AECMA PREN 2235-2004 Aerospace series Single and multicore electrical cables screened and jacketed Technical specification Edition P 3《航空航天系列.屏蔽和护套单芯和多芯电缆技术规范》.pdf

1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 31 December 2004 prEN 2235 Edition P 3 December 2004 Comments should be sent within six months after the date of publication to AECMA-STAN PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION d%k? their

2、 surface shall be free from corrosion and other 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.

3、4.3.3.2 Joints Joints in the individual strands of the screen shall be made by soldering or by laying the individual strands together over a length of at least 1 O 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 pus

4、hback capability In accordance with Table 1, test 6.42. 4.3.3.4 Angle of spiral screening or braiding The angle yof spiral screening or braiding (as shown in Figure I), measured against the longitudinal axis of the cable shall be at least IO“. 4.3.3.5 Screen coverage The screen shall have a coverage

5、 pof at least 90 % for spiral screening and at least 85 % for braiding. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 5 prEN 2235:2004 VI Figure

6、 1 - Screen Coverage The cable covering is calculated using the following formula: - for spirals: U=.n(D+d) and S=.n(D+d)tan a F=UZ/U=ndZl.n(D+d)sin a =Fx loo(%) - for braids: U=.n (D+2d) and S=.n (D+2d) tan a For braids, the filling factor F and coverage , taking into account both braiding directio

7、ns and a symmetrical braiding pattern are: F = (U/ u) (Z I 2) = n d I .n (D + 2d) sin a (Z I 2) and = F (2 - F) x 100 (%) where: S = lay length of screen in mm D d = diameter of screen strands in mm N = numberofcores n = number of strands per carriers b = diameter of core in mm Z = total number of c

8、arriers F = filling factor = opticalcoverage U = see Figure 1 U = ndlsina y = Strand angle a = z/2-y = diameter under screen in mm (for cables with 2 or more cores without fillers: D = (Z + N) b I Z) 5 Required characteristics The characteristics of the cables, tested according to the methods descri

9、bed hereafter shall comply with the values given in the product standard. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6 prEN 2235:2004 201 6 T

10、ests methods See Table 1. 3 Table 1 - Tests, methods, application, requirements Tests 302 Alternative to dry - No. - 6 3 X X 303 304 3 3 306 1 X 401 Mandrel 0 and test load: Table 4 Temperature: product standard 3 Each delivery I Requirements (andlor particulars) EN 3475- (andlor particulars) Descri

11、ption Test conditions 100 I x X 6.1 Coverage 13 XI See 4.3.3.5 6.2 - 6.3 l3 See 4.3.3.4 Spiral screening or braiding angle Visual examination Marking: see 8. X 6.4 Mass minimum length: 0,5 202 m I Jroduct standard 6.5 Dimensions (all) outer diameter 3 203 I X Jroduct standard 6.6 - 6.7 301 I 3 Elect

12、rical resistance per length Voltage proof test: - immersion test - drytest - dry impulse test Jroduct standard 500 V a.c. 1 kV a.c. 1,5 kV a.c. peak voltage 1,5 kV a.c. X X test I - dielectric strength of cores 6.8 - 6.9 -or a length of 1 km: Insulation resistance at (20 f 2) “C: - drytest - immersi

13、on test at (95 f 2) “C: - immersion test Surface resistance 1 500 MO 500 MO I5 MO Minimum: 1 250 MO.mm 6.10 Overload resistance 305 I Not applicable 6.11 - 6.12 Continuity of conductors Corona extinction voltage Not applicable 307 I 6.13 Accelerated ageing 6.14 Shrinkage and delamination Temperature

14、: product 402 standard I I Jroduct standard (continued) Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 7 prEN 2235:2004 Description Table 1 - Tes

15、ts, methods, application, requirements (continued) C mb s? (andlor oa Ra - me o EN 3475- particulars) - No. - 6.15 3elamination and locking Tests 403 3 Mandrel 0 Table 4 Temperature: product standard Tensile test on :onductors and strands Jlating continuity 4dherence of plating Jlating thickness Sol

16、derability of screen 505 3 X 506 1 X 507 1 508 1 X 509 3 X Each delivery Requirements (andlor particulars) X 6.16 Thermal shock 3 I Productyandard I Ix +educt standard 6.17 - 6.18 3ending at ambient :old bend test Mandrel 0 and test load Table 4 X 6.19 6.20 - I Not applicable X =lammability 407 3 =i

17、re resistance 408 +educt standard 6.21 ir-excluded ageing I 409 I Not applicable 6.22 6.23 - Thermal endurance 41 O Not applicable :o fluids iesistance of jacket 41 1 1 per fluid X 6.24 iumidity resistance I 412 I Not applicable 6.25 Nrap backtest I 413 I Not applicable 6.26 - 6.27 3ferential scanni

18、ng 414 Not applicable :alorimeter test :DSC) iapid change of 415 Not applicable :emperature 6.28 Thermal stability I 416 I Not applicable 6.29 6.30 - 3ynamic cut-through 50 1 Not applicable Votch propagation 502 3 X Cut depth: product standard 6.31 X -or screened only 3equirements to be :onsidered a

19、t 20 “C inless otherwise specified Scrape abrasion 503 3 Load: product standard 6.32 6.33 - 6.34 Strands of screened cables 6.35 Strands of screened cables 6.36 - 6.37 Strands of screened cables and product standard +educt standard (continued) Copyright Association Europeene des Constructeurs de Mat

20、eriel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 8 prEN 2235:2004 512 I Not applicable Table 1 - Tests, methods, application, requirements (continued) Tests I - No. - 6.38 513 601 602 603 604 Not applica

21、ble C Product standard Product standard C Not applicable Not applicable 701 702 703 3 X 3 X 3 X 704 EN 3838 705 -aser parameters: Not applicable X X Product standard 1 X Product standard I Eachdelivery I Requirements (andlor particulars) EN 3475- (andlor particulars) Description Tensile strength and

22、 elongation of extruded insulation, sheath and jacket material Not applicable 510 6.39 Cable-to-ca ble abrasion Not applicable 511 I 6.40 Flexure endurance 6.41 Deformation resistance 6.42 Smoke density 6.43 6.44 - - 6.45 Toxicity Resistance to wet arc tracking Resistance to dry arc tracking 6.46 -

23、6.47 605 I Not applicable Damp short circuit test Strippability and adherence of jacket 6.48 Braid screen Dushback caDabilitv 6.49 - 6.50 Permanence of manufacturers marking Flexibility 6.51 Permanence of user- applied marking Contrast measurement 6.52 Capacitance per unit length 6.53 Capacitance un

24、balance (within one pair) 802 I Not applicable 6.54 Capacitance variation Not applicable 803 I 6.55 Velocity of propagation Not applicable 804 I 6.56 Characteristic impedance Not applicable 805 I 6.57 Attenuation 806 I Not applicable I 6.58 Transfer impedance 807 I 1 I 6.59 Cross-talk 808 I Not appl

25、icable I a Number of specimens per cross-section for each test unless otherwise specified Single core screened cables of nominal cross-section 0,6 mm2 only To be agreed between the manufacturer and the user Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS und

26、er license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 9 prEN 2235:2004 Number of conductors 3 3 1 2 7 Quality assu rance 7.1 Qual if cat ion 7.1.1 General requirements See EN 9133. 7.1.2 Qualification conditions The cables shall be submitted for

27、 qualification 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. 7.1.4 Extension of qualification The qualification granted may be applicable to

28、 adjacent cross section in accordance with Table 2. Table 2 - Qualified cables and extension of qualification AWG a Nominal cross-section AWG a mm2 mm2 0,15 26 0,25 24 0,25 24 0,15 26 0,6 20 0,4 to 1 22 to 18 2 14 1,2 to 5 16 to 10 Nominal cross-section Qualified cables Cables covered by the same qu

29、alification I a Closest American Wire Gage 7.2 Acceptance test 7.2.1 Required conditions See Table 1. The acceptance tests shall be carried out on cables delivered against an order to check that the cable characteristics are maintained. 7.2.1.1 The cables which fail any of the tests specified in 7.2

30、.2 shall be rejected. Tests to be carried out on all cables 7.2.1.2 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

31、new specimens fails the test, the batch submitted for acceptance shall be rejected. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 10 prEN 2235:2

32、004 Nominal cross-section of cable mm2 035 to 1 1,2 to 5 7.2.2 Production routine tests The tests shall be carried out on all cables delivered. See Table 1. Minimum acceptable Minimum acceptable continuous lengths for continuous lengths for at least 85 % of cables not more than 15 % of AWG a deliver

33、ed cables delivered m m 26 to 18 1 O0 30 16 to 10 80 20 7.2.3 Tests prior to delivery They shall be carried out by sampling on each delivery batch. See Table 1. 7.2.4 Periodic tests They shall be carried out by sampling at least every three years. See Table 1. 8 Identification marking Unless otherwi

34、se specified, a core or the jacket shall be marked indelibly with the type, cross section and a reference for identification of country of origin, manufacturer and year of manufacture in accordance with IS0 2574. 9 Packaging, labelling and delivery lengths 9.1 Packaging and labelling Cables supplied

35、 on drums, spools or in coils shall be wound evenly and uniformly. All cable ends shall be easily accessible and protected where necessary. Each drum, spool or coil shall have a label indicating: - manufacturers name and designation; - cable designation according to the EN product standard; - batch

36、number; - date of manufacture (month, year); - inspectors mark; - total length and length of each piece of cable in metres from inside to outside. 9.2 Delivery lengths They shall conform to Table 3 unless otherwise specified. Copyright Association Europeene des Constructeurs de Materiel Aerospatial

37、Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 11 prEN 2235:2004 Mandrel diameter mm Code Test load N I O0 1 1 132 I 002 18 16 I 004 3 5 I 006 12 10 I 020 Table 4 - Mandrel diameter and test load Nominal cross-section o

38、f conductor mm2 AWG a 0,15 I 26 0,25 I 24 0,4 22 0,6 I 20 2 I 14 I 7 I 9 :u 12 times the maximum cable diameter I 15 I a Closest American Wire Gage Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-