IEC_60335-2-50.pdf

INTERNATIONALSTANDARDIEC60335-2-50Fourth edition2002-11Household and similar electrical appliances Safety Part 2-50:Particular requirements for commercialelectric bains-marieAppareils lectrodomestiques et analogues Scurit Partie 2-50:Rgles particulires pour les bains-marielectriques usage collectifReference numberIEC 60335-2-50:2002(E)Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(http:/www.iec.ch/searchpub/cur_fut.htm)enables you to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just Published This summary of recently issued publications(http:/www.iec.ch/online_news/justpub/jp_entry.htm)is also available by email.Please contact the CustomerService Centre(see below)for further information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00INTERNATIONALSTANDARDIEC60335-2-50Fourth edition2002-11Household and similar electrical appliances Safety Part 2-50:Particular requirements for commercialelectric bains-marieAppareils lectrodomestiques et analogues Scurit Partie 2-50:Rgles particulires pour les bains-marielectriques usage collectif IEC 2002 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chKFor price,see current cataloguePRICE CODECommission Electrotechnique InternationaleInternational Electrotechnical Commission 2 60335-2-50 IEC:2002(E)CONTENTSFOREWORD.3INTRODUCTION.51Scope.62Normative references.63Definitions.64General requirement.75General conditions for the tests.86Classification.87Marking and instructions.88Protection against access to live parts.109Starting of motor-operated appliances.1010Power input and current.1011Heating.1012Void.1113Leakage current and electric strength at operating temperature.1114Transient overvoltages.1115Moisture resistance.1116Leakage current and electric strength.1417Overload protection of transformers and associated circuits.1418Endurance.1419Abnormal operation.1420Stability and mechanical hazards.1421Mechanical strength.1522Construction.1523Internal wiring.1624Components.1725Supply connection and external flexible cords.1726Terminals for external conductors.1727Provision for earthing.1728Screws and connections.1829Clearances,creepage distances and solid insulation.1830Resistance to heat and fire.1831Resistance to rusting.1832Radiation,toxicity and similar hazards.18Annexes.20Bibliography.20Figure 101 Splash apparatus.1960335-2-50 IEC:2002(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES SAFETY Part 2-50:Particular requirementsfor commercial electric bains-marieFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the International