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1、BRITISH STANDARD BS G 177:1961 (Replacing BS E 24) Incorporating Amendment Nos. 1, 2, 3 and 4 Specification for Nyvin type electrical cables for aircraft UDC 621.315.336:629.13.066 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS G 177:1961 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 24 March 1961 BSI 01-2000 The f
3、ollowing BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment A (ACE) 6584 ISBN 0 580 34004 X Amendments issued since publication Amd. No.Date of issueComments 4422January 1962 6006December 1966 2748November 1978 4674July 1985Indicated by a sideline in the
4、margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 177:1961 BSI 01-2000i Contents Page Forewordiii 1Scope1 Section 1. Requirements 2Materials1 3Construction2 4Fastness of colours of cables3 5Cable size
5、 identification3 6Deleted3 7Nomenclature of cable3 8Packing and labelling3 Section 2. Tests 9General4 10Voltage test4 11Resistance to fluids4 12Ageing in air5 13Surface creepage test5 14Low temperature test5 15Heat test6 16Flexibility6 17Climatic test6 18Melting point of Nylon7 19Properties of PVC i
6、nsulation7 20Abrasion test8 21Test for pliability (Sizes 22 and 20)8 22Construction8 23Voltage test on core8 24Insulation resistance test on core9 25Spark test on core9 26Voltage test on completed cable9 27Conductor resistance test9 28Identification, packing and labelling9 29Flammability test9 30Mec
7、hanical strength of wires from conductors9 31Tinning test9 32Properties of PVC insulation12 Appendix A Classification and identification of Pren and Nyvin cables16 Appendix B Maximum current ratings for Nyvin and Nyvinal cables17 Appendix C18 Appendix D Abrasion testing machine19 Appendix E Pliabili
8、ty test apparatus20 Figure 2 General arrangement of cable abrasion tester19 Figure 3 View of cable abrasion tester showing detector rolled and wire with top weights removed20 Figure 4 Details of abrasion mechanism of cable abrasion tester20 Table 1 Details of Uninyvin cables10 Table 2 Details of Uni
9、nyvinal cables11 Table 3 Details of Nyvinmet and Nyvinmetsheath cables12 Table 5 Resistance of fluids12 Table 6 Diameters of mandrels and test loads for bend tests13 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c)
10、BSI BS G 177:1961 ii BSI 01-2000 Page Table 7 Diameters of mandrels and test loads for flexibility test13 Table 8 Abrasion test weights14 Table 9 Pliability14 Table 10 Electrical tests on cores and cables14 Table 11 Voltage test on completed metal-braided cables14 Table 12 Flammability test15 Table
11、13 Tensile tests on wires from conductors15 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 177:1961 BSI 01-2000iii Foreword This British Standard represents a revision of BS E 24, prepared to bring that s
12、tandard into line with the current requirements of the aircraft industry for general purpose electrical cables, and to embody changes shown to be desirable by experience of the production of cables in accordance with the first edition of BS E 24, issued in December 1957 and amended in April 1958 (PD
13、 2989) and in May 1959 (PD 3360). It is published as BS G 177 in accordance with the policy of bringing together in one series all British Standards relating to aircraft electrical equipment. The standard provides only for cables suitable for aircraft use at stabilized conductor temperatures up to 1
14、05 C, introduced into BS E 24 by PD 3360 under the designation “Type A.” They are distinguishable from “Type B” cables with a limiting temperature of 90 C, provided for in the first edition of the standard, with black size markings, by the use of red markings on copper cables and of yellow markings
15、on aluminium cables. As a consequence of the revision, the standard no longer provides for Uninyvin1)24 cable. Uninyvin 22 cable has the same overall dimensions as Uninyvin 24, and any small saving of weight achievable by the use of the latter cable would be likely to be outweighed by the additional
16、 cost involved. Supplies of Uninyvin 24 cable for replacement purposes may be obtained by ordering to the amended 1957 edition of BS E 24. Other changes introduced are: a) provision for Uninyvin and Uninyvinal cables marked with coloured tracers for the purposes of phase identification, and for the
17、supply of two or three such cores twisted together to form Dunyvin and Trinyvin, or Dunyvinal and Trinyvinal cables; b) minor changes in the limits on the diameters of conductors of Uninyvin 10 and Uninyvin 14 cables; c) the relation of the requirements for aluminium conductors to BS 2627 instead of
18、 BS 2791, and the specification of a maximum tensile strength for aluminium wires taken from finished cable; d) a modification of the climatic test cycles e) conditioning of specimens before submission to the low temperature, flexibility and flammability tests; f) changes in the mandrels and weights
19、 for the flexibility test; g) an improved method of checking Nyvinmetsheath cables for freedom from protruding ends of wire; h) a change in the method to be used for the heat test, and its requirement as a type test only; j) the addition of details of an abrasion test as a type test. Because the sta
20、ndard defines the materials to be used in the cables, it has not been considered necessary to include a test for the emission of smoke upon heating. The relevant requirements of the standard are in agreement with those adopted as a basis for ISO Recommendations for the dimensions, conductor resistan
21、ce and performance of general purpose electrical cables with copper conductors for aircraft, in course of preparation by the International Organization for Standardization. 1) The various combinations of the word “Nyvin” used to distinguish these cables were originated by the Royal Aircraft Establis
22、hment of the Ministry of Aviation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 177:1961 iv BSI 01-2000 The standard requires reference to the following: British Standards BS G 100, General requirements
23、 for electrical equipment and indicating instruments for aircraft2). BS G 212, General requirements for aircraft electrical cables. BS 7, Rubber-insulated cables and flexible cords for electric power and lighting. BS 872, Abrasive papers and cloths (technical products). BS 2571, Flexible polyvinyl c
24、hloride (P.V.C.) extrusion compounds. BS 2627, Wrought aluminium for electrical purposes (wire). BS 2746, P.V.C. insulation and sheath of electric cables. PD 2379, Register of colours of manufacturers identification threads for electric cables and cords. Ministry of Aviation specification D.T.D 1085
25、, Climatic testing of airborne instruments and equipment. 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, Table 2 and Table 3 such equivalents are shown only for the more essential featu
26、res 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 quoted should be based on the tables in BS 350. Obsolescent (by A
27、mendment No. 4) The need for the continuance of this British Standard has been reviewed and it has been decided that it should be regarded as obsolescent. Its use for new designs is not therefore recommended. The standard will be withdrawn in due course. A British Standard does not purport to includ
28、e 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 This document comprises a front cover, an inside front cover, pages i
29、 to iv, pages 1 to 20 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. 2) In course of revision. Licensed Copy: London South Bank University, London South Bank Univ
30、ersity, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 177:1961 BSI 01-20001 1 Scope a) This British Standard states the requirements for “Nyvin” type cables for aircraft wiring. The cables are suitable for use in circuits in which the voltage between conductors, between a condu
31、ctor and a metal braid surrounding it and between a conductor and the aircraft structure nowhere exceeds 600 volts r.m.s, and in which the frequency does not exceed 1 600 c/s. The cables are suitable for use where, in continuous service, no combination of ambient temperature and conductor current pr
32、oduces 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 below 30 C. The cables do not support combustion but they do not comply with the requirements of BS G 100
33、 in respect of fire resistance. The cables are suitable for use in areas where ester-base fluids are present. b) The generic name “Nyvin” 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)
34、 Nyvin. Cable with a copper conductor and an insulation of PVC compound and glass braid with an outer protective covering of nylon. ii) Nyvinal. Similar to the Nyvin range but with a conductor of aluminium instead of copper. iii) Nyvinmet. Similar to the Nyvin range but with the addition of a metal
35、braid. iv) Nyvinmetsheath. Similar to the Nyvin range but with the addition of a metal braid and a sheath comprising a polyester film tape, a nylon fibre or ribbon braid, nylon lacquered, to prevent abrasion in installations where Nyvinmet cable is in contact with cables without a metal braid. v) Du
36、nyvin, Trinyvin, Dunyvinal and Trinyvinal. Two-or three-core cables consisting of two or three single Nyvin or Nyvinal cables twisted together. d) The cables are classified and identified by a series of numbers indicative of the conductor cross-sectional area. The numbers correspond to those used fo
37、r equivalent American cables. An indication of the relationship between this system of identification and that provided by BS E 21, “Pren type electric cables for aircraft,” is given in Appendix A for information. The maximum current ratings for Nyvin and Nyvinal cables are quoted in Appendix B. Sec
38、tion 1. Requirements 2 Materials a) Copper conductors and wires. Copper conductors and wires shall be in accordance with BS 7, as far as applicable. Wires taken from conductors, but not from braids, shall meet the requirements for maximum tensile strength and minimum elongation at break specified in
39、 Clause 30 of this British Standard. b) Aluminium conductors and wires. Aluminium wires shall be three-quarter hard and, before stranding, shall comply with the requirements of BS 2627 as far as applicable. Aluminium wires taken from the stranded or bunched conductor shall comply with the tensile an
40、d wrapping test requirements of Clause 30 of this British Standard. NOTECertain types of crimped termination may not be suitable for use with conductors made from material in the three-quarter hard condition. c) PVC insulation. The PVC insulation shall be a white, high temperature grade insulation o
41、f such quality that the finished cable complies with all the test requirements of this British Standard. d) 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 cable complies with all the test requirements of this Brit
42、ish Standard. e) Nylon braid and lacquer. The nylon braid shall be in the form of twisted fibres or ribbon. The nylon braid and lacquer shall be free from ingredients likely to cause staining or discoloration of the cable, and the braid shall be of such quality that the finished cable complies with
43、all the test requirements of this British Standard. f) Nylon sheath. The nylon shall be stabilized, colourless and transparent 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 requiremen
44、ts of this British Standard. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:24:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 177:1961 2 BSI 01-2000 Specimens of the nylon sheath removed from the finished cable shall comply with Clause 18. g) Polyester f
45、ilm tape. The tape shall be of such quality that the finished cable complies with all the test requirements of this British Standard. 3 Construction a) General. i) Conductor. The conductor shall be bunched, stranded, or rope stranded, as specified. It shall consist of tinned annealed copper wires co
46、mplying with the requirements of Clause 2 a) or of aluminium wires complying with the requirements of Clause 2 b). 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 wire, and the complete conductor shall no
47、t be joined. In aluminium conductors the ends of the wires may be tucked into the conductor. There shall be no kinks or other irregularities in the conductor. Table 1 and Table 2 state the number and diameter of individual wires and the formation to be used for the complete conductor. ii) Complete c
48、able. The insulation adjacent to the conductor shall consist of a white PVC compound as specified in Clause 2 c). 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 loos
49、e, but it shall be possible to strip the complete 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 and Table 2. A glass fibre braid, uncoloured unless otherwise specified in this British Standard, shall be applied over the PVC insulation. The braid shall be closely woven and of uniform surface. The number of spindles and ends per spindle shall be such as t