1、BS EN3475-417:2009ICS 49.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Cables, electrical,aircraft use TestmethodsPart 417: Fire resistance of cablesconfined inside a harnessThis British Standardwas published under theauthority of the Stand
2、ardsPolicy and StrategyCommittee on 30 April2009 BSI 2009ISBN 978 0 580 63187 0Amendments/corrigenda issued since publicationDate CommentsBS EN 3475-417:2009National forewordThis British Standard is the UK implementation of EN 3475-417:2009.The UK participation in its preparation was entrusted to Te
3、chnicalCommittee ACE/6.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot
4、confer immunityfrom legal obligations.BS EN 3475-417:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-417March 2009ICS 49.060English VersionAerospace series - Cables, electrical, aircraft use - Testmethods - Part 417: Fire resistance of cables confined inside aharnessSrie arospatiale - Cbl
5、es lectriques usagearonautique - Mthodes dessais - Partie 417: Tenue aufeu des cbles confins dans un harnaisLuft- und Raumfahrt - Elektrischen Leitungen fr LuftfahrtVerwendung - Prfverfahren - Teil 417: Feuerbestndigkeitvon Leitungen eingebunden in BndelnThis European Standard was approved by CEN on
6、 30 August 2008.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 references concerning such nationalstandards may be
7、 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 into its own language and notified to the CEN Man
8、agement 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, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
9、ay, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and b
10、y any means reservedworldwide for CEN national Members.Ref. No. EN 3475-417:2009: EBS EN 3475-417:2009EN 3475-417:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Preparation of specimens .4 4 Apparatus .4 5 Method 5 6 Requirements/Acceptance criteria .6 Annex A (normative) C
11、ircuit diagram principle for measurement of equipotentials .7 BS EN 3475-417:2009EN 3475-417:2009 (E) 3 Foreword This document (EN 3475-417:2009) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in acc
12、ordance 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 standard, either by publication
13、of an identical text or by endorsement, at the latest by September 2009, and conflicting national standards shall be withdrawn at the latest by September 2009. 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 sha
14、ll not be held responsible for identifying any or all such patent rights. 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, Est
15、onia, 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. BS EN 3475-417:2009EN 3475-417:2009 (E) 4 1 Scope This standard speci
16、fies a method of testing the fire resistance of fire resistance or fire-proof electrical cables inside a harness. The objective of this test is to qualify these cables when they are confined inside harnesses defined hereafter. Described configurations try to be representative of various cables confi
17、guration installed in Aircraft. It shall be used together with EN 3475-100. 2 Normative 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 refere
18、nced document (including any amendments) applies. EN 2346-002, Aerospace series Cable, electrical, fire resistant Operating temperatures between 65 C and 260 C Part 002 : General. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. EN 3475-408, Aerospace se
19、ries Cables, electrical, aircraft use Test methods Part 408: Fire resistance. ISO 2685, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designated fire zones. 3 Preparation of specimens Three specimens per configuration 0,75 m length shall be tested. See Figure 1.
20、4 Apparatus The test equipment shall be as required in EN 3475-408. Reminder of apparatus requirements: a) Burner: according with ISO 2685 or any other burner or assembly of burners satisfying the following conditions: The minimum width of the burner shall be 50 mm; Cable length exposed to the flame
21、: 152 mm; Diameter or width of the flame at the base of the burner 2 D (D = diameter of the harness under test); Flame temperature: (1 100 80) C; Heat flux density received by the calorimeter: (116 10) kW/m2. b) Test fixture: according with ISO 2685: The frame of the test fixture shall be vibrated w
22、ith the following characteristics: Direction perpendicular to the axis of the cable; Frequency : (30 5) Hz; Minimum acceleration: 4 g. c) Circuit diagram (see Annex A, Figures A.1 and A.2) BS EN 3475-417:2009EN 3475-417:2009 (E) 5 5 Method 5.1 Preparation of test specimens Unless otherwise specified
23、 in the product standard, 3 types of homogeneous harnesses of respective code 002 (AWG 24), 006 (AWG 20) and 020 (AWG 14) shall be tested. The cable used to build the harnesses is a three-core cable EN2346-xxxCyyy (see EN 2346-002). The composition of the harnesses will be 4, 12 and 19 cables connec
24、ted in series as in example for 4 cables. These cables shall be twisted with a lay length of 12 to 16 times the outer diameter of the harness. E1E2 E3 E4 Figure 1 Schema All first conductors of each three-core together in series (1stequipotential E1) All second conductors of each three-core together
25、 in series (2ndequipotential E2) All third conductors of each three-core together in series (3rdequipotential E3) An external protection Nickel coated or tin coated copper (85 % minimum coverage) sheath plus a Nomex braid (80 % minimum coverage) (4thequipotential E4). Each sample shall be mounted on
26、to a frame as defined in EN 3475-408. The sample shall be loaded with a force defined in Table 1. Table 1 In daN Gage 24 (002) Gage 20 (006) Gage 14 (020) n1 1,5 4 8 n2 4 8 8 n3 8 8 8 “n“ is the number of three-cores wires EN2346-xxxCyyy. BS EN 3475-417:2009EN 3475-417:2009 (E) 6 5.2 Procedure The t
27、est shall be performed according to EN 3475-408, without fluid immersion. Each sample shall be simultaneously subjected to the combined flame and vibration test during 5 min, then the flame will be removed and vibration still maintained during the following 10 min. The insulation resistance measurem
28、ents must be performed simultaneously between equipotential 1/2 (E1/E2) and equipotential 3/4 (E3/E4). 6 Requirements/Acceptance criteria Check the electrical continuity and insulation resistance of the cables during the test. The minimum insulation resistance shall be 10 000 , unless otherwise spec
29、ified in the product standard. BS EN 3475-417:2009EN 3475-417:2009 (E) 7 A mA 50 mA 0 mA 100 mA62,5 A0 A 5 A125 V L N 5 k 5 AA 50 mA 0 mA 100 mA62,5 A0 A 5 A125 V L N 5 k 5 AmA Annex A (normative) Circuit diagram principle for measurement of equipotentials Figure A.1 Circuit diagram principle for me
30、asurement of equipotentials 1 / 2 Figure A.2 Circuit diagram principle for measurement of equipotentials 3 / 4 BS EN3475-417:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national bod
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