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1、BRITISH STANDARD AEROSPACE SERIES BS G 212:1971 Incorporating Amendment Nos. 1, 2, 3, 4, 5, 6, 7 and 8 Specification for General requirements for aircraft electrical cables UDC 629.7.066:621.315.2 BS G 212:1971 This British Standard, having been approved by the Aerospace Industry Standards Committee
2、, was published under the authority of the Executive Board of the Institution on 26 March 1971 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 69/33979 ISBN 0 580 06368 2 Amendments issued since publication Amd. No.Date of iss
3、ueComments 1017August 1972 1333March 1974 1649January 1975 2135October 1976 2300June 1977 2674July 1978 3820December 1981 5113August 1986Indicated by a sideline in the margin BS G 212:1971 BSI 03-2000i Contents Page Forewordiii 1General 1.1Scope1 1.2Definitions1 1.3Materials1 1.3.1Copper and copper
4、alloy conductors, wires and strips1 1.3.2Aluminium and aluminium alloy conductors and wires1 1.3.3Insulation1 1.3.4Glass braid1 1.3.5Outer covering1 1.4Construction1 1.4.1Conductors1 1.4.2Complete cable1 1.5Phase identification1 1.6Colour fastness2 1.7Metal and glass braids2 1.8Cable identification2
5、 1.8.1Cable name2 1.8.2Cable size2 1.8.3Country of origin2 1.8.4Manufacturers code letters2 1.8.5Year of manufacture2 1.9Designation of the cable2 1.10Packaging and labelling2 2Tests 2.1General3 2.2Check voltage4 2.3Voltage at high temperature4 2.4Resistance to fluids4 2.5Resistance to hot kerosine5
6、 2.6Ageing in air (Method 1)5 2.7Ageing in air (Method 2)5 2.8Surface creepage (Method 1)6 2.9Surface creepage (Method 2)6 2.10Low temperature6 2.11Heat (Method 1)6 2.12Heat (Method 2)6 2.13Flexibility6 2.14Climatic7 2.15Installation and service durability tests7 2.16Melting point of nylon sheath8 2
7、.17Properties of PVC insulation9 2.18Pliability tests10 2.19Simulated installation10 2.20Construction10 2.21Voltage test10 2.22Insulation resistance test11 2.23Spark test on core11 BS G 212:1971 ii BSI 03-2000 Page 2.24Spark and voltage test on completed cable11 2.25Conductor resistance11 2.26Identi
8、fication, packaging and labelling11 2.27Flammability test (Method 1)11 2.28Flammability test (Method 2)11 2.28AFlammability test (Method 3)12 2.29Fire resistance test12 2.30Heat cycling13 2.31Shrinkage13 2.32Mechanical strength of wires from copper or copper alloy conductors13 2.33Mechanical strengt
9、h of wires from aluminium or aluminium alloy conductors13 2.34Visual inspection of wires13 2.35Tinning of metal braids13 2.36Nickel plating of wires13 2.37Silver plating of wires13 Appendix A Formulae for calculating braiding details15 A.1Formulae for glass braid15 A.2Formulae for metal braid15 Appe
10、ndix B Manufacturers identification marks15 Appendix C Dimensions of ferrule for hot kerosine test16 Appendix D Rigs for installation and service durability tests17 D.1Text deleted17 D.2Scrape abrasion test rig17 D.3Dynamic cut-through test rig17 D.4Notch propagation test rig18 Appendix E Rigs for p
11、liability tests19 E.1Method 119 E.2Method 119 Appendix F Current rating tests21 F.1General21 F.2Long-term ratings21 F.3Short-term ratings21 F.4Apparatus, measurement and recording21 F.5Procedure for long-term rating tests22 F.6Procedure for short-term rating tests22 Figure 1 Detail of ferrule16 Figu
12、re 2 Figure deleted17 Figure 3 Figure deleted17 Figure 4 Figure deleted17 Figure 5 Scrape abrasion test rig17 Figure 6 Dynamic cut-through test rig and electrical circuit18 Figure 7 Notch propagation test rig19 Figure 8 Pliability test rig: Method 120 Figure 9 Pliability test rig: Method 220 Figure
13、10 Test oven and associated equipment23 Figure 11 Test apparatus for electric cable flammability test24 Table 1 Letters for the identification of the year of manufacture14 Table 2 Test fluids14 BS G 212:1971 BSI 03-2000iii Foreword This British Standard has been produced to specify those requirement
14、s 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 aircraft metric cables: BS G, Tersil type electrical cables1). BS G, Efglas type electrical cables1). BS G, Nyvin type electrical cables1). BS G
15、, Minyvin type electrical cables1). BS G, Fepsil type electrical cables1). The specification may also be invoked in specifications, drawings or contracts for other types of aerospace electrical cables. This standard makes reference to the following British Standards: BS 3G 100, General requirements
16、for equipment in aircraft Part 2: All equipment Section 3: Environmental conditions1). BS 1154, Vulcanized natural rubber (high quality). BS 2627, Wrought aluminium for electrical purposes. Wire. BS 2782, Methods of testing plastics. BS 6004, PVC-insulated cables (non-armoured) for electric power an
17、d lighting. BS 6360, Copper conductors in insulated cables and cords. BS 6746, PVC insulation and sheath of electric cables. BS 6746C, Colour chart for PVC insulation and sheath of electric cables. NOTEInformation concerning SI units is given in BS 350, “Conversion factors and tables”, and PD 5686,
18、“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 for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages T
19、his document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 24 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparati
20、on. iv blank BS G 212:1971 BSI 03-20001 1 General 1.1 Scope This British Standard specifies a number of requirements applicable to aircraft general purpose cables from which requirements for specific cables may be selected for inclusion in the relevant individual cable detailed specification. 1.2 De
21、finitions (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 applicable, be in accordance with the requirements of BS 6360. The conductors only shall comply with the tensile test requirements stat
22、ed in 2.32. Copper alloy conductors and wires shall, before stranding, satisfy the requirements of the individual cable specification. Nickel coated conductors or wires shall be coated to the thickness stated in the individual cable specification, and shall also comply with the requirements of 2.34
23、and 2.36. Silver plated conductors or wires shall be coated to the thickness stated in the individual cable specification, and shall also comply with the requirements of 2.34 and 2.37. Copper strip shall comply with the requirements of the individual cable specification. Tinned conductors or wires s
24、hall comply with the tinning tests specified in BS 6360. 1.3.2 Aluminium and aluminium alloy conductors and wires. Aluminium conductor wires shall, before stranding, comply with the requirements of BS 2627. Wires taken from the stranded or bunched conductor shall comply with 2.34. Aluminium alloy co
25、nductors 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 individual cable specification. NOTECertain types of crimped terminations may not be suitable for use on conductors made from m
26、aterial in the 3/4 or 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 finished cable complies with all the requirements of this British Standard and the individual cable specification. 1.3.4 Glas
27、s braid. The free alkali content of glass braid shall not exceed 1 %. The glass shall be of such quality that the finished cable complies with all the requirements of this British Standard and the individual cable specification. 1.3.5 Outer covering. Outer covering materials such as sheath and tape
28、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 cause staining or discoloration of the cable. 1.4 Construction 1.4.1 Conductors. The conductor shall comprise the number and
29、 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 be as specified in the individual cable specification. There shall be no kinks or other irregularities in the complete condu
30、ctor. 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 each 50 m of wire. The complete conductor shall not be joined, and joints in single wires shall not be within 300 mm of any other joint in the same layer. 1.4.1.2 In alumin
31、ium 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 of the individual cable specification. 1.4.2.2 Insulation and other coverings shall be applied to give a circular cross
32、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 printed satisfactorily with the cable identification in accordance with 1.8, and with the appropriate circuit identific
33、ation. 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 red, yellow or blue. The colours shall match reasonably those shown in BS 6746C. The width of the stripe shall be as fol
34、lows: The length of lay for all sizes shall be 10 mm minimum and 38 mm maximum. Sizes 24 to 123 1.5 mm Sizes 10 to 00005 1.5 mm BS G 212:1971 2 BSI 03-2000 1.6 Colour fastness All colours used in the manufacture of the finished cable shall be fast to light and moisture, and shall match reasonably th
35、ose shown in BS 6746C. 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 braiding details shall be as shown in Appendix A. 1.8 Cable identification2) The cable shall be identified by i
36、ts 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 GBX is intended to take effect not later than 1 January 1978. In the meantime the code letter “G” is still ac
37、ceptable. 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 otherwise specified, be black and repeated at a spacing of 150 mm to 500 mm. The horizontal axis of the c
38、haracters shall preferably be parallel to the axis of the cable. 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 size 10 cables. All letters shall be capitals. 1.8.1 Cable name.
39、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 size shall correspond with conductor requirements stated in the individual cable specification. 1.8.
40、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 than 1 January 1977. In the meantime the code letter “G” is still acceptable. 1.8.4 Manufacturer
41、s 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 cables stated in Appendix B. 1.8.5 Year of manufacture. This character in the nomenclature shall
42、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 sintered in the case of PTFE). 1.9 Designation of the cable For the purposes of references on dr
43、awings 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 ./Uninyvin 22 BS G ./Minyvinmetsheath 14 BS G ./Unitersil 16/blue. BS G ./Duefglas 12/red/yellow.
44、 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 of 100 m on a reel or drum. Where several shorter lengths are permitted, the number of lengths and actual length(s) shall be stated. Cable sh
45、all 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 following particulars shall be plainly and permanently printed: 1) name of manufacturer; 2
46、) name and size of cable (see 1.8.1 and 1.8.2); 3) formation of conductor, e.g. 37/0.2 mm; 4) the individual cable specification number and year of issue; 5) date of manufacture, i.e. year and month; 6) release reference number or contract number, or both; 7) actual length in metres. 2) Conforms to
47、ISO 2574. BS G 212:1971 BSI 03-20003 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 the reel or drum by adhesive or staples, or may be a tie-on label with one side b
48、lank. 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 made on all or every cable length supplied. “-met” and “-metsheath” cables may, w
49、here 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 Authority3) 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 used for the cable submitted to type teats, and shall obtain the written app