1、BRITISH STANDARD AEROSPACE SERIES Cables, electrical, aircraft use Test methods Part 303 : Insulation resistance The European Standard EN 3475-303:2002 has the status of a British Standard ICs 49.060 BS EN 3475-303 12002 BS EN 3475-30312002 Amd. No. National foreword Date Comments This British Stand
2、ard, 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 of The UKparticipation in its pre
3、paration 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 3475-30312002. - - aid enquirers to understand the text; present to the responsible European committee any
4、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 its secretary. Cr oss-r e fer
5、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 the BSI Standards Electronic Cat
6、alogue. 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. Summary of pages This document co
7、mprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover 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 38370 9 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
8、NORM EN 3475-303 January 2002 ICs 49.060 English version Aerospace series - Cables, electrical, aircraft use - Test methods - Part 303: Insulation resistance Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessai - Partie 303: Rsistance disolement Luft- und Raumfahrt - Elektrische Le
9、itungen fr Luftfahrt, Verwendung - Prfverfahren -Teil 303: Isolationswiderstand 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 nation
10、al 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 any ot
11、her 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, Germany, Gr
12、eece, 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 All r
13、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3475-303:2002 E EN 3475-303:2002 (E) Foreword This document (EN 3475-303:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After enquiries and votes carri
14、ed 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, either b
15、y 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 implement
16、 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 3475-303:2002 (E) 1 Scope This standard specifies a method of meas
17、uring the insulation 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 The specimens, of at least 10 m length, shall be taken from finished cables. The solution used for the immersion test shall have the following composition: - sodium chloride 30
20、g; - distilled water 1 ooog; - wetting agent 2 cl. 4 Immersion test The specimens shall be immersed in the solution defined in 3 with their ends protruding at least 150 mm. The immersed length L shall be known and shall exceed 10 m. After one hours immersion at test temperature (20 f 2) OC and (95 f
21、 2) OC, a voltage of between 200 Vd.c. and 500 Vd.c., shall be applied for 1 min as shown below: - insulated conductor: between solution and conductor; - screened and jacketed cables: between solution and screen The insulation resistance, in MCl.km calculated from the formula - RL where R is the res
22、istance of L (m) 1 O00 shall be at least equal to: - insulated conductor: the value stated in the technical specification; - screened and jacketed cables: the value shown for the jacket in the technical specification. 3 EN 3475-303:2002 (E) 5 Dry test The insulation resistance shall be measured betw
23、een each insulated conductor of length L and all the others connected together and to the screen if present. A voltage of between 200 Vd.c. and 500 Vd.c., shall be applied for 1 min at ambient temperature. The insulation resistance in MCl.km calculated from the formula - where R is the resistance of
24、 length L (m), shall be at least equal to the value given in the technical specification RL 1 O00 4 BS EN 3475-303 12002 BSI 389 Chiswick High Road 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 t
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