test requirements
    AS 1029.2-1982 Low voltage contactors - Semiconductor (solid state) (up to and including 1000 V a.c. and 1500 V d.c.)
    AS 3865-1991 Calculation of the effects of short-circuit currents
    AS 2279.4-1991 Disturbances in mains supply networks - Limitation of voltage fluctuations caused by industrial equipment
    AS 1852.471-1988 International electrotechnical vocabulary - Insulators
    AS 1202.1-1981 A.C. motor starters (up to and including 1000 V) - Direct-on-line (full voltage) starters
    AS 3702-1989 Item designation in electrotechnology
    AS 3000-1986 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules)
    AS 2467-1981 Maintenance of electrical switchgear
    AS 2926-1987 Standard voltages - Alternating (50 Hz) and direct
    AS 1939-1990 Degrees of protection provided by enclosures for electrical equipment (IP Code)
    AS 2279.2-1991 Disturbances in mains supply networks - Limitation of harmonics caused by industrial equipment
    AS 3650-1988 Low voltage switchgear and controlgear - Common requirements
    AS 2005.1-1981 Fuses with enclosed fuse-links (up to and including 1000 V a.c. and 1500 V d.c.) - General requirements
    AS 1955.2-1978 Semiconductor convertors Semiconductor self-commutated convertors
    AS 1307.1-1986 Surge arresters (diverters) - Silicon carbide type for a.c. systems
    AS 1775-1984 Low voltage switchgear and controlgear - Air-break switches, isolators and fuse-combination units (up to and including 1000 V a.c. and 1200 V d.c.)
    AS 1431.1-1989 Low voltage switchgear and controlgear - Control circuit devices and switching elements - General requirements

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

    AS 3439.2-1994 Low-voltage switchgear and controlgear assemblies - Particular requirements for busbar trunking systems (busways)
    AS 3439.3-1995 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
    AS/NZS 3439.5:2001 Low-voltage switchgear and controlgear assemblies Particular requirements for assemblies intended to be installed outdoors in public places - Cable distribution cabinets (CDCs) for power distribution in networks
    AS/NZS 3947.4.2:2000 Low-voltage switchgear and controlgear Contactors and motor-starters - A.C. semiconductor motor controllers and starters
    AS 4278-1995 A method for assessing the short-circuit withstand strength of partially type-tested assemblies (PTTA)
    AS/NZS 3947.1:1998 Low-voltage switchgear and controlgear General rules
    AS 3439.4-1995 Low-voltage switchgear and controlgear assemblies - Particular requirements for assemblies for construction sites (ACS)
    AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS 3947.4.2-1997 Low-voltage switchgear and controlgear - Contractors and motor starters - A.C. semiconductor motor controllers and starters
    AS/NZS 3947.4.3:2000 Low-voltage switchgear and controlgear Contactors and motor-starters - A.C. semiconductor controllers and contactors for non-motor loads
    AS 4388-1996 A method of temperature-rise assessment by extrapolation for partially type-tested assemblies (PTTA) of low-voltage switchgear and controlgear
    AS/NZS 3947.1:2001 Low-voltage switchgear and controlgear General rules
    AS 3947.7.2-1996 Low-voltage switchgear and controlgear - Ancillary equipment - Protective conductor terminal blocks for copper conductors
    AS 4086.2-1997 Secondary batteries for use with stand-alone power systems Installation and maintenance
    HB 301-2001 Electrical installations - Designing to the Wiring rules
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