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  • AS/NZS 3108:1994

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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 - Particular requirements for isolating transformers and safety isolating transformers

    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    Superseded date:  30-06-2017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:  01-01-1994

    Publisher:  Standards Australia

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    1 - AS / NZS 3108:1994 APPROVAL AND TEST SPECIFICATION - PARTICULAR REQUIREMENTS FOR ISOLATING TRANSFORMERS AND SAFETY ISOLATING
    4 - PREFACE
    7 - CONTENTS
    9 - CHAPTER 1 GENERAL REQUIREMENTS
    9 - 1 SCOPE
    9 - 2 DEFINITIONS
    10 - 2.1 Safety extra-low voltage (SELV)
    10 - 2.2 Power transformer
    10 - 2.3 Isolating transformer
    10 - 2.4 Safety isolating transformer
    10 - 2.5 Flush-type transformer
    10 - 2.6 Associated transformer
    10 - 2.7 Incorporated transformer
    10 - 2.8 Transformer for specific use
    10 - 2.9 Input winding
    10 - 2.10 Output winding
    10 - 2.11 Rated supply voltage
    10 - 2.12 Rated supply voltage range
    10 - 2.13 Rated frequency
    10 - 2.14 Rated output current
    11 - 2.15 Rated output voltage
    11 - 2.16 Rated power factor
    11 - 2.17 Rated output
    11 - 2.18 No-load input
    11 - 2.19 No-load output voltage
    11 - 2.20 Short-circuit voltage
    11 - 2.21 Power supply cord
    11 - 2.22 Detachable part
    11 - 2.23 Tool
    11 - 2.24 Basic insulation
    12 - 2.25 Supplementary insulation
    12 - 2.26 Double insulation
    12 - 2.27 Reinforced insulation
    12 - 2.28 Class I transformer
    12 - 2.29 Class II transformer
    12 - 2.30 Class III transformer
    12 - 2.31 Short-circuit proof transformer
    13 - 2.32 Non-inherently short-circuit proof transformer
    13 - 2.33 Inherently short-circuit proof transformer
    13 - 2.34 Fail-safe transformer
    13 - 2.35 Non-short-circuit proof transformer
    13 - 2.36 Portable transformer
    13 - 2.37 Hand-held transformer
    13 - 2.38 Stationary transformer
    13 - 2.39 All-pole disconnection
    13 - 2.40 Thermal cutout
    13 - 2.41 Self-resetting thermal cutout
    13 - 2.42 Non-self-resetting thermal cutout
    13 - 2.43 Overload release
    13 - 2.44 Body
    14 - 2.45 Accessible part
    14 - 2.46 Rated ambient temperature
    14 - 2.47 Clearance
    14 - 2.48 Creepage distance
    14 - 2.49 Working voltage
    14 - 2.50 Pollution
    14 - 2.51 Micro-environment
    14 - 2.52 Degree of pollution in the micro-environment
    14 - 2.53 Protective separation
    15 - 2.54 Protective screening
    15 - 3 GENERAL REQUIREMENTS
    15 - 3.1 Design and construction
    15 - 4 GENERAL NOTES ON TESTS
    15 - 4.1 Type of tests
    15 - 4.2 Sampling
    15 - 4.3 Order of tests
    15 - 4.4 Temperature
    15 - 4.5 Test voltages
    15 - 4.6 Position during tests
    16 - 4.7 Test measurements
    16 - 4.8 Transformers with a power supply cord
    16 - 4.9 Class I transformers with parts of Class II construction
    16 - 4.10 Flush-type transformers
    16 - 4.11 Transformers for specific use
    16 - 4.12 Associated transformers
    17 - 4.13 IP 00 transformers
    17 - 4.201 Electronic circuits associated with transformers
    17 - 5 RATING
    17 - 6 CLASSIFICATION
    17 - 6.1 Electric shock protection
    17 - 6.2 Short-circuit protection
    17 - 6.3 Enclosure protection
    17 - 6.4 Mobility
    17 - 7 MARKING
    17 - 7.1 General
    18 - 7.2 Transformers with IP 00 protection or associated transformers
    18 - 7.3 Transformers with adjustable supply voltages
    18 - 7.4 Transformers with tapped or multiple output windings
    19 - 7.5 Additional marking for short-circuit proof, non-short-circuit proof and fail-safe transformers
    19 - 7.6 Terminals
    19 - 7.7 Connection markings
    19 - 7.8 Transformers with Type X, Y, and Z attachments
    20 - 7.9 Symbols
    21 - 7.10 Switches and regulating devices
    21 - 7.11 Position of marking
    22 - 7.12 Legibility and durability
    22 - 8 PROTECTION AGAINST ELECTRIC SHOCK
    22 - 8.1 Construction and enclosure
    23 - 8.2 Prohibited connections
    23 - 8.3 Mechanical strength
    24 - 8.4 Shafts, handles, operating levers, knobs and the like
    24 - 8.5 Insulation
    24 - 8.6 Separation of input and output windings
    25 - 8.7 Prohibited use of capacitors
    25 - 9 CHANGE OF INPUT VOLTAGE SETTING
    26 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    26 - 10.1 Output voltage
    26 - 10.2 Confirmation of output markings
    26 - 11 NO-LOAD OUTPUT VOLTAGE
    26 - 12 SHORT-CIRCUIT VOLTAGE
    26 - 13 HEATING
    26 - 13.1 Temperature during normal use
    31 - 14 SHORT-CIRCUIT AND OVERLOAD PROTECTION
    31 - 14.1 General
    33 - 15 MECHANICAL STRENGTH
    33 - 15.1 General
    34 - 15.2 Impact test
    34 - 15.3 Drop test for portable transformers without integral pins
    34 - 15.4 Transformers with integral pins
    34 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    34 - 16.1 Enclosures
    35 - 16.2 Effects of humidity
    35 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    35 - 17.1 General
    37 - 18 CONSTRUCTION
    37 - 18.1 General
    37 - 18.2 Materials
    38 - 18.3 Permissible types
    38 - 18.4 Contact between accessible metal and conduits
    38 - 18.5 Removal and replacement of insulation
    38 - 18.6 Class I and Class II transformers
    39 - 18.7 Supplementary and reinforced insulation
    39 - 18.8 Separation of input and output terminals
    39 - 18.9 Fixing of handles, levers and the like
    39 - 18.10 Fixing of covers
    40 - 18.11 Transformers provided with pins
    40 - 18.12 Protection index
    40 - 18.13 Transformers with a particular protection index
    40 - 18.14 Class I transformers
    40 - 18.201 Output facilities
    41 - 19 COMPONENTS
    41 - 19.1 General
    41 - 19.2 Switches
    41 - 19.3 Socket-outlets
    41 - 19.4 Breaking capacity of thermal cutouts and overload releases
    42 - 19.5 Prohibition of self-resetting thermal cutouts
    42 - 19.6 Prohibited components
    42 - 19.7 Operation of overload protection devices
    42 - 19.201 Mounting of output protection
    42 - 20 INTERNAL WIRING
    42 - 20.1 Protection
    42 - 20.2 Openings
    42 - 20.3 Bare conductors
    42 - 20.4 Fixing of internal wiring
    42 - 20.5 Insulated conductors
    43 - 21 SUPPLY CONNECTION AND EXTERNAL FLEXIBLE CABLES AND CORDS
    43 - 21.1 Separate entries for input and output wiring
    43 - 21.2 Stationary transformers
    43 - 21.3 Portable transformers
    43 - 21.4 Cables and cords used for connections
    43 - 21.5 Cross-sectional area of power supply flexible cables and cords
    44 - 21.6 Fitting of plugs
    44 - 21.7 Power supply cord attachment
    48 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    48 - 22.1 Types of fixings
    48 - 22.2 Screws and nuts which clamp external conductors
    49 - 22.3 Compatibility between terminals and conductors
    49 - 22.4 Clamping arrangements for terminals for Type X attachment
    49 - 22.5 Clamping of conductors
    50 - 22.6 Grouping of terminals
    50 - 22.7 Terminal blocks and similar devices
    50 - 22.8 Terminals for Type X attachment
    50 - 22.9 Design and position of terminals
    50 - 22.10 Dimensions of pillar terminals
    51 - 22.11 Dimensions of screw terminals
    52 - 22.12 Dimensions of stud terminals
    53 - 22.13 Mechanical strength of terminals
    53 - 22.14 Prohibition of contact between terminals and accessible metal
    53 - 23 PROVISION FOR EARTHING
    53 - 23.1 General
    54 - 23.2 Design of earthing terminal
    54 - 23.3 Prevention of corrosion of earthing terminal
    54 - 23.4 Prohibition of earthing of socket-outlets
    54 - 23.5 Resistance of earthing connection
    55 - 24 SCREWS AND CONNECTIONS
    55 - 24.1 Mechanical strength
    56 - 24.2 Engagement of thread
    56 - 24.3 Contact pressure of electrical connections
    56 - 24.4 Space-threaded and thread-cutting screws
    57 - 24.5 Use of screws and rivets
    57 - 25 CREEPAGE DISTANCES, CLEARANCES AND DISTANCES THROUGH INSULATION
    57 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    57 - 26.1 Resistance of external parts of insulating material to heat
    57 - 26.2 Resistance of external parts of insulating material to fire
    61 - 26.3 Parts of insulating material retaining live parts in position
    62 - 26.4 Resistance of insulating material to abnormal heat
    62 - 26.5 Resistance to tracking
    62 - 27 RESISTANCE TO RUSTING
    63 - APPENDIX 1A - TESTS DURING PRODUCTION
    63 - 1A1 GENERAL
    63 - 1A2 EARTHING CONTINUITY TEST
    63 - 1A3 CHECKING OF NO-LOAD OUTPUT VOLTAGE AND NO-LOAD CURRENT
    63 - 1A4 ELECTRIC STRENGTH TEST
    63 - 1A5 CHECKING OF MOUNTING OF PROTECTIVE DEVICES
    64 - APPENDIX 1B - EXAMPLES OF CONSTRUCTION OF WINDINGS TO BE USED AS A GUIDE FOR CLAUSE 8.6
    64 - 1B1 COIL- FORMERS
    65 - 1B2 WINDINGS
    67 - APPENDIX IC - EXAMPLES OF POINTS OF APPLICATION OF TEST VOLTAGES
    69 - APPENDIX 1D - MEASUREMENT OF CREEPAGE DISTANCES AND CLEARANCES
    74 - APPENDIX 1E - EXAMPLES OF POINTS OF MEASUREMENT OF CREEPAGE DISTANCES AND CLEARANCES
    76 - CHAPTER 2 SUPPLEMENTARY REQUIREMENTS FOR ISOLATING TRANSFORMERS FOR GENERAL USE AND SHAVER TRANSFORMERS
    76 - INTRODUCTION
    76 - 1 SCOPE
    76 - 2 DEFINITIONS
    76 - 2.101 Shaver supply transformer
    76 - 2.102 Shaver supply unit
    76 - 3 GENERAL REQUIREMENTS
    76 - 4 GENERAL NOTES ON TESTS
    76 - 5 RATING
    76 - 5.101 Rated output voltage
    77 - 5.102 Rated output
    77 - 5.103 Rated input voltage
    77 - 6 CLASSIFICATION
    77 - 7 MARKING
    77 - 7.1 General
    77 - 7.9 Symbols
    77 - 7.11 Position of marking
    77 - 8 PROTECTION AGAINST ELECTRIC SHOCK
    77 - 8.1 Construction and enclosure
    78 - 8.2 Prohibited connections
    78 - 9 CHANGE OF INPUT VOLTAGE SETTING
    78 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    78 - 11 NO-LOAD OUTPUT VOLTAGE
    78 - 11.101 Maximum no-load voltage
    78 - 11.102 Difference between output voltages at no-load and at rated output
    78 - 12 SHORT- CIRCUIT VOLTAGE
    78 - 13 HEATING
    79 - 14 SHORT-CIRCUIT AND OVERLOAD PROTECTION
    79 - 14.1 General
    79 - 15 MECHANICAL STRENGTH
    79 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    79 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    79 - 18 CONSTRUCTION
    79 - 18.6 Class I and Class II transformers
    79 - 18.7 Supplementary and reinforced insulation
    79 - 18.101 Mounting boxes
    79 - 18.102 Output windings
    79 - 18.103 Separation of output windings and connection to socket- outlet
    79 - 18.104 Socket- outlets
    79 - 18.105 Replacement of non- self- resetting thermal cutouts
    80 - 19 COMPONENTS
    80 - 19.2 Switches
    80 - 19.5 Prohibition of self-resetting thermal cutouts
    80 - 20 INTERNAL WIRING
    80 - 21 SUPPLY CONNECTION AND EXTERNAL FLEXIBLE CABLES AND CORDS
    80 - 21.4 Cables and cords used for connections
    80 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    80 - 22.5 Clamping of conductors
    80 - 22.8 Terminals for Type X attachment
    81 - 23 PROVISION FOR EARTHING
    81 - 23.4 Prohibition of earthing of socket-outlets
    81 - 24 SCREWS AND CONNECTIONS
    81 - 25 CREEPAGE DISTANCES AND CLEARANCES AND DISTANCES THROUGH INSULATION
    81 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    81 - 27 RESISTANCE TO RUSTING
    82 - CHAPTER 3 SUPPLEMENTARY REQUIREMENTS FOR SAFETY ISOLATING TRANSFORMERS
    82 - INTRODUCTION
    83 - SECTION 1 SAFETY ISOLATING TRANSFORMERS FOR GENERAL USE
    83 - 1 SCOPE
    83 - 2 DEFINITIONS
    83 - 3 GENERAL REQUIREMENTS
    83 - 4 GENERAL NOTES ON TESTS
    83 - 5 RATING
    83 - 5.101 Rated output voltage
    83 - 5.102 Maximum rated output
    83 - 6 CLASSIFICATION
    83 - 7 MARKING
    83 - 7.101 Instruction sheet
    84 - 8 PROTECTION AGAINST ELECTRIC SHOCK
    84 - 8.1 Construction and enclosure
    84 - 9 CHANGE OF INPUT VOLTAGE SETTING
    84 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    84 - 11 NO-LOAD OUTPUT VOLTAGE
    84 - 11.101 Maximum no-load output voltage
    84 - 11.102 Difference between output voltage at no- load and at rated output
    85 - 12 SHORT-CIRCUIT VOLTAGE
    85 - 13 HEATING
    85 - 14 SHORT-CIRCUIT AND OVERLOAD PROTECTION
    85 - 15 MECHANICAL STRENGTH
    85 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    85 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    85 - 18 CONSTRUCTION
    85 - 18.6 Class I and Class II Transformers
    85 - 18.7 Supplementary and reinforced insulation
    85 - 19 COMPONENTS
    85 - 20 INTERNAL WIRING
    85 - 21 SUPPLY CONNECTION AND SUPPLY FLEXIBLE CABLES OR CORDS
    85 - 21.4 Cables and cords used for connections
    86 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    86 - 22.5 Clamping of conductors
    86 - 22.8 Terminals for Type X attachment
    86 - 23 PROVISION FOR EARTHING
    86 - 24 SCREWS AND CONNECTIONS
    86 - 25 CREEPAGE DISTANCES AND CLEARANCES AND DISTANCES THROUGH INSULATION
    86 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    86 - 27 RESISTANCE TO RUSTING
    87 - SECTION 2 TRANSFORMERS FOR TOYS
    87 - 1 SCOPE
    87 - 2 DEFINITIONS
    87 - 2.101 Transformer for toys
    87 - 3 GENERAL REQUIREMENTS
    87 - 4 GENERAL NOTES ON TESTS
    87 - 5 RATING
    87 - 5.101 Rated output voltage
    87 - 5.102 Rated output
    87 - 5.103 Rated supply voltage
    87 - 6 CLASSIFICATION
    87 - 7 MARKING
    87 - 7.1 General
    87 - 7.9 Symbols
    88 - 8 PROTECTION AGAINST ELECTRIC SHOCK
    88 - 8.1 Construction and enclosure
    88 - 8.1 Construction and enclosure
    88 - 9 CHANGE OF INPUT VOLTAGE SETTING
    88 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    88 - 11 NO-LOAD OUTPUT VOLTAGE
    88 - 11.101 Maximum no-load output voltage
    88 - 11.102 Difference between output voltage at no-load and at rated output
    88 - 12 SHORT-CIRCUIT VOLTAGE
    89 - 13 HEATING
    89 - 14 SHORT-CIRCUIT AND OVERLOAD PROTECTION
    89 - 14.1 General
    89 - 14.3 Non- inherently short-circuit proof transformers
    89 - 15 MECHANICAL STRENGTH
    90 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    90 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    90 - 18 CONSTRUCTION
    90 - 18.1 General
    90 - 18.6 Class II transformers
    90 - 18.7 Supplementary and reinforced insulation
    90 - 18.101 Transformers with a. c. terminals in the output circuit
    91 - 19 COMPONENTS
    91 - 19.3 Socket outlets
    91 - 19.4 Breaking capacity of thermal cut- outs and overload releases
    91 - 19.101 Non- self- resetting thermal cutouts and overload releases
    91 - 19.102 Control devices
    91 - 20 INTERNAL WIRING
    92 - 21 SUPPLY CONNECTION AND EXTERNAL FLEXIBLE CABLES AND CORDS
    92 - 21.4 Cables and cords used for connection
    92 - 21.5 Cross-sectional area of power supply flexible cables and cords
    92 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    92 - 22.5 Clamping of conductors
    92 - 22.8 Terminals for Type X attachment
    92 - 23 PROVISION FOR EARTHING
    92 - 24 SCREWS AND CONNECTIONS
    92 - 25 CREEPAGE DISTANCES AND CLEARANCES AND DISTANCES THROUGH INSULATION
    92 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    92 - 27 RESISTANCE TO RUSTING
    93 - SECTION 3 BELL TRANSFORMERS
    93 - 1 SCOPE
    93 - 2 DEFINITIONS
    93 - 2.101 Bell transformer
    93 - 3 GENERAL REQUIREMENTS
    93 - 4 GENERAL NOTES ON TESTS
    93 - 4.10 Flush-type transformers
    93 - 4.10 Flush-type transformers
    93 - 5 RATING
    93 - 5.101 Rated output voltage
    93 - 5.102 Rated output current
    93 - 5.103 Rated supply voltage
    93 - 5.104 Rated output power
    93 - 6 CLASSIFICATION
    94 - 6.2 Short-circuit protection
    94 - 6.101 Method of mounting
    94 - 7 MARKING
    94 - 7.1 General
    94 - 7.9 Symbols
    94 - 8 PROTECTION AGAINST ELECTRIC SHOCK
    94 - 8.1 Construction and enclosure
    94 - 8.201 Protection against contact with windings and live parts
    94 - 9 CHANGE OF INPUT VOLTAGE SETTING
    94 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    95 - 11 NO-LOAD OUTPUT VOLTAGE
    95 - 11.101 Maximum no-load output voltage
    95 - 11.102 Difference between output voltage at no- load and at rated output
    95 - 12 SHORT-CIRCUIT VOLTAGE
    95 - 13 HEATING
    96 - 14 SHORT-CIRCUIT AND OVERLOAD PROTECTION
    96 - 14.1 General
    96 - 14.1 General
    96 - 15 MECHANICAL STRENGTH
    96 - 15.2 Impact test
    96 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    96 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    96 - 18 CONSTRUCTION
    96 - 18.1 General
    96 - 18.1 General
    97 - 18.6 Class II transformers
    97 - 18.7 Supplementary and reinforced insulation
    97 - 18.13 Transformers with a particular protection index
    97 - 18.13 Transformers with a particular protection index
    97 - 18.101 Transformers mounted in consumer distribution boxes
    97 - 19 COMPONENTS
    97 - 19.2 Switches
    97 - 19.2 Switches
    97 - 19.4 Breaking capacity of thermal cutouts and overload releases
    97 - 19.4 Breaking capacity of thermal cutouts and overload releases
    98 - 19.5 Prohibition of self-resetting thermal cutouts
    98 - 20 INTERNAL WIRING
    98 - 21 SUPPLY CONNECTION AND EXTERNAL FLEXIBLE CABLES AND CORDS
    98 - 21.1 Separate entries for input and output wiring
    98 - 21.4 Cables and cords used for connection
    99 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    99 - 22.5 Clamping of conductors
    99 - 22.8 Terminals for Type X attachment
    99 - 23 PROVISION FOR EARTHING
    99 - 24 SCREWS AND CONNECTIONS
    99 - 24.2 Engagement of thread
    99 - 25 CREEPAGE DISTANCES AND CLEARANCES AND DISTANCES THROUGH INSULATION
    99 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    99 - 27 RESISTANCE TO RUSTING
    100 - SECTION 4 TRANSFORMERS FOR CLASS III HANDLAMPS
    100 - 1 SCOPE
    100 - 2 DEFINITIONS
    100 - 2.101 Transformers for Class III handlamps
    100 - 3 GENERAL REQUIREMENTS
    100 - 4 GENERAL NOTES ON TESTS
    100 - 5 RATING
    100 - 5.101 Rated output voltage
    100 - 6 CLASSIFICATION
    100 - 7 MARKING
    100 - 7.1 General
    100 - 7.9 Symbols
    101 - 8 PROTECTION AGAINST ELECTRICAL SHOCK
    101 - 8.1 Construction and enclosure
    101 - 9 CHANGE OF INPUT VOLTAGE SETTING
    101 - 10 OUTPUT VOLTAGE AND OUTPUT CURRENT UNDER LOAD
    101 - 11 NO-LOAD OUTPUT VOLTAGE
    101 - 11.101 Maximum no- load output voltage
    101 - 11.102 Difference between output voltage at no- load and the voltage at half the rated output
    101 - 12 SHORT- CIRCUIT VOLTAGE
    101 - 13 HEATING
    102 - 14 SHORT- CIRCUIT AND OVERLOAD PROTECTION
    102 - 15 MECHANICAL STRENGTH
    102 - 16 PROTECTION AGAINST HARMFUL INGRESS OF WATER AND MOISTURE
    102 - 17 INSULATION RESISTANCE AND ELECTRIC STRENGTH
    102 - 18 CONSTRUCTION
    102 - 18.6 Class II transformers
    102 - 18.7 Supplementary and reinforced insulation
    102 - 19 COMPONENTS
    102 - 20 INTERNAL WIRING
    102 - 21 SUPPLY CONNECTION AND EXTERNAL FLEXIBLE CABLES AND CORDS
    102 - 21.4 Cables and cords used for connections
    103 - 22 TERMINALS FOR EXTERNAL CONDUCTORS
    103 - 22.5 Clamping of conductors
    103 - 22.8 Terminals for Type X attachment
    103 - 23 PROVISION FOR EARTHING
    103 - 24 SCREWS AND CONNECTIONS
    103 - 25 CREEPAGE DISTANCES AND CLEARANCES DISTANCES THROUGH INSULATION
    103 - 26 RESISTANCE TO HEAT, ABNORMAL HEAT, FIRE AND TRACKING
    103 - 27 RESISTANCE TO RUSTING
    110 - ANNEX A - VARIANT TO CLAUSE 22, TERMINALS FOR EXTERNAL CONDUCTORS
    110 - 22.3 Compatibility between terminals and conductors
    110 - 22.10 Dimensions of pillar terminals
    111 - 22.11 Dimensions of screw terminals
    111 - 22.12 Dimensions of stud terminals
    111 - 22.13 Mechanical strength of terminals
    116 - ANNEX B - LIST OF VARIATIONS BETWEEN THIS STANDARD AND IEC 742:1983

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    Specifies essential safety requirements for approval and test purposes. It contains general requirements and particular requirements for specific transformers.

    Scope - (Show below) - (Hide below)

    This Standard is applicable to stationary or portable, single-phase or polyphase, air cooled isolating and safety isolating transformers, associated or otherwise, having a rated supply voltage not exceeding 1000 V a.c. and rated frequency not exceeding 500 Hz, the rated output not exceeding:(a) For isolating transformers: (i) 25 kV.A for single-phase transformers. (ii) 40 kV.A for polyphase transformers.(b) For safety isolating transformers: (i) 10 kV.A for single-phase transformers. (ii) 16 kV.A for polyphase transformers.The no-load and rated output voltages do not exceed:(A) For isolating transformers, 1000 V a.c. and 1000 +2 V unsmoothed d.c.(B) For safety isolating transformers, 50 V a.c. r.m.s., or 120 V ripple free d.c. between conductors or between any conductor and earth.Rated values, appropriate to each type of transformer, are indicated in Chapter 2 and Chapter 3.NOTES:This Standard is applicable to those isolating transformers used when the installation rules call for the separation of circuits for the supply of equipment (for example, shavers, portable tools and lawn mowers) or of certain parts of the circuit. This Standard is applicable to safety isolating transformers used for the supply of circuits for safety extra-low voltage equipment (for example, toys, bells, portable tools and handlamps). This Standard applies to transformers associated with specific items of equipment, to the extent indicated by other Australian or Australian/New Zealand Standards. This Standard is applicable to dry type or encapsulated transformers. It is not applicable to transformers filled with oil, sand or similar substances. In locations where special environmental conditions prevail, particular requirements may be necessary in accordance with AS 3000 in Australia and with the Electricity Regulations in New Zealand.

    History - (Show below) - (Hide below)

    Amendment 4 to AS/NZS 3108:1994 see DR 96129. Amendment 5 DR AS/NZS 3108:1994 see DR 96299. Amendment 7 to DR 98259 CP. Under Revision see DR 99483 CP. Under Revision see DR 00915 AS 3108 first published in Australia in part as AS C126-1939.Second edition 1958.AS C167 first published 1962.Revised and redesignated AS 3167-1981 (withdrawn 1987).AS C126-1958 revised and redesignated AS 3126-1981 (withdrawn 1989).AS 3126-1981 and AS 3167-1981 revised and redesignated AS 3108.1-1984, AS 3108.2-1984 and AS 3108.3-1984.Revised, amalgamated and redesignated AS 3108-1990.First published in New Zealand as NZS/AS 3108:1990.Jointly revised and designated as Joint Standard AS/NZS 3108:1994. AS 3108 first published in Australia in part as AS C126-1939. Second edition 1958. AS C167 first published 1962. Revised and redesignated AS 3167-1981 (withdrawn 1987). AS C126-1958 revised and redesignated AS 3126-1981 (withdrawn 1989). AS 3126-1981 and AS 3167-1981 revised and redesignated AS 3108.1-1984, AS 3108.2-1984 and AS 3108.3-1984. Revised, amalgamated and redesignated AS 3108-1990. First published in New Zealand as NZS/AS 3108:1990. Jointly revised and designated as Joint Standard AS/NZS 3108:1994.

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

    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/NZS 3112:1993 Approval and test specification - Plugs and socket-outlets
    AS 2768-1985 Electrical insulating materials - Evaluation and classification based on thermal endurance
    AS 3000-1986 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules)
    AS 3109.1-1987 Approval and test specification - Appliance couplers for household and similar general purposes - General requirements
    AS 1621.1-1988 Pressure-sensitive adhesive electrical tapes - General requirements
    AS/NZS 3112:2004 Approval and test specification - Plugs and socket-outlets
    AS 1042-1973 Direct-acting indicating electrical measuring instruments and their accessories
    AS 1939-1990 Degrees of protection provided by enclosures for electrical equipment (IP Code)
    AS 3250-1990 Approval and test specification - Mains operated electronic and related equipment for household and similar general use
    AS/NZS 3194:1993 Approval and test specification - Electric shaver supply units
    AS/NZS 3123:2005 Approval and test specification - Plugs, socket-outlets and couplers for general industrial application
    AS 1852.00-1980 International electrotechnical vocabulary - General index
    AS 2420-1987 Fire test methods for solid insulating materials and non-metallic enclosures used in electrical equipment
    AS/NZS 3250:1995 Approval and test specification - Mains operated electronic and related equipment for household and similar general use
    AS/NZS 3120:1999 Approval and test specification - Cord extension sockets
    AS 1099.2BD-1980 Basic environmental testing procedures for electrotechnology Tests - Test Bd - Dry heat test for heat-dissipating specimens with gradual change of temperature
    AS 3123-1987 Approval and test specification - Plugs, socket-outlets and couplers for general industrial application

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

    AS/NZS 3100:1997 Approval and test specification - General requirements for electrical equipment
    AS 3304-1995 Approval and test specification - Particular requirements for skin or hair care appliances
    AS/NZS 4510:1999 Isolated electrical supply systems for medical use (Reconfirmed 2016)
    AS/NZS 3018:2001 Electrical installations - Domestic installations
    AS/NZS 2081.2:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-continuity monitoring devices
    AS 2865-1995 Safe working in a confined space
    AS 2832.5-2002 Cathodic protection of metals - Steel in concrete structures
    AS/NZS 60598.2.23:2002 Luminaires Particular requirements - Extra low voltage lighting systems for filament lamps (IEC 60598.2.23:1996, MOD) (Reconfirmed 2016)
    AS 3136-1996 Approval and test specification - Electrical equipment for spa-baths and spa and swimming pools
    AS/NZS 2832.1:1998 Cathodic protection of metals - Pipes and cables
    AS 4191-1994 Portable traffic signal systems
    AS/NZS 2243.1:1997 Safety in laboratories - General
    AS/NZS 2081.3:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Earth-leakage protection systems for use on earth-fault current limited systems (IT systems)
    AS/NZS 3350.1:2000 Safety of household and similar electrical appliances General requirements (IEC 60335-1:1994 MOD)
    AS 2832.1-2004 Cathodic protection of metals - Pipes and cables
    AS/NZS 4836:2001 Safe working on low-voltage electrical installations
    AS/NZS 3018:1997 Electrical installations - Domestic installations
    AS/NZS 3003:1999 Electrical installations - Patient treatment areas of hospitals and medical and dental practices
    AS/NZS 3194:1993 Approval and test specification - Electric shaver supply units
    AS 1418.1-2002 Cranes, hoists and winches General requirements
    AS/NZS 3172:1996 Approval and test specification - Electric cooking appliances for household use
    AS/NZS 3172:1996 Approval and test specification - Electric cooking appliances for household use
    AS/NZS 3003:2003 Electrical installations - Patient treatment areas of hospitals and medical, dental practices and dialyzing locations
    AS 4428.0-1997 Fire detection, warning, control and intercom systems - Control and indicating equipment - General requirements and test methods
    AS/NZS 60598.2.6:1998 Luminaires Particular requirements - Luminaires with built-in transformers or convertors for filament lamps (Reconfirmed 2013)
    AS/NZS 3002:2002 Electrical installations - Shows and carnivals
    AS 62103-2006 Electronic equipment for use in power installations
    AS/NZS 3130:1995 Approval and test specification - Beauty therapy equipment
    AS/NZS 4386.1:1996 Domestic kitchen assemblies Kitchen units
    AS 4991-2004 Lifting devices
    AS/NZS 2243.1:2005 Safety in laboratories Planning and operational aspects
    AS 3533.1-1997 Amusement rides and devices - Design and construction
    AS 3181-1995 Approval and test specification - Electrically operated projectors for household and similar use
    AS 3894.2-2002 Site testing of protective coatings Non-conductive coatings - Continuity testing - Wet sponge method
    AS/NZS 2865:2001 Safe working in a confined space
    AS 60204.1-2005 Safety of machinery - Electrical equipment of machines General requirements (IEC 60204-1, Ed. 5 (FDIS) MOD)
    AS/NZS 3250:1995 Approval and test specification - Mains operated electronic and related equipment for household and similar general use
    AS 3193-1995 Approval and test specification - Transformer type battery chargers
    AS/NZS 3160:1996 Approval and test specification - Hand-held portable electric tools
    AS/NZS 61046:2001 Auxiliaries for lamps - D.C. or A.C. supplied electronic step-down convertors for filament lamps - General and safety requirements (IEC 61046:1993, MOD)
    AS 3439.4-1995 Low-voltage switchgear and controlgear assemblies - Particular requirements for assemblies for construction sites (ACS)
    AS/NZS 3947.5.3:2000 Low-voltage switchgear and controlgear Control circuit devices and switching elements - Requirements for proximity devices with define behaviour under fault conditions
    AS/NZS 7450.1:1999 Safety of hand-held motor-operated electric tools General requirements
    AS/NZS 3004:2002 Electrical installations - Marinas and pleasure craft at low-voltage
    AS/NZS 3012:2003 Electrical installations - Construction and demolition sites
    AS/NZS 3164:1994 Approval and test specification - Safety of electrically heated blankets, pads and similar flexible heating appliances for household use
    AS 3100-1994 Approval and test specification - General requirements for electrical equipment
    AS/NZS 3160:2001 Approval and test specification - Hand-held portable electric tools
    AS 2832.2-2003 Cathodic protection of metals Compact buried structures
    AS 1735.5-2003 Lifts, escalators and moving walks Lifts, escalators and moving walks
    AS/NZS 60598.1:1998 Luminaires General requirements and tests
    AS 4024.3-1998 Safeguarding of machinery Manufacturing and testing requirements for electro-sensitive systems - Optoelectronic devices
    AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS/NZS 3012:1995 Electrical installations - Construction and demolition sites
    AS 1966.3-1990 Electric arc welding power sources - Plasma arc cutting and welding types
    AS/NZS 60598.1:2003 Luminaires General requirements and tests (IEC 60598-1:2003, MOD)
    AS/NZS 3128:1998 Approval and test specification - Portable lamp standards and brackets
    AS 1418.6-2004 Cranes, hoists and winches Guided storing and retrieving appliances (Reconfirmed 2018)
    AS/NZS 2081.4:2002 Electrical equipment for coal and shale mines - Electrical protection devices - Lockout earth-fault protection devices
    AS/NZS 2144:2002 Traffic signal lanterns
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