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1、BRITISH STANDARD BS G 192: 1965 Incorporating Amendment Nos. 1, 2, 3, 4 and 5 Specification for Efglas type electric cables with copper conductors for aircraft UDC 629.13.066:621.315.211 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:49 GMT+00:00 2006, Un
2、controlled Copy, (c) BSI BS G 192:1965 This British Standard, having been approved by the Aircraft 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 29 December 1965 BSI 12-1
3、999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment D64/9514 ISBN 0 580 34161 5 Foreword This British Standard, which has been prepared on the basis of Ministry of Aviation specification EL.1936 (Issue 4), relates to cables for use at ope
4、rating temperatures higher than those for which Tersil cables complying with BS G 189 are suitable. At temperatures above 105 C it is essential that the material and finish of any termination should be compatible with that of the conductor of the cable. Performance requirements for crimped terminati
5、ons at all temperatures are given in BS G 178. The relevant requirements of the standard are in agreement with those adopted as a basis for ISO Recommendations for the dimensions and conductor resistance of heat-resisting electric cables for aircraft, in course of preparation by the International Or
6、ganization for Standardization. The standard makes reference to the following British Standards: 2G 100, General requirements for electrical equipment and indicating instruments for aircraft. BS 872, Abrasive papers and cloths (technical products). BS 6360, Copper conductors in insulated cables and
7、cords. BS 6746, PVC insulation and sheath of electric cables. BS 6746C, Colour chart for PVC insulation and sheath of electric cables. 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 to T
8、able 5 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 are
9、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 itself
10、confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 18 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
11、 table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments 126October 1968 245April 1969 458March 1970 1100January 1973 2787March 1979Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 0
12、2:24:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 192:1965 BSI 12-1999i Contents Page ForewordInside front cover 1Scope1 Section 1. Requirements 2Materials1 3Construction1 4Fastness of colour cables3 5Cable size identification3 6Identification of manufacturer and year of manufacture3 7Designat
13、ion of cable3 8Packing and labelling3 Section 2. Tests 9General4 10Voltage test at high temperature5 11Resistance to fluids5 12Ageing in air5 13Surface creepage test5 14Low temperature test5 15Flexibility5 16Climatic test6 17Construction6 18Voltage tests on completed cable6 19Conductor resistance te
14、st7 20Identification, packing and labelling7 21Voltage test on cable7 22Insulation resistance test on cable7 23Flammability test7 24Abrasion test7 25Mechanical strength of wires from conductors7 26Visual inspection of conductor and braiding wires7 27Test for nickel plating of wires7 28Stability of i
15、nsulation8 Appendix A Classification and identification of unipren, uninyvin, unief, uniglasef and uniefglas cables15 Appendix B Current ratings for efglas cables15 Appendix C Formulae for metal braid17 Appendix D Abrasion testing machine17 Figure 1 General arrangement of cable abrasion tester18 Fig
16、ure 2 View of cable abrasion tester showing detector roller and wire with top weights removed18 Figure 3 Details of abrasion mechanism of cable abrasion tester18 Table 1 Details of uniefglas cables9 Table 2 Details of uniefglasmet cables10 Table 3 Details of uniefglasmetsheath cables10 Table 4 Detai
17、ls of du- and triefglasmetsheath cables10 Table 5 Details of uniefglaslarge cables11 Table 6 Thickness of nickel on copper conductors and braiding wires12 Table 7 Letters for the identification of the year of manufacture12 Licensed Copy: London South Bank University, London South Bank University, Sa
18、t Dec 09 02:24:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 192:1965 ii BSI 12-1999 Page Table 8 Resistance to fluids12 Table 9 Electrical tests on core and cable12 Table 10 Voltage test on metal braided cables12 Table 11 Abrasion test weights13 Table 12 Tensile test on wires from conductors13
19、 Table 13 Summary of test requirements14 Table 14 Maximum current ratings for efglas cables at an ambient temperature of 220 C16 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 192:1965 BSI 12-19991 1 Scop
20、e a) This British Standard specifies requirements for “Efglas”1) type cables for aircraft wiring of circuits in which the potential between conductors, or between a conductor and metal braid or the aircraft structure, does not exceed 600 volts (r.m.s.) and the frequency does not exceed 1 600 c/s and
21、 where any combination of ambient temperature and conductor current for continuous service does not produce a stabilized conductor temperature in excess of 260 C. The cables remain flexible at temperatures down to 70 C. The cables do not support combustion but do not comply with the requirements of
22、BS 2G 100 in respect of fire resistance. b) The generic name “Efglas” 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) Efglas. Cable with a copper conductor and composite insulation of g
23、lass and polytetrafluoroethylene (PTFE). ii) Efglasmet. Similar to the Efglas range but with the addition of a metal braid. iii) Efglasmetsheath. Similar to the Efglasmet range but with the addition of an external sheath of PTFE and glass braid. iv) Efglaslarge. Similar to the Efglas range but with
24、a greater thickness of insulation and with a correspondingly greater resistance to abrasion. These cables have the same overall diameters as those specified for the equivalent American cables (in U.S. Specification MIL-W-7139), but are heavier than their Efglas counterparts. v) Duefglas and Triefgla
25、s. Two- or three-core cables consisting of two or three Efglas cables marked with coloured stripes for phase identification and twisted together. vi) Duefglasmetsheath and Triefglasmetsheath. Duefglas and Triefglas cable assemblies with an overall metal braid and with a PTFE sheath over the braid. d
26、) The cables are classified and identified, not by current ratings, but by a series of numbers indicative of the conductor cross-sectional area. These numbers correspond to those used for equivalent American cables. An indication of the relationship between this system of identification and that pro
27、vided by BS E 21, Electric cables for aircraft (Pren Type), is given in Appendix A for information. A guide to the current ratings of Efglas cables is given in Appendix B. Section 1. Requirements 2 Materials a) Copper conductors and wires. Annealed copper wire shall be in accordance with BS 6360 as
28、far as applicable. The wire for the conductors and metal braids shall be nickel coated and shall comply with the requirements of Clauses 26 and 27. The conductors only shall comply with the tensile and elongation requirements of Clause 25. b) Insulation. The insulation shall be of such a quality tha
29、t the finished cable complies with all the requirements of this British Standard. 3 Construction a) General. i) Conductor. The conductor shall be bunched, or multi-layer bunched. It shall consist of nickel-plated copper wires complying with the requirements of Subclause 2 a). Joints in single wires
30、shall be brazed or hard soldered but the complete conductor shall not be joined. There shall be no kinks or other irregularities in the conductor. Table 1 and Table 5 state the number and diameter of individual wires to be used for the complete conductor. The resistance of the insulated conductor, m
31、easured as specified in Clause 19, shall be not greater than the values given in Table 1 and Table 5. ii) Insulation. The insulation shall consist of a layer of PTFE adjacent to the conductor and of subsequent layers of PTFE and PTFE impregnated glass braids or tapes which are subsequently heated so
32、 that the PTFE and glass braids or tapes become a compact sintered mass. All fibrous glass yarns used in braiding shall be coated with PTFE to the extent of not less than 15 per cent by weight of the coated yarn. All fibrous glass tapes used in insulation shall contain not less than 50 per cent of P
33、TFE by weight of coated tape. 1) The various combinations of the word “Efglas” used to distinguish these cables were originated by the Royal Aircraft Establishment of the Ministry of Aviation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:49 GMT+00:00 20
34、06, Uncontrolled Copy, (c) BSI BS G 192:1965 2 BSI 12-1999 The outer surface of the cable may present itself either as a lapped PTFE tape which shall be finally sintered, or as an extruded PTFE layer. The cables shall be circular in cross section. The insulation shall not be loose on the conductor,
35、but it shall be possible to strip the complete insulation, leaving the conductor in a condition sufficiently clean to permit satisfactory connection to termination. iii) The exterior of the cable shall be coloured white. The cable size shall be identified by the method stated in Clause 5. iv) Metal
36、braids. Nickel-plated copper wires, as specified in Subclause 2 a), shall be used to form the overall metal braids of single core or multi-core cables. The braids shall be close fitting, but wherever a single core (Uniefglasmet) cable is cut it shall be possible to slide the metal braid back by hand
37、 a distance of 4 in (102 mm) in a length of 2 ft (60 cm) one end of the cable being clamped. The braid shall subsequently be capable of being returned to within 1 in (25.4 mm) of the free end of the cable. Where breaks in the individual wires occur, the ends shall be brazed or tucked out of the brai
38、d and there shall not be more than one such break in any one-inch (25.4 mm) length of cable. Where renewal of the spindles is necessary, the ends shall be tucked out of the braid, and there shall not be more than one spindle renewal in any twelve-inch (30 cm) length of cable. There shall be no joint
39、s in the complete braid. The diameter of wire used shall be as stated in Table 2, Table 3 and Table 4. 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 shall not exceed 3. The formulae to be used for the calculation
40、of the above details are given in Appendix C. v) Sheath. Where an outer sheath is called for it shall be of PTFE as defined in the third paragraph of Sub-clause 3 a) ii) and shall be coloured white. b) Uniefglas cables i) The cables shall consist of single cores complying with the requirements of Su
41、bclauses 2 a), 2 b) and 3 a), i), ii), and iii). The outside diameters of the cables shall be as shown in Table 1. ii) When 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 s
42、hall match reasonably those specified in BS 6746. Such cables shall be ordered by the addition to the cable nomenclature of the word “red”, “yellow” or “blue” as appropriate. The average width of the stripe shall be as follows: The lay for all sizes shall be 1 in (25.4 mm) minimum and 1“ in (38.1 mm
43、) maximum. c) Uniefglasmet cables. The cables shall consist of Efglas cables to which has been added a metal braid complying with the requirements of Subclause 3 a) iv). The outside diameters of the cables shall be as shown in Table 2. d) Uniefglasmetsheath cables. The cables shall consist of Efglas
44、 cables, with or without the size identification, to which have been added a metal braid complying with the requirements of Subclause 3 a) iv) and a PTFE outer sheath complying with the requirements of Subclause 3 a) v). The outside diameters of the cables shall be as shown in Table 3. e) Duefglas a
45、nd Triefglas cables. The cables shall consist of two or three Uniefglas cables of the same size, with phase identification in accordance with Subclause 3 b) ii) in the combinations stipulated by the purchaser, twisted together with a right-hand lay approximately 12“ times the pitch circle diameter f
46、or sizes 22 to 4 and approximately 16 times the pitch circle diameter for sizes 2 to 0 000. The assemblies shall be made from single-core cables for which the manufacturer holds type approval, except that only one of the cables in an assembly need bear the printed identification. Uniefglas 22 to 12
47、1/81/16 in (3.2 1.6 mm) Uniefglas 10 to 0 000 3/161/16 in (4.8 1.6 mm) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 192:1965 BSI 12-19993 f) Duefglasmetsheath and Triefglasmetsheath. The cables shall co
48、nsist of Duefglas or Triefglas cables, with phase identification, but with or without size identification, to which have been added a protective layer of PTFE tape, an overall metal braid complying with the requirements of Subclause 3 a) iv) and an outer sheath complying with Subclause 3 a) v). The
49、diameters over braid and over sheath shall be as shown in Table 4 and the sizes of these cables shall be restricted to those shown in the table. Glass yarn fillers may be used in the make-up of these cables in order to obtain a circular shape. g) Uniefglaslarge cables. The cables shall consist of single cores complying with the requirements of Clauses 2 a), 2 b) and 3 a), i), ii) and iii). The dimensions of the cables shall be as shown in Table 5. 4 Fastness of colour cables All colours shall be fast to light, heat and moisture. The mat
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