1、BRITISH STANDARDBS EN 3475-704:2007Aerospace series Cables, electrical, aircraft use Test methods Part 704: FlexibilityICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51
2、g60g53g44g42g43g55g3g47g36g58BS EN 3475-704:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 56705 6National forewordThis British Standard is the UK implementation of EN 3475-704:2007. It supersedes
3、BS EN 3475-704:2002 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Panel ACE/6/-/2, Aerospace Cables.A list of organizations represented on this committee can be obtained on request t
4、o its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROP
5、EAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-704August 2007ICS 49.060 Supersedes EN 3475-704:2002 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 704: FlexibilitySrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 704 : Flexibi
6、litLuft- und Raumfahrt - Elektrischen Leitungen fr LuftfahrtVerwendung - Prfverfahren - Teil 704: BiegsamkeitThis European Standard was approved by CEN on 21 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanSta
7、ndard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French
8、, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czec
9、h Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN
10、DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-704:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3
11、Test Procedures.4 EN 3475-704:20073 Foreword This document (EN 3475-704:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has receiv
12、ed the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 20
13、08, and conflicting national standards shall be withdrawn at the latest by February 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent righ
14、ts. This document supersedes EN 3475-704:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germ
15、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3475-704:20074 1 Scope This standard specifies two methods for appraising the flexibility of
16、a completed cable and its bending aptitude, Method 1 is for cables not less than 5 mm2cross-section cables and Method 2 for cables not larger than 5 mm2(10 AWG) cross-section cables. Unless otherwise specified in the product standard, Method 1 applies. It shall be used together with EN 3475-100. 2 N
17、ormative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series
18、 Cables, electrical, aircraft use Test methods Part 100: General. 3 Test Procedures 3.1 Method 1 (applicable for cable sizes larger than 5 mm2(10 AWG) 3.1.1 Preparation of specimens Sufficiently long test specimen shall be sampled from a completed cable and, after appropriate forming, shall undergo
19、a compression crushing test performed with an appropriate machine. For each test specimen, forming shall consist in making a loop of a diameter equal to 40 times the maximum diameter of the cable. The loop shall be made in the normal cable winding direction. The two ends shall be stripped over 5 mm
20、and placed together, then soldered with tin or spliced. Key 1 Dm = maximum diameter of the cable 2 Solder or splice Necessary length: 40 Dm = 125,7 Dm Figure 1 Test specimen forming EN 3475-704:20075 3.1.2 Apparatus The set-up shall comply with the specifications stipulated below and shall consist o
21、f a device designed crush the loop, preferably in the vertical direction, over a height 10 times the maximum diameter of the cable (25 % of the loop diameter) at a 100 mm/min speed. This device shall be fitted with a recording system. Key 1 Retaining notch 2 Position of loop connection Figure 2 Test
22、 mounting 3.1.3 Procedure This test shall be performed at ambient temperature. A test specimen shall be put in the crushing device with the loop junction point in contact with the support. Then, the test specimen shall be subjected to a gradual force F. 3.1.4 Requirements The force F applied to crus
23、h the loop 25 % shall be less than the value specified in the product standard. EN 3475-704:20076 3.2 Method 2 (applicable for cable sizes not larger than 5 mm2(10 AWG) 3.2.1 Preparation of specimens Cut the cable specimens, each approximately 200 mm long, consecutively from the same coil. The speci
24、mens shall be straightened by hand or when specified in the individual cable specification, hang each specimen vertically for 24 hours in an oven with the mass specified in Table 1 attached to its free end. The oven temperature is be as stated in the individual cable specification but shall not exce
25、ed the cables maximum rated temperature. After straightening the specimen test shall be performed within 1 hour at an ambient temperature (20 C 5 C). 3.2.2 Apparatus The apparatus shall consist of a device, shown in Figure 3, designed to examine the bending attitude. Key 1 Clamp 2 Mandrel 3 Specimen
26、 4 Recoil 5 Mass container Figure 1 Method 2, test apparatus 5 1 3 24 Dimensions in millimetresEN 3475-704:20077 3.2.3 Procedure Test the specimens using the rig shown in Figure 3, the diameter of the mandrel in the test rig being that specified in Table 1. Gradually apply a mass to the cable at the
27、 position shown in Figure 1 sufficient to bend the cable downwards through (9010). Ensure that the specimen remains in this position for 5 min and record the mass. After this time, remove the mass and allow the specimen to recoil towards its original position. At a time 5 min after removal of the ma
28、ss, record the recoil distance. Table 1 Cable size Mandrel diameter Straightening loadCode nearest AWG mm N 001 26 15 5 002 24 15 7 004 22 15 10 006 20 15 15 010 18 25 20 012 16 25 25 020 14 25 30 030 12 25 40 050 10 50 50 3.2.4 Requirements The mass required to bend the cable through (9010) and the
29、 recoil angle shall not exceed the values stated in the individual cable specification. EN 3475-704:2007BS EN 3475-704:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view o
30、n standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish 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 improve the qual
31、ity 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. Fax: +44 (0
32、)20 8996 7400.BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0
33、)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, unless otherwis
34、e requested.Information on standardsBSI 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 its products and se
35、rvices. 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 other benefits contact
36、 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- information about BSI is available on the BSI website at http:/www.bsi-.Copyright
37、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 retrieval system or transmitted in any
38、 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-.
