BS-G-222-1976.pdf

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1、BRITISH STANDARD AEROSPACE SERIES BS G 222:1976 Incorporating Amendment Nos. 1, 2 and 3 Specification for Efglas type electric cables (metric units) UDC 629.7.064.5:621.315.211 BS G 222:1976 This British Standard, having been prepared under the direction of the Aerospace Industry Standards Committee

2、 was published under the authority of the Executive Board on 30 July 1976 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 74/73799 DC ISBN 0 580 09404 9 Foreword This British Standard has been prepared to provide a range of ca

3、bles based on the same construction as Efglas cables specified in G 192:1965 but having dimensions and test measurements in metric units. These dimensions and measurements are not in all cases the exact equivalent of the imperial units, but cables of the same size number from 22 to 12 inclusive will

4、 be normally interchangeable. This standard is intended to be read in conjunction with G 212 “General requirements for aircraft electrical cables”, which specifies the general requirements and test methods for this range of cables. A British Standard does not purport to include all the necessary pro

5、visions 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 and ii, pages 1 to 11

6、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. Amendments issued since publication Amd. No.Date of issueComments 3012December 1979 3819December 1981 6188December

7、1990 Indicated by a sideline in the margin BS G 222:1976 BSI 12-1999i Contents Page ForewordInside front cover Section 1. General 1Scope1 2References1 3Requirements1 Section 2. Efglas cables 4Construction1 5Identification2 6Duefglas and Triefglas cables2 7Designation of the cable3 8Packaging and lab

8、elling3 9Tests3 10Efglas test schedule3 11Du-and Triefglas test schedule4 Section 3. Efglasmet cables 12Construction4 13Identification4 14Designation of the cable4 15Packaging and labelling4 16Tests4 17Efglasmet test schedule5 Section 4. Efglasmetsheath cables 18Construction5 19Identification6 20Du-

9、and Triefglasmetsheath cables6 21Designation of the cable6 22Packaging and labelling6 23Tests6 24Efglasmetsheath, Du-and Triefglasmetsheath test schedule7 Section 5. Efglaslarge cables 25Construction8 26Identification8 27Colour fastness8 28Designation of the cable8 29Packaging and labelling8 30Tests

10、8 31Efglaslarge test schedule8 Appendix A Maximum long-term current ratings for Efglas cables at an ambient temperature of 220 C11 Table 1 Details of Efglas cables2 Table 2 Details of Efglasmet cables5 Table 3(a) Details of Efglasmetsheath cables6 Table 3(b) Details of Du-and Triefglasmetsheath cabl

11、es7 Table 4 Details of Efglaslarge cables9 Table 5 Abrasion test weights and minimum length of abrasion tape10 Table 6 Thickness of nickel on copper conductors and braiding wires10 Table 7 Resistance to fluids10 ii blank BS G 222:1976 BSI 12-19991 Section 1. General 1 Scope 1.1 This British Standard

12、 states the requirements for Efglas type cables for aircraft wiring which are suitable for continuous use where the maximum stabilized conductor temperature does not exceed 260 C. The cables remain flexible at temperatures down to 70 C. 1.2 The cables do not support combustion but they do not comply

13、 with the requirements of 3G 100 in respect of fire resistance. 1.3 The cables are suitable for use where the potential between conductors or between a conductor and screen or the aircraft structure does not exceed 600 volts (r.m.s.) and the frequency does not exceed 1 600 Hz. 1.4 The maximum curren

14、t ratings for Efglas cables are shown in Appendix A. 2 References Reference is made in this standard to the following British Standards: 3G 100, General requirements for equipment for use in aircraft Part 2: All equipment. 3G 100-3, Environmental conditions. Subsection 3.12. Fluid contamination. G 2

15、12, General requirements for aircraft electrical cables. G 230, Specification for general requirements for aircraft electrical cables (second series). 3 Requirements The cables shall comply with the requirements specified in the relevant sections of this standard and with the related requirements of

16、 G 212 to which reference is made. 3A Abbreviation of cable name If necessitated by the limited length of legend that the manufacturer is able to print with existing equipment, EFGLASMETSHEATH may be abbreviated to FGMETSH, DUEFGLASMETSHEATH and TRIEFGLASMETSHEATH to 2FGMETSH and 3FGMETSH respective

17、ly, and EFGLASLARGE to FGLARGE. Section 2. Efglas cables G 212 clause 4 Construction As shown in the illustration to Table 1.1.4 4.1 Conductors. Nickel-plated copper, concentric stranded for sizes 22 to 10 inclusive and rope stranded for sizes 8 to 0 000 inclusive. 1.3.1 4.2 Insulation1.3.3 PTFE Fib

18、rous glass tapes which shall contain not less than 50 % of PTFE by weight of coated tape.1.3.3 Fibrous glass yarns which shall be coated with PTFE to the extent of not less than 15 % by weight of the coated yarn. Filling factor shall be not less than 0.7. 1.3.4 1.7a Lay factor shall be not less than

19、 1.2.1.7a 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 to become a compact mass. The outer surface of the cable may present itself either as a lapped PTFE tape which

20、 shall be finally sintered, or as an extruded PTFE layer. The colour shall be white. a Braiding details. The values of d w (effective glass width) and dr (effective radial depth) for glass yarn sizes in common use are as follows Glass yarn EC5 11 1/2 (450/1/2) EC7 22 1/3 (225/1/3) dw (in mm) 0.23 0.

21、41 dr (in mm) 0.08 0.16 The formulae for calculating the braiding details are given in Appendix A of G 212. BS G 222:1976 2 BSI 12-1999 5 Identification 6 Duefglas and Triefglas cables 6.1 These cables shall consist of two or three Efglas cables of the same size, twisted together with a right-hand l

22、ay of approximately 12; times the pitch circle diameter for sizes 22 to 4 and approximately 16 times the pitch circle diameter for sizes 2 to 0 000. Table 1 Details of Efglas cables G 212 clause The cable name shall be Efglas. (See clause 4 of British Standard G 230.)1.8 6.2 Core identification1.5 6

23、.3 Colour fastness1.6 Cable size Nominal conductor area Conductor number and nominal dia. of wires mm Conductor diameter Overall diameter of finished cable Maximum conductor resistance at 20 C 7/km Mass mm2a Circular milsb (ref. only) min. mm max. mm min. mm max. mm nom. (ref. only) g/m max. g/m 22

24、20 18 16 14 12 10 8 6 4 2 1 0 00 000 0000 0.336 0.597 0.933 1.34 1.82 2.89 4.65 8.41 12.85 20.75 32.30 39.00 51.20 66.80 82.50 105.70 663 1 180 1 840 2 650 3 580 5 690 9 170 16 600 25 390 41 010 63 720 76 900 1 01 070 1 31 830 1 62 580 2 08 720 19/0.15 19/0.2 19/0.25 19/0.3 37/0.25 37/0.32 37/0.40 1

25、7/7/0.30 26/7/0.30 42/7/0.30 29/7/0.45 35/7/0.45 46/7/0.45c 60/7/0.45 74/7/0.45 35/19/0.45 0.70 0.95 1.20 1.45 1.68 2.12 2.70 4.05 5.10 6.45 8.00 9.00 10.20 11.40 12.90 14.20 0.80 1.05 1.30 1.55 1.82 2.28 2.90 4.40 5.45 6.94 8.54 9.39 10.78 12.32 13.68 15.66 1.65 1.90 2.15 2.40 2.65 3.25 4.25 5.75 6

26、.30 8.45 10.15 11.20 12.40 13.70 15.30 16.80 2.05 2.30 2.55 2.80 3.10 3.75 4.75 6.25 7.30 9.15 10.85 11.90 13.15 14.45 16.05 17.55 61.3 33.6 21.2 14.6 10.7 6.44 4.08 2.28 1.49 0.924 0.585 0.485 0.369 0.283 0.229 0.179 8.2 11.6 15.2 19.6 25.2 36.9 64.0 102 165 264 403 475 600 765 960 1 210 8.6 12.2 1

27、6.0 20.6 27 39 66.0 106 174 278 424 500 632 805 1 010 1 270 a Calculated on the basis of the formula , where d = nominal diameter of each individual wire in millimetres, and n = number of individual wires in the conductor. b Calculated on the basis of the formula d2 n, where d = nominal diameter of

28、each individual wire in mils 1 mil = 0.001 in (0.0254 mm), and n = number of individual wires in the conductor. Given for reference in relation to inch-dimensioned crimped terminations. c 46/7/0.45 represents a rope comprising 46 elements of 7 strands each of 0.45 mm diameter. nd2 4 - BS G 222:1976

29、BSI 12-19993 Group 1. Efglas 22 to 16 Group 2. Efglas 14 and 12 Group 3. Efglas 10 to 2 Group 4. Efglas 1 to 0 000 10 Efglas test schedule Type approval tests are covered by test 10.1 to test 10.21 Production quality tests are covered by test 10.1 to test 10.12 Production routine tests are covered b

30、y test 10.1 to test 10.4 G 212 clause 7 Designation of the cable 1.9 8 Packaging and labelling Sizes 8 to 0 000 may be supplied in minimum lengths of 50 m.1.10 9 Tests 2.1 9.1 The following groups shall apply for type test sampling:2.1(1) Test no. Property or testRequirement of this specificationG 2

31、12 clause 10.1ConstructionTable 1 and clause 42.20 10.2Identification, packaging and labelling2.26 10.3Conductor resistanceTable 12.25 10.4Spark test on completed cable6 000 volts (r.m.s.) Size 22 to 4 8 000 volts (r.m.s.) Size 2 to 0 000 2.24 10.5Voltage test2 000 volts (r.m.s.)2.21 10.6Insulation

32、resistance500 volts d.c., 100 M72.22 10.7FlammabilityFive specimens, 15 s application of flame. Burning time 10 s max. burn length 76 mm 2.27 10.8AbrasionTable 52.15.1 and/or 2.15.2 10.9Conductor physical0.15 mm to 0.29 mm wire u 300 MN/m2W 9 %, 0.30 to 0.51 mm wire u 300 MN/m2W 13.5 % 2.32 10.10 Vi

33、sual inspection of wiresNo visible defects2.34 10.11 Plating tests for wiresTable 62.36 10.12 ShrinkageFive cycles from room temperature to 275 5 C, holding the top temperature for 1 h and allowing the cable to return to room temperature between cycles. Maximum at each end: 3 mm sizes 22 10, Da, siz

34、es 80 000 2.31 10.13 Check voltage1 500 volts (r.m.s.)2.2 10.14 Voltage at high temperature311 C to 316 C for 120 h 1 500 volts (r.m.s.) 30 min 2.3 10.15 Resistance to fluidsTable 7 loop dia. 6 Da (6) 5 % 2.4 Procedure (1) 2.4.1 BS G 222:1976 4 BSI 12-1999 11 Du-and Triefglas test schedule 11.1 The

35、cores of these cables shall comply with the requirements of clause 10 plus ohmic resistance in accordance with Table 3(b). Section 3. Efglasmet cables 12 Construction 13 Identification Test no. Property or testRequirement of this specificationG 212 clause 10.16 Ageing in air311 C to 316 C for 120 h.

36、 followed by test 10.13 2.6 10.17 Surface creepage50 2 C for 24 h 0.2 milliamp, 1 400 volts d.c. 2.9 10.18 Low temperature75 2 C, 6 h2.10 10.19 FlexibilityLoad 2.5 kg sizes 22 to 1 Load 4.5 kg sizes 0 to 0 000 Mandrel 3 Da, sizes 22 10 Mandrel 6 Da, sizes 80 000 2.13 10.20 ClimaticDry heat 90 2 C Co

37、ld 65 + 0 10 C Extra cold 75 + 0 10 C Insulation resistance 5 M7/1 000 m 2.14 10.21 Current ratingsAppendix A (No data at present available for short term ratings) Appendix F a D is the maximum specified overall diameter of the cable. As shown in illustration to Table 2.1.4 12.1 Core. Shall meet the

38、 requirements of Section 2.1.3.1 12.2 Metal braid. Nickel-plated copper The braids shall be close fitting but whenever a single core is cut it shall be possible to slide the metal braid back by hand a distance of 100 mm in a length of 600 mm, one end of the cable being clamped The braid shall subseq

39、uently be capable of being returned to within 25 mm of the free end of the cable. There shall be not more than one break in any 25 mm of cable nor more than one spindle renewal in any 300 mm of cable. There shall be no joints in the complete braid. G 212 clause The filling factor shall be not less t

40、han 0.61.7 The lay factor shall not exceed 3.01.7 The cable name shall be Efglasmet, but printed identification shall be as for Efglas cables.1.8a 14 Designation of the cable 1.9 15 Packaging and labelling 1.10 16 Tests 2.1 16.1 The following group shall apply for type test sampling: Group 1. Efglas

41、met 22 to 10 a See also clause 3A of this standard BS G 222:1976 BSI 12-19995 17 Efglasmet test schedule The core used in these cables shall satisfy the requirements of section 2 of this specification and the completed Efglasmet cable shall satisfy this additional test schedule. Type approval tests

42、are covered by test 17.1 to test 17.9 Production quality tests are covered by test 17.1 to test 17.6 Production routine tests are covered by test 17.1 to test 17.4 Table 2 Details of Efglasmet cables Test no. Property or testRequirement of this specificationG 212 clause 17.1ConstructionTable 2 and c

43、lause 122.20 17.2Identification, packaging and labelling2.26 17.3Conductor resistanceTable 12.25 17.4Voltage test on completed cable2 000 volts (r.m.s.)2.24 17.5Visual inspection of wiresNo visible defects2.34 17.6Plating tests for wiresTable 62.36 17.7Check voltage1 500 volts (r.m.s.)2.2 17.8Voltag

44、e at high temperature311 C to 316 C for 120 h 1 500 volts (r.m.s.) for 30 min 2.3 17.9Ageing in air311 C to 316 C for 120 h, followed by test 17.7 2.6 Cable sizeDiameter of braiding wire mm Overall diameterMassMaximum conductor resistance at 20 C 7/km min. mm max. mm nom. (ref. only) g/m max. g/m 22

45、 20 18 16 14 12 10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 2.15 2.40 2.65 2.90 3.15 3.75 4.75 2.55 2.80 3.05 3.30 3.60 4.25 5.25 17.30 21.70 26.20 37.30 42.70 60.20 90.40 18.60 23.30 28.10 40.10 45.70 64.40 96.80 61.3 33.6 21.2 14.6 10.7 6.44 4.08 Section 4. Efglasmetsheath cables G 212 clause 18 Constru

46、ction As shown in illustrations to Table 3(a) and Table 3(b).1.4 18.1 Core. Shall meet the requirements of section 2. 18.2 Metal braid. Shall meet the requirements of section 3. 18.3 Sheath. The sheath of the cable may present itself either as a lapped PTFE tape, which shall be finally sintered, or

47、as an extruded PTFE layer. The colour shall be white. 1.3.5 BS G 222:1976 6 BSI 12-1999 19 Identification 20 Du-and Triefglasmetsheath cables 20.1 Construction. The cables shall consist of Duefglas or Triefglas cables, with phase identification, but with or without size identification, to which has

48、been added a protective layer of presintered PTFE tape, an overall metal braid, complying with section 3, and an outer sheath complying with 18.3. The diameters over braid and over sheath shall be as shown in Table 3(a) and the sizes of these cables shall be restricted to those shown in this table.

49、Glass yarn fillers may be used in the make-up of these cables in order to obtain a circular shape. Group 1. Efglasmetsheath 22 to 12 Group 2. Du- and Triefglasmetsheath 22 to 16 Table 3(a) Details of Efglasmetsheath cables G 212 clause The cable name shall be Efglasmetsheath.1.8a a See also clause 3A of this standard. 20.2 Core identification1.5 20.3 Colour fastness1.6 21 Designation of the cable 1.9 22 Packaging and labelling 1.10 23 Tests 2.1 23.1 The following groups shall apply for