ASD-STAN PREN 2235-2013 Aerospace series Single and multicore electrical cables screened and jacketed Technical specification (Edition P 4).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2235 Edition P 4 December 2013 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONRue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes edition P 3 of Decem

2、ber 2004 and will supersede EN 2235:2006Descriptors: ENGLISH VERSION Aerospace series Single and multicore electrical cables, screened and jacketed Technical specification Srie arospatiale Cbles lectriques, mono et multiconducteurs, blinds et gains Spcification technique Luft- und Raumfahrt Ein- und

3、 mehradrige geschirmte und ummantelte elektrische Leitungen Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the Eur

4、opean Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, wit

5、hout re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national

6、 members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st December 2013 Comments should be sent within six months after the date of publication to

7、 ASD-STAN Electrical Domain Copyright 2013 by ASD-STAN prEN 2235:2013 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions . 3 4 Materials and construction of cables 3 5 Required characteristics . 6 6 Testsmethods. 6 7 Quality assurance 10 8 Identification markin

8、g 12 9 Packaging, labelling and delivery lengths . 12 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has

9、received approval for Publication. prEN 2235:2013 (E) 3 1 Scope This standard specifies the required characteristics, test methods, qualification and acceptance conditions of single and multicore cables, screened, jacketed and multicore jacketed cables for use in aircraft electrical systems. 2 Norma

10、tive 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 references, the latest edition of the referenced document (including any amendments)

11、applies. EN 2083, Aerospace series Copper or copper alloy conductors for electrical cables Product standard EN 2084, Aerospace series Cables, electrical, general purpose, with conductors in copper or copper alloy Technical specification EN 3475-100 (all parts), Aerospace series Cables, electrical, a

12、ircraft use Test methods Part 100: General EN 3838, Aerospace series Requirements and tests on 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, Aer

13、ospace 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 3 Terms and definitions For the purposes of this document, the terms and defin

14、itions given in ISO 8815 and EN 3475-100 apply. 4 Materials and construction of cables 4.1 General 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 Gen

15、eral The permissible operating temperature of conductors shall not be lower than the maximum operating temperature of the cable as a whole. prEN 2235:2013 (E) 4 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 th

16、e cabled cores. The core shall not be spliced. Where filler cores are used, this shall 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 othe

17、r contamination. They shall satisfy the mechanical tests in EN 3475-505 to EN 3475-508 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 strand

18、s of the screen shall be made by soldering or by laying the individual strands together 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, te

19、st 6.48. 4.3.3.4 Angle of spiral screening or braiding The angle of spiral screening 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 lea

20、st 85 % for braiding. prEN 2235:2013 (E) 5 Figure 1 Screen coverage The 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-covere

21、d area is 2 mm, and the relative aperture (versus lay length) of the screening 100 T/L shall be less than 5 %. Figure 2 prEN 2235:2013 (E) 6 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

22、2d) sin (Z / 2) and F (2 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 ca

23、rriers; 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 1. Tabl

24、e 1 Tests, methods, application, requirements (1 of 4) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualification a(see 7.1).First article (see 7.1.5)Each delivery Periodic every three years (7.2.4)On all cables (7.2.1 and 7.2.2)Priorto delivery (7.2.1 and 7.

25、2.2)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. prEN 2235:2013 (E) 7 Table 1 Tests, methods, application, requirements (2 of 4) No. Tests Requirements (and/or

26、 particulars) Description EN 3475- (and/or particulars) Qualification a(see 7.1).First article (see 7.1.5)Each delivery Periodic every three years (7.2.4)On all cables (7.2.1 and 7.2.2)Priorto delivery (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) ou

27、ter 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 a

28、.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

29、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: Ta

30、ble 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 prEN 2235:2013 (E) 8 Table 1 Tests, methods, application, requirements (3 of 4) No. Tests Requirements (and/or particulars) Des

31、cription EN 3475- (and/or particulars) Qualification a(see 7.1).First article (see 7.1.5)Each delivery Periodic every three years (7.2.4)On all cables (7.2.1 and 7.2.2)Priorto delivery (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 X Pr

32、oduct 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 calo

33、rimeter (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 Load

34、: 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 Appl

35、icable 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 and

36、 jacket material 510 Not applicable 6.39 Cable-to-cable abrasion 511 Not applicable prEN 2235:2013 (E) 9 Table 1 Tests, methods, application, requirements (4 of 4) No. Tests Requirements (and/or particulars) Description EN 3475- (and/or particulars) Qualification a(see 7.1).First article (see 7.1.5)

37、Each delivery Periodic every three years (7.2.4)On all cables (7.2.1 and 7.2.2)Priorto delivery (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 Toxicity 602

38、 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 X X X 6

39、.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 (within o

40、ne 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 specimens per

41、 cross-section for each test unless otherwise specified. bSingle core screened cables of nominal cross-section 0,6 mm2 only. prEN 2235:2013 (E) 10 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 c

42、able diameter 5 002 0,25 24 7 004 0,4 22 9 006 0,6 20 10 010 1 18 10 012 1,2 16 10 020 2 14 15 030 3 12 15 050 5 10 15 a AWG: Closest American Wire Gage. 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 qua

43、lification tests on drums, spools or in coils in sufficient lengths, wound evenly 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. prEN 2235:2013 (E) 11 7.1.4 Extension of qualification The qualification granted ma

44、y be applicable to adjacent cross section in accordance with Tables 3 and 4. Table 3 Qualified cables and extension of qualification up to 4 conductors Number of conductors Qualified cables Cables covered by the same qualification Nominal cross-section AWG a Nominal cross-section AWG amm2mm23 0,15 2

45、6 0,25 24 3 0,25 24 0,15 261 0,6 20 0,4 to 1 22 to 18 2 2 14 1,2 to 5 16 to 10 aAWG: Closest American Wire Gage. Table 4 Qualified cables and extension of qualification from 5 conductors and above Number of conductors Qualified cables Cables covered by the same qualification Nominal cross-section AW

46、G a Nominal cross-section AWG amm2mm25 0,15 24 0,15 to 5 26 to 10 aAWG: Closest American Wire Gage. 7.1.5 First article inspection The first article inspection tests are to be carried out on all cable designs that were not included in the qualification demonstration. See Table 1. 7.2 Acceptance test

47、 7.2.1 Required conditions 7.2.1.1 General The acceptance tests shall be carried out on cables delivered against an order to check that the cable characteristics are maintained. See Table 1. 7.2.1.2 Tests to be carried out on all cables The cables which fail any of the tests specified in 7.2.1 shall

48、 be rejected. prEN 2235:2013 (E) 12 7.2.1.3 Random sampling tests: retest If any of the specimens fails one the tests specified in 7.2.3, that test shall be repeated on another set of specimens of the same cross-section selected at random from the same batch. If one of these new specimens fails the

49、test, the batch submitted for acceptance shall be rejected. 7.2.2 Production routine tests The tests shall be carried out on all cables delivered. See Table 1. 7.2.3 Tests prior to delivery They shall be carried out by sampling on each inspection batch. See Table 1. 7.2.4 Periodic tests They shall be carried out by sampli