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1、BS 3535 : Part 1 : 1990 EN 60 742 : 1989 UDC621.314.21 : 614.8 British Standard Isolating transformers and safety isolating transformers Part 1. General requirements This European Ctandard EN 60 742 has the status of a British Standard. - - o U- British Standards NO COPYING WITHOUT BSI PERMISSION EX
2、CEPT AS PERMITTED BY COPYRIGHT LAW BS 3535 : Part 1 : 1990 Contents Page National foreword Inside front cover Text of EN 60 742 1 National appendix A Inside back cover National appendix B Inside back cover Cooperating organizations Back cover National foreword This Part of BS 3535 has been prepared
3、under the direction of the Power Electrical Engineering Standards Policy Com- mittee and is the English language version of EN 60 742 Isolating transformers and safety isolating transformers require- ments, published by the European Committee for Electrotechnical Standardization (CENELEC). It was de
4、rived by that organization from IEC Publication 742 : 1983 which has the same title as that of the European Standard. This British Standard is Part 1 of the revision of BS 3535 : 1962 in two Parts. Part 2, which is published concurrently with Part 1, is the nationally produced standard on Isolating
5、Transformers for reduced system voltage. This Part of BS 3535 together with BS 3535 : Part 2 supersedes BS 3535 : 1962, BS 3052 : 1958 and BS 4435 : Part 1 : 1969 which are withdrawn. On page 2 of EN 60 742 under the heading Brief history. reference is made to common modifications. For the sake of c
6、larity. these have been incorporated at the appropriate places in the text of JEC 742 (1983): they are marked by a vertical line in the margin. The relevant parts of the original IEC text have been quoted as INFORMATION directly after the text of the common modifications. Attention is drawn to the f
7、act that the page numbers quoted in the text of EN 60 732, in relation to figures, are the page numbers of IEC Publication 742. These page references do not therefore correspond to the EN page numbers as shown in the shoulder heading ofeach page; all the relevant figures ma); be found by consulting
8、the contents list on EN page 4. Special national conditions. Details of the special national conditions that apply for CENELEC countries in relation to EN 60 742 are given in annex ZC (informative). Attention is drawn to the fact that the special national condition specified for the Lnited Kingdom i
9、n Sub-clauses 5.1 and 1 1 . 1 of Section 2 of Chapter III is a statutory requirement in the CJiiited Kingdom based on Statutory Instrument No. 1367 : 1974 regulation 5. Cross-references. Details of other international publications quoted in this standard are given in Annex ZB. Where there are Britis
10、h Standards identical to these international standards, the relationship is given in nationat appendix B. Compliance with a British Standard does not of itself confer immunity from legal obligations. -,-,- EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60 742 January 1989 KEY WORDS: Isolating
11、transformers; safety isolating transformers; safety requirements; shaver transformers; transformers for toys; bell transformers; transformers for class III luminaires English Version Isolating transformers and safety isolating transformers - requirements Transformateurs de sparation des circuits et
12、transformateurs de scurit - Rgles (CE1 742 (1 983) ed 1, modifie) Trenntransformatoren und Sicherheitstransformatoren - Anforderungen (IEC 742 (1 983) Ausg. 1, modifiziert) This European Standard was ratified by CENELEC on 28 June 1988. CENELEC members are bound to comply with the requirements of th
13、e CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CENELEC Central Secretari
14、at or to any CENELEC member. This European Standard exists in three official versions (English, French and German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to CENELEC Central Secretariat has the same status a
15、s the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Elect
16、rotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue Brderode 2, B-1000 Brussels O CENELEC 1989 Copyright reserved to all CENELEC members Ref. No. EN 60 742 : 1989 E -,-,- EN 60 742 Page 2 Brief history
17、The CENELEC Questionnaire Procedure performed for finding out whether or not IEC 742 (1 st edition-1983) could be accepted without textual changes, has shown that some common modifications were necessary for the acceptance as European Standard (EN). The Reference Document was submitted to the CENELE
18、C members for formal vote and acceptance by CENELEC. Tech n cal text The text of the International Standard IEC 742 (1st edition-1983) modified, was approved by CENELEC on 28 June 1988 as a European Standard. Annexes designated normative are part of the body of the standard. Annexes designated infor
19、mative are given only for information. In this standard, annex ZA is informative. annex ZB is normative. annex ZC is informative. The following dates were fixed: -date of announcement (doa) -date of publication (dop) -date of withdrawal of conflicting national standard (dow) : 1 9 89-04-0 1 : 1989-1
20、 0-01 1989-1 0-01 -,-,- EN 60 742 Page 3 CONTENTS BRIEF HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TECHNICAL TEXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PREFAF . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GFNERAL PLAN 01 T H E ST4NiARI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHAPTER I: GENERAL REQUIREMENTS Clawe I . Scope and object . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . General requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . . 4 . General notes on tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . 6 . Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 . Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . Protection against electric sh
25、ock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . Change of input voltage setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IO . Output voltage and output current under load . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . 11 . No-load output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 . Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . 14 . Short-circuit and overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 . Protection against harmful ingress of water and moisture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I7 . Insulation resistance and
28、 electric strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i 8 . Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.Components . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 I . Supply connection and external flexible cables and cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 . Terminals for external conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . 23 . Provision for protective earthing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 . Screws and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 . Creepage distanc
31、es and clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 . Resistance to heat. abnormal heat, fire and tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 . Short-circuit voltage . . . . . . . . . . . . . . . . . . .
32、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 . Mechanical strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 . Internal wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . 27 . Resistance to rusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX IA - Production tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A P P E D I
34、 X IB - Examples intended to be used as a guide for Sub-clause 8.6 . . . . . . . . . . . . . . . . . . . . . . . APPENoIX IC - Examples of points of application of test voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . APPENIIX ID - Measurement of creepage distances and clearances . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX IE - Examplesofpointsofmeasurementofcreepagedistancesandclearances . . . . . . . . . . . . . . CHAPTER II: SUPPLEMENTARY REQUIREMENTS FOR ISOLATING TRANSFORMERS SEC TIO?. ONE . ISOLATING TRANSFORMERS FOR G E N E R A L USt . SHAVtR TRANSFORM
36、ERS 4NISHAVER StilPLY UNITS . . 2 . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 . M
37、arking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . Protection against electric shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1 . No-load output voltage . . . . . . . .
38、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 . Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I5 . Mechanical strength . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、. . . . . . . . . . . . . . . . . . . . . . . . IS . Construction . . . . . . . . . . . . . . . . . . . . . . . . . ; 19.Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 . Short-circuit and overload protection . . . . . .
40、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 2 5 1 8 9 15 15 16 17 17 21 26 26 27 27 27 32 35 36 37 40 42 44 45 50 56 57 59 63 67 69 70 13 75 80 82 82 83 84 84 84 85 85 87 87 -,-,- EN 60 742 Page 4 Cla
41、use Page 21 . Supply connection and external flexible cables and cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 . Terminals for external conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 . Provision for earthing . . . .
42、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 88 89 90 APPENDIX Il-I-A - Requirements for special socket-outlets for shaver supply units . . . . . . . . . . . . . . . . . . CHAPTER III: SUPPLEMENTARY REQUIREMENTS FOR SAFETY ISOLATING TRANSFORMERS
43、SECTION ONE . SAFETY ISOLATING TRANSFORMERS FOR GENERAL USE 5.Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 7.Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44、. . . . . . . . . . 92 92 92 I 1 . No-load output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 . Supply connection and external flexible cables and cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION Two .
45、TRANSFORMERS FOR TOYS 2 . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.Marking . . . .
46、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . Protection against electric shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . Change of input voltage setting . . . . . . . . . . . .
47、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I I . No-load output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 . Short-circuit and overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48、 . . . . . . . . . . . . . . . I5 . Mechanical strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 . Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.Com
49、ponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 . Supply connection and external flexible cables and cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IO . Output voltage and output current under load 12 . Short-circuit voltage . . . .