UL-50E

ULCOPYRIGHTEDMATERIAL–NOTAUTHORIZEDFORFURTHERREPRODUCTIONORDISTRIBUTIONWITHOUTPERMISSIONFROMULUL50EEnclosuresforElectricalEquipment,EnvironmentalConsiderationsULCOPYRIGHTEDMATERIAL–NOTAUTHORIZEDFORFURTHERREPRODUCTIONORDISTRIBUTIONWITHOUTPERMISSIONFROMULULCOPYRIGHTEDMATERIAL–NOTAUTHORIZEDFORFURTHERREPRODUCTIONORDISTRIBUTIONWITHOUTPERMISSIONFROMULUnderwritersLaboratoriesInc.(UL)333PfingstenRoadNorthbrook,IL60062-2096ULStandardforSafetyforEnclosuresforElectricalEquipment,EnvironmentalConsiderations,UL50EFirstEdition,DatedSeptember4,2007SummaryofTopicsThisfirsteditionofANSI/UL50Eistheresultoftheharmonizationefforttodevelopatri-nationalstandardcoveringrequirementsforenclosuresforelectricalequipment.ThefirsteditionofUL50Econtainstheadditionalconstruction,performance,andmarkingrequirementsrelatedtotheenvironmentaltyperatingdesignations.Thenon-environmentalconstruction,performance,andmarkingrequirementsforenclosuresareincludedinthetwelftheditionofUL50.ThenewrequirementsaresubstantiallyinaccordancewithUL’sProposal(s)onthissubjectdatedMarch11,2005andAugust25,2006.Asindicatedonthetitlepage(page1),thisULStandardforSafetyisanAmericanNationalStandard.AttentionisdirectedtothenoteonthetitlepageofthisStandardoutliningtheprocedurestobefollowedtoretaintheapprovedtextofthisANSI/ULStandard.TheULForewordisnolongerlocatedwithintheULStandard.ForinformationconcerningtheuseandapplicationoftherequirementscontainedinthisStandard,thecurrentversionoftheULForewordislocatedonULStandardsInfoNetat:’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.SEPTEMBER4,2007−UL50Etr1ULCOPYRIGHTEDMATERIAL–NOTAUTHORIZEDFORFURTHERREPRODUCTIONORDISTRIBUTIONWITHOUTPERMISSIONFROMULULwillattempttoanswersupportrequestsconcerningelectronicversionsofitsStandards.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-serverorthepermanentstoragedeviceofamultiple-usercomputerinsuchamannerthatthisStandardmayonlybeaccessedbyoneuseratatimeandforwhichthereisnopossibilityofmultipleconcurrentaccess.Ifamultiple-userversionelectronicStandardwaspurchased,onecopyoftheStandardmaybestoredonasingleLANfile-server,oronthepermanentstoragedeviceofamultiple-usercomputer,oronanIntranetserver.Thenumberofconcurrentusersshallnotexceedthenumberofusersauthorized.ElectronicStandardsareintendedforon-lineuse,suchasforviewingtherequirementsofaStandard,conductingawordsearch,andthelike.OnlyonecopyoftheStandardmaybeprintedfromeachsingle-userversionofanelectronicStandard.OnlyonecopyoftheStandardmaybeprintedforeachauthorizeduserofamultiple-userversionofanelectronicStandard.Becauseofdifferencesinthecomputer/software/printersetupusedbyULandthoseofelectronicStandardspurchasers,theprintedcopyobtainedbyapurchasermaynotlookexactlyliketheon-linescreenviewortheprintedStan