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1、BRITISH STANDARD BS G 195:1966 Incorporating Amendment Nos. 1 and 2 Specification for Minyvin* type electric cables for aircraft *To be pronounced “m#n#vin”. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G
2、 195:1966 This British Standard, having been approved by the Aerospace Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 27 June 1966 BSI 04-2000 The following BSI references
3、 relate to the work on this standard: Committee reference ACE/6 ISBN 0 580 34544 0 Amendments issued since publication Amd. No.Date of issueComments 2750November 1978 3456December 1980 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sa
4、t Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 BSI 04-2000i Contents Page Forewordiii 1Scope1 Section 1. Requirements 2Materials1 3Construction2 4Fastness of colours of cables2 5Identification3 6Clause deleted3 7Designation of cable3 8Packing and labelling3 Section 2. Tes
5、ts 9General3 Type tests only 10Voltage test3 11Resistance to fluids4 12Ageing in air4 13Surface creepage test5 14Low temperature test5 15Heat test5 16Flexibility5 17Climatic test6 18Melting point of nylon6 19Properties of PVC insulation7 20Abrasion test7 21Test for pliability7 22Long term voltage te
6、st8 Type and production routine tests and requirements 23Construction8 24Voltage test on core8 25Insulation resistance test on core8 26Spark test on core8 27Voltage test on completed cable9 28Conductor resistance test9 29Identification, packing and labelling9 Type and production quality tests 30Flam
7、mability test9 31Mechanical strength of wires from conductors9 32Tinning test9 33Properties of PVC insulation9 Appendix A Maximum current ratings for minyvin cables12 Appendix B Formulae for glass braid and metal braid13 Appendix C Abrasion testing machine13 Appendix D Pliability test apparatusInsid
8、e back cover Figure 2 General arrangement of cable abrasion tester14 Figure 3 View of cable abrasion tester, showing detector roller and wire with top weights removed14 Figure 4 Details of abrasion mechanism of cable abrasion tester14 Table 1 Details of minyvin cables10 Licensed Copy: London South B
9、ank University, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 ii BSI 04-2000 Page Table 2 Details of minyvinmetsheath cables10 Table 4 Resistance to fluids10 Table 5 Diameter of mandrels and test loads for bend tests10 Table 6 Diameter of
10、mandrels and test loads for flexibility test11 Table 7 Abrasion test weights11 Table 8 Pliability11 Table 9 Electrical tests on cores and cables11 Table 10 Voltage test on completed metal braided cables11 Table 11 Flammability test11 Licensed Copy: London South Bank University, London South Bank Uni
11、versity, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 BSI 04-2000iii Foreword This British Standard has been prepared to provide a range of cables for use where a degree of flexibility greater than that of standard Nyvin cable complying with BS G 1771) is required, an
12、d where a reduction of weight compared with the standard Nyvin cable is necessary. The improvement in flexibility and reduction in weight are made possible by: a) The use of a more flexible type of nylon b) The use of a finer glass braid c) Thinner PVC insulation d) The use of flat copper strip brai
13、ds on the Minyvinmetsheath versions, and an overall extruded nylon sheath. To enable them to be readily distinguished from standard Nyvin cables, the cables covered by this specification will be marked “MINYVIN 22”, etc. The standard makes reference to the following British Standards: BS 2 G 100, Ge
14、neral requirements for electrical equipment and indicating instruments for aircraft. BS G 212, General requirements for aircraft electrical cables. BS 872, Abrasive papers and cloths (technical products). BS 2004, PVC-insulated cables and flexible cords for electrical power and lighting. BS 2571, Fl
15、exible PVC compounds. BS 2746, PVC insulation and sheath of electric cables. BS 3360, Copper conductors in insulated cables and cords. NOTEThe values in British units are to be regarded as the standard. Where metric equivalents are given they are approximate and for information only. In Table 1 and
16、Table 2 such equivalents are shown only for the more essential features of the cables, i.e. the nominal conductor areas, the overall diameters of the finished cables and the weights of the cables. Equivalents of other values in these tables and more accurate conversions of the metric values which ar
17、e quoted should be based on the tables in BS 350, “Conversion factors and tables”. 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 itsel
18、f 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 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be ind
19、icated in the amendment table on the inside front cover. 1) BS G 177, “Nyvin type electrical cables for aircraft”. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank Unive
20、rsity, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 BSI 04-20001 1 Scope a) This British Standard states the requirements for “Minyvin” type cables for aircraft wiring. The cables are suitable for use in circuits in which the voltage betw
21、een conductors, between a conductor and a metal braid surrounding it, and between a conductor and the aircraft structure, nowhere exceeds 300 volts r.m.s., and in which the frequency does not exceed 1 600 c/s. The cables will withstand a transient voltage of up to 1 500 volts. The cables are suitabl
22、e for use where, in continuous service, no combination of ambient temperature and conductor current produces a stabilized conductor temperature in excess of 105 C. They are suitable for fixed wiring in aircraft at temperatures down to 75 C, but are not suitable for severe flexing at temperatures bel
23、ow 30 C. The cables do not support combustion but they do not comply with the requirements of BS 2 G 100 in respect of fire resistance. The cables are suitable for use in areas where ester-base fluids are present. A test and limit for the pliability of the cables is included in this standard (see Cl
24、ause 21). b) The generic name “Minyvin” is applicable only to cables covered by this British Standard and complying with all its requirements. c) The standard includes the following ranges of cables: i) Minyvin. Cable with a tinned copper conductor and an insulation of PVC compound and glass braid,
25、with an outer protective covering of nylon. ii) Minyvinmetsheath. Similar to the Minyvin range but with the addition of a metal strip braid and an overall nylon sheath. iii) Duminyvin and Triminyvin. Two- or three-core cables consisting of two or three Minyvin cables twisted together. d) The cables
26、are classified and identified by a series of numbers indicative of the conductor cross-sectional area. The numbers correspond to those used for equivalent American cables. e) The maximum current ratings for Minyvin cables are quoted in Appendix A. Section 1. Requirements 2 Materials a) Copper conduc
27、tors and wires. Copper conductors and wires shall be in accordance with BS 3360, as far as applicable. Wires taken from conductors shall meet the requirements for maximum tensile strength and minimum elongation at break specified in Clause 31 of this British Standard. b) PVC insulation. The PVC insu
28、lation shall be white, high temperature grade insulation of such quality that the finished cable complies with all the test requirements of this British Standard. c) Glass braid. The free alkali content of the glass shall not exceed one per cent. The glass shall be of such quality that the finished
29、cable complies with all the test requirements of this British Standard. d) Nylon sheath. The nylon shall be stabilized and free from ingredients likely to cause staining or discoloration of the cable. It shall be of such a quality that the finished cable complies with all the test requirements of th
30、is British Standard. Specimens of the nylon sheath removed from the finished cable shall comply with Clause 18. e) Tinned copper strip for braiding. The nominal characteristics of the flat tinned copper strip are as follows: Tinned copper strip Size Breaking load Elongation at break Resistance (ohms
31、/1 000 yards) in 0.018 0.002 mm 0.46 0.05 lbf 1.8 kgf 0.8 per cent 1771 0.025 0.002 0.64 0.052.51.11555 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 2 BSI 04-2000 3 Construction a) General. i)
32、Conductor. The conductor shall be bunched or stranded. It shall consist of tinned annealed copper wires complying with the requirements of Subclause 2 a). Joints in single copper wires shall be brazed or hard soldered but there shall be not more than one such joint in each 50 yards or 50 metres of w
33、ire, and the complete conductor shall not be joined. There shall be no kinks or other irregularities in the conductor. Table 1 states the number and diameter of individual wires and the formation to be used for the complete conductor. ii) Complete cable. The insulation adjacent to the conductor shal
34、l consist of a white PVC compound as specified in Subclause 2 b). The insulation shall be of uniform circular cross section throughout the length of the cable and the conductor shall be evenly centred in the insulation. The insulation shall not be loose, but it shall be possible to strip the complet
35、e insulation, leaving the conductor in a condition sufficiently clean to permit satisfactory connection to terminations. The radial thickness at any point in the wall of the PVC compound shall be not less than the values given in Table 1. A glass fibre braid shall be applied over the PVC insulation.
36、 The braid shall be closely woven and of uniform surface. The number of spindles and ends per spindle shall be such as to ensure that the filling factor is not less than 0.70. The lay factor for the different sizes of cable shall not be less than 1.20. The formulae to be used for calculating the abo
37、ve details are given in Appendix B. The cables shall have an outer protective covering of a concentric transparent nylon sheath. The cable size shall be identified by the method stated in Clause 5. b) Minyvin cables. The cables shall consist of single cores complying with the requirements of Subclau
38、ses 2 a), b), c), and 3 a). c) Minyvinmetsheath cables. The cables shall consist of Minyvin cables to which has been added a metal strip braid and a nylon sheath. Tinned copper strip, as specified in Subclause 2 e), shall be used to form the metal braid. The braid shall be close fitting, but whereve
39、r the cable is cut it shall be possible to slide the metal braid back by hand a distance of 4 in (102 mm) in a length of 2 ft (0.6 m), one end of the cable being clamped. The braid shall subsequently be capable of being returned to within 1 in (25.4 mm) of its original position. Where breaks in the
40、individual copper strips occur, the ends shall be soldered or tucked out of the braid and there shall not be more than one such break in any 12 in (305 mm) length of cable, or in any 10 yards or 10 metres of individual strip. Where renewal of the spindles is necessary, the ends shall be tucked out o
41、f the braid, and there shall not be more than one spindle renewal in any 12 in (305 mm) length of cable. There shall be no joints in the complete braid. The dimensions of the strip used shall be as stated in Table 2. The number of spindles and width of strip shall be such as to ensure that the filli
42、ng factor is not less than 0.70. The lay factor shall not exceed 3. The formulae to be used for the calculation of the above details are given in Appendix B. The cable sheathing shall be by the application of a concentric translucent white nylon sheath. The sheath shall not be loose but it shall be
43、possible to remove it without damaging the metal braid. The overall dimensions of the cable shall comply with the values given in Table 2. d) Duminyvin and Triminyvin Cables. The cables shall consist of two or three Minyvin cables of the same size with identification by means of a longitudinal strip
44、e on each cable coloured red, blue or yellow in the combination stipulated by the purchaser. The cables shall be twisted together with a right hand lay of approximately 12“ times the pitch circle diameter. 4 Fastness of colours of cables All colours shall be fast to light and moisture. The materials
45、 used shall be capable of retaining their colours after storage for long periods in the tropics. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 195:1966 BSI 04-20003 5 Identification The system of identif
46、ication shall be that specified in 1.8 of BS G 2122). The cable name shall be Minyvin, Minyvinmetsheath, Duminyvin or Triminyvin as appropriate. 6 Clause deleted 7 Designation of cable For the purpose of references on drawings and orders the cables shall be designated by the number of this British S
47、tandard, together with the individual cable name, e.g. “BS G 000/Minyvin 22” “BS G 000/Minyvinmetsheath 14” 8 Packing and labelling The length of cable, in one piece and on a separate reel or drum, shall be 100 yards (90 m) or as stated on the contract. After testing, the cable shall have the ends s
48、ealed to prevent the ingress of moisture. Each length shall bear a durable label giving the following particulars: a) Name of manufacturer. b) Name of cable, e.g. Minyvin 22. c) Size of conductor, e.g. 19/0.006 in. d) British Standard number and year of issue. e) Date of manufacture (month and year)
49、. f) Release reference number or contract number, or both. g) Actual length in yards. When the cable is being bought directly by a British Government department, the label shall also carry the Government property mark (broad arrow). Section 2. Tests 9 General Tests shall be made to prove compliance with all requirements of this British Standard. It is not intended or recommended that complete tests shall be made on every cable length supplied. Minyvinmetsheath cables shall be made from Minyvin cables complying with all the following test