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    EN 3475-304-2002 en Aerospace Series - Cables Electrical Aircraft Use Test Methods - Part 304 Surface Resistance《航空航天系列 飞机用电缆 测试方法 第304部分 表面电阻》.pdf

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    EN 3475-304-2002 en Aerospace Series - Cables Electrical Aircraft Use Test Methods - Part 304 Surface Resistance《航空航天系列 飞机用电缆 测试方法 第304部分 表面电阻》.pdf

    1、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 LAW BS EN 3475-30412002 BS EN 3475-30412002 Amd. No. National foreword

    2、Date Comments 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 This British Standard is the official English language version o

    3、f The UKparticipation 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: EN 3475-30412002. - - aid enquirers to understand the text; present to the resp

    4、onsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to

    5、 its secretary. Cr oss-r e fer enc e s 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 Correspondence Index”, or by using the “Find” facility of t

    6、he 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 does not of itself confer immunity from legal obligations. Su

    7、mmary 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. O BSI 11 February 2002 ISBN O 580 38369 5 EUROPEAN STANDARD NORME EUROPENNE EU

    8、ROPISCHE NORM EN 3475-304 January 2002 ICs 49.060 English version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 304: Surface resistance Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessai - Partie 304: Rsistance de surface Luft- und Raumfahrt - Elektris

    9、che Leitungen fr Luftfahrt, Verwendung - Prfverfahren -Teil 304: Oberfichewiderstand This European Standard was approved by CEN on 5 August 2001 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a n

    10、ational standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in a

    11、ny other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, German

    12、y, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN

    13、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-304:2002 E EN 3475-304:2002 (E) Foreword This document (EN 3475-304:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After enquiries and votes

    14、carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN This European Standard shall be given the status of a national standard, eit

    15、her by publication of an identical text or by endorsement, at the latest by July 2002, and conflicting national standards shall be withdrawn at the latest by July 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to impl

    16、ement this European Standard : Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 3475-304:2002 (E) 1 Scope This standard specifies a method of

    17、 testing the surface resistance of finished cables. It shall be used together with EN 3475-100. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and

    18、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN

    19、3475-100 Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General 3 Preparation of specimens Specimens 0,15 m in length shall be taken from the finished cable. The prepared specimens shall be cleaned in order to remove any contamination. After cleaning they shall at no

    20、time be touched by bare fingers. 4 Apparatus The test arrangement is shown schematically figure 1. Electrodes spaced 25 mm apart shall be applied to the insulation on both sides of the middle of each specimen by winding on several turns of fine tinned copper wire or metallic tape. The ends shall be

    21、long enough to make connection with the cables entering the test chamber. 3 EN 3475-304:2002 (E) Dimensions in mm 6 -1I 7 8 Other cable outlet arrangement c-“ Key 1 Cover seal (not shown) 2 Cable 0 1,5 3 Glass container 4 Level of solution 5 Humidity measuring equipment 6 Electrode 7 Specimen 8 Seal

    22、 Figure 1 - Device proposed for testing surface resistance 4 EN 3475-304:2002 (E) 5 Method 5.1 Environmental conditions The environmental conditions of the test chamber shall be as follows: - relative humidity (95 f 5) %; - ambient temperature. 5.2 Electrodes The electrodes shall ensure good electri

    23、cal contact with the surface of the specimen. 5.3 Procedure Solder the electrodes to the conductors so that their ends are at least 25 mm from the internal walls of the test chamber, and keep them in the above conditions for 96 h. After this time apply a voltage of between 200 Vd.c. and 500 Vd.c. fo

    24、r 1 min and measure the resistance between the electrodes. Then, voltage of 2 500 Vr.m.s. at between 40 Hz and 60 Hz frequency shall be applied for 1 min between the electrodes. 5.4 At the completion of the application of the voltage between 200 Vd.c. and 500 Vd.c. the resistance between the electro

    25、des shall be measured. The surface resistance shall be calculated by multiplying the measured values in megohms by the diameter of the specimen in mm. After the application of the second voltage (2 500 V), there shall be no spark breakdown, no smoke, no sign of burning, no cracking, etc. After waiti

    26、ng for a period of 15 min to 20 min, the surface resistance shall be measured again and the value obtained, multiplied by the diameter of the specimens in mm, shall not be lower than the value stated in the tech n ica I s pecif cat ion. Req u i remen ts 5 BS EN 3475-30412002 BSI 389 Chiswick High Ro

    27、ad Lon don w4 4AL BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Re vi si ons British Standards are updated by amendment or revision. Users of Britis

    28、h Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve 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 t

    29、echnical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. 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. Buyin

    30、g standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: orders&-. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international

    31、 standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, 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

    32、Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 71 11. Fax: +44 (0)20 8996 7048. Email: infomi-. Subscribing members of BSI are kept up to date with stan

    33、dards developments and receive substantial discounts on the purchase price of standards. For details ofthese and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 700 1. Email: membershipbsi-. Information regarding online access to British Standards via

    34、British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, ofthe publications of the international standardization bodies. Exce

    35、pt as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval 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,

    36、in the course of implementing the standard, ofnecessary details such as symbols, and size, type or grade designations. Ifthese details are to be used for any other purpose than implementation then the prior written permission ofBSI 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: copyright&-.


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