1、BSI Standards PublicationBS EN 2235:2015Aerospace series Single andmulticore electrical cables,screened and jacketed Technical specificationBS EN 2235:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 2235:2015. Itsupersedes BS EN 2235:2006 which is withdrawn
2、.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optic techn.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovis
3、ions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 87664 6ICS 49.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published unde
4、r the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS EN 2235:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2235 August 2015 ICS 49.060 Supersedes EN 2235:2006English Version Aerospace series - Single and mu
5、lticore electrical cables, screened and jacketed - Technical specification Srie arospatiale - Cbles lectriques, mono et multiconducteurs, blinds et gains - Spcification technique Luft- und Raumfahrt - Ein- und mehradrige geschirmte und ummantelte elektrische Leitungen - Technische Lieferbedingungen
6、This European Standard was approved by CEN on 29 November 2014. CEN members are bound 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 re
7、ferences concerning such national standards may be obtained on application to the CEN-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
8、CEN member into its own language and notified to the CEN-CENELEC Management Centre has 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, Former Yugoslav Republic of Macedo
9、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROP
10、ISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2235:2015 EBS EN 2235:2015EN 2235:2015 (E) 2 Contents Page European foreword .3 1 Scope
11、 4 2 Normative references 4 3 Terms and definitions .4 4 Materials and construction of cables 4 5 Required characteristics .7 6 Tests methods 7 7 Quality assurance . 11 8 Identification marking . 13 9 Packaging, labelling and delivery lengths 13 BS EN 2235:2015EN 2235:2015 (E) 3 European foreword Th
12、is document (EN 2235:2015) 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 Associations and th
13、e 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 2016, and conflicting national standards shall be wit
14、hdrawn at the latest by February 2016. This document supersedes EN 2235:2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Accordin
15、g to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Gr
16、eece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 2235:2015EN 2235:2015 (E) 4 1 Scope This European Standard specifies the required charact
17、eristics, test methods, qualification and acceptance conditions of single and multicore cables, screened, jacketed and multicore jacketed cables for use in aircraft electrical systems. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document an
18、d are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2083, Aerospace series Copper or copper alloy conductors for electrical cables Product standard
19、EN 2084, Aerospace series Cables, electrical, single-core, general purpose, with conductors in copper or copper alloy Technical specification EN 3475-100 (all parts), Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3838, Aerospace series Requirements and tests on
20、user-applied markings on aircraft electrical cables EN 4434, Aerospace series Copper or copper alloy lightweight conductors for electrical cables Product standard (Normal and tight tolerances) EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts I
21、SO 2574, Aircraft Electrical cables Identification marking ISO 8815, Aircraft Electrical cables and cable harnesses Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8815 and EN 3475-100 apply. 4 Materials and construction of cables 4.1 Gene
22、ral The individual cores shall be qualified to EN 2083 or EN 4434, EN 2084 and the product standards. 4.2 Materials The materials shall conform to the product standard. 4.3 Construction of cables 4.3.1 General The permissible operating temperature of conductors shall not be lower than the maximum op
23、erating temperature of the cable as a whole. BS EN 2235:2015EN 2235:2015 (E) 5 4.3.2 Cabled cores The lay length of the outer lay shall not be less than eight times and not more than 16 times the nominal diameter of the cabled cores. The core shall not be spliced. Where filler cores are used, this s
24、hall be specified in the product standard. 4.3.3 Screened cables 4.3.3.1 General The individual strands used for the screen shall be free from kinks, loops or breaks; their surface shall be free from corrosion and other contamination. They shall satisfy the mechanical tests in EN 3475-505 to EN 3475
25、-508 before use. The screen shall be in contact with all the cabled cores. Where spiral screening is used, the lay direction shall be contrary to that of the cabled cores. 4.3.3.2 Joints Joints in the individual strands of the screen shall be made by soldering or by laying the individual strands tog
26、ether over a length of at least 10 mm. There shall be no more than one joint per 3 m cable length (measured between different individual strands). 4.3.3.3 Braid screen pushback capability In accordance with Table 1, test 6.48. 4.3.3.4 Angle of spiral screening or braiding The angle of spiral screeni
27、ng or braiding (as shown in Figure 1), measured against the longitudinal axis of the cable shall be at least 10. 4.3.3.5 Screen coverage The screen shall have a coverage of at least 90 % for spiral screening and at least 85 % for braiding. BS EN 2235:2015EN 2235:2015 (E) 6 Figure 1 Screen coverage T
28、he cable covering is calculated using the following formula: for spirals: U = (D + d) and S = (D + d) tan F = U Z / U = n d Z / (D + d) sin = F 100 (%) for braids: U = (D + 2d) and S = (D + 2d) tan For spiral screen: the maximum length T of the non-covered area is 2 mm, and the relative aperture (ve
29、rsus lay length) of the screening 100 T/L shall be less than 5 %. Figure 2 BS EN 2235:2015EN 2235:2015 (E) 7 For braids, the filling factor F and coverage , taking into account both braiding directions and a symmetrical braiding pattern are: F = (U/ U) (Z / 2) = n d / (D + 2d) sin (Z / 2) and = F (2
30、 F) 100 (%) where S = lay length of screen in mm; D = diameter under screen in mm (for cables with 2 or more cores without fillers: D = ( + N) b / ); d = diameter of screen strands in mm; N = number of cores; n = number of strands per carriers; b = diameter of core in mm; Z = total number of carrier
31、s; F = filling factor; = optical coverage; U = see Figure 1; U = n d / sin ; = strand angle; = /2 . 5 Required characteristics The characteristics of the cables, tested according to the methods described hereafter shall comply with the values given in the product standard. 6 Tests methods See Table
32、1. Table 1 Tests, methods, application, requirements (1 of 4) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualificationa(see 7.1).Firstarticle(see 7.1.5)Each delivery Periodiceverythree years(7.2.4)On allcables(7.2.1 and 7.2.2)Priortodelivery(7.2.1 and 7.2.2
33、)6 Test conditions 100 X X X X X 6.1 Coverage X X X See 4.3.3.5. 6.2 Spiral screening or braiding angle X X X See 4.3.3.4. 6.3 Visual examination 201 X X X Marking: according to Clause 8. BS EN 2235:2015EN 2235:2015 (E) 8 Table 1 Tests, methods, application, requirements (2 of 4) No. Tests Requireme
34、nts (and/or particulars) Description EN 3475- (and/or particulars) Qualificationa(see 7.1).Firstarticle(see 7.1.5)Each delivery Periodiceverythree years(7.2.4)On allcables(7.2.1 and 7.2.2)Priortodelivery(7.2.1 and 7.2.2)6.4 Mass 202 minimum length: 0,5 m X X X Product standard 6.5 Dimensions (all) o
35、uter diameter 203 X X X X Product standard 6.6 Ohmic resistance per unit length 301 X X X Product standard 6.7 Voltage proof test: 302 immersion test; X X 500 V a.c. dry test; X 1 kV a.c. dry impulse test; Alternative to dry test X X X 1,5 kV a.c. peak voltage dielectric strength of cores. X 1,5 kV
36、a.c. 6.8 Insulation resistance at (20 2) C: 303 X X For a length of 1 km: dry test; X 1 500 M immersion test at (20 2) C. X 500 M at (95 2) C: X 15 M immersion test X 15 M 6.9 Surface resistance 304 X Minimum: 1 250 M.mm 6.10 Overload resistance 305 Not applicable 6.11 Continuity of conductors 306 X
37、 X X 6.12 Corona extinction voltage 307 Not applicable 6.13 Accelerated ageing 401 Mandrel diameter and test load: Table 2 Temperature: product standard X X 6.14 Shrinkage and delamination 402 Temperature: product standard X X X Product standard 6.15 Delamination and blocking 403 Mandrel diameter: T
38、able 2 Temperature: product standard X X X 6.16 Thermal shock 404 Product standard X X X Product standard 6.17 Bending at ambient temperature 405 Mandrel diameter: Table 2 X BS EN 2235:2015EN 2235:2015 (E) 9 Table 1 Tests, methods, application, requirements (3 of 4) No. Tests Requirements (and/or pa
39、rticulars) Description EN 3475- (and/or particulars) Qualificationa(see 7.1).Firstarticle(see 7.1.5)Each delivery Periodiceverythree years(7.2.4)On allcables(7.2.1 and 7.2.2)Priortodelivery(7.2.1 and 7.2.2)6.18 Cold bend test 406 Mandrel diameter and test load: Table 2 X X X 6.19 Flammability 407 X
40、X Product standard 6.20 Fire resistance 408 Not applicable 6.21 Air-excluded ageing 409 Not applicable 6.22 Thermal endurance 410 Not applicable 6.23 Resistance to fluids 411 1 per fluid X b6.24 Humidity resistance 412 Not applicable 6.25 Wrap back test 413 Not applicable 6.26 Differential scanning
41、calorimeter (DSC test) 414 Applicable for PTFE jackets only 6.27 Rapid change of temperature 415 Not applicable 6.28 Thermal stability 416 Not applicable 6.29 Dynamic cut-through 501 Applicable single conductor only 6.30 Notch propagation 502 Cut depth: product standard X X 6.31 Scrape abrasion 503
42、Load: product standard X For screened only requirements to be considered at 20 C unless otherwise specified 6.32 Torsion 504 Not applicable 6.33 Tensile test on conductors and strands 505 X X Applicable on raw material and on finished cable 6.34 Plating continuity 506 X X Strands of screened cables
43、Applicable on raw material and on finished cable 6.35 Adherence of plating 507 X X Strands of screened cables 6.36 Plating thickness 508 X X Strands of screened cables and product standard 6.37 Solderability 509 X X Product standard 6.38 Tensile strength and elongation of extruded insulation, sheath
44、 and jacket material 510 Not applicable 6.39 Cable-to-cable abrasion 511 Not applicable BS EN 2235:2015EN 2235:2015 (E) 10 Table 1 Tests, methods, application, requirements (4 of 4) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualificationa(see 7.1).Firstart
45、icle(see 7.1.5)Each delivery Periodiceverythree years(7.2.4)On allcables(7.2.1 and 7.2.2)Priortodelivery(7.2.1 and 7.2.2)6.40 Flexure endurance 512 Not applicable 6.41 Deformation resistance (Installation with plastic cable ties) 513 Not applicable 6.42 Smoke density 601 X Product standard 6.43 Toxi
46、city 602 X Product standard 6.44 Resistance to wet arc tracking 603 Not applicable 6.45 Resistance to dry arc tracking 604 Not applicable 6.46 Wet short circuit test 605 Not applicable 6.47 Strippability and adherence of insulation to the conductor 701 X X X 6.48 Braid screen pushback capability 702
47、 X X X 6.49 Permanence of manufacturers marking 703 X X 6.50 Flexibility 704 Not applicable 6.51 Permanence of user-applied marking EN 3838 X X Product standard Contrast measurement 705 Laser parameters: 706 X X Product standard 6.52 Capacitance per unit length 801 X X X 6.53 Capacitance unbalance (
48、within one pair) 802 Not applicable 6.54 Capacitance variation 803 Not applicable 6.55 Velocity of propagation 804 Not applicable 6.56 Characteristic impedance 805 Not applicable 6.57 Attenuation 806 Not applicable 6.58 Transfer impedance 807 X X X 6.59 Cross-talk 808 Not applicable aNumber of speci
49、mens per cross-section for each test unless otherwise specified. bSingle core screened cables of nominal cross-section 0,6 mm2 only. BS EN 2235:2015EN 2235:2015 (E) 11 Table 2 Mandrel diameter and test load Code Nominal cross-section of conductor AWG aMandrel diameter Test load mm2mm N 001 0,15 26 12 times the maximum cable diameter 5 002 0,25 24 7 004 0,4 22 9 006 0,6 20 10 010 1 18
