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FORINTERNALULORCSDSUSEONLY–NOTFOROUTSIDEDISTRIBUTIONSubject60950-1April28,2006SUMMARYOFTOPICSThefollowingchangesinrequirementsarebeingproposed:1.ForPreliminaryReviewOnly:TheProposedSecondEditionoftheStandardforInformationTechnologyEquipment–Safety–Part1:GeneralRequirements,UL60950-1.ThisneweditionisbasedontheSecondEditionofIEC60950-1.TechnicalchangestotheIECStandardarelistedinAnnexBBofthepublishedIEC60950-1,SecondEdition.ThesetechnicalchangeshavebeenincorporatedintotheneweditionoftheULStandard.NationalDifferencesfromtheFirstEditionofUL60950-1werereviewedandupdatedinthenewedition.ChangesarebeingproposedforClauses1–7andmanyoftheAnnexesintheStandard.COMMENTSDUE:JUNE27,2006PleasenotethattheproposalsarenotformattedexactlyastheywillbewhenpublishedaspartoftheStandard.Forexample,intheseproposals,nationaldifferenceidentifiersdirectlyprecedetheaffectedtextratherthanappearinginthemargintotherightoftheaffectedtext.NationaldifferenceidentifierswillappearinthemargininthepublishedStandard.Inaddition,thefontorformatofsomeheadingsmaybedifferent.Thisproposalisforreviewandcommentonly(noballotatthistime).Commentsreceivedduringthispreliminaryreviewperiodmaynotbeprovidedwitharesponse.AftercommentsareconsideredbythesubmitteroftheproposalandtheinvolvedHarmonizationCommitteeifapplicable,furtheractionwillbedeterminedrelativetowhetherornottheproposalwillbemodifiedandadvancedtothenextstep.ItisgenerallyUL’spracticeforproposedadditionstoexistingrequirementstobeshownunderlinedandproposeddeletionstobeshownlined-out.However,sinceUL60950-1isanIEC-basedStandard,nationaldifferencestoIEC60950-1textareshownunderlinedandlined-out.Therefore,forthisproposededitionofUL60950-1,alltextshownunderlinedandlined-outrepresentsnationaldifferencestotheIECtext.ThetextofUL60950-1firstedition,includingthebaseIECtextandallcurrentnationaldifferencescanbeviewedbyclickingonthe″ViewStandard″entryunder″Actions″ontheleftmenubaroftheCSDSWorkAreaHomepage.FORINTERNALULORCSDSUSEONLY–NOTFOROUTSIDEDISTRIBUTION1.ForPreliminaryReviewOnly:TheProposedSecondEditionoftheStandardforInformationTechnologyEquipment–Safety–Part1:GeneralRequirements,UL60950-1.ThisneweditionisbasedontheSecondEditionofIEC60950-1.TechnicalchangestotheIECStandardarelistedinAnnexBBofthepublishedIEC60950-1,SecondEdition.ThesetechnicalchangeshavebeenincorporatedintotheneweditionoftheULStandard.NationalDifferencesfromtheFirstEditionofUL60950-1werereviewedandupdatedinthenewedition.ChangesarebeingproposedforClauses1–7andmanyoftheAnnexesintheStandard.BACKGROUNDThisproposedstandardwasdevelopedbytheBi-NationalWorkingGroup(BNWG)forInformationTechnologyandTelecommunicationsEquipment,whichconsistsofrepresentationfromUL,CSA,andkeyU.S.andCanadianITandtelecommunicationequipmentindustrygroups.TheBNWGmeetsperiodicallytodiscusstheongoingdevelopmentofIEC60950-relatedstandardsandtheneedtoreviseordevelopcorrespondingCSA/UL60950seriesstandardsinordertomaintaincloseharmonizationbetweenthestandards.TheBNWGisresponsiblefordevelopingproposalsthatarethenconsideredbytheassociatedCanadianTechnicalSub-CommitteeandULStandardsTechnicalPanel(STP)foradoption.RATIONALETheintentoftheharmonizationeffortfortheCSA/UL60950seriesofStandardshasbeentoreducethenumberofnationaldifferencesfromIEC60950intheBinationalStandard(BNS).TheprimarymethodformaintainingaminimumamountofnationaldifferencesistotracktheeditionleveloftheIECstandardascloselyaspossible.Thiswaynationaldifferencesareminimizedduetoeditiondifferencesandonlyneedtodealwithrequirementsrelatedtocodeorothertechnicalissues.ReviewofExistingNationalDifferencesTheBNWGreviewedtheexistingnationaldifferencesinCSA/UL60950-1,firstedition,andconsideredwhetherthenationaldifferencesshouldbeincludedintheproposedCSA/UL60950-1,secondedition,andifanyrevisionstothenationaldifferenceswereneededinthesecondedition.Belowisasummaryofthenationaldifferencesdeterminedtoneedrevisionortonolongerbenecessary.Newnationaldifferencesarealsolisted.Existingnationaldifferencesinthefirsteditionnotlistedinthefollowingtableormentionedelsewhereinthisdocumentwereincludedintheproposedsecondeditionwithnosignificantchangesinwording.InsomecasesanexistingnationaldifferencewasabletobedeletedbecauseofarevisiontothebaseIECtext.RenumberingandupdatingofreferencedStandardtitleshavegenerallynotbeenidentified.APRIL28,2006SUBJECT60950-1-2-FORINTERNALULORCSDSUSEONLY–NOTFOROUTSIDEDISTRIBUTIONSub-clausereferenceChangestoExistingNationalDifferences1.2.8.2Note4Aof2.10.3.1referencing1.6.1.2relocatedasNote2of1.2.8.2.1.5.5ChangedsecondparagraphofexistingD1nationaldifferencetotypeDCandaddedreferencetotheCECinadditiontotheNEC.Entriesforsubclause1.5.5werealsoaddedtoAnnexesP.1andP.2toreferenceUL758andCSAC22.2No.210(standardsforappliancewiringmaterial)2.3.2.1[2.3.2in1sted]D2nationaldifferenceinfirstparagraphrewrittenbasedonrevisionofIECtext.RemovedD3nationaldifferencebasedonrevisionofIECtext(2.10.5.13).RemovedD2nationaldifferenceinNote2basedonrevisionofIECtext.2.6.3.4RemovedD1nationaldifferenceincompliancestatementbasedonrevisionofIECtext.2.10.3.1Note4Aof2.10.3.1refer