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As NZS 61558.2.6-2009 (IEC TEXT) Safety of Power Transformers Power Supplies Reactors and Similar Products Fo | Transformer | Power Supply
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(IEC TEXT)
Safety of power transformers, power supplies, reactors and similar products for supply voltages up to 1 100 V Part 2.6: Particular requirements for safety isolating transformers and power supply units incorporating safety isolating transformers (IEC 61558-2-6 Ed 2, MOD)
AS/NZS 61558.2.6:2009 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL-002, Safety of Household and Similar Electrical Appliances and Small Power Transformers. It was approved on behalf of the Council of Standards Australia on 9 September 2009 and on behalf of the Council of Standards New Zealand on 28 August 2009. This Standard was published on 30 October 2009.
This Standard was issued in draft form for comment as DR 09912.
Originated, in part, in Australia as AS C1261939. Second edition C1261958. Revised and redesignated AS 31261981 (withdrawn 1989). Originated, in part, in Australia as AS C1671962. Revised and redesignated AS 31671981 (withdrawn 1987) AS 31261981 and AS 31671981 were revised and redesignated AS 3108.11984, AS 3108.21984 and AS 3108.31984. Revised, amalgamated and redesignated AS 31081990. Originated in New Zealand as NZS 1379:1960. Final New Zealand edition NZS/AS 3108:1990. Jointly revised and redesignated AS/NZS 3108:1994. Jointly revised and redesignated, in part, as AS/NZS 61558.2.6:2001. Jointly revised and redesignated, as AS/NZS 61558.2.6:2009.
ISBN 0 7337 9257 X
AS/NZS 61558.2.6:2009 Safety of power transformers, power supplies, reactors and similar products for supply voltages up to 1 100 V Part 2.6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers
This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL002 - Safety of Household and Similar Electrical Appliances and Small Power Transformers. It replaces AS/NZS 61558.2.6:2001 and its amendments three years from the date of its 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 safety isolating transformers and power supply units incorporating safety isolating transformers which can form the basis for approval by regulatory authorities. The text of IEC 61558-2-6 Ed 2, prepared by IEC Technical Committee 96, was submitted to the Standards Australia/Standards New Zealand Combined Procedure (dual public comment and committee vote) for adoption of the IEC standard as a Standards Australia/Standards New Zealand joint standard. This Standard is an adoption with national modifications of the second edition of IEC 61558-26:2009, Safety of power transformers, power supplies, reactors and similar products for supply voltages up to 1 100 V Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers. It has been varied as indicated to take account of Australian and New Zealand conditions. In this version, the text of IEC 61558-2-6 Ed 2 is included in full. Variations to take account of Australian and New Zealand conditions follow the IEC text. This part 2 has to be used in conjunction with the latest edition of AS/NZS 61558.1 Safety of Power Transformers, Power Supplies, Reactors and Similar Products Part 1: General requirements and tests and its amendments. It was established on the basis of the 2008 edition of that standard. Amendments and revisions of Part 1 have also to be taken into account and the dates when such changes become applicable will be stated in the relevant amendment or revision of Part 1. 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 safety isolating transformers and power supply units incorporating safety isolating transformers. When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as far as is reasonable. When this standard states "addition", "modification" or "replacement", the relevant text of Part 1 is to be adapted accordingly.
subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including those in a replaced clause or subclause; additional annexes are lettered AA, BB, etc.; subclauses, notes and annexes that are additional to those in the IEC standard are prefixed with the letters AZ. The following print types are used:
The essential safety requirements in AS/NZS 3820 1 that could be applicable to safety isolating transformers and power supply units incorporating safety isolating transformers are covered by this standard. The national variations to IEC 61558-2-6 Ed 2 form the Australian and New Zealand national variations for purposes of the IECEE scheme for recognition of results of testing to standards for safety of electrical equipment (the CB scheme). There are national variations from the IEC Standard from which this standard is adopted, other than those listed in Annex ZZ to AS/NZS 61558.1.
61558-2-6 IEC:2009
FOREWORD.........................................................................................................................2 1 2 3 4 5 6 7 8
Scope ............................................................................................................................4 Normative references .....................................................................................................5 Terms and definitions .....................................................................................................5 General requirements .....................................................................................................5 General notes on tests....................................................................................................5 Ratings ..........................................................................................................................5 Classification ..................................................................................................................6 Marking and other information.........................................................................................6 Protection against electric shock .....................................................................................6
10 Change of input voltage setting .......................................................................................6 11 Output voltage and output current under load ..................................................................6 12 No-load output voltage....................................................................................................6 13 Short-circuit voltage........................................................................................................7 14 Heating ..........................................................................................................................7 15 Short-circuit and overload protection ...............................................................................7 16 Mechanical strength .......................................................................................................8 17 Protection against harmful ingress of dust, solid objects and moisture .............................8 18 Insulation resistance, dielectric strength and leakage current ..........................................8 19 Construction ...................................................................................................................8 20 Components .................................................................................................................10 21 Internal wiring...............................................................................................................10 22 Supply connection and other external flexible cable or cords .........................................10 23 Terminals for external conductors .................................................................................10 24 Provisions for protective earthing ..................................................................................10 25 Screws and connections ...............................................................................................10 26 Creepage distances, clearances and distances through insulation .................................11 27 Resistance to heat, fire and tracking .............................................................................11 28 Resistance to rusting ....................................................................................................11 Annexes .............................................................................................................................12 Annex C Creepage distances (cr), clearances (cl) and distances through insulation (dti) Material group II (400 CTI <600).................................................................................12 Annex D Creepage distances (cr), clearances (cl) and distances through insulation (dti) Material group I (CTI 600) ..........................................................................................12 Annex R Explanations of the application of 4.2 of IEC 60664-1:2007 (see IEC 61558-1 Subclause 26.2)..................................................................................................................12 Bibliography .......................................................................................................................13 Table 101 Output voltage difference ...................................................................................7
INTERNATIONAL ELECTROTECHNICAL COMMISSION ___________ SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND SIMILAR PRODUCTS FOR SUPPLY VOLTAGES UP TO 1 100 V Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers
International standard IEC 61558-2-6 has been prepared by IEC technical committee 96: Transformers, reactors, power supply units and similar products for low voltages up to 1 100 V. This second edition cancels and replaces the first edition published in 1997. It constitutes a technical revision. The main changes consist of updating this part in accordance with Part 1 (2005), and increasing the supply voltages up to 1 100 V to be in line with the standards of TC 14. This part has the status of a group safety publication in accordance with IEC Guide 104: (1997): The preparation of safety publications and the use of basic safety publications and group safety publications.
3 The text of this standard is based on the following documents:
FDIS 96/317/FDIS Report on voting 96/322/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its amendments. It is based on the second edition (2005) of that standard.
This part supplements or modifies the corresponding clauses in IEC 61558-1, so as to convert that publication into the IEC standard: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers. A list of all parts of the IEC 61558 series can be found on the IEC website under the title: Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as far as is reasonable. Where this part states "addition", "modification" or "replacement", the relevant text of Part 1 is to be adapted accordingly. In this part, the following print types are used: requirements proper: in roman type; test specifications: in italic type;
explanatory matter: in smaller roman type:
In the text of this part, the words in bold are defined in Clause 3. Subclauses, notes, figures and tables additional to those in Part 1 are numbered starting from 101; supplementary annexes are entitled AA, BB, etc. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may need a transitional period following publication of a new, amended or revised IEC publication in which to make products in accordance with the new requirements and to equip themselves for conducting new or revised tests. It is the recommendation of the committee that the content of this publication be adopted for implementation nationally not earlier than 12 months from the date of publication.
Unless otherwise specified, from here onward, the term transformer covers safety isolating transformers for general applications and power supply units incorporating safety isolating transformers for general applications.
This part is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings may be encapsulated or non-encapsulated. The rated supply voltage does not exceed 1 100 V a.c., and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz. The rated output does not exceed: 10 kVA for single-phase transformers; 16 kVA for polyphase transformers.
The no-load output voltage or the rated output voltage does not exceed 50 V a.c. or 120 V ripple-free d.c. This part is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers. Transformers covered by this part are used in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard.
AS/NZS 61558.2.6:2009 (IEC TEXT), Safety of power transformers, power supplies, reactors and similar products for supply voltages up to 1 100 V Particular requirements for safety isolating transformers and power supply units incorporating safety isolating transformers(IEC 61558-2-6 Ed 2, MOD)
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