1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-412:2002 Cables, electrical, aircraft use Test methods Part 412: Humidity resistance The European Standard EN 3475-412:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 3475-41
2、2:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 10 July 2002 BSI 10 July 2002 ISBN 0 580 40049 2 National foreword This British Standard
3、 is the official English language version of EN 3475-412:2002. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/2, Aerospace cables, which has the responsibility to: A list of organizati
4、ons represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards
5、 Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard d
6、oes not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European dev
7、elopments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publicatio
8、n Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475412 June2002 ICS49.060 Englishversion AerospaceseriesCables,electrical,aircraftuseTest methodsPart412:Humidityresistance SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaisPartie412:Rsistance lhumidit LuftundRaumf
9、ahrtElektrischenLeitungenfrLuftfahrt VerwendungPrfverfahrenTeil412:Bestndigkeit gegenfeuchte ThisEuropeanStandardwasapprovedbyCENon20January2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwitho
10、utanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCE
11、NmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,Switzerlanda
12、ndUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475412:2002EEN3475412:2002(E) 2 Foreword
13、 Thisdocument(EN2591412:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspre
14、sentationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDecember2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorga
15、nizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdomEN3475412:2002(E) 3 1 Scope Thisstandardspecifi
16、esamethodofassessingthecapabilityofacabletoresistdifferenthotandhumid environments. ItshallbeusedtogetherwithEN3475100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandth
17、epublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapply tothisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferences thelatesteditionofthepublicationreferredtoapplies. EN3475100 AerospaceseriesCables,electrical,ai
18、rcraftuseTestmethodsPart100:General EN3475302 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart302:Voltage prooftest EN3475303 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart303:Insulation resistance EN3475405 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart405:Bendi
19、ngat ambienttemperature 3 Classificationoftests Twolevelsofhumidityresistancearedefinedtogetherwiththeirapplicabletestmethods: a) level1cablesThesecablesaregenerallylocatedinpressurisedareasatconventionalrelative humidityoratoperatingtemperatures(ambienttemperatureandheatingduetocurrent)greaterthan
20、100C.Forthesecables,methodAshallbeusedasspecifiedin6. b) level2cablesThesearecablesexposedtosevereenvironmentalconditions,highhumidity, extendedexposuretodifferentliquids,andwhereabsorbedhumidityisnotnormallydisplaced.Forthese cables,methodBshallbeusedasspecifiedin7. 4 Preparationofspecimens 4.1 Ins
21、ulatedconductors Cutalengthofcableappropriatetotherequirementsofthetestasdescribedin6or7(minimumlength 750mm).Strip25mmofinsulationfromeachendofthespecimen. 4.2 Screenedandjacketedcables Cutalengthofcableappropriatetotherequirementsofthetestasdescribedin6or7(minimumlength 750mm).Strip25mmofthejacket
22、fromeachendofthespecimen.EN3475412:2002(E) 4 5 Apparatus Aclimaticchambershallberequiredwhichiscapableofclosecontroloftemperatureandhumidity.Only distilledordemineralisedwatershallbeusedtoobtaintherequiredhumidity. 6 MethodA 6.1 Procedure 6.1.1 WindthespecimencablearoundthemandrelspecifiedinEN347540
23、5forthebendingtest.Place theassemblyinthechamberandconditionat(71 2 )Cand(90 5 )%relativehumidityforaperiodof6h. 6.1.2 Attheendofthe6hperiod,shutofftheheatandallowthespecimentocoolintheclosedchamber toatemperaturelowerthan38Cforaperiodof16h. 6.1.3 Reapplytheheatinordertostabilisethechamberat71Cinles
24、sthan2h. 6.1.4 Repeat6.1.2and6.1.3foratotalof15cyclesasshowninfigure1. Figure1Testcycles 6.2 Requirement Attheendofthe15 th cycle,unwindthecablefromthemandrelandsubjectittotheinsulationresistancetest specifiedinEN3475303. Themeasuredvalueobtainedshallbegreaterthanthatspecifiedintheproductstandard. 7
25、 MethodB 7.1 Procedure 7.1.1 PrepareaPTFEmandrel,ormandrelcoveredwithPTFE,thediameterofwhichis10times (0, - 5)%themaximumspecifiedouterdiameterofthecableundertest.Wind5turnsofcableroundthe mandrel,ensuringthatthecableisinclosecontactwiththemandrelandwitheachadjacentturnforall5 turns.Securethecablein
26、positiononthemandrel,forexamplebytyingortwistingthetwofreeends together. 6hours 16hours 2hours q C 71C 38C Repeatthisprocedurefor15cyclesEN3475412:2002(E) 5 7.1.2 Mountthespecimeninthetestchamberatthetemperaturedefinedintheindividualcableproduct standardand(93 2 3 + - )relativehumidity.Heatthespecim
27、entothetesttemperaturebeforethehumidityis raisedinordertopreventcondensationofthespecimen.Maintainthespecifiedtemperatureandhumidityin thetestchamberfortheperiodgivenintheindividualcableproductstandard. 7.2 Requirement Attheendofthetestperiod,andafterreturntostandardatmosphericconditionsforaminimumo
28、f1h,ora maximumof3h,removethespecimenfromthemandrel.Thecableshallbesubjectedto,andmeet,the requirementsofthecablebendingtestatambienttemperaturespecifiedinEN3475405andthevoltage prooftestspecifiedinEN3475302. NOTE Theportionofcabletiedortwistedtogetherandstrippedbackshallnotbeincludedinthe requireme
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