1、BRITISH STANDARD AEROSPACE SERIES BS EN 3475-304:2002 Cables, electrical, aircraft use Test methods Part 304: Surface resistance The European Standard EN 3475-304:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 3475-304
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 11 February 2002 BSI 11 February 2002 ISBN 0 580 38369 5 National foreword This British S
3、tandard is the official English language version of EN 3475-304:2002. 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 or
4、ganizations 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 S
5、tandards 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 St
6、andard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developme
7、nts 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 publication Amd.
8、No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3475304 January2002 ICS49.060 Englishversion AerospaceseriesCables,electrical,aircraftuseTest methodsPart304:Surfaceresistance SriearospatialeCbleslectriquesusage aronautiqueMthodesdessaiPartie304:Rsistance desurface LuftundRaumfahrtE
9、lektrischeLeitungenfrLuftfahrt, VerwendungPrfverfahrenTeil304: Oberflchewiderstand ThisEuropeanStandardwasapprovedbyCENon5August2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalterat
10、ion.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoi
11、tsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKing
12、dom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN3475304:2002EEN3475304:2002(E) 2 Foreword Thisdocumen
13、t(EN3475304:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoC
14、EN ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyJuly2002,andconflictingnationalstandardsshallbewithdrawnatthe latestbyJuly2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowi
15、ng countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN3475304:2002(E) 3 1 Scope Thisstandardspecifiesamethodoftestingth
16、esurfaceresistanceoffinishedcables. ItshallbeusedtogetherwithEN3475100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferen
17、ces,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN3475100 AerospaceseriesCables,electrical,aircraftuseTestmethodsPart100:General 3 Preparatio
18、nofspecimens Specimens0,15minlengthshallbetakenfromthefinishedcable. Thepreparedspecimensshallbecleanedinordertoremoveanycontamination.Aftercleaningtheyshallat notimebetouchedbybarefingers. 4 Apparatus Thetestarrangementisshownschematicallyfigure1. Electrodesspaced25mmapartshallbeappliedtotheinsulat
19、iononbothsidesofthemiddleofeach specimenbywindingonseveralturnsoffinetinnedcopperwireormetallictape.Theendsshallbelong enoughtomakeconnectionwiththecablesenteringthetestchamber.EN3475304:2002(E) 4 Dimensionsinmm Key 1 Coverseal(notshown) 5 Humiditymeasuringequipment 2 Cable1,5 6 Electrode 3 Glasscon
20、tainer 7 Specimen 4 Levelofsolution 8 Seal Figure1Deviceproposedfortestingsurfaceresistance 1 2 3 4 5 6 7 8 OthercableoutletarrangementEN3475304:2002(E) 5 5 Method 5.1 Environmentalconditions Theenvironmentalconditionsofthetestchambershallbeasfollows: relativehumidity(95 5 )%; ambienttemperature. 5.
21、2 Electrodes Theelectrodesshallensuregoodelectricalcontactwiththesurfaceofthespecimen. 5.3 Procedure Soldertheelectrodestotheconductorssothattheirendsareatleast25mmfromtheinternalwallsofthe testchamber,andkeepthemintheaboveconditionsfor96h.Afterthistimeapplyavoltageofbetween 200Vd.c.and500Vd.c.for1m
22、inandmeasuretheresistancebetweentheelectrodes. Then,voltageof2500Vr.m.s.atbetween40Hzand60Hzfrequencyshallbeappliedfor1minbetweenthe electrodes. 5.4 Requirements Atthecompletionoftheapplicationofthevoltagebetween200Vd.c.and500Vd.c.theresistancebetween theelectrodesshallbemeasured. Thesurfaceresistan
23、ceshallbecalculatedbymultiplyingthemeasuredvaluesinmegohmsbythediameter ofthespecimeninmm. Aftertheapplicationofthesecondvoltage(2500V),thereshallbenosparkbreakdown,nosmoke,nosign ofburning,nocracking,etc. Afterwaitingforaperiodof15minto20min,thesurfaceresistanceshallbemeasuredagainandthevalue obtai
24、ned,multipliedbythediameterofthespecimensinmm,shallnotbelowerthanthevaluestatedinthe technicalspecification.BS EN 3475-304:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the
25、 UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to imp
26、rove the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000
27、. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Servi
28、ces. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards
29、, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all
30、its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and ot
31、her benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI websit
32、e at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retriev
33、al system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.
