1、Methods of measurement of touch current and protectiveconductor currentBS EN 60990:2016BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN 60990:2016. It is identical to IEC 60990:2016. It supersedes B
2、S EN 60990:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/108, Safety of electronic equipment within the field ofaudio/video, information technology and communication technology.A list of organizations represented on this committee can be obta
3、ined onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 89313 1ICS 17.220.01; 35.020Complian
4、ce with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60990:2016EUROPEAN
5、STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60990 September 2016 ICS 17.220; 35.020 Supersedes EN 60990:1999 English Version Methods of measurement of touch current and protective conductor current (IEC 60990:2016) Mthodes de mesure du courant de contact et du courant dans le conducteur de protectio
6、n (IEC 60990:2016) Verfahren zur Messung von Berhrungsstrom und Schutzleiterstrom (IEC 60990:2016) This European Standard was approved by CENELEC on 2016-07-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stand
7、ard 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 official versions (Eng
8、lish, 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 electrotechnical committees o
9、f 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, Slovakia, Slovenia
10、, 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 2016 CENELEC All righ
11、ts of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60990:2016 E BS EN 60990:2016EN 60990:2016 2 European foreword The text of document 108/630/FDIS, future edition 3 of IEC 60990, prepared by IEC/TC 108 “Safety of electronic equipment within the field
12、 of audio/video, information technology and communication technology“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60990:2016. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical natio
13、nal standard or by endorsement (dop) 2017-04-04 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2019-07-04 This document supersedes EN 60990:1999 Attention is drawn to the possibility that some of the elements of this document may be the subject o
14、f patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60990:2016 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography
15、, the following notes have to be added for the standards indicated: IEC 60065 NOTE Harmonized as EN 60065. IEC 60309-1:1999 NOTE Harmonized as EN 60309-1:1999 (not modified). IEC 60335-1 NOTE Harmonized as EN 60335-1. IEC 60364-1 NOTE Harmonized as HD 60364-1. IEC 60364-4-41:2005 NOTE Harmonized as
16、HD 60364-4-41:2007 (modified). IEC 60601-1 NOTE Harmonized in EN 60601-1 series. IEC 60950-1 NOTE Harmonized as EN 60950-1. IEC 61010-1 NOTE Harmonized as EN 61010-1. IEC 62368-1 NOTE Harmonized as EN 62368-1. BS EN 60990:2016EN 60990:2016 3 Annex ZA (normative) Normative references to international
17、 publications with their corresponding 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 re
18、ferenced document (including any 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 h
19、ere: www.cenelec.eu. Publication Year Title EN/HD Year IEC/TS 60479-1 2005 Effects of current on human beings and livestock - Part 1: General aspects - - IEC/TS 60479-2 2007 Effects of current on human beings and livestock - Part 2: Special aspects - - IEC 61140 - Protection against electric shock -
20、 Common aspects for installation and equipment EN 61140 - ISO/IEC Guide 51 2014 Safety aspects - Guidelines for their inclusion in standards - - IEC Guide 104 2010 The preparation of safety publications and the use of basic safety publications and group safety publications - - BS EN 60990:2016 2 IEC
21、 60990:2016 IEC 2016 CONTENTS FOREWORD 6 INTRODUCTION 8 1 Scope . 10 2 Normative references 10 3 Terms and definitions 11 4 Test site 11 4.1 Test site environment 11 4.2 Test transformer . 12 4.3 Earthed neutral conductor . 12 5 Measuring equipment 13 5.1 Selection of measuring network . 13 5.1.1 Ge
22、neral . 13 5.1.2 Perception and startle-reaction 14 5.1.3 Letgo-immobilization 14 5.1.4 Electric burn (a.c.) . 14 5.1.5 Ripple-free d.c. 14 5.2 Test electrodes . 15 5.2.1 Construction 15 5.2.2 Connection 15 5.3 Configuration 15 5.4 Power connections during test . 15 5.4.1 General . 15 5.4.2 Equipmen
23、t for use only on TN or TT star power distribution systems . 19 5.4.3 Equipment for use on IT power distribution systems including unearthed delta systems 19 5.4.4 Equipment for use on single-phase centre-earthed power supply systems or on centre-earthed delta power supply systems 20 5.5 Supply volt
24、age and frequency . 20 5.5.1 Supply voltage . 20 5.5.2 Supply frequency . 20 6 Test procedure 20 6.1 General 20 6.1.1 Touch current measurements . 20 6.1.2 Control switches, equipment and supply conditions 21 6.1.3 Use of measuring networks 21 6.2 Normal and fault conditions of equipment 21 6.2.1 No
25、rmal operation of equipment 21 6.2.2 Equipment and supply fault conditions 21 7 Evaluation of results 23 7.1 Perception, startle-reaction and letgo-immobilization . 23 7.2 Electric burn . 23 8 Measurement of protective conductor current . 23 8.1 General 23 8.2 Multiple equipment 24 8.3 Measuring met
26、hod 24 BS EN 60990:2016IEC 60990:2016 IEC 2016 3 Annex A (normative) Equipment . 25 Annex B (normative) Use of a conductive plane . 26 Annex C (normative) Incidentally connected parts 27 Annex D (informative) Choice of current limits 28 D.1 General 28 D.2 Limit examples 28 D.2.1 Ventricular fibrilla
27、tion . 28 D.2.2 Inability to letgo-immobilization 28 D.2.3 Startle-reaction 28 D.2.4 Perception threshold 28 D.2.5 Special applications . 28 D.3 Choice of limits . 29 D.4 Electric burn effects of touch current . 30 Annex E (informative) Networks for use in measurement of touch current . 31 E.1 Gener
28、al 31 E.2 Body impedance network Figure 3 31 E.3 Startle-reaction (and body impedance) network Figure 4 . 31 E.4 Letgo-immobilization (and body impedance) network Figure 5 . 32 Annex F (informative) Measuring network limitations and construction 33 Annex G (informative) Construction and application
29、of touch current measuring instruments . 35 G.1 Considerations for selection of components . 35 G.1.1 General . 35 G.1.2 Power rating and inductance for RS and RB35 G.1.3 Capacitor CS35 G.1.4 Resistors R1, R2 and R3 36 G.1.5 Capacitors C1, C2 and C3 36 G.2 Voltmeter 36 G.3 Accuracy . 36 G.4 Calibrat
30、ion and application of measuring instruments 37 G.5 Records 37 G.6 Confirmation systems 37 Annex H (informative) Analysis of frequency filtered touch current circuit measurements . 39 Annex I (informative) AC power distribution systems (see 5.4) 47 I.1 General 47 I.2 TN power systems 48 I.3 TT power
31、 systems . 50 I.4 IT power systems 51 Annex J (informative) Routine and periodic touch current tests, and tests after repair or modification of mains operated equipment . 53 Annex K (normative) Network performance and calibration . 54 K.1 Network or instrument performance and initial calibration 54
32、K.2 Calibration in a confirmation system 56 K.2.1 General . 56 K.2.2 Measurement of input resistance 56 K.2.3 Measurement of instrument performance 56 Bibliography . 59 BS EN 60990:2016 4 IEC 60990:2016 IEC 2016 Figure 1 Example of earthed neutral, direct supply . 12 Figure 2 Example of earthed neut
33、ral, with transformer for isolation . 13 Figure 3 Measuring network, unweighted touch current 13 Figure 4 Measuring network, touch current weighted for perception or startle-reaction 14 Figure 5 Measuring network, touch current weighted for letgo-immobilization . 14 Figure 6 Single-phase equipment o
34、n star TN or TT system . 16 Figure 7 Single-phase equipment on centre-earthed TN or TT system 16 Figure 8 Single-phase equipment connected line-to-line on star TN or TT system . 17 Figure 9 Single-phase equipment connected line-to-neutral on star IT system 17 Figure 10 Single-phase equipment connect
35、ed line-to-line on star IT system 17 Figure 11 Three-phase equipment on star TN or TT system 18 Figure 12 Three-phase equipment on star IT system 18 Figure 13 Unearthed delta system 19 Figure 14 Three-phase equipment on centre-earthed delta system . 19 Figure A.1 Equipment 25 Figure B.1 Equipment pl
36、atform . 26 Figure F.1 Frequency factor for electric burn 33 Figure F.2 Frequency factor for perception or startle-reaction . 33 Figure F.3 Frequency factor for letgo-immobilization 34 Figure H.1 Triangular waveform touch current, startle-reaction . 40 Figure H.3 1 ms rise time pulse response, start
37、le-reaction 41 Figure H.4 1 ms rise time pulse response, letgo-immobilization 41 Figure H.5 Touch current vs. rise time plot, 20 ms square wave . 42 Figure H.6 PFC SMPS touch current waveform 42 Figure H.7 50 Hz square wave, 0,1 ms rise time, startle-reaction 43 Figure H.8 50 Hz square wave, 0,1 ms
38、rise time, letgo-immobilization 43 Figure H.9 IEC TS 60479-2 let-go threshold for AC and DC combinations augmented by additional data, mA each axis . 44 Figure H.10 Ex1 case: showing r.m.s. window 45 Figure H.11 Waveform ex2 case: showing r.m.s. window 45 Figure I.1 Examples of TN-S power system 48
39、Figure I.2 Example of TN-C-S power system 49 Figure I.3 Example of TN-C power system 49 Figure I.4 Example of single-phase, 3-wire TN-C power system 50 Figure I.5 Example of 3-line and neutral TT power system 50 Figure I.6 Example of 3-line TT power system 51 Figure I.7 Example of 3-line (and neutra
40、l) IT power system 51 Figure I.8 Example of 3-line IT power system . 52 Table H.1 Triangular waveform response comparison . 40 Table H.2 Square wave touch current response . 41 BS EN 60990:2016IEC 60990:2016 IEC 2016 5 Table H.3 Square wave monopolar touch current response 43 Table H.4 Mixed ACnDC w
41、aveform evaluation, ex1 45 Table H.5 Mixed ACnDC waveform evaluation, ex2 46 Table K.1 Calculated input impedance and transfer impedance for unweighted touch current measuring network (Figure 3) 54 Table K.2 Calculated input impedance and transfer impedance for startle-reaction touch current measuri
42、ng network (Figure 4) 55 Table K.3 Calculated input impedance and transfer impedance for letgo-immobilization current measuring network (Figure 5) . 55 Table K.4 Output voltage to input voltage ratios for unweighted touch current measuring network (Figure 3) . 57 Table K.5 Output voltage to input vo
43、ltage ratios for startle-reaction measuring network (Figure 4) 57 Table K.6 Output voltage to input voltage ratios for letgo-immobilization measuring network (Figure 5) 58 BS EN 60990:2016 6 IEC 60990:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METHODS OF MEASUREMENT OF TOUCH CURRENT A
44、ND PROTECTIVE CONDUCTOR CURRENT FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions c
45、oncerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”).
46、Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborate
47、s closely with the International Organization for Standardization (ISO) in accordance with conditions determined 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
48、relevant subjects since each technical committee has representation from all interested IEC National Committees. 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
49、the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they 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 and the correspo
