1、BRITISH STANDARD AEROSPACE SERIESBS EN3745-407:2005Fibres and cables, optical, aircraft use Test methods Part 407: FlammabilityThe European Standard EN 3745-407:2005 has the status of a British StandardICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g4
2、4g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-407:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48639 7National forewordThis Br
3、itish Standard is the official English language version of EN 3745-407:2005. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/-/10, Aerospace Fibre optic systems and equipment, which has
4、 the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section e
5、ntitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Complia
6、nce with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related inter
7、national and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was la
8、st issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-407November 2005ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 407: FlammabilitySrie arospatiale - Fibres et cbles opti
9、ques usagearonautique - Mthodes dessais - Partie 407 :IninflammabilitLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 407:NichtentflammbarkeitThis European Standard was approved by CEN on 19 September 2005.CEN members are bound to comply with the CEN/CENELEC Intern
10、al 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 obtained on application to the Central Secretariat or to any CEN member.Th
11、is 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 Central Secretariat has the same status as the officialversions.CEN members are the
12、national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EU
13、ROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-407:2005: E2 Contents Fo
14、reword 3 1 Scope .4 2 Normative references .4 3 Preparation of specimens 4 4 Apparatus 4 5 Method .6 EN 3745-407:20053 Foreword This European Standard (EN 3745-407:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes
15、 carried out in accordance with the rules of this Association, this Standard has re-ceived 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,
16、either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or C
17、ENELEC shall 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, Cyprus, Czech Republic, Den-mark, Es
18、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3745-407:20054 1 Scope This standard specifies a method to determine the
19、resistance of an optical cable to the flame of a Bunsen burner. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of the referenced docume
20、nt (including any amendments) applies. ISO 4046:1978, Paper, board, pulp and related terms Vocabulary EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 100: General1)EN 3745-201, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 201: V
21、isual examination 3 Preparation of specimens 3.1 Specimen shall be prepared as specified in the product standard. If not at standard test conditions, the specimens shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 3745-100. 3.2 The following
22、details shall be specified if not already included in the technical specification: number and type of specimens to be tested; length of specimens (1 0,05) m; flame duration. 4 Apparatus The test requires a chamber, a pulley, a Bunsen type gas burner and tissue paper according to ISO 4046. The test c
23、hamber shall be approximately (0,3 0,5) m by 0,6 m in height, open at top and front to provide adequate ventilation for combustion but prevent drafts. The Bunsen type gas burner shall have a 6 mm inlet, a needle valve in the base for gas adjustment, a bore of 9,5 mm nominal, and a barrel length of a
24、pproximately 100 mm above the air inlets. The burner shall be adjusted to produce a 75 mm conical flame with an inner core approximately 25 mm in length and a flame temperature not less than 955 C at its hottest point, as measured by any appropriate system. A typical arrangement is shown in Figure 1
25、. 1) In preparation at the date of publication of this standard. EN 3745-407:20055 Dimensions in millimetres Key 1 Box construction aluminium alloy 3,15 mm 2 Top clamp support (low thermal conductivity) 3 Upper datum point 4 Support frame open at front 5 Bottom clamp support (low thermal conductivit
26、y) 6 Bunsen burner support (low thermal conductivity) 7 Rigid wire a500 approx. b600 approx. c300 approx. Figure 1 EN 3745-407:20056 5 Method 5.1 Procedure The specimen shall be secured at an angle of 60 to the horizontal, in a plane parallel to, and approximately 150 mm from the back of the chamber
27、. The specimen shall be clamped at its lower end with the test point 200 mm above the clamp point and it shall pass though the loops of the rigid wire. The upper end shall be clamped to top clamp support. With the burner held perpendicular to the specimen and at an angle of 30 from the vertical plan
28、e of the specimen, the hottest portion of the flame shall be applied to the lower side of the cable at the test mark. The tissue paper shall be suspended taut and horizontal 240 mm below the point of flame application and at least 15 mm above the chamber floor so that any material dropping from the
29、specimen shall fail upon the tissue. The period of flame application shall be 30 s and the flame shall be withdrawn immediately at the end of that period. 5.2 Final measurements and requirements EN 3745-201: Visual examination The distance burnt shall not exceed 75 mm. The time before the extinction
30、 of the test flame shall not exceed the specified value. No flaming particles shall fall from the specimen during the test and the tissue paper shall not be ignited. Holes or charred spots in the tissue shall be ignored in the absence of actual flame. Breaking of the specimen shall not be considered
31、 as failure provided the burnt length, the flame duration and consequences of the outflow of flaming materials or particles satisfy the specified requirements. EN 3745-407:2005blankBS EN 3745-407:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent nationa
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