AS NZS 61558.2.7-2001 Safety of power transformers, power supply units and similar.pdf

AS/NZS 61558.2.7:2001 Australian/New Zealand Standard Safety of power transformers, power supply units and similar Part 2.7: Particular requirements for transformers for toys (IEC 61558-2-7:1997, MOD) AS/NZS 61558.2.7 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 AS/NZS 61558.2.7:2001 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL/2 - Safety of household and similar electrical appliances and small power transformers. It was approved on behalf of the Council of Standards Australia on 2 October 2001 and on behalf of the Council of Standards New Zealand on 12 October 2001. It was published on 12 November 2001. The following interests are represented on Committee EL/2: Association of Certification Bodies Australian Chamber of Commerce and Industry Australian Electrical and Electronic Manufacturers Association Canterbury Manufacturers Association New Zealand Consumer Electronic Suppliers Association, Australia Electrical regulatory authorities, Australia Electrical test laboratories Electrical consultants Electricity Supply Association of Australia Institution of Engineers Australia Metal Trades Industries Association of Australia Ministry of Consumer Affairs, New Zealand Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. 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We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia International or Standards New Zealand at the address shown on the back cover. This Standard was issued in draft form for comment as DR 01944. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 AS/NZS 61558.2.7:2001 (IEC 61558-2-7:1997, MOD) Australian/New Zealand Standard Safety of power transformers, power supply units and similar - Part 2.7: Particular requirements for transformers for toys (IEC 61558-2-7:1997, MOD) Originated, in part, in Australia as AS C126-1939 Second edition C126 1958 Revised and redesignated AS 3126 1981 (withdrawn 1989) Originated, in part, in Australia as AS C167-1962 Revised and redesignated AS 3167 1981 (withdrawn 1987) AS 3126 1981 and AS 3167 1981 were revised and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 redesignated AS/NZS 3108:1994 Jointly revised and redesignated, in part, as AS/NZS 61558.2.7:2001 COPYRIGHT © Standards Australia/ Standards New Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher Published jointly by Standards Australia International Ltd GPO Box 5420,Sydney, NSW 2001 Australia, and Standards New Zealand Private Bag 2439,Wellington 6020, New Zealand ISBN 0 7337 4422 2 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 2 COPYRIGHT CONTENTS Page PREFACE.3 Clause 1Scope.5 2Normative references .5 3Definitions 5 4General requirements.5 5General notes on tests .5 6Ratings.5 7Classification6 8Marking and other information 6 9Protection against accessibility to hazardous live parts.7 10Change of input voltage setting 7 11Output voltage and output current under load.7 12No-load output voltage .8 13Short-circuit voltage .8 14Heating.8 15Short-circuit and overload protection 8 16Mechanical strength .9 17Protection against harmful ingress of dust, solid objects and moisture10 18Insulation resistance and electric strength10 19Construction.10 20Components.11 21Internal wiring.12 22Supply connection and other external flexible cable or cords12 23Terminals for external conductors.13 24Provision for protective earthing .13 25Screws and connections.13 26Creepage distances, clearances, and distances through insulation.13 27Resistance to heat, abnormal heat, fire and tracking 13 28Resistance to rusting13 Annexes .16 Annex C Material group II 16 Annex D Material group I .16 Annex ZZ (informative) Variations to IEC 61558-2-7:1997 for application in Australia and New Zealand17 Figure 101 Small test finger .14 Figure 102 - Arrangement for impact test for transformers for toys15 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 3 COPYRIGHT PREFACE This standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL-002- Safety of Household and Similar Electrical Appliances and Small Power Transformers, to supersede, AS/NZS 3108, Chapter 3, Section 2, two years from publication. The objective of this Standard is to provide manufacturers, designers, regulatory authorities, testing laboratories and similar organizations with safety requirements for the design, manufacture and testing of transformers for toys which can form the basis for approval by regulatory authorities. This Standard forms the first edition of AS/NZS 61558.2.7 Safety of power transformers, power supply units and similar - Part 2.7: Particular requirements for transformers for toys. This Standard is an adoption with national modifications and contains the full text of the first edition of IEC 61558-2-7:1997, Safety of power transformers, power supply units and similar - Part 2-7: Particular requirements for transformers for toys and has been varied as indicated to take account of Australian and New Zealand conditions. It is to be used in conjunction with the latest edition of AS/NZS 61558.1 and its amendments. It was established on the basis of the first edition (2000) of that standard. This part 2 supplements or modifies the corresponding clauses of AS/NZS 61558.1 so as to convert it into the Australian/New Zealand Standard: Safety requirements for transformers for toys. Where a particular subclause of part 1 is not mentioned in this part 2, that subclause applies as far as is reasonable. Where this Standard states “addition“, “modification“ or “replacement“, the relevant text in part 1 is to be adapted accordingly. NOTE 1 Subclauses, notes, tables and figures which are additional to those in part 1 are numbered starting from 101. Annexes, which are additional to those in part 1 are lettered AA, BB, etc. Annex ZZ is for information only. NOTE 2 In this Standard the following print types are used: requirements: in arial type; test specifications: in italic type; notes: in small arial type; Words in bold in the text are defined in clause 3. The numbering of clauses, subclauses, notes, tables, figures and annexes follows that of IEC 61558-2-7:1997. To allow for the introduction of additional material by the IEC, the numbers 101 to 200 have been reserved. To allow for additional material to be introduced by Australia and New Zealand, the numbers 201 to 300 are used to number further clauses, subclauses, notes, tables and figures in part 1. The numbers 301 to 400 are used to number further clauses, subclauses, notes, tables and figures in this part 2. Additional annexes are lettered ZA, ZB and so on. This scheme has been introduced to reduce the likelihood of the IEC and Australia and New Zealand using the same identifier for different purposes. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 4 COPYRIGHT As this Standard is reproduced from an International Standard, the following applies: (a) Its number does not appear on each page of text and its identity is shown on the cover and title page only. (b) In the source text “this International Standard“ should read “this Australian/New Zealand Standard“. (c) A full point substitutes for a comma when referring to a decimal marker. Variations to IEC 61558-2-7:1997 are indicated at the appropriate places throughout this standard. Strikethrough (example) identifies IEC tables, figures and passages of text which, for the purposes of this Australian/New Zealand standard are deleted. Where Australian/New Zealand tables, figures or passages of text are added, each is set in its proper place and identified by shading (example). Added figures are not themselves shaded, but are identified by a shaded border. Variations made to IEC 61558-2-7:1997 form the Australian variations for the purposes of the IECEE scheme for recognition of testing to standards for safety of electrical equipment (the CB scheme). These variations have been incorporated in the body of the standard. They are listed in Annex ZZ for easy reference. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 5 COPYRIGHT AUSTRALIA/NEW ZEALAND STANDARD SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR Part 2.7: Particular requirements for transformers for toys (IEC 61558-2-7:1997, MOD) 1 Scope Replacement: This part 2 of IEC 61558 AS/NZS 61558 applies to transformers for toys having a rated supply voltage not exceeding 250 V a.c., a rated frequency of 50/60 Hz, a rated output voltage not exceeding 24 V a.c. or 33 V ripple-free d.c. and a rated output not exceeding 200 VA and a rated output current not exceeding 10 A. This standard does not in general take into account playing with the transformer by children. 2 Normative references This clause of part 1 is applicable. This clause of part 1 is applicable except as follows: Addition: AS/NZS 3112:2000, Approval and test specification Plugs and socket-outlets 3 Definitions This clause of part 1 is applicable except as follows: Addition: 3.1.101 transformer for toys safety isolating transformer designed to supply toys and having a rated output voltage not exceeding 24 V a.c. or 33 V ripple-free d.c. 4 General requirements This clause of part 1 is applicable. 5 General notes on tests This clause of part 1 is applicable except as follows: 5.12 This subclause is not applicable. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 6 COPYRIGHT 6 Ratings This clause of part 1 is applicable except as follows: Addition: 6.101 The rated output voltage shall not exceed 24 V a.c. or 33 V ripple-free d.c. Preferred values are: 1,5 V; 3 V; 4,5 V; 6 V; 9 V; 12 V and 24 V. 6.102Transformers for toys shall have only one rated supply voltage not exceeding 250 V. 6.103 The rated output shall not exceed 200 VA. 6.104 The rated output current shall not exceed 10 A. 7 Classification This clause of part 1 is applicable except as follows: 7.1Replacement: According to their protection against electric shock: Transformers for toys shall be of class II construction 7.2Replacement: According to short-circuit protection or protection against abnormal use: inherently short-circuit-proof transformers; non-inherently short-circuit-proof transformers; fail-safe transformers. 7.4Replacement: According to their mobility: portable transformers; stationary transformers. 7.5Replacement: According to their time of operation: Transformers for toys shall be designed for continuous operation. 8 Marking and other information This clause of part 1 is applicable except as follows: Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 7 COPYRIGHT 8.1Modification: n) transformers suitable for outdoor use shall be marked with the appropriate IP degree. 8.11Addition: The following symbol shall be used (IEC 60417 standard sheet 60417 IEC 5219) for transformers for toys. 9 Protection against accessibility to hazardous live parts This clause of part 1 is applicable except as follows: 9.2Modification: The standard test finger of figure 2 is replaced by the small test finger of figure 101. 9.2Addition: It shall not be possible to gain access to live parts of the input circuit, or to metal parts separated from live parts by basic insulation only, even after the removal of covers, which can be removed with the aid of a tool. 10 Change of input voltage setting This clause of part 1 is applicable except as follows: Replacement: Transformers for toys shall have only one rated supply voltage or one rated supply voltage range. Compliance is checked by inspection. 11 Output voltage and output current under load This clause of part 1 is applicable except as follows: 11.1Modification: When the transformer is connected to rated supply voltage, at rated frequency and loaded with an impedance which would give rated output at rated output voltage and, for a.c. rated power factor, the output voltage shall not differ from the rated value by more than 10 % for a.c. or 15 % for d.c. This requirement is applicable to all output windings and their tapping. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 22 Jun 2007 8 COPYRIGHT 12 No-load output voltage This clause of part 1 is applicable except as follows: Addition: 12.101 The no-load output voltage shall not exceed 33 V a.c. or 46 V ripple-free d.c, under any circumstance even if all independent windings are connected in series. 12.102 The difference between the output voltage at no-load and rated output (measured during the test of clause 11) expressed as a percentage of the latter voltage, shall not exceed 100 %. 13 Short-circuit voltage The clause of part 1 is not applicable. 14 Heating This clause of part 1 is applicable. 15 Short-circuit and overload protection This clause of part 1 is applicable except as follows: 15.1Addition: Transformers for toys shall be of either short-circuit-proof or fail-safe construction. Short- circuit-proof transformers shall withstand overload which may occur in normal use. They shall not incorporate fuses. If the short-circuit output current exceeds 20 A, a non-self-resetting overload release shall be incorporated. Non-self-resetting overload releases, if any, shall be incorporated in the input circuit. Table 3 Modification: External enclosures (which may be touched with the small test finger of figure 101) if of: metal50 °C other material60 °C Addition: 15.3.101Transformers for toys with a short-circuit current exceeding 20 A, are connected in the cold condition, to rated supply voltage and t