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ul497b

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2013-11-29 0人阅读 举报 0 0 暂无简介

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ULBISBN–ProtectorsforDataCommunicationsandFireAlarmCircuitsCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`CopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`UnderwritersLaboratoriesInc(UL)PfingstenRoadNorthbrook,ILULStandardforSafetyforProtectorsforDataCommunicationsandFireAlarmCircuits,ULBFourthEdition,DatedJune,SummaryofTopicsThisneweditionisaperiodicreissuancetoensurethatUL’sStandardsremainuptodatewithregardtoformatandeditorialissuessuchasrenumbering,repaginating,correctionofeditorialerrors,correctionofcrossreferencesandupdatingtitlesofreferencedStandardsThisneweditionalsocontainsanupdatedtitlepageandminoreditorialrevisionsinaccordancewiththerecentANSIapprovalofULBULStandardsforSafetyaredevelopedandmaintainedintheStandardGeneralizedMarkupLanguage(SGML)SGMLaninternationalstandard(ISO)isadescriptivemarkuplanguagethatdescribesadocument’sstructureandpurpose,ratherthanitsphysicalappearanceonapageDuetoformattingdifferencesresultingfromtheuseofUL’snewelectronicpublishingsystem,pleasenotethatadditionalpages(onwhichnorequirementshavebeenchanged)maybeincludedinrevisionpagesduetorelocationofexistingtextandreformattingoftheStandardAsindicatedonthetitlepage(page),thisULStandardforSafetyisanAmericanNationalStandardAttentionisdirectedtothenoteonthetitlepageofthisStandardoutliningtheprocedurestobefollowedtoretaintheapprovedtextofthisANSIULStandardTheULForewordisnolongerlocatedwithintheULStandardForinformationconcerningtheuseandapplicationoftherequirementscontainedinthisStandard,thecurrentversionoftheULForewordislocatedonULStandardsInfoNetat:http:ulstandardsinfonetulcomulforewordhtmlThemasterforthisStandardatUL’sNorthbrookOfficeistheofficialdocumentinsofarasitrelatestoaULserviceandthecomplianceofaproductwithrespecttotherequirementsforthatproductandservice,oriftherearequestionsregardingtheaccuracyofthisStandardUL’sStandardsforSafetyarecopyrightedbyULNeitheraprintedcopyofaStandard,northedistributiondisketteforaStandardonDisketteandthefilefortheStandardonthedistributiondisketteshouldbealteredinanywayAllofUL’sStandardsandallcopyrights,ownerships,andrightsregardingthoseStandardsshallremainthesoleandexclusivepropertyofULAllrightsreservedNopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformbyanymeans,electronic,mechanicalphotocopying,recording,orotherwisewithoutpriorpermissionofULRevisionsofULStandardsforSafetyareissuedfromtimetotimeAULStandardforSafetyiscurrentonlyifitincorporatesthemostrecentlyadoptedrevisionsULprovidesthisStandard″asis″withoutwarrantyofanykind,eitherexpressedorimplied,includingbutnotlimitedto,theimpliedwarrantiesofmerchantabilityorfitnessforanypurposeJUNE,−ULBtrCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`InnoeventwillULbeliableforanyspecial,incidental,consequential,indirectorsimilardamages,includinglossofprofits,lostsavings,lossofdata,oranyotherdamagesarisingoutoftheuseofortheinabilitytousethisStandard,evenifULoranauthorizedULrepresentativehasbeenadvisedofthepossibilityofsuchdamageInnoeventshallUL’sliabilityforanydamageeverexceedthepricepaidforthisStandard,regardlessoftheformoftheclaimULwillattempttoanswersupportrequestsconcerningelectronicversionsofitsStandardsHowever,thissupportserviceisofferedonareasonableeffortsbasisonly,andULmaynotbeabletoresolveeverysupportrequestULsupportstheelectronicversionsofitsStandardsonlyiftheyareusedundertheconditionsandoperatingsystemsforwhichitisintendedUL’ssupportpoliciesmaychangefromtimetotimewithoutnotificationULreservestherighttochangetheformat,presentation,filetypesandformats,deliverymethodsandformats,andthelikeofbothitsprintedandelectronicStandardswithoutpriornoticePurchasersoftheelectronicversionsofUL’sStandardsforSafetyagreetodefend,indemnify,andholdULharmlessfromandagainstanyloss,expense,liability,damage,claim,orjudgement(includingreasonableattorney’sfees)resultingfromanyerrorordeviationintroducedwhilepurchaserisstoringanelectronicStandardonthepurchaser’scomputersystemIfasingleuserversionelectronicStandardwaspurchased,onecopyofthisStandardmaybestoredontheharddiskofasinglepersonalcomputer,oronasingleLANfileserverorthepermanentstoragedeviceofamultipleusercomputerinsuchamannerthatthisStandardmayonlybeaccessedbyoneuseratatimeandforwhichthereisnopossibilityofmultipleconcurrentaccessIfamultipleuserversionelectronicStandardwaspurchased,onecopyoftheStandardmaybestoredonasingleLANfileserver,oronthepermanentstoragedeviceofamultipleusercomputer,oronanIntranetserverThenumberofconcurrentusersshallnotexceedthenumberofusersauthorizedElectronicStandardsareintendedforonlineuse,suchasforviewingtherequirementsofaStandard,conductingawordsearch,andthelikeOnlyonecopyoftheStandardmaybeprintedfromeachsingleuserversionofanelectronicStandardOnlyonecopyoftheStandardmaybeprintedforeachauthorizeduserofamultipleuserversionofanelectronicStandardBecauseofdifferencesinthecomputersoftwareprintersetupusedbyULandthoseofelectronicStandardspurchasers,theprintedcopyobtainedbyapurchasermaynotlookexactlyliketheonlinescreenviewortheprintedStandardAnemployeeofanorganizationpurchasingaULStandardcanmakeacopyofthepageorpagesbeingviewedfortheirownfairandorpracticalinternaluseTherequirementsinthisStandardarenowineffect,exceptforthoseparagraphs,sections,tables,figures,andorotherelementsoftheStandardhavingfutureeffectivedatesasindicatedinthenotefollowingtheaffecteditemThepriortextforrequirementsthathavebeenrevisedandthathaveafutureeffectivedatearelocatedaftertheStandard,andareprecededbya″SUPERSEDEDREQUIREMENTS″noticeNewproductsubmittalsmadepriortoaspecifiedfutureeffectivedatewillbejudgedunderalloftherequirementsinthisStandardincludingthoserequirementswithaspecifiedfutureeffectivedate,unlesstheapplicantspecificallyrequeststhattheproductbejudgedunderthecurrentrequirementsHowever,iftheapplicantelectsthisoption,itshouldbenotedthatcompliancewithalltherequirementsinthisStandardwillberequiredasaconditionofcontinuedListingandFollowUpServicesaftertheeffectivedate,andunderstandingofthisshouldbesignifiedinwritingCopyright©UnderwritersLaboratoriesIncJUNE,−ULBtrCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`ThisStandardconsistsofpagesdatedasshowninthefollowingchecklist:PageDateJune,JUNE,−ULBtrCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`JUNE,−ULBtrNoTextonThisPageCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`JUNE,ULBStandardforProtectorsforDataCommunicationsandFireAlarmCircuitsPriortothefirstedition,therequirementsfortheproductscoveredbythisstandardwereincludedintheStandardforProtectorsforCommunicationsCircuits,ULFirstEdition–January,SecondEdition–December,ThirdEdition–February,FourthEditionJune,ThemostrecentdesignationofANSIULBasanAmericanNationalStandard(ANSI)occurredonMay,ThisANSIULStandardforSafety,whichconsistsoftheFourthEditionwithrevisionsthroughJune,,isundercontinuousmaintenance,wherebyeachrevisionisANSIapproveduponpublicationCommentsorproposalsforrevisionsonanypartoftheStandardmaybesubmittedtoULatanytimeWrittencommentsaretobesenttoULSCStandardsDepartment,ScottBlvd,SantaClara,CAAneffectivedateincludedasanoteimmediatelyfollowingcertainrequirementsisoneestablishedbyUnderwritersLaboratoriesIncRevisionsofthisStandardwillbemadebyissuingrevisedoradditionalpagesbearingtheirdateofissueAULStandardiscurrentonlyifitincorporatesthemostrecentlyadoptedrevisions,allofwhichareitemizedonthetransmittalnoticethataccompaniesthelatestsetofrevisedrequirementsISBNCOPYRIGHT©,UNDERWRITERSLABORATORIESINCANSIULBCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`JUNE,ULBNoTextonThisPageCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`CONTENTSINTRODUCTIONScopeGeneralComponentsUnitsofmeasurementUndatedreferencesGlossaryCONSTRUCTIONGeneralEnclosuresGeneralSheetmetalNonmetallicCorrosionProtectionFieldWiringConnectionsGeneralFieldwiringterminalsApplique’unitsComponentsGeneralArresterassembliesElectricalinsulationmaterialSpacingsFusesPERFORMANCEGeneralStrikeVoltageBreakdownTestEnduranceConditioningTemperatureTestVariableAmbientConditioningHumidityConditioningDielectricVoltageWithstandTestVibrationConditioningJarringTestHighTemperatureTestDischargeTestRepeatedDischargeTestPolymericMaterialsTestsGeneralDistortionFlameLeadStrainReliefTestJUNE,ULBCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`MARKINGGeneralJUNE,ULBCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`INTRODUCTIONScopeTheserequirementscoverprotectorsfordatacommunicationsandfirealarmcircuitsAscoveredbytheserequirements,datacommunicationscircuitprotectorsandfirealarmcircuitprotectorsconsistofsingleandmultiplepairairgaparresters,gastubearresters,orsolidstatearresters,withorwithoutfusesorothervoltagelimitingdevicesDatacommunicationscircuitprotectorsandfirealarmcircuitprotectorsareintendedtoprotectequipment,wiring,andpersonnelagainsttheeffectsofexcessivepotentialsandcurrentscausedbylightningincommunicationsalarminitiatingoralarmindicatingloopcircuitsThisstandarddoesnotcoverthefollowing:a)LightningprotectivedevicesfortheprotectionofprimarydistributionwiringsystemsandequipmentsuchasACbranchcircuitprotectionb)Antennadischargeunitsforradioandtelevisionreceivingappliancesc)Lightningconductorandairterminalsforconnectionoflightningrodsforbuildingprotectiond)ProtectivedevicestobeusedontelephonelinesortelephonelinesconnectingtothetelecommunicationnetworksAproductthatcontainsfeatures,characteristics,components,materials,orsystemsnewordifferentfromthoseinusewhenthestandardwasdeveloped,andthatinvolvesariskoffire,electricshock,orinjurytopersonsshallbeevaluatedusingtheappropriateadditionalcomponentandendproductrequirementsasdeterminednecessarytomaintainthelevelofsafetyfortheuseroftheproductasoriginallyanticipatedbytheintentofthisStandardGeneralComponentsExceptasindicatedin,acomponentofaproductcoveredbythisstandardshallcomplywiththerequirementsforthatcomponentAcomponentisnotrequiredtocomplywithaspecificrequirementthat:a)Involvesafeatureorcharacteristicnotrequiredintheapplicationofthecomponentintheproductcoveredbythisstandard,orb)IssupersededbyarequirementinthisstandardAcomponentshallbeusedinaccordancewithitsratingestablishedfortheintendedconditionsofuseJUNE,ULBCopyrightUnderwritersLaboratoriesIncProvidedbyIHSunderlicensewithULNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS````,```,,`,,`,`,,`SpecificcomponentsareincompleteinconstructionfeaturesorrestrictedinperformancecapabilitiesSuchcomponentsareintendedforuseonlyunderlimitedconditions,suchascertaintemperaturesnotexceedingspecifiedlimits,andshallbeusedonlyunderthosespecificconditionsUnitsofmeasuremen

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