UL60950-2002

UL60950ISBN0-7629-0470-4SafetyofInformationTechnologyEquipmentUnderwritersLaboratoriesInc.(UL)333PfingstenRoadNorthbrook,IL60062-2096ULStandardforSafetyforInformationTechnologyEquipment,UL60950ThirdEdition,DatedDecember11,2000Revisions:ThisStandardcontainsrevisionsthroughandincludingMarch15,2002.AnnouncementBulletin(s):ThisStandardcontainstheannouncementbulletin(s)datedJuly23,1999.TheannouncementbulletinislocatedattheendoftheStandard.ULStandardsforSafetyaredevelopedandmaintainedintheStandardGeneralizedMarkupLanguage(SGML).SGML--aninternationalstandard(ISO8879-1986)--isadescriptivemarkuplanguagethatdescribesadocument’sstructureandpurpose,ratherthanitsphysicalappearanceonapage.DuetoformattingdifferencesresultingfromtheuseofUL’snewelectronicpublishingsystem,pleasenotethatadditionalpages(onwhichnorequirementshavebeenchanged)maybeincludedinrevisionpagesduetorelocationofexistingtextandreformattingoftheStandard.Textthathasbeenchangedinanymannerismarkedwithaverticallineinthemargin.Thesechangesareeffectiveuponpublication.TherevisionsdatedMarch15,2002includeareprintedtitlepage(page1)forthisStandard.TherevisionsdatedMarch15,2002wereissuedtocorrectthedateofthemostrecentANSIapproval,toupdatetheULandCSAForewords,andtocorrecttypographicalerrors.Theseerrorsinclude:–5.1.8.2(page180):Thewords″knowntobelower″weremissingfromtheendofthelastparagraphonthepage.Thelastparagraphshouldread:″Itshallbeassumedthateachtelecommunicationportreceives0,25mA(I1)fromtheotherequipment,unlesstheactualcurrentfromtheotherequipmentisknowntobelower.–5.3.6(page189):RemovedtheD2Designationforthefirstparagraph(″Wheretherearemultipleoutlets...″)sincethiscompliancestatementispartoftheoriginalIECtext.–AnnexD(page235):InFigureD.1,replacedincorrectresistoridentifier″RS500W″with″RB500W.″–AnnexP.1(page276):Replacedtheincorrectsub-clausereference″t3.4″with″3.4.″–AnnexesP.1andP.2(pages275-283):AllreferencestoIECStandardsshouldbeintheformat″IEC6XXXX″.Forexample,replace″IEC85″with″IEC60085″onpage281.PleasenotethattheULandCSAversionsofthisStandardareidentical.However,becauseofdifferencesinpublishingsystems,ULhasissuedsomepages(68,131,and137)withaMarch15,2002date.IntheCSAversionofStandardthesepagesaredatedDecember1,2000.Asindicatedonthetitlepage(page1),thisULStandardforSafetyisanAmericanNationalStandard.Attentionisdirectedtothenoteonthebacksideofthetitlepage(page2)ofthisStandardoutliningtheprocedurestobefollowedtoretaintheapprovedtextofthisANSI/ULStandard.MARCH15,2002−UL60950tr1Asindicatedonthebacksideofthetitlepage(page2),thisULStandardforSafetyhasbeenadoptedbytheDepartmentofDefense.ThemasterforthisStandardatUL’sNorthbrookOfficeistheofficialdocumentinsofarasitrelatestoaULserviceandthecomplianceofaproductwithrespecttotherequirementsforthatproductandservice,oriftherearequestionsregardingtheaccuracyofthisStandard.UL’sStandardsforSafetyarecopyrightedbyUL.NeitheraprintedcopyofaStandard,northedistributiondisketteforaStandard-on-DisketteandthefilefortheStandardonthedistributiondisketteshouldbealteredinanyway.AllofUL’sStandardsandallcopyrights,ownerships,andrightsregardingthoseStandardsshallremainthesoleandexclusivepropertyofUL.Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformbyanymeans,electronic,mechanicalphotocopying,recording,orotherwisewithoutpriorpermissionofUL.RevisionsofULStandardsforSafetyareissuedfromtimetotime.AULStandardforSafetyiscurrentonlyifitincorporatesthemostrecentlyadoptedrevisions.ULprovidesthisStandard″asis″withoutwarrantyofanykind,eitherexpressedorimplied,includingbutnotlimitedto,theimpliedwarrantiesofmerchantabilityorfitnessforanypurpose.InnoeventwillULbeliableforanyspecial,incidental,consequential,indirectorsimilardamages,includinglossofprofits,lostsavings,lossofdata,oranyotherdamagesarisingoutoftheuseofortheinabilitytousethisStandard,evenifULoranauthorizedULrepresentativehasbeenadvisedofthepossibilityofsuchdamage.InnoeventshallUL’sliabilityforanydamageeverexceedthepricepaidforthisStandard,regardlessoftheformoftheclaim.ULwillattempttoanswersupportrequestsconcerningelectronicversionsofitsStandards.However,thissupportserviceisofferedonareasonableeffortsbasisonly,andULmaynotbeabletoresolveeverysupportrequest.ULsupportstheelectronicversionsofitsStandardsonlyiftheyareusedundertheconditionsandoperatingsystemsforwhichitisintended.UL’ssupportpoliciesmaychangefromtime-to-timewithoutnotification.ULreservestherighttochangetheformat,presentation,filetypesandformats,deliverymethodsandformats,andthelikeofbothitsprintedandelectronicStandardswithoutpriornotice.PurchasersoftheelectronicversionsofUL’sStandardsforSafetyagreetodefend,indemnify,andholdULharmlessfromandagainstanyloss,expense,liability,damage,claim,orjudgement(includingreasonableattorney’sfees)resultingfromanyerrorordeviationintroducedwhilepurchaserisstoringanelectronicStandardonthepurchaser’scomputersystem.Ifasingle-userversionelectronicStandardwaspurchased,onecopyofthisStandardmaybestoredontheharddiskofasinglepersonalcomputer,oronasingleLANfile-serverorthe