1、BSI Standards PublicationGuidance information on the application of capacitors, resistors, inductors and complete filter units for electromagnetic interference suppressionBS EN 60940:2015National forewordThis British Standard is the UK implementation of EN 60940:2015. It is identical to IEC 60940:20
2、15.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/40X, Capacitors and resistors for electronic equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary pr
3、ovisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 82519 4ICS 33.100.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publish
4、ed under the authority of theStandards Policy and Strategy Committee on 31 May 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60940:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60940 May 2015 ICS 33.100 English Version Guidance information on t
5、he application of capacitors, resistors, inductors and complete filter units for electromagnetic interference suppression (IEC 60940:2015) Guide demploi des condensateurs, rsistances, inductances et filtres complets dantiparasitage (IEC 60940:2015) Grundlagen fr die Anwendung von Kondensatoren, Wide
6、rstnden, Drosseln und vollstndigen Filtereinheiten zur Unterdrckung elektromagnetischer Strungen (IEC 60940:2015) This European Standard was approved by CENELEC on 2015-04-14. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
7、 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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three officia
8、l versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnic
9、al committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slo
10、vakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 C
11、ENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60940:2015 E BS EN 60940:2015EN 60940:2015 - 2 - Foreword The text of document 40/2337/FDIS, future edition 2 of IEC 60940, prepared by IEC/TC 40 “Capacitors and resistors for electroni
12、c equipment“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60940:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-01-14 latest da
13、te by which the national standards conflicting with the document have to be withdrawn (dow) 2018-04-14 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all suc
14、h patent rights. Endorsement notice The text of the International Standard IEC 60940:2015 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60068-2-78 NOTE Harmoniz
15、ed as EN 60068-2-78. IEC 60204-1 NOTE Harmonized as EN 60204-1. IEC 60384-14-1 NOTE Harmonized as EN 60384-14-1. IEC 60384-14-2 NOTE Harmonized as EN 60384-14-2. IEC 60384-14-3 NOTE Harmonized as EN 60384-14-3. IEC 60664-1 NOTE Harmonized as EN 60664-1. IEC 60938-1 NOTE Harmonized as EN 60938-1. IEC
16、 60938-2 NOTE Harmonized as EN 60938-2. IEC 60938-2-1 NOTE Harmonized as EN 60938-2-1. IEC 60938-2-2 NOTE Harmonized as EN 60938-2-2. IEC 60939-1 NOTE Harmonized as EN 60939-1. IEC 60939-2 NOTE Harmonized as EN 60939-2. IEC 60939-2-1 NOTE Harmonized as EN 60939-2-1. IEC 60939-2-2 NOTE Harmonized as
17、EN 60939-2-2. IEC 60950-1 NOTE Harmonized as EN 60950-1. IEC 62368-1 NOTE Harmonized as EN 62368-1. CISPR 11 NOTE Harmonized as EN 55011. CISPR 17 NOTE Harmonized as EN 55017. BS EN 60940:2015- 3 - EN 60940:2015 Annex ZA (normative) Normative references to international publications with their corre
18、sponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
19、ny amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu Publicatio
20、n Year Title EN/HD Year IEC 60335-1 - Household and similar electrical appliances - Safety - Part 1: General requirements EN 60335-1 - IEC 60384-14 - Fixed capacitors for use in electronic equipment - Part 14: Sectional specification - Fixed capacitors for electromagnetic interference suppression an
21、d connection to the supply mains EN 60384-14 - BS EN 60940:2015 2 IEC 60940:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Electromagnetic and Radio frequency interference suppression (EMI/RFI) 5 3.1 General . 5 3.2 Limits of interference 6 4 Classification of suppression c
22、omponents . 6 4.1 Suppression components 6 4.2 Capacitors 8 4.3 Inductors . 8 4.4 Filters . 8 5 Choice of ratings for specific applications 8 5.1 Voltage . 8 5.2 Current . 9 5.3 Environmental classification (climatic category) 9 5.4 Insertion loss 9 6 Connection of suppression components . 9 7 Safet
23、y aspects . 10 7.1 Class X and Y capacitors 10 7.2 Leakage current 11 7.3 Mounting of radio interference suppression components in equipment and appliances 11 7.4 Electrical shock hazard protection testing . 11 Bibliography 12 Figure 1 Example use of suppression components in EMI filter 7 BS EN 6094
24、0:2015IEC 60940:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ GUIDANCE INFORMATION ON THE APPLICATION OF CAPACITORS, RESISTORS, INDUCTORS AND COMPLETE FILTER UNITS FOR ELECTROMAGNETIC INTERFERENCE SUPPRESSION FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwid
25、e organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activ
26、ities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject
27、dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determi
28、ned by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committe
29、es. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which th
30、ey are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication
31、and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not res
32、ponsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical c
33、ommittees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Public
34、ations. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of p
35、atent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60940 has been prepared by IEC technical committee 40: Capacitors and resistors for electronic equipment. This second edition cancels and replaces the first edition published in
36、1988. This second edition is a result of maintenance activities related to the previous edition. All changes that have been agreed upon can be categorized as minor revisions. The text of this standard is based on the following documents: FDIS Report on voting 40/2337/FDIS 40/2362/RVD Full informatio
37、n 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. BS EN 60940:2015 4 IEC 60940:2015 IEC 2015 The committee has decided that the contents of this pub
38、lication will remain unchanged until the stability date indicated on the IEC website 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. BS EN 60940:2015IEC 60940:2015
39、IEC 2015 5 GUIDANCE INFORMATION ON THE APPLICATION OF CAPACITORS, RESISTORS, INDUCTORS AND COMPLETE FILTER UNITS FOR ELECTROMAGNETIC INTERFERENCE SUPPRESSION 1 Scope This international standard provides guidance applicable to information on application of capacitors, resistors, inductors, and comple
40、te filter units for electromagnetic interference suppression. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the
41、latest edition of the referenced document (including any amendments) applies. IEC 60335-1, Household and similar electrical appliances Safety Part 1: General requirements IEC 60384-14, Fixed capacitors for use in electronic equipment Part 14: Sectional specification Fixed capacitors for electromagne
42、tic interference suppression and connection to the supply mains 3 Electromagnetic and Radio frequency interference suppression (EMI/RFI) 3.1 General Electromagnetic interference, EMI, is any electromagnetic emission or any electric or electronic disturbance which causes an undesirable response, malf
43、unctioning or degradation in the performance of electrical equipment. Radio frequency interference, RFI, is any electrical energy with content within the frequency range dedicated to radio frequency transmission. Conducted RFI is most often found in the low frequency range from 150 kHz to 30 MHz. Ra
44、diated RFI is most often found in the frequency range from 30 MHz to 10 GHz. EMI or RFI propagate through conduction over signal and power lines and through radiation in free space. Electrical machines and apparatus may generate electromagnetic interferences (EMI) which are fed back into power suppl
45、y mains. These electromagnetic interferences may be picked up by apparatus connected to or placed close to the same power system up to a certain distance from the machine or apparatus. The radio-frequency voltages may be generated both between conductors (phases) of the power system (symmetrical int
46、erference) and also between conductors (phases) and earth (asymmetrical interference). These voltages can cause electromagnetic radiation from the power lines. BS EN 60940:2015 6 IEC 60940:2015 IEC 2015 Radio interference can be suppressed by providing a low impedance path for radio frequency curren
47、ts close to the place where the radio frequency voltages are generated. This may be combined with a high impedance element which prevents the radio frequency currents from penetrating into the power supply system, but has no appreciable effect on the flow of power current. 3.2 Limits of interference
48、 In various countries, mandatory limits are set to the radio-frequency in a given frequency range emanating from electrical machines and apparatus. A survey of these limits is given in relevant EMC-standards such as CISPR 11. Some electrical apparatus require for their operation a power-supply volta
49、ge free from radio-interference to a greater extent than that guaranteed by the requirements mentioned above. In these cases, similar measures should be taken at a place in the power supply system close to the place where the apparatus is connected. When the apparatus is shielded (or placed in a shielded room), interference suppression will generally be applied at each point where the power supply system enters the shielded enclosure. 4 Classification of suppression components 4.1 Suppression compon
