1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58m
2、ethods Part 704: FlexibilityICS 49.060Aerospace series Cables, electrical, aircraft use Test BRITISH STANDARDBS EN 3475-704:2007BS EN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSIThis British Standard was published under the authorit
3、y of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008ISBN 978 0 580 56705 6Amendments/corrigenda issued since publicationDate CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Com
4、pliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN 3475-704:2007. It supersedes BS EN 3475-704:2002 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ACE/6,
5、 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 to its secretary.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-704August 2007ICS 49.060 Supersedes EN 3475-704:2002
6、 English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 704: FlexibilitySrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 704 : FlexibilitLuft- und Raumfahrt - Elektrischen Leitungen fr LuftfahrtVerwendung - Prfverfahren - Teil 704: Bieg
7、samkeitThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical r
8、eferences 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, German). A version in any other language made by translationunder the responsibility of a CEN member
9、 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, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi
10、a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2
11、007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-704:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Tes
12、t Procedures.4 EN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI3 Foreword This document (EN 3475-704:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries
13、and votes 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 ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national stan
14、dard, either by publication of an identical text or by endorsement, at the latest by February 2008, 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 righ
15、ts. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. 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 Stand
16、ard: Austria, Belgium, Bulgaria, Cyprus, Czech 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 the United Kingdom.
17、EN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI4 1 Scope This standard specifies two methods for appraising the flexibility of a completed cable and its bending aptitude, Method 1 is for cables not less than 5 mm2cross-section cable
18、s 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 Normative references The following referenced documents are indispensable for the application of this docu
19、ment. 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 Cables, electrical, aircraft use Test methods Part 100: General. 3 Test Procedures 3.1 Method 1 (applica
20、ble 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 a compression crushing test performed with an appropriate machine. For each test specimen, forming shall
21、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 and placed together, then soldered with tin or spliced. Key 1 Dm = maximum diameter of the cable 2 Solder
22、 or splice Necessary length: 40 Dm = 125,7 Dm Figure 1 Test specimen forming EN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI5 3.1.2 Apparatus The set-up shall comply with the specifications stipulated below and shall consist of a de
23、vice 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 mount
24、ing 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 crush the
25、loop 25 % shall be less than the value specified in the product standard. EN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI6 3.2 Method 2 (applicable for cable sizes not larger than 5 mm2(10 AWG) 3.2.1 Preparation of specimens Cut the
26、 cable specimens, each approximately 200 mm long, consecutively from the same coil. The specimens 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.
27、The oven temperature is be as stated in the individual cable specification but shall not exceed 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,
28、shown in Figure 3, designed to examine the bending attitude. Key 1 Clamp 2 Mandrel 3 Specimen 4 Recoil 5 Mass container Figure 1 Method 2, test apparatus 5 1 3 24 Dimensions in millimetresEN 3475-704:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c)
29、BSI7 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 position shown in Figure 1 sufficient to bend the cable downwards through (9010). Ensure that the specimen
30、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 mass, record the recoil distance. Table 1 Cable size Mandrel diameter Straightening loadCode nearest AWG mm N
31、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 recoil angle shall not exceed the values stated in the individual cable specification. EN 3475-704:2007Lice
32、nsed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSIBS EN BSILicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/05/2008 03:42, Uncontrolled Copy, (c) BSI389 Chiswick High RoadLondonW4 4AL3475-704:2007BSI British Standards InstitutionBSI is the indepe
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