1、BRITISH STANDARD AEROSPACE SERIES BS G212:1971 Incorporating Amendment Nos.1, 2,3,4,5,6,7 and8 Specification for General requirements for aircraft electrical cables UDC629.7.066:621.315.2BS G 212:1971 This British Standard, having been approved by the Aerospace Industry Standards Committee, was publ
2、ished under the authorityof the Executive Boardof the Institution on 26 March1971 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment69/33979 ISBN 0 580 06368 2 Amendments issued since publication Amd. No. Date of issue Comments 10
3、17 August1972 1333 March1974 1649 January1975 2135 October1976 2300 June1977 2674 July1978 3820 December1981 5113 August1986 Indicated by a sideline in the marginBSG212:1971 BSI 03-2000 i Contents Page Foreword iii 1 General 1.1 Scope 1 1.2 Definitions 1 1.3 Materials 1 1.3.1 Copper and copper alloy
4、 conductors, wires and strips 1 1.3.2 Aluminium and aluminium alloy conductors and wires 1 1.3.3 Insulation 1 1.3.4 Glass braid 1 1.3.5 Outer covering 1 1.4 Construction 1 1.4.1 Conductors 1 1.4.2 Complete cable 1 1.5 Phase identification 1 1.6 Colour fastness 2 1.7 Metal and glass braids 2 1.8 Cabl
5、e identification 2 1.8.1 Cable name 2 1.8.2 Cable size 2 1.8.3 Country of origin 2 1.8.4 Manufacturers code letters 2 1.8.5 Year of manufacture 2 1.9 Designation of the cable 2 1.10 Packaging and labelling 2 2 Tests 2.1 General 3 2.2 Check voltage 4 2.3 Voltage at high temperature 4 2.4 Resistance t
6、o fluids 4 2.5 Resistance to hot kerosine 5 2.6 Ageing in air (Method1) 5 2.7 Ageing in air (Method2) 5 2.8 Surface creepage (Method1) 6 2.9 Surface creepage (Method2) 6 2.10 Low temperature 6 2.11 Heat (Method1) 6 2.12 Heat (Method2) 6 2.13 Flexibility 6 2.14 Climatic 7 2.15 Installation and servic
7、e durability tests 7 2.16 Melting point of nylon sheath 8 2.17 Properties of PVC insulation 9 2.18 Pliability tests 10 2.19 Simulated installation 10 2.20 Construction 10 2.21 Voltage test 10 2.22 Insulation resistance test 11 2.23 Spark test on core 11BS G 212:1971 ii BSI 03-2000 Page 2.24 Spark an
8、d voltage test on completed cable 11 2.25 Conductor resistance 11 2.26 Identification, packaging and labelling 11 2.27 Flammability test (Method1) 11 2.28 Flammability test (Method2) 11 2.28A Flammability test (Method3) 12 2.29 Fire resistance test 12 2.30 Heat cycling 13 2.31 Shrinkage 13 2.32 Mech
9、anical strength of wires from copper or copper alloy conductors 13 2.33 Mechanical strength of wires from aluminium or aluminium alloy conductors 13 2.34 Visual inspection of wires 13 2.35 Tinning of metal braids 13 2.36 Nickel plating of wires 13 2.37 Silver plating of wires 13 Appendix A Formulae
10、for calculating braiding details 15 A.1 Formulae for glass braid 15 A.2 Formulae for metal braid 15 Appendix B Manufacturers identification marks 15 Appendix C Dimensions of ferrule for hot kerosine test 16 Appendix D Rigs for installation and service durability tests 17 D.1 Text deleted 17 D.2 Scra
11、pe abrasion test rig 17 D.3 Dynamic cut-through test rig 17 D.4 Notch propagation test rig 18 Appendix E Rigs for pliability tests 19 E.1 Method1 19 E.2 Method1 19 Appendix F Current rating tests 21 F.1 General 21 F.2 Long-term ratings 21 F.3 Short-term ratings 21 F.4 Apparatus, measurement and reco
12、rding 21 F.5 Procedure for long-term rating tests 22 F.6 Procedure for short-term rating tests 22 Figure 1 Detail of ferrule 16 Figure 2 Figure deleted 17 Figure 3 Figure deleted 17 Figure 4 Figure deleted 17 Figure 5 Scrape abrasion test rig 17 Figure 6 Dynamic cut-through test rig and electrical c
13、ircuit 18 Figure 7 Notch propagation test rig 19 Figure 8 Pliability test rig: Method1 20 Figure 9 Pliability test rig: Method2 20 Figure 10 Test oven and associated equipment 23 Figure 11 Test apparatus for electric cable flammability test 24 Table 1 Letters for the identification of the year of ma
14、nufacture 14 Table 2 Test fluids 14BSG212:1971 BSI 03-2000 iii Foreword This British Standard has been produced to specify those requirements which are common to all Aerospace Series Electrical Cables in the metric range. Reference is made to this standard in the following British Standards for airc
15、raft metric cables: BS G, Tersil type electrical cables 1) . BS G, Efglas type electrical cables 1) . BS G, Nyvin type electrical cables 1) . BS G, Minyvin type electrical cables 1) . BS G, Fepsil type electrical cables 1) . The specification may also be invoked in specifications, drawings or contra
16、cts for other types of aerospace electrical cables. This standard makes reference to the following British Standards: BS 3G 100, General requirements for equipment in aircraft Part2: All equipment Section3: Environmental conditions 1) . BS1154, Vulcanized natural rubber (high quality). BS2627, Wroug
17、ht aluminium for electrical purposes. Wire. BS2782, Methods of testing plastics. BS6004, PVC-insulated cables (non-armoured) for electric power and lighting. BS6360, Copper conductors in insulated cables and cords. BS6746, PVC insulation and sheath of electric cables. BS6746C, Colour chart for PVC i
18、nsulation and sheath of electric cables. NOTEInformation concerning SI units is given in BS350, “Conversion factors and tables”, and PD5686, “The use of SI units”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible fo
19、r their correct application. 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, pagesi to iv, pages1to24 and a back cover. This standard has been updated (see copyright date) and
20、 may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation.iv blankBSG212:1971 BSI 03-2000 1 1 General 1.1 Scope This British Standard specifies a number of requirements applicable to aircraft general purpose cables fro
21、m which requirements for specific cables may be selected for inclusion in the relevant individual cable detailed specification. 1.2 Definitions (May be inserted by subsequent amendment.) 1.3 Materials 1.3.1 Copper and copper alloy conductors, wires and strips. Copper conductors and wires shall, as a
22、pplicable, be in accordance with the requirements of BS6360. The conductors only shall comply with the tensile test requirements stated in2.32. Copper alloy conductors and wires shall, before stranding, satisfy the requirements of the individual cable specification. Nickel coated conductors or wires
23、 shall be coated to the thickness stated in the individual cable specification, and shall also comply with the requirements of2.34 and2.36. Silver plated conductors or wires shall be coated to the thickness stated in the individual cable specification, and shall also comply with the requirements of2
24、.34 and2.37. Copper strip shall comply with the requirements of the individual cable specification. Tinned conductors or wires shall comply with the tinning tests specified in BS6360. 1.3.2 Aluminium and aluminium alloy conductors and wires. Aluminium conductor wires shall, before stranding, comply
25、with the requirements of BS2627. Wires taken from the stranded or bunched conductor shall comply with2.34. Aluminium alloy conductors and wires shall, before stranding, satisfy the requirements of the individual cable specification. The hardness of the conductor wires shall be as specified in the in
26、dividual cable specification. NOTECertain types of crimped terminations may not be suitable for use on conductors made from material in the 3 / 4or fully hard condition. 1.3.3 Insulation. The insulation shall be as specified in the individual cable specification and shall be of such quality that the
27、 finished cable complies with all the requirements of this British Standard and the individual cable specification. 1.3.4 Glass braid. The free alkali content of glass braid shall not exceed1%. The glass shall be of such quality that the finished cable complies with all the requirements of this Brit
28、ish Standard and the individual cable specification. 1.3.5 Outer covering. Outer covering materials such as sheath and tape shall be in accordance with all the requirements of this British Standard and of the individual cable specification. The material used shall be free from ingredients likely to
29、cause staining or discoloration of the cable. 1.4 Construction 1.4.1 Conductors. The conductor shall comprise the number and diameter of wires which shall be bunched, stranded or rope stranded as specified in the individual cable specification. The material of the wires and their coating shall also
30、be as specified in the individual cable specification. There shall be no kinks or other irregularities in the complete conductor. 1.4.1.1 Joints in single copper wires shall be brazed or hard soldered and there shall be not more than one such joint in each50m of wire. The complete conductor shall no
31、t be joined, and joints in single wires shall not be within300mm of any other joint in the same layer. 1.4.1.2 In aluminium conductors the ends of individual wires may be tucked into the conductor. 1.4.2 Complete cable 1.4.2.1 The details of construction shall be in accordance with the requirements
32、of the individual cable specification. 1.4.2.2 Insulation and other coverings shall be applied to give a circular cross section; they shall not be loose but it shall be possible to strip them to allow satisfactory termination. 1.4.2.3 The finish of the cable shall be such that it is capable of being
33、 printed satisfactorily with the cable identification in accordance with1.8, and with the appropriate circuit identification. 1.5 Phase identification Where required by the purchaser, phase identification shall be provided on the cables by means of a helical stripe of left-hand lay, in the colours r
34、ed, yellow or blue. The colours shall match reasonably those shown in BS6746C. The width of the stripe shall be as follows: The length of lay for all sizes shall be10mmminimum and38mm maximum. Sizes24 to12 3 1.5mm Sizes10 to0000 5 1.5mmBS G 212:1971 2 BSI 03-2000 1.6 Colour fastness All colours used
35、 in the manufacture of the finished cable shall be fast to light and moisture, and shall match reasonably those shown in BS6746C. The materials used shall be capable of retaining their colours after storage for long periods in the tropics. 1.7 Metal and glass braids The formulae for calculating brai
36、ding details shall be as shown in Appendix A. 1.8 Cable identification 2) The cable shall be identified by its name and size, together with code letters to indicate country of origin, manufacturer and year of manufacture in the manner shown by the following example: NOTEThe use of the code letters G
37、BX is intended to take effect not later than1 January1978. In the meantime the code letter “G” is still acceptable. This nomenclature shall be applied to the cable in the manner specified in the individual cable specification. It shall be permanent and legibly printed, on the cable and shall, unless
38、 otherwise specified, be black and repeated at a spacing of150mm to500mm. The horizontal axis of the characters shall preferably be parallel to the axis of the cable. The height of the characters on cable sizes10 to24 shall be approximately two thirds of the maximum cable diameter, and on cable size
39、s8 to0000 shall be as applied to size10 cables. All letters shall be capitals. 1.8.1 Cable name. The cable name shall be that required by the individual cable specification. Abbreviations of the name shall only be those permitted by the individual cable specification. 1.8.2 Cable size. The cable siz
40、e shall correspond with conductor requirements stated in the individual cable specification. 1.8.3 Country of origin. The code letter for the country of origin of the cable shall be “GBX” for cables manufactured in the United Kingdom. NOTEThe use of the code letters “GBX” is to take effect not later
41、 than1 January1977. In the meantime the code letter “G” is still acceptable. 1.8.4 Manufacturers code letters. The manufacturer shall not mark the cable itself with his name or address, but with code letters in accordance with the list of manufacturers identification marks for aircraft electrical ca
42、bles stated in Appendix B. 1.8.5 Year of manufacture. This character in the nomenclature shall be a letter, selected from Table 1, to indicate the year of manufacture. All manufacturers shall use the same letter for the current year, which shall be the year in which the insulation was extruded (or s
43、intered in the case ofPTFE). 1.9 Designation of the cable For the purposes of references on drawings and orders, the cables shall be designated by the individual cable specification number, together with the individual cable name, and size and, if relevant, the phase colour or colours; e.g. BS G ./U
44、ninyvin22 BS G ./Minyvinmetsheath14 BS G ./Unitersil16/blue. BS G ./Duefglas12/red/yellow. 1.10 Packaging and labelling Unless otherwise stated in the individual cable specification or contract the cable shall be supplied in a single nominal length of100m on a reel ordrum. Where several shorter leng
45、ths are permitted, the number of lengths and actual length(s) shall be stated. Cable shall not be supplied in coils unless required by the contract. After testing, the cable shall have its ends sealed to prevent the ingress of moisture. Each reel or drum shall bear a durable label upon which the fol
46、lowing particulars shall be plainly and permanently printed: 1) name of manufacturer; 2) name and size of cable (see1.8.1 and1.8.2); 3) formation of conductor, e.g.37/0.2mm; 4) the individual cable specification number and year of issue; 5) date of manufacture, i.e.year and month; 6) release referen
47、ce number or contract number, or both; 7) actual length in metres. 2) Conforms to ISO2574.BSG212:1971 BSI 03-2000 3 If the manufacturer so desires, the information may be written, provided a permanent ink is used and the characters are legible. The label may be attached permanently to the side of th
48、e reel or drum by adhesive or staples, or may be a tie-on label with one side blank. 2 Tests 2.1 General Tests shall be made to prove compliance with the relevant requirements of this British Standard and also the individual cable specification. It is not intended or recommended that all teats be ma
49、de on all or every cable length supplied. “-met” and “-metsheath” cables may, where permitted by their individual specifications, be made from the basic “uni-” cable and shall satisfy the requirements of further tests. The manufacturer shall produce evidence to the satisfaction of the Approving Authority 3)that cables of the types to be supplied to the specifications fulfil the requirements. The manufacturer shall also disclose to the purchaser and the Approving Authority any proposal to introduce constructions or processes differing from those
