1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 2234:2012Aerospace series Cable,electrical, fire resistant Technical specificationBS EN 2234:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implement
2、ation of EN 2234:2012.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to includ
3、e all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 68924 6ICS 49.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British St
4、andard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationDate Text affectedBS EN 2234:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2234 March 2012 ICS 49.060 English Version Aerospace series - Cable, electr
5、ical, fire resistant - Technical specification Srie arospatiale - Cbles lectriques rsistant au feu - Spcification technique Luft- und Raumfahrt - Elektrische Leitungen, feuerbestndig - Technische Lieferbedingungen This European Standard was approved by CEN on 23 December 2011. CEN members are bound
6、to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-
7、CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has
8、 the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
9、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any for
10、m and by any means reserved worldwide for CEN national Members. Ref. No. EN 2234:2012: EBS EN 2234:2012EN 2234:2012 (E) 2 Contents Page Forword 31 Scope 42 Normative references 43 Terms, Definitions and Symbols 44 Materials and construction .44.1 Conductors .44.2 Construction .55 Required characteri
11、stics .56 Tests method 57 Quality assurance 97.1 Qualification .97.2 Acceptance tests 108 Identification marking 119 Packaging, labelling, and delivery lengths 119.1 Packaging and labelling . 119.2 Delivery lengths 11BS EN 2234:2012EN 2234:2012 (E) 3 Forword This document (EN 2234:2012) has been pre
12、pared 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 Associations and the Official Services of the member count
13、ries 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 September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012
14、. 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. According to the CEN/CENELEC Internal Regulations, the national standards organizati
15、ons of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal
16、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 2234:2012EN 2234:2012 (E) 4 1 Scope This European Standard specifies the required characteristics and test procedures for fire resistant or fire-proof electrical cables for use in aircraft electrical syst
17、ems. These cables should also maintain a specific surface resistance when they are subjected to a flame of 1 100 C after 5 minutes (fire resistant) or 15 minutes (fire-proof) exposure. They should be rated at an a.c. voltage of 600 V r.m.s., a frequency of maximum 2 000 Hz and a long term temperatur
18、e of up to 260 C (ambient temperature plus temperature rise in conductor). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated ref
19、erences, 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 EN 3838, Aerospace series Requirements and tests on user-applied markings on aircraft electrical cables EN 9133, Ae
20、rospace series Quality management systems Qualification procedure for aerospace standard parts ISO 2574, Aircraft Electrical cables Identification marking ISO 8815, Aircraft Electrical cables and cable harnesses Vocabulary IEC 60028:1925, International standard of resistance for copper 3 Terms, Defi
21、nitions and Symbols For the purposes of this document, the terms, definitions and symbols given in ISO 8815 and EN 3475-100 apply. 4 Materials and construction 4.1 Conductors 4.1.1 Materials The individual strands used for the conductors shall be cylindrical and shall be: of nickel clad copper alloy
22、 for nominal cross section of 0,4 mm2; of nickel clad copper for nominal sections 0,6 mm2. The copper shall meet the requirements of IEC 60028 and the copper alloy the requirements of this European Standard. The nickel shall not represent less than 27 % of the total mass of the individual strand. In
23、dividual strands shall show the following minimum breaking strength: 280 N/mm2for nickel clad copper; 315 N/mm2for nickel clad copper alloy. BS EN 2234:2012EN 2234:2012 (E) 5 4.1.2 Lay length Up to 9 mm2cross section inclusive (code 090), concentric or unilay conductors are used. The lay for the str
24、anded conductor, checked over the outside layer of a test piece 1 m long, shall be between 8 times and 16 times the maximum diameter of this conductor. For sectional areas between 14 mm2and 68 mm2(codes 140 to 680), the conductor comprises concentric or bunched conductors twisted together. The lay o
25、f the strands for the basic concentric or bunched conductors shall not exceed 30 times the diameter of the concentric or bunched conductor in question. The lay for concentric (or bunched) conductors, measured over the outer layer of the conductor, shall be between 8 times and 16 times the maximum co
26、nductor diameter. In all cases the lay of the outer layer shall be left-hand. 4.1.3 Joints The conductors shall be free from any joints. Each strand comprising the conductors may, however, include soldered or brazed joints. For strands with a diameter of 0,25 mm or greater, butt joints shall be used
27、. The distance between two joints in individual strands shall exceed 3 m, measured between different strands. 4.1.4 Compaction Compaction of the causing deformation of the strands or damage to the plating is not permitted. 4.2 Construction Finished cables The insulation shall be of a material, which
28、 takes on the circular shape of the conductor throughout its length. It shall closely cover the conductor without adhering to it, so that it reduces the corona effect and the risk of blistering and heat corrosion due to voids and gaseous discharges. The insulation shall be neither too tight nor too
29、loose, so as to provide satisfactory mechanical characteristics and be easily removable using commercially available tools. (See 6.45) The protective sheath shall be of a material, which takes on the round shape of the insulated conductor lying under it. It shall provide adequate protection from mec
30、hanical damage and contamination by liquids, as specified in the product standard. The outer surface shall be smooth and suitable for identification marking. The protective sheath shall not have a corrosive effect on the screen and shall be resistant to fungus and other. 5 Required characteristics T
31、he characteristics of the cables, tested according to the methods described hereafter shall comply with the values given in the product standard. 6 Tests method See Table 1. BS EN 2234:2012EN 2234:2012 (E) 6 Table 1 Tests: methods, application, requirements No. Tests Requirements (and/or particulars
32、) Description EN 3475- (and/or particulars) Qualification1) (Clause 7).aEach delivery Periodic every three years (7.2.4) On allcables(7.2.1and 7.2.2)Priortodeliver6 Test conditions 100 X X X X 6.1 Visual examination 201 3 X Product standard 6.2 Mass 202 minimum length 0,5 m 3 X Product standard 6.3
33、Dimensions 203 3 X X X Product standard 6.4 Ohmic resistance per unit length 301 3 X Product standard 6.5 Voltage proof test: 302 immersion test; 3 X 2,5 Kv r.m.s. dry test; X 5 Kv r.m.s. or dry impulse test. Alternative to dry test X 8 Kv peak voltage 6.6 Insulation resistance 303 3 For 1 km length
34、 at (20 2) C; X 500 M at (95 2) C. X 1 M 6.7 Surface resistance 304 3 Minimum: 1 250 m.mm 6.8 Overload resistance 305T1 and T2: product standard 3 X Applicable to code 006 only 6.9 Continuity of conductors 306 X X Applicable 6.10 Accelerated ageing 401Mandrel diameter and test load: Table 4 3 X 6.11
35、 Shrinkage and delamination 402 bTemperature: product standard 3 X Product standard (continued)BS EN 2234:2012EN 2234:2012 (E) 7 Table 1 Tests: methods, application, requirements (continued) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualification(Clause 7.
36、1).aEach delivery Periodiceverythree years(7.2.4)On allcables(7.2.1and 7.2.2)Priortodeliver6.12 Delamination and blocking 403 Mandrel diameter: Table 4 Temperature: product standard 3 X Product standard 6.13 Thermal shock 404 Temperature: product standard 3 X Product standard 6.14 Bending at ambient
37、 temperature 405 Mandrel diameter: Table 4 3 X 6.15 Cold bend test 406 Mandrel diameter and test load: Table 4 Temperature: product standard 3 X Product standard 6.16 Flammability 407 3 X Product standard 6.17 Fire resistance 408 Per fluid tested 1 X Without fluid immersion for tests prior to delive
38、ry. 6.18 Air-excluded ageing 409 Temperature and time: product standard 3 X 6.19 Thermal endurance 410Temperature and time: product standard X Product standard Applicable to code 006 only. 4 10 samples 6.20 Resistance to fluids 411 Per fluid tested 1 X 6.21 Humidity resistance 412 Method A or B as r
39、equested in product standard 3 X 6.22 Wrap back test 413 3 X Applicable to cables 5 mm26.23 Differential scanning calorimeter (DSC test) 414 3 X 6.24 Rapid change of temperature 415 Not applicable 6.25 Thermal stability 416 Not applicable (continued)BS EN 2234:2012EN 2234:2012 (E) 8 Table 1 Tests: m
40、ethods, application, requirements (continued) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualification(Clause 7.1).aEach delivery Periodiceverythree years(7.2.4)On allcables(7.2.1and 7.2.2)Priortodeliver6.27 Dynamic cut-through 501 Temperature: product stan
41、dard 3 X Product standard 6.28 Notch propagation 502 Cut depth: product standard 3 X 6.29 Scrape abrasion 503 Load : product standard 3 X Requirement to be considered at 20 C unless otherwise specified 6.30 Torsion 504 Test load: Table 4 T3 and T4: product standard 3 X Applicable to 5 mm26.31 Tensil
42、e test on conductors and strands 505 3 X See 4.1 of this standard. 632 Plating continuity 506 3 X 6.33 Adherence of plating 507 3 X 634 Plating thickness 508 3 X 6.35 Solderability 509 3 X Product standard 6.36 Tensile strength and elongation of extruded insulation, sheath and jacket materials 510 4
43、 X Product standard 6.37 Cable-to-cable abrasion 511 1 X Product standard 6.38 Flexure endurance 512 3 X Product standard 6.39 Deformation resistance (Installation with plastic cable ties) 513 Not applicable 6.40 Smoke density 601 X X Product standard 6.41 Toxicity 602 X X Product standard 6.42 Resi
44、stance to wet arc tracking and electric arc propagation 603 X X Product standard 6.43 Resistance to dry arc tracking and electric arc propagation 604 X X Product standard 6.44 Wet short circuit test 605 X X Product standard 6.45 Strippability and adherence of insulation to the conductor 701 3 X Prod
45、uct standard (continued)BS EN 2234:2012EN 2234:2012 (E) 9 Table 1 Tests: methods, application, requirements (concluded) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualification(Clause 7.1).a Each delivery Periodiceverythree years(7.2.4)On allcables(7.2.1and
46、 7.2.2)Priortodeliver6.46 Screen pushback capability 702 NOT APPLICABLE 6.47 Permanence of manufacturers marking 703 3 X Product standard 6.48 Flexibility 704 2 X Product standard 6.49 Contrast measurement 705 and EN 3838 X X Product standard 6.50 Laser markability 706 X X Product standard aNumber o
47、f specimens per cross section for each test unless otherwise specified. 7 Quality assurance 7.1 Qualification 7.1.1 General requirements See EN 9133. 7.1.2 Qualification conditions The cables shall be submitted for qualification tests on drums, spools or in coils in sufficient lengths, wound evenly
48、and uniformly. Each drum, spool or coil shall have a label containing information given in 9.1. 7.1.3 Qualification tests See Table 1. 7.1.4 Extension of qualification The qualification granted may be applicable to adjacent cross-sections in accordance with Table 2 and Table 3. BS EN 2234:2012EN 223
49、4:2012 (E) 10 Table 2 Qualified cables and extension to qualification Single core Qualified cables Cables covered by the same qualification Nominal cross-section AWG a Nominal cross section AWG a mm2mm20,4 22 0,4 22 0,6 20 0,6 to 1 20 to 18 2 14 1,2 to 5 16 to 10 9 8 9 to 34 8 to 2 53 0 42 to 68 1 to 00 aClosest American Wire Gage. For cross-sections 9 mm2 to 68 mm2, different reference cross-sect
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