1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD AEROSPACE SERIES BS 3G 23
2、0:2000 Incorporating Corrigendum No. 1 ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for general requirements for aircraft electrical cables (second series)This British Standard, having been prepared under the direction of the Engineering Sector Comm
3、ittee, was published under the authority of the Standards Committee and comes into effect on 15 May 2000 BSI 21 December 2001 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 94/704894 DC ISBN 0 580 33147 4 BS 3G 230:2000 Amendments issued
4、 since publication Amd. No. Date Comments 13474 Corrigendum No.1 21 December 2001 Correction to 7.32.2, equation (2) Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic tec
5、hnology, upon which the following bodies were represented: British Airways British Cable Makers Confederation Civil Aviation Authority Federation of the Electronics Industry Ministry of Defence Society of British Aerospace Companies Ltd.BS 3G 230:2000 BSI 21 December 2001 i Contents Foreword i 1 Sco
6、pe 1 2 Normative references 1 3 Definitions 2 3.1 Individual cable specification 2 3.2 Approval authority 2 4 Classification and colour coding 3 4.1 Classification 3 4.2 Colour coding 3 5 Designation and marking 4 5.1 Designation 4 5.2 Circuit identification 5 6 Packaging and labelling 5 7 Tests 5 7
7、.1 General 5 7.2 Test 1. Appearance and identification of finished cable 6 7.3 Test 2. Mass per unit length of finished cable 6 7.4 Test 3. Conductor composition 7 7.5 Test 4. Visual examination of strands 7 7.6 Test 5. Insulation thickness and concentricity 7 7.7 Test 6. Core and cable outer diamet
8、ers 7 7.8 Test 7. Tensile strength and elongation at break of copper or copper alloy conductors 7 7.9 Test 8. Tensile strength and elongation at break of aluminium or aluminium alloy conductors 8 7.10 Test 9. Strand plating continuity 8 7.11 Test 10. Strand plating adherence 8 7.12 Test 11. Strand p
9、lating thickness 9 7.13 Test 12. Electrical resistance of copper or copper alloy conductors 9 7.14 Test 13. Electrical resistance of aluminium or aluminium alloy conductors 9 7.15 Test 14. Solderability 9 7.16 Test 15. Conductor strand adhesion 11 7.17 Test 16. High voltage 12 7.18 Test 17. Insulati
10、on resistance 15 7.19 Test 18. Surface resistance 15 7.20 Test 19. Accelerated ageing 16 7.21 Test 20. Thermal endurance 16 7.22 Test 21. Adherence of insulation on conductor 17 7.23 Test 22. Delamination and shrinkage 17 7.24 Test 23. Delamination and insulation blocking 17 7.25 Test 24. Room tempe
11、rature bend 18 7.26 Test 25. Cold bend (not applicable to size 4 and larger) 18 7.27 Test 26. Dynamic cut-through (not applicable to size 8 and larger) 18 7.28 Test 27. Notch-propagation resistance 19 7.29 Test 28. Flammability 19 7.30 Test 29. Resistance to fluids 21 7.31 Test 30. Scrape abrasion (
12、not applicable to size 8 and larger) 22BS 3G 230:2000 ii BSI 21 December 2001 7.32 Test 31. Overload resistance 23 7.33 Test 32. Delamination (not applicable to size 8 and larger) 24 7.34 Test 33. Fire resistance 25 7.35 Test 34. Air-excluded ageing (applicable to silicone rubber insulations only) 2
13、5 7.36 Test 35. Climatic 25 7.37 Test 36. Identification durability (not applicable to size 8 and larger) 25 7.38 Test 37. Cable to cable abrasion 26 7.39 Test 38. Pliability 26 7.40 Test 39. Colour fastness to light 28 7.41 Test 40. Current rating 28 7.42 Test 41. Toxicity 32 7.43 Test 42. Resistan
14、ce towet arc tracking 32 7.44 Test 43. Resistance to dry arcing 35 7.45 Test 44. Tensile strength and elongation of insulation 40 7.46 Test 45. Test for hydrolysis 41 7.47 Test 46. Test for flexure endurance 41 7.48 Test 47. Sheath durability 42 Annex A (normative) Formulae for calculating braiding
15、details 62 Annex B (normative) Identification marks 64 Annex C (normative) Relative thermal life and temperature rating 65 Annex D (normative) Formulae for the calculation of resistance of conductors for use in aircraft electrical cables 77 Figure 1 Typical force/time trace for solderability test 43
16、 Figure 2 Miniature bead-chain electrode head for dry impulse test 44 Figure 3 Preparation of specimen for surface resistance test 45 Figure 4 Chamber for surface resistance test 45 Figure 5 Adherence of insulation test 46 Figure 6 Typical cutting edge for dynamic cut-through test 46 Figure 7 Notch-
17、propagation test blade holder 47 Figure 8 General arrangement of apparatus for flammability test (method 1) 48 Figure 9 General arrangement of apparatus for flammability test (method 2) 49 Figure 10 General arrangement for scrape abrasion test 50 Figure 11 Abrasion test rig 51 Figure 12 Pliability t
18、est rig (method 1) 52 Figure 13 Pliability test rig (method 2) 53 Figure 14 Oven and associated equipment for current rating tests 53 Figure 15 Resistance to wet arc tracking : electrical connections 54 Figure 16 Resistance to wet arc tracking : test configuration 55 Figure 17 Method of attachment o
19、f cable test specimen to mandrel 56 Figure 18 Dry arc cable bundle lay up 57 Figure 19 Dry arc test schematic circuit 57 Figure 20 Schematic representation of dry arc test apparatus 58 Figure 21 Blade details 59 Figure 22 Flexure endurance test schematic 60 Figure 23 Accelerated ageing test rig (sch
20、ematic) 61 Figure C.1 Model Arrhenius plot 76BS 3G 230:2000 BSI 21 December 2001 iii Table 1 List of test fluids 22 Table 2 Flexure endurance 42 Table B.1 Manufacturers identification marks 64 Table C.1 Mandrel diameters 66 Table C.2 Additional mandrel diameters and masses 67 Table C.3 Recommended e
21、xposure times in days per cycle 69 Table C.4 Sample calculations 74 Table C.5 Commonly used test temperatures in C and the corresponding kelvins with its reciprocal and reciprocal squared values (see Table C.3) 75 Table D.1 Plating factor 78 Table D.2 Copper wire conductivity for nickel plating thic
22、kness of 2 microns 79BS 3G 230:2000 iv BSI 21 December 2001 Foreword The revision of this British Standard has been prepared by Subcommittee ACE/6/2, Aerospace- Cables, on behalf of Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology. It supersedes BS 2G 230: 1991 whi
23、ch is withdrawn. This edition embodies the text of amendment No 1 (AMD 7066) and the draft amendment No 2. It introduces revised titles for tests, revised requirements for tests and introduces additional tests. The revised tests bring the specification into line with proposed future European Standar
24、ds that will, in due course, supersede some of the tests listed herein. This edition also takes into account developments in the revision of ISO 2635: 1979 which will be reflected in a future revision of BS G 231:1997. However, smoke production under current overload conditions is addressed in the t
25、ext for overload resistance. This revision of the standard does not include requirements or tests for the determination of smoke density or toxicity as European Standards for these tests are still under development at time of preparation of this standard. This standard forms the basis on which a ser
26、ies of individual cable specifications, e.g. BS G 232, have been prepared. The individual specifications should therefore be considered as the definitive standards. It is assumed in this British Standard that the execution of its provisions is entrusted to qualified and experienced people, for whose
27、 guidance it has been prepared. Formulae for calculating braiding details are specified in annex A and revised manufacturers identification marks are specified in annex B. WARNING This British Standard calls for the use of substances and procedures that may be injurious to health if adequate precaut
28、ions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Relative thermal life and temperature rating specified in annex C has been reproduced from ASTM D 3032-80, with permission, and formulae for ca
29、lculating conductor resistance are specified in annex D. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 79 and a back cover. The BSI copyright displ
30、ayed in this document indicates when the document was last issued.BS 3G 230:2000 BSI 21 December 2001 1 1 Scope This British Standard specifies requirements and describes methods of test common to aerospace series electrical cable specifications. 2 Normative references The following normative docume
31、nts contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS
32、 903-A16:1987, Physical testing of rubber Determination of the effect of liquids (ISO 1817) BS 1595-1:1986, Propan-2-ol (isopropyl alcohol) for industrial use Specification for Propan-2-ol (isopropyl alcohol) BS 2011-2.1T:1981, Environmental testing 1T. Test T. Soldering BS 2782-5: Method 540B:1982,
33、 Methods of testing plastics Methods of exposure to laboratory light sources (xenon arc lamp, enclosed carbon arc lamp, open-flame carbon arc lamp, fluorescent tube lamps) BS 3591:1985, Specification for industrial methylated spirits BS 5099:1992, Specification for spark testing of electric cables B
34、S 6746C:1993, Colour chart for insulation and sheath of electric cables BS 3G 100-1:1973, Specification for general requirements for equipment for use in aircraft. Identification and declarations BS 3G 100-2.3.12:1991, Specification for general requirements for equipment for use in aircraft All equi
35、pment Environmental conditions Fluid contamination BS 3G 100-2.3.13:1973, Specification for general requirements for equipment for use in aircraft All equipment Resistance to fire in designated fire zones BS 3G 100-3:1979, Specification for general requirements for equipment for use in aircraft All
36、equipment Characteristics of aircraft electrical power supplies BS 4G 229:1996, Schedule for environmental conditions and test procedures for airborne equipment (Implementation of ISO 7137) BS 3G 231:1997, Specification for conductors for general-purpose aircraft electrical cables and aerospace appl
37、ications BS G 250:1994, Specification for identification marking of electric cables (Implementation of ISO 2574)BS 3G 230:2000 2 BSI 21 December 2001 BS G 258:1995, Glossary of terms for electrical cables and cable harness (implementation of ISO 8815) BS G 262:1998, Aircraft. Declaration of design a
38、nd performance for aircraft equipment. Standard form (ISO/TR 224:1998) BS 2L 93:1971, Specification for plate of aluminium-copper-magnesium-silicon-manganese alloy (solution treated, controlled stretched and precipitation treated) (Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8) BS EN ISO 3166, Codes for the repres
39、entation of names of countries and their subdivisions Country subdivision codes ASTM D 3032-80, Hookup wire insulation Mil-C-5809, General specification for aircraft circuit breaker trip-free Mil-T-43435-B, Specification for tape lacing and tying 3 Definitions For the purposes of this British Standa
40、rd, the definitions given in BS G 258:1995 apply, together with the following. 3.1 individual cable specification technical specification, product standard or a combination of the two (e.g. as used in the case of European Standards) which define specific requirements relating to a cable product type
41、 3.2 approving authority body which is recognized by the CAA, for civil aviation products, or MOD, for military products, (or their accredited representatives), which can confer approval for a product to be used on aircraft built in the UKBS 3G 230:2000 BSI 21 December 2001 3 4 Classification and co
42、lour coding NOTE Details of conductors, insulation, screens, glass braids and jackets are specified in individual cable specifications. The formulae for calculating the filling factor and lay factor of screens and glass braids are specified in annex A. 4.1 Classification The cables in an individual
43、range shall be classed according to the number of cores they possess, e.g.: class 1: single core; class 2: two core; class 3: three core; class 4: four core. 4.2 Colour coding 4.2.1 General Where applicable, the colours shall be recognizable as those specified in BS 6746C. 4.2.2 Class 1 cables and s
44、heaths Class 1 cables and sheaths shall be white in accordance with BS G 250 (ISO 2574). 4.2.3 Classes 2, 3 and 4 Each core of a multi-core cable shall be colour coded as specified in BS G 250 (ISO 2574). One of the following methods shall be used to colour identify the cables.a) The cable insulatio
45、n surface shall be completely coloured to show the base colour. Where a second colour is required, this shall be in the form of a helical stripe approximately 0.75 mm wide applied with a lay length of approximately 12 times the cable diameter.b) The base colour shall be applied in a helical stripe n
46、ot less than 1.5 mm wide with a lay length of approximately 12 times the cable diameter. Where a second colour is required, this shall be applied in a helical stripe of the same lay length, but approximately 0.75 mm wide.BS 3G 230:2000 4 BSI 21 December 2001 5 Designation and marking 5.1 Designation
47、 For the purpose of references on drawings and orders, the cables shall be designated by a part number composed as follows: Part number GXXX XX X XXXX Specification number Type number Class number Size number Marking Cables shall be marked with their part number together with the following additiona
48、l information which shall be clearly separated from the part number. Details of origin XX XX XX Country of origin Manufacturer Year of manufacture This information shall be permanently and legibly printed. It shall appear on the cable in a contrasting colour and shall be repeated at a spacing of 150
49、 mm to 300 mm. The axis of the characters shall be either horizontal or perpendicular to the axis of the cable for sizes 10 and smaller cables, but shall be horizontal to the axis of the cable for sizes 8 and larger cables. The height of the characters on cable sizes 10 to 24 shall be approximately two thirds of the maximum cable diameter, and on cable sizes 8 to 0000 shall be as applied to the size 10 cables. All letters shall be capitals. Single-screened and jacketed cabl
