SIST EN 60990:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Methods of measurement of touch current and protective conductor current17.220.20Measurement of electrical and magnetic quantities13.260Protection against electric shock. Live workingICS:Ta slovenski standard je istoveten z:EN 60990:2016SIST EN 60990:2017en01-februar-2017SIST EN 60990:2017SLOVENSKI
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SIST EN 60990:2017



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE 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)
Méthodes de mesure du courant de contact et
du courant dans le conducteur de protection (IEC 60990:2016)
Verfahren zur Messung von Berührungsstrom 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 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 official 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 electrotechnical 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60990:2016 E SIST EN 60990:2017



EN 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 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 national 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 of 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, 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 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.
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EN 60990:2016 3 Annex ZA (normative)
Normative references to international 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 referenced 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 here: 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 - 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 - -
SIST EN 60990:2017



SIST EN 60990:2017



IEC 60990 Edition 3.0 2016-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Methods of measurement of touch current and protective conductor current
Méthodes de mesure du courant de contact et du courant dans le conducteur de protection
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 17.220, 35.020
ISBN 978-2-8322-3420-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN 60990:2017 colourinside



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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 General . 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 Equipment 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 voltage 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 Normal 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 method . 24 SIST EN 60990:2017



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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 fibrillation . 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 General . 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 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 RB . 35 G.1.3 Capacitor CS . 35 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 Calibration 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 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 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 SIST EN 60990:2017



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Figure 1 – Example of earthed neutral, direct supply . 12 Figure 2 – Example of earthed neutral, 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 on 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 connected 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 platform . 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, startle-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 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 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 neutral) 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 SIST EN 60990:2017



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Table H.3 – Square wave monopolar touch current response . 43 Table H.4 – Mixed ACnDC waveform 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 measuring 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 voltage 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
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INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
METHODS OF MEASUREMENT OF TOUCH CURRENT AND 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 concerning 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)”). 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 collaborates 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 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 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 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 responsible 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 committees 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 Publications.
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 patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60990 has been prepared by TC 108: Safety of electronic equipment within the field of audio/video, information technology and communication technology. This third edition cancels and replaces the second edition published in 1999. It constitutes a technical revision.
The principal changes in this edition as compared with the second edition are as follows: – the effects names have been updated to reflect increased understanding of the range of effects and is in concert with present usage;
– the conditions of use invoking a GRIPPABLE PART have been reduced in the application of the requirements based upon the current understanding of this effect;
– the references to ISO 10012-1, which has been replaced by management standard of the same number, have been replaced with explanatory text, where needed to maintain the sense of the document;
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IEC 60990:2016 © IEC 2016 – 7 –
– former informative Annex H (GRIPPABLE PART) has been deleted from this update as it does not properly represent the full set of conditions under which immobilization can occur. A new informative Annex H (Analysis of frequency filtered touch current circuits measurement) has been added;
– the Bibliography (formerly Annex M) has been updated with additional references for completeness.
The text of this standard is based on the following documents: FDIS Report on voting 108/630/FDIS 108/640/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. In this standard, the following print types or formats are used: – requirements proper and normative annexes: in roman type; – compliance statements and test specifications: in italic type; – notes/explanatory matter: in smaller roman type; – normative conditions within tables: in smaller roman type; – terms defined in Clause 3: SMALL CAPITALS. The committee has decided that the contents of this publication will remain unchanged until the maintenance result 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
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INTRODUCTION This International Standard was developed as a response to concerns arising from the advent of electronic switching techniques being broadly applied to power systems and within EQUIPMENT, giving rise to high-frequency harmonic voltages and currents. This standard is intended for the guidance of EQUIPMENT committees in preparing or amending the test specifications in their standards for measurement of leakage current. However the term "leakage current" is not used for reasons explained below. This standard was initially prepared under the basic safety function assigned to TC 74 (now TC 108), as follows: Methods of measuring leakage current This includes, for various types of EQUIPMENT, all aspects of what is referred to as "leakage current", including methods of measurement of current with regard to physiological effects and for installation purposes, under normal conditions and under certain fault conditions.
The methods of measurement of leakage current described herein result from the review of IEC TS 60479-1
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