1、BS EN3475-407:2009ICS 13.220.40; 49.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Cables, electrical,aircraft use TestmethodsPart 407 : FlammabilityThis British Standardwas published underthe authority of theStandards Policy andStrategy Com
2、mittee on 30September 2009 BSI 2009ISBN 978 0 580 67322 1Amendments/corrigenda issued since publicationDate CommentsBS EN 3475-407:2009National forewordThis British Standard is the UK implementation of EN 3475-407:2009. Itsupersedes BS EN 3475-407:2005 which is withdrawn.The UK participation in its
3、preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.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
4、 are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 3475-407:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3475-407August 2009ICS 13.220.40; 49.060 Supersedes EN 3475-407:2005 English VersionAerospace series - Cab
5、les, electrical, aircraft use - Testmethods - Part 407: FlammabilitySrie arospatiale - Cbles lectriques usagearonautique - Mthodes dessais - Partie 407 : Tenue laflammeLuft- und Raumfahrt - Elektrische Leitungen frLuftfahrtverwendung - Prfverfahren - Teil 407:EntflammbarkeitThis European Standard wa
6、s approved by CEN on 20 June 2009.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 nation
7、alstandards 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 into its own language and notif
8、ied 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, Latvia, Lithuania, Luxembourg, Malta,
9、 Netherlands, Norway, 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
10、 in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3475-407:2009: EBS EN 3475-407:2009EN 3475-407:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Equipment 4 4 Procedures .4 5 Acceptance criteria 8 BS EN 3475-407:2009EN 3475-407:2009 (E) 3 F
11、oreword This document (EN 3475-407:2009) 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 received the approval of the National Assoc
12、iations 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 2010, and conflicting national standard
13、s shall be withdrawn at the latest by February 2010. 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 rights. This document supersedes EN 3475-
14、407:2005. 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, Germany, Greece, Hungary, Iceland, Irelan
15、d, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3475-407:2009EN 3475-407:2009 (E) 4 1 Scope This standard specifies two methods of determining the flammability characteristics
16、 of a finished cable. It is intended to 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 referen
17、ced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. FAR 25, Airworthiness standards Transport category airplanes. JAR 25, Large aeroplanes. 3 Equipment The following equipment shall be required for these test
18、s: a) Test chamber: this shall be a chamber measuring not less than 700 mm high 300 mm wide 300 mm deep, open at the top, open at the front and situated in a draught-free environment but with sufficient air supply to provide normal combustion. General arrangements are shown in Figures 1 and 2. b) Bu
19、nsen type gas burner: the burner shall have a 6 mm inlet, a needle valve in the base for gas adjustment, a nominal bore of 9 mm and a barrel of approximately 100 mm above the air inlets. The gas supply shall be capable of achieving the test requirements defined in 4.1.2 and 4.2.2. WARNING NOTE Care
20、should be exercised in setting up and performing this test as toxic fumes may be given off during combustion. The test chamber shall be placed in a fume cabinet that will allow evacuation of gaseous products of combustion at the end of the test. 4 Procedures 4.1 Method 1 4.1.1 Preparation of test sp
21、ecimens Cut two sets of three specimens each, approximately 900 mm in length, consecutively from the same coil. Strip each end and place them in an atmosphere of (50 5) % relative humidity at a temperature of (21 3) C for a period of not less than 24 h. Keep the specimens in the conditioning area un
22、til just prior to testing. 4.1.2 Flame temperature 4.1.2.1 Adjust the Bunsen burner to produce a flame with an inner blue cone approximately one-third of the overall flame height. Insert a bare copper wire of (0,7 0,025) mm diameter, and having a free length of not less than 100 mm, into the flame,
23、the end of the wire being immediately above the tip of the inner cone. NOTE For initial setting-up purposes, an overall flame height of approximately 75 mm may be found suitable. BS EN 3475-407:2009EN 3475-407:2009 (E) 5 4.1.2.2 Adjust the burner so that the wire starts to melt within 4 s to 6 s of
24、being inserted into the flame. NOTE Alternatively for 4.1.2.1 and 4.1.2.2, a 0,8 mm to 0,81 mm diameter wire may be used in which case adjust the burner so that the wire starts to melt within 7 s to 9 s. 4.1.3 Mounting configuration 4.1.3.1 Mount the specimen in the test chamber as shown in Figure 1
25、 at an angle of (60 2) to the horizontal, parallel to, and approximately 150 mm from the front end of the test chamber. Clamp the conductor at the bottom of the apparatus. Pass the cable over the upper pulley and attach it to a weight which is just sufficient to keep the specimen straight within the
26、 test zone. Key 1 Box construction aluminium alloy 3,15 mm 6 600 - Distance between reference marks 2 Upper datum point 7 Flame application point (flame centre datum) 3 Pulley support bracket (low thermal conductivity) 8 Bottom clamp support (low thermal conductivity) 4 Support frame open at front 9
27、 Bunsen burner support (low thermal conductivity) 5 Weights as required a approx. Figure 1 Mounting configuration BS EN 3475-407:2009EN 3475-407:2009 (E) 6 4.1.3.2 Make a mark 200 mm above the lower clamp point and position the burner in the plane of this mark, perpendicular to the specimen and dire
28、cted towards the specimen at an angle of 30 to the vertical plane as shown in Figure 1, i.e. at 90 to the axis of the cable such that the flame will impinge directly onto the 200 mm mark. 4.1.3.3 Set the distance of the burner from the specimen such that the tip of the inner cone of the flame is imm
29、ediately below the specimen. 4.1.4 Flame application Apply the flame to each specimen of a set for a period of 15 s and then immediately remove the burner. Apply the flame to each specimen of the second set for a period of 30 s and then immediately remove the burner. NOTE 1 For thin wall insulation
30、the time of 15 s is considered more severe, as all the insulation can be carbonized in less than 30 s. NOTE 2 Nevertheless a test at 30 s is also necessary to assess FAR/JAR 25 requirements. NOTE 3 The 15 s value was introduce in P2 issue when 30 s value was initially removed. 4.2 Method 2 4.2.1 Pre
31、paration of test specimens Cut three specimens, approximately 450 mm in length, consecutively from the same coil. Strip each end and place them in an atmosphere of (50 5) % relative humidity at a temperature of (21 3) C for a period of not less than 24 h. Keep the specimens in the conditioning area
32、until just prior to testing. Remove 50 mm of insulation from one end of the specimen and mount it as shown in Figure 2. 4.2.2 Flame temperature Adjust the Bunsen burner to produce a 38 mm high soft yellow flame. 4.2.3 Mounting configuration Mount the specimen vertically in the test chamber as shown
33、in Figure 2. Fix the lower end of the conductor to the support bar and apply the fine wire to the conductor at the junction with the insulation. Pass the cable over the upper pulley and attach it to a weight which is just sufficient to keep the specimen straight within the test zone. BS EN 3475-407:
34、2009EN 3475-407:2009 (E) 7 Key 1 Clamp 4 Specimen 2 Pulley 5 Fine wire 3 Weight 6 Stripped conductor 50 mm Figure 1 Alternative mounting configuration Apply the 38 mm high yellow flame from the Bunsen burner to the specimen at the junction of the insulation and the bare conductor in such a manner th
35、at the lower end of the insulation is located half-way (19 mm) into the flame as shown in Figure 2. BS EN 3475-407:2009EN 3475-407:2009 (E) 8 4.2.4 Flame application Apply the flame to the specimen for a period of 15 s and then immediately remove the burner. 4.3 Completion of test (methods 1 and 2)
36、4.3.1 After the burner has been removed, note the time taken for all flaming of the specimen to cease and the length of specimen cable which has been burnt. 4.3.2 Repeat the procedure for the two other specimens. 5 Acceptance criteria 5.1 Method 1 During ignition and combustion, there shall be no fl
37、aming droplets or particles falling from the specimen. After the burner has been removed, the specimen cable shall cease flaming within the time specified in the product standard and within a total burnt length of 50 mm. The burn length shall be measured from the downward extent of propagation to th
38、e upward extent of propagation and including damage caused by the burner itself. 5.2 Method 2 During the test, there shall be no flaming droplets or particles falling from the specimen. After the burner has been removed, the specimen cable shall cease flaming within 10 s and within a total burnt or
39、charred length of 75 mm. The burnt length is the distance from the original junction of the insulation and the bare conductor, indicated by the bend made in the conductor, to the farthest point of damage. NOTE Where a product standard specifies only one burn time, this shall be taken as referring to
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