I E C 60 4-8 ® Edition 4.0 201 5-03 I N TE RN ATI ON AL S TAN D ARD N ORM E I N TE RN ATI ON ALE F i xed capaci tors for u s e i n el ectron i c eq u i pm en t – P art 8: Secti on al s peci fi cati on : F i xe d capaci tors of ceram i c d i el ectri c, C l ass C on d en s ate u rs fi xes u ti l i s és d an s l e s éq u i pe m e n ts él ectron i q u es – P arti e : S péci fi cati on i n term é d i re: C on d e n s ate u rs fi xes d i él e ctri q u e en IEC 60384-8:201 5-03(en-fr) céram i q u e, C l as se T H I S P U B L I C AT I O N I S C O P YRI G H T P RO T E C T E D C o p yri g h t © I E C , G e n e v a , S wi tz e rl a n d All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester If you have any questions about I EC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local I EC member National Committee for further information Droits de reproduction réservés Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur Si vous avez des questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence IEC Central Office 3, rue de Varembé CH-1 21 Geneva 20 Switzerland Tel.: +41 22 91 02 1 Fax: +41 22 91 03 00 info@iec.ch www.iec.ch Ab ou t th e I E C The I nternational Electrotechnical Commission (I EC) is the leading global organization that prepares and publishes I nternational Standards for all electrical, electronic and related technologies Ab o u t I E C p u b l i ca ti o n s The technical content of IEC publications is kept under constant review by the IEC Please make sure that you have the latest edition, a corrigenda or an amendment might have been published I E C Catal og u e - 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webstore i ec ch /csc Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csc@iec.ch I E C 60 4-8 ® Edition 4.0 201 5-03 I N TE RN ATI ON AL S TAN D ARD N ORM E I N TE RN ATI ON ALE F i xed capaci tors for u s e i n el ectron i c e q u i pm e n t – P art 8: Secti on al s peci fi cati on : F i xe d capaci tors of ceram i c d i el e ctri c, C l ass C on d en s ateu rs fi xes u ti l i s é s d an s l e s éq u i pe m e n ts él e ctron i q u e s – P arti e : S péci fi cati on i n term é d i re: C on d en s ate u rs fi xes d i él e ctri q u e e n cé ram i q u e, C l as se INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 31 060.20 ISBN 978-2-8322-2283-6 Warn i n g ! M ake s u re th at you obtai n ed th i s pu bl i ca ti on from an au th ori zed d i s tri bu tor Atten ti on ! Veu i l l ez vou s ass u rer q u e vou s avez obten u cette pu bl i cati on vi a u n d i stri b u teu r ag ré é ® Registered trademark of the International Electrotechnical Commission –2– I EC 60384-8: 201 © I EC 201 CONTENTS FOREWORD General 1 Scope Object Norm ative references I nform ation to be given in a detail specification General Outline drawing and dimensions Mounting 4 Ratings and characteristics Marking 1 Terms and definitions 1 Marking 1 General 1 Marking for code of temperature coefficient 1 Marking on the bod y 1 Marking of the packaging 1 Additional marking 1 Preferred ratings and characteristics 1 Preferred characteristics 1 2 Preferred values of ratings 1 2 Rated temperature 1 2 Rated voltage ( UR ) 2 Category voltage ( UC ) 2 Preferred values of nom inal capacitance and associated tolerance values 2 Tem perature coefficient ( α ) Quality assessment procedures Primary stage of m anufacture Structurally sim ilar com ponents 3 Certified test records of released lots Qualification approval General Qualification approval on the basis of the fixed sample size procedure Tests Quality conformance inspection 22 Form ation of inspection lots 22 Test schedule 23 Delayed delivery 23 Assessm ent levels 23 Test and m easurement procedures 24 General 24 Visual exam ination and check of dimensions 24 Electrical tests 24 Capacitance 24 Tangent of loss angle (tan δ) 25 I EC 60384-8: 201 © I EC 201 –3– 3 I nsulation resistance ( R i ) 25 4 Voltage proof 26 4 Temperature coefficient ( α ) and temperature cyclic drift of capacitance 27 4 General 27 4 Prelim inary drying 27 4 Measuring conditions 27 4 Requirem ents 27 Robustness of terminations 27 Resistance to soldering heat 27 General 27 I nitial m easurement 27 Test conditions 27 Final inspection, m easurements and requirements 27 Solderability 28 General 28 Test conditions 28 Final inspection, m easurements and requirements 28 Rapid change of temperature (if required) 28 General 28 I nitial m easurement 28 Test conditions 28 Recovery 28 Vibration 28 General 28 Test conditions 29 Final inspection, m easurements and requirements 29 Bum p (repetitive shock) 29 1 General 29 I nitial m easurements 29 Test conditions 29 4 Final inspection, m easurements and requirements 29 1 Shock (non-repetitive shock) 29 1 General 29 1 I nitial m easurements 30 1 Test conditions 30 1 Final inspection, m easurements and requirements 30 Climatic sequence 30 General 30 2 I nitial m easurements 30 Dry heat 30 4 Damp heat, cyclic, Test Db, first cycle 31 Cold 31 Low air pressure 31 Damp heat, cyclic, Test Db, rem aining cycles 31 Damp heat, stead y state 32 General 32 I nitial m easurement 32 3 Test conditions 32 4 Recovery 33 –4– I EC 60384-8: 201 © I EC 201 5 Final inspection, m easurements and requirements 33 4 Endurance 33 4 General 33 4 I nitial m easurement 33 4 Test conditions 33 4 Recovery 34 4 Final inspection, m easurements and requirem ents 34 Component solvent resistance (if required) 34 Solvent resistance of the m arking (if required) 34 Annex A (normative) Figures with lim its of variation of capacitance with temperature for certain tem perature coefficients and classes 35 Bibliograph y 43 Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure A – α : + 00 (1 –6 /K) 35 A – α : (1 –6 /K) 36 A – α : –33 (1 –6 /K) 36 A – α : –75 (1 –6 /K) 37 A – α : –1 50 (1 –6 /K) 37 A – α : –220 (1 –6 /K) 38 A – α : –330 (1 –6 /K) 38 A – α : –470 (1 –6 /K) 39 A – α : –750 (1 –6 /K) 39 A – α : –1 000 (1 –6 /K) 40 A 1 – α : –1 500 (1 –6 /K) 40 A – α : –2 200 (1 –6 /K) 41 A – α : –3 300 (1 –6 /K) 41 A – α : –4 700 (1 –6 /K) 42 A – α : –5 600 (1 –6 /K) 42 Table – Preferred tolerances on nom inal capacitance Table – N om inal tem perature coefficient and tolerances Table – Com bination of tem perature coefficient and tolerance Table – Sampling plan together with num bers of perm issible non-conforming item s for qualification approval tests, assessment level EZ Table – Test schedule for qualification approval Table – Lot-by-lot inspection 23 Table – Periodic tests 24 Table – Tangent of loss angle 25 Table – I nsulation resistance requirem ents 26 Table – Test voltages for single layer ceramic capacitors 26 Table 1 – Test voltages for leaded m ultilayer ceramic capacitors 26 Table – Tem perature cyclic drift lim its 27 Table – Requirements 28 Table – Preferred severities (of non-repetitive shock) 30 I EC 60384-8: 201 © I EC 201 Table Table Table Table Table Table Table 15 16 17 18 19 20 21 –5– – M axim um capacitance change 30 – N umber of dam p heat cycles 31 – Final inspection, measurem ents and requirem ents 32 – Test conditions for dam p heat, stead y state 32 – Final inspection, measurem ents and requirem ents 33 – Endurance test conditions 34 – Final inspection, measurem ents and requirem ents 34 –6– I EC 60384-8: 201 © I EC 201 INTERNATI ONAL ELECTROTECHNI CAL COMMISSI ON F I XE D C AP AC I T O RS F O R U S E I N E L E C T RO N I C E Q U I P M E N T – P a rt : S e c ti o n a l s p e c i fi c a ti o n : F i x e d c a p a c i to rs o f c e m i c d i e l e c tri c , Cl ass FOREWORD ) The I nternati on al Electrotechni cal Comm ission (I EC) is a worl d wid e organization for stan dardization com prisin g all n ation al el ectrotechnical comm ittees (I EC National Comm ittees) The object of I EC is to prom ote internati onal co-operation on all questions concerni ng stand ardi zati on in the el ectrical an d electronic fields To this end and in additi on to other acti vities, I EC publish es I nternational Stan dards, Techn ical Specifications, Technical Reports, Publicl y Avail abl e Specificati ons (PAS) and Gu ides (h ereafter referred to as “I EC Publication(s)”) Thei r preparation is entrusted to technical comm ittees; any I EC National Comm ittee interested in the subj ect dealt with m ay partici pate in this preparatory work I nternational, governm ental an d n on governm ental organ izations l iaising with th e I EC also participate i n this preparation I EC collaborates closel y with the I nternational Organi zation for Stand ardization (I SO) in accordance with ditions determ ined by agreem ent between th e two organi zati ons 2) The form al decisions or ag reem ents of I EC on tech nical m atters express, as n early as possible, an i nternati onal consensus of opi nion on the rel evant subjects since each technical com m ittee has representati on from all interested I EC N ational Com m ittees 3) I EC Publications have the form of recomm endations for intern ational use an d are accepted by I EC National Com m ittees in that sense While all reasonable efforts are m ade to ensure that th e tech nical content of I EC Publications is accu rate, I EC cann ot be h eld responsi ble for th e way in which th ey are used or for an y m isinterpretation by an y en d u ser 4) I n order to prom ote intern ational u niform ity, I EC National Com m ittees und ertake to apply I EC Publications transparentl y to the m axim um extent possible i n their national an d regi on al publicati ons Any d ivergence between an y I EC Publication and the correspondi ng national or regi on al publicati on sh all be clearl y in dicated in the latter 5) I EC itself d oes n ot provi de an y attestation of conform ity I n depend ent certificati on bodies provi de conform ity assessm ent services and, in som e areas, access to I EC m arks of conform ity I EC is not responsi ble for an y services carri ed out by ind ependent certification bodi es 6) All users shou ld ensure that th ey have the l atest editi on of thi s publicati on 7) No liability shall attach to I EC or its directors, em ployees, servants or ag ents inclu din g in divi dual experts an d m em bers of its technical com m ittees and I EC Nati on al Com m ittees for any person al i njury, property d am age or other dam age of any nature whatsoever, wheth er di rect or indirect, or for costs (includ i ng leg al fees) and expenses arisi ng out of the publ ication, use of, or relian ce upon, this I EC Publicati on or any other I EC Publications 8) Attention is drawn to th e N orm ative references cited in th is publ ication Use of the referenced publ ications is indispensable for the correct applicati on of this publication 9) Attention is drawn to the possibility that som e of the elem ents of this I EC Publication m ay be the su bject of patent rig hts I EC shall not be held responsibl e for identifyi ng any or all such patent ri ghts I nternational Standard I EC 60384-8 has been prepared by I EC technical comm ittee 40: Capacitors and resistors for electronic equipm ent This fourth edition cancels and replaces the third edition published in 2005 This fourth edition is a result of m aintenance activities related to the previous edition All changes that have been agreed upon can be categorized as m inor revisions The text of this standard is based on the following documents: FDI S Report on votin g 40/2338/FDI S 40/2363/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 I EC 60384-8: 201 © I EC 201 –7– This publication has been drafted in accordance with the I SO/I EC Directives, Part A list of all parts in the I EC 60384 series, published under the general title Fixed capacitors for use in electronic equipment, can be found on the I EC website The committee has decided that the contents of this publication will rem ain unchanged until the stability date indicated on the I EC 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 am ended –8– I EC 60384-8: 201 © I EC 201 F I XE D C AP AC I T O RS F O R U S E I N E L E C T RO N I C E Q U I P M E N T – P a rt : S e c ti o n a l s p e c i fi c a ti o n : F i x e d c a p a c i to rs o f c e m i c d i e l e c tri c , Cl ass G e n e l 1 S co p e This part of I EC 60384 is applicable to fixed capacitors of ceram ic dielectric with a defined temperature coefficient (dielectric Class ), intended for use in electronic equipm ent, including leadless capacitors but excluding fixed surface m ount multilayer capacitors of ceramic dielectric, which are covered by I EC 60384-21 (Class ) Capacitors for electromagnetic interference suppression are not included, but are covered by I EC 60384-1 O bj ect The obj ect of this standard is to prescribe preferred ratings and characteristics and to select from I EC 60384-1 : 2008, the appropriate quality assessment procedures, tests and measuring methods and to give general perform ance requirem ents for this type of capacitor Test severities and requirem ents prescribed in detail specifications referring to this sectional specification shall be of equal or higher perform ance level because lower perform ance levels are not permitted N o rm a t i v e re fe re n c e s The following documents, in whole or in part, are norm ativel y referenced in this docum ent and are indispensable for its application For dated references, onl y the edition cited applies For undated references, the latest edition of the referenced document (including an y am endm ents) applies IEC 60063: 963, Preferred number series for resistors and capacitors IEC 60063: 963/AMD1 : 967 IEC 60063: 963/AMD2: 977 I EC 60068-1 : 201 3, Environmental testing – Part 1: General and guidance IEC 60384-1 : 2008, Fixed capacitors for use in electronic equipment – Part 1: Generic specification IEC 61 93-2: 2007, Quality assessment systems – Part 2: Selection and use of sampling plans for inspection of electronic components and packages ISO 3: 973, Preferred numbers – Series of preferred numbers I n fo rm a t i o n to b e g i v e n in a d etai l s p e c i fi c a t i o n G e n e l Detail specifications shall be derived from the relevant blank detail specification Detail specifications shall not specify requirements inferior to those of the generic, sectional or blank detail specification When more severe requirements are included, they shall be – 76 – I EC 60384-8: 201 © I EC 201 I l convient de choisir la sévérité d'essai partir des conditions d'essai indiquées dans le Tableau et de les spécifier dans la spécification particulière I l convient d'en choisir la durée conformément et elle doit être spécifiée dans la spécification particulière Tableau – Conditions d'essai continu de chaleur humide Sévéri té Température °C Humidité rel ative % + 85 ± 85 ± + 60 ± 93 ± 3 + 40 ± 93 ± Lorsqu'il est prescrit d'appliquer une tension, la tension UR doit être appliquée une m oitié de l'échantillon et aucune tension ne doit être appliquée l'autre moitié Dans les minutes qui suivent le retrait de l'essai de chaleur hum ide, l'essai de tenue en tension doit être effectué conform ément 4, m ais en appliquant la tension assignée 4.1 3.4 Reprise Après une période de rétablissement com prise entre heures et 24 heures, les condensateurs doivent être m esurés S'ils ne satisfont pas aux exigences, ils peuvent être m esurés une nouvelle fois après une période de rétablissement com prise entre heures et 24 heures 4.1 3.5 Contrôle final, mesures et exigences Le condensateur doit être examiné visuellement Aucun dommage ne doit être constaté et le m arquage doit être lisible Les condensateurs doivent être mesurés et doivent satisfaire aux exigences du Tableau Tableau – Contrôle final, mesures et exigences M easure Capacité Conditions d e mesure 4 Tang ente de l’angle d es pertes 3 Résistance d’isolem ent NOTE Les codes d es sous-cl asses a La pl us grand e des val eu rs b La pl us petite des valeurs α assignées et (sous-classe) (1 + 00 ≥ α ≥ –750 (1 (1 + 00 ≥ α ≥ –750 (1 SL (1 –750 ≥ α ≥ –1 500 (1 UM (1 –1 500 > α ≥ –5 600 Tous les α s et toutes l es sous-cl asses Tous les α s et toutes l es sous-classes sont expliq ués en 2 Exigences A) B) F) C) F) D) F) Variati on d e capacité ≤ % ou pF a Variati on d e capacité ≤ % ou pF a Variati on d e capacité ≤ % ou pF a ≤ × la valeu r d e 3 ≥ 500 M Ω ou 25 s b I EC 60384-8: 201 © I EC 201 – 77 – 4.1 Endurance 4.1 4.1 Généralités Voir l'I EC 60384-1 : 2008, 23, avec les détails suivants: 4.1 4.2 M esure initiale La capacité doit être mesurée selon 4.1 4.3 Conditions d'essai Les condensateurs doivent être soum is l'essai conform ément au Tableau 20 Tableau 20 – Conditions d'essai d'endurance Type Température Con densateu rs en céram ique m ulticouches Tem pératu re m axim ale d e catégorie Autres Tem pératu re m axim ale d e catégorie 4.1 4.4 Tension assignée V UR ≤ 200 200 < UR ≤ 500 500 < UR UR Tension d’ essai V UR , UR , UR , UR ,5 Durée h 000 500 000 000 Reprise Pour les essais, les condensateurs doivent être soum is aux conditions atm osphériques norm ales pendant heures 24 heures 4.1 4.5 Contrôle final, mesu res et exigences Le condensateur doit être exam iné visuellement Aucun dommage ne doit être constaté et le marquage doit être lisible Les condensateurs doivent être m esurés et doivent satisfaire aux exigences du Tableau 21 – 78 – I EC 60384-8: 201 © I EC 201 Tableau 21 – Contrơle final, mesures et exigences M easure Capacité Conditions d e mesure α assign ées et (sous-classe) Exigences + 00 ≥ α ≥ –750 (1 A) (1 B) Variati on d e capacité ≤ % ou pF a + 00 ≥ α ≥ –750 SL (1 F) (1 C) Variati on de capacité ≤ % ou pF a –750 ≥ α ≥ –1 500 UM (1 F) (1 D) –1 500 > α ≥ –5 600 (1 F) Variati on d e capacité ≤ % ou pF a Tang ente de l’angle d es pertes Tous les α s et toutes l es sous-classes ≤ , × l a valeur de 3 Résistance d’isolem ent 3 Tous les α s et toutes l es sous-classes ≥ 000 M Ω ou 40 s b NOTE Les codes d es sous-cl asses sont expl iqués en 2 a La pl us grand e des val eurs b La pl us petite des val eurs 4.1 Résistance du composant au solvant (si exigé) Voir l'I EC 60384-1 : 2008, 31 4.1 Résistance au solvant du marquage (si exigé) Voir l'I EC 60384-1 : 2008, 32 I EC 60384-8: 201 © I EC 201 – 79 – An nexe A (normative) Figu res représentant les l imi tes de variation de capacité en fonction de la température pou r certains coefficients de tem pérature et certaines classes ∆ C/ C20 (1 -3 ) Voir Figure A Figure A 15 1B 2,5 1A α : 00 × - /K 10 1A 7,5 1B 2,5 -2,5 -5 -7,5 -1 2,5 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Figu re A – α : + 00 (1 –6 /K) ∆ C/C20 (1 -3 ) – 80 – I EC 60384-8: 201 © I EC 201 10 α : × - /K 1F 1B 1A 1A -2 1B -4 -6 -8 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Fi gu re A – α : (1 –6 /K) 10 α : -33 × - /K 1B -2 1A -4 1A -6 -8 1B -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Fi gu re A – α : –33 (1 –6 /K) – 81 – ∆ C/C20 (1 -3 ) I EC 60384-8: 201 © I EC 201 15 10 α : -75 × - /K 1B -5 1A 1A -1 -1 1B -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Fig u re A – α : –75 (1 –6 /K) 30 20 α : -1 50 × -6 /K 10 1E -1 1B 1A 1A 1B 1E -20 -30 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Figu re A – α : –1 50 (1 –6 /K) ∆ C/C20 (1 -3 ) – 82 – I EC 60384-8: 201 © I EC 201 40 30 α : -220 × -6 /K 20 10 -1 1F 1B 1A 1A 1B -20 -30 -40 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Figu re A – α : –220 (1 –6 /K) 60 40 α : -330 × -6 /K 20 -20 1B 1A 1A 1B -40 -60 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Fi gu re A – α : –330 (1 –6 /K) ∆ C/C20 (1 -3 ) I EC 60384-8: 201 © I EC 201 – 83 – 60 40 α : -470 × -6 /K 20 -20 -40 -60 1B 1A 1A 1B -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Figu re A – α : –470 (1 –6 /K) 50 00 α : -750 × -6 /K 50 1F -50 1B 1A 1A 1B 1F -1 00 -1 50 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Fig u re A – α : –750 (1 –6 /K) – 84 – I EC 60384-8: 201 © I EC 201 ∆ C/C20 (1 -3 ) 50 00 α : -1 000 × - /K 50 -50 1F 1B 1A 1A 1B 1F -1 00 -1 50 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Fi gu re A – α : –1 000 (1 –6 /K) ∆ C/C20 (1 -3 ) 200 50 00 α : -1 500 × - /K 50 -50 -1 00 1F -1 50 -200 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Figu re A 1 – α : –1 500 (1 –6 /K) ∆ C/C20 (1 -3 ) I EC 60384-8: 201 © I EC 201 – 85 – 300 200 α : -2 200 × - /K 00 -1 00 1F -200 -300 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Fig u re A – α : –2 200 (1 –6 /K) 400 300 α : -3 300 × -6 /K 200 00 -1 00 -200 -300 1F -400 1F -500 -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Figu re A – α : –3 300 (1 –6 /K) ∆ C/C20 (1 -3 ) – 86 – I EC 60384-8: 201 © I EC 201 600 400 α : -4 700 × - /K 200 -200 1F -400 -600 -800 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC ∆ C/C20 (1 -3 ) Fi gu re A – α : –4 700 (1 –6 /K) 800 600 α : -5 600 × - /K 400 200 -200 -400 1F -600 -800 1F -60 -40 -20 20 40 60 80 00 20 40 T ( ° C) IEC Figu re A – α : –5 600 (1 –6 /K) I EC 60384-8: 201 © I EC 201 – 87 – Bibliographie I EC 60384-1 4, Sp é cifica tio n Co n de n s a te urs fixe s utilisé s da n s le s é quip e m e n ts é le ctro n ique s – Pa rtie : in te rm é dia ire – Co n de n s a te urs fixe s d'a n tip a sita ge et ccorde m e n t l'a lim e n ta tion I EC 60384-21 , Co n de n s a te urs fixe s utilisé s da n s le s é quip e m e n ts é le ctro n ique s – Pa rtie 21 : Sp é cifica tio n in te rm é dia ire – Co n de n sa te urs m ulticouch e s fixe s dié le ctrique s e n cé m ique p o ur m o n ta ge e n surfa ce , de Cla sse _ I N TE RN ATI O N AL E LE CTRO TE CH N I CAL CO M M I S S I O N 3, ru e d e Va re m bé P O B ox CH -1 1 G e n e va S wi tze rl a n d Te l : + 41 F a x: + 22 91 02 1 22 91 03 00 i n fo @i e c ch www i e c ch