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
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