IEC_61558-1_1998_-_Safety_of_power_transformers_power_supply_units.pdf

IS O1 Interpretation of subclause 19.8 IEC 61558-1:1997,First edition Safety of power transformers,power supply units and similar-Part 1:General requirements and tests INTERPRETATION SHEET In trod u ction:WGI of TC96 has been requested to provide urgently a clarification of the bridge allowed by resistors or capacitors between different conductive parts.A clarification of subclause 19.8 of IEC 61558-1 Ed.1 has been agreed by WGI of TC96 as follows:“19.8 Conductive parts separated by double or reinforced insulation,e.g.live parts and the body or primary and secondary circuits,may be bridged(conductive bridge)by resistors or Y2 capacitors provided that they consist of at least two separate components whose impedance is unlikely to change significantly during the lifetime of the transformer.If the resistors are used they shall comply with the requirements of test(a)in 14.1 of IEC 60065.If capacitors are used they shall comply with the relevant requirements of I EC 60384-1 4.Where two capacitors are used in series,they shall each be rated for the total working voltage across the pair and shall have the same nominal capacitance value.If any one of such two components is short-circuited or open-circuited,the values specified in Clause 9 shall not be exceeded.In addition,if the working voltage does not exceed 250 V,conductive parts separated by double or reinforced insulation,e.g.live parts and the body or primary and secondary circuits,may be bridged by a single Y1 capacitor complying with the relevant requirements of I EC 60384-1 4.NOTE A Y1 capacitor is considered to have reinforced insulation.Compliance is checked by inspection and by measurement.”REMARKS-This interpretation of subclause 19.8 is not applicable to the transformer for toys covered by IEC 61558-2-7.-This clarification having been introduced in the draft IEC 61558-1,Second edition,this interpretation sheet will be automatically cancelled at the date of publication of IEC 61558-1 Ed.2.Decem ber 2003 ICs 29.180 Copyright International Electrotechnical Commission Provided by IHS under license with IECDocument provided by IHS Licensee=Agip KOC/5950653001,02/25/2004 06:45:51 MSTQuestions or comments about this message:please call the Document Policy Groupat 303-397-2295.-,-,-NORME CE1 I N T E R N AT I O N AL E I N T E R N AT I O N AL STANDARD IEC 61 5584 Edition 1.1 1998-07 Edition 1:I 997 consolide par lamendement 1:I998 Edition 1:I 997 consolidated with amendment 1:I 998 PUBLICATION GROUPE DE SCURIT GROUP SAFETY PUBLICATION Scurit des transformateurs,blocs dalimentation et analogues-Partie 1:Rgles gnrales et essais Safety of power transformers,power supply units and similar-Part 1:General requirements and tests Numro de rfrence Reference number CEI/IEC 61558-1:I 997+A1:I998 Copyright International Electrotechnical Commission Provided by IHS under license with IECDocument provided by IHS Licensee=Agip KOC/5950653001,02/25/2004 06:45:51 MSTQuestions or comments about this message:please call the Document Policy Groupat 303-397-2295.-,-,-Numros des publications Depuis le l e r janvier 1997,les publications de la CE1 sont numrotes partir de 60000.Publications consolides Les versions consolides de certaines publications de la CE1 incorporant les amendements sont disponibles.Par exemple,les numros ddition 1.0,1.1 et 1.2 indiquent respectivement la publication de base,la publication de base incorporant lamendement 1,et la publication de base incorporant les amendements 1 et 2.Validit de la prsente publication Le contenu technique des publications de la CE1 est constamment revu par la CE1 afin quil reflte ltat actuel de la technique.Des renseignements relatifs la date de reconfirmation de la publication sont disponibles dans le Catalogue de la CEI.Les renseignements relatifs des questions ltude et des travaux en cours entrepris par le comit technique qui a tabli cette publication,ainsi que la liste des publications tablies,se trouvent dans les documents ci-dessous:Site web de la CEP Catalogue des publications de la CE1 Publi annuellement et mis jour rgulirement(Catalogue en ligne)*Disponible la fois au site web de la CEI*et comme priodique imprim Bulletin de la CE1 Term i no I og e,sy m bo les g rap h i q ues et I i tt ra ux En ce qui concerne la terminologie gnrale,le lecteur se reportera la CE1 60050:Vocabulaire Electro-technique International(VEI).Pour les symboles graphiques,les symboles littraux et les signes dusage gnral approuvs par la CEI,le lecteur consultera la CE1 60027:Symboles littraux utiliser en lectrotechnique,la CE1 6041 7:Symboles graphiques utilisables sur le matriel.Index,relev et compilation des feuilles individuelles,et la CE1 60617:Symboles graphiques pour schmas.*Voir adresse site web sur la page de titre.Num bering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.Consolidated publications Consolidated versions of some IEC publications including amendments are available.For example,edition