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1、BRITISH STANDARD AEROSPACE SERIES BS G 241:1988 Specification for Fire proof electric cables for engine fire zone and airframe use UDC 629.7.064.5:621.315.21:614.841.41:620.1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled C
2、opy, (c) BSI BS G 241:1988 This British Standard, having been prepared under the direction of the Aerospace Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1988 BSI 01-2000 The following BSI references relate to the work on this standa
3、rd: Committee reference ACE/6 Draft for comment 86/73606 DC ISBN 0 580 16692 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Committee (ACE/-) to Technical Committee ACE/6, upon which the following bodies were repre
4、sented: British Airways BEAMA Ltd. British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limited Amendments issued sin
5、ce publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 BSI 01-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Classification1
6、 3Construction1 4Designation and marking2 5Packaging and labelling2 6Tests2 7Reference samples6 Appendix A Heat endurance and bend test12 Appendix B Fire proof test13 Figure 1 Variation of resistance of copper with temperature11 Figure 2 Thermal conditioning frame13 Figure 3 Fire proof test rig14 Ta
7、ble 1 Type F and type FA Class 17 Table 2 Type FSN and type FASN Classes 1, 2 and 37 Table 3 Test application8 Table 4 Specific test parameters9 Table 5 Current ratings in amperes for fire proof 260 C airframe cable10 Table 6 Current for conditioning12 Table 7 Bend test mandrels12 Publications refer
8、red toInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 ii BSI 01-2000 Foreword This British Standard, prepared under the direction of the Aerospace Standards Committee, specifies
9、a range of fire proof cables that are suitable for engine fire zone and airframe use where resistance to failure in the fire conditions given in this standard is a prime requirement. Cables manufactured in accordance with this standard are required to comply with the fire proof requirements and ther
10、efore the fire resistance requirements of BS 3G 100-2.3.13, and to satisfy the flammability requirements of BS G 230. The standard requires the application of the dielectric material so as to provide the minimum penalties of weight and space whilst offering reliable performance over a period of not
11、less than 10 000 flying hours. Cables with steel reinforcement wires are not included in this specification. Attention is drawn to BS G 230 which specifies the general requirements for aircraft electric cables (second series). A British Standard does not purport to include all the necessary provisio
12、ns 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 14, an i
13、nside back cover 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. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT
14、+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 BSI 01-20001 1 Scope This British Standard specifies the construction and performance requirements for a range of cables suitable for use in engine fire zones and other areas requiring circuit integrity in fire conditions. The size range is 22 to
15、 16. The following types of cable are specified. Type F single core, having nickel clad copper conductors Type FA single core, having nickel clad copper alloy conductors Type FSN single core or multi-core type F with a screen and outer jacket Type FASN single core or multi-core type FA with a screen
16、 and outer jacket The cables are suitable for continuous use where the maximum stabilized conductor temperature does not exceed 260 C. They are suitable for applications involving flexing at temperatures down to 65 C. The cables are suitable for use where the potential between conductors or between
17、a conductor and screen, or the aircraft structure does not exceed 600 V r.m.s. and the frequency does not exceed 2 000 Hz. The continuous current ratings for the cables are defined in this standard. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover.
18、2 Classification Cables are classified according to the number of cores as follows. Class 1: Single core Class 2: Two core Class 3: Three core 3 Construction 3.1 General The material and method of construction used for the formation of the cables shall be defined and controlled to the satisfaction o
19、f the Approving Authority1). No change shall be made to such materials or processes unless it can be shown to the satisfaction of the Approving Authority that the performance and handling properties of the cable have not been degraded. The cable shall be made of materials such that the performance r
20、equirements of this standard are satisfied. 3.2 Conductors 3.2.1 Only 100 % new materials which have been through only those processes essential to their manufacture and application into strands shall be used. 3.2.2 Strands shall be clean, bright and free from surface irregularities. 3.2.3 Conductor
21、s shall comprise the number and diameter of strands given in Table 1. They shall be concentrically stranded. The conductor diameter shall be as given in Table 1. 3.2.4 There shall be no kinks, joints or other irregularities in the completed conductor. 3.2.5 Joints in single strands shall be brazed a
22、nd there shall be not more than one such joint in any 50 m of single strand. Joints in single strands shall not be within 300 mm of any other joint in the same layer. 3.2.6 The strands shall be made of copper or high strength copper alloy and shall be nickel clad. 3.3 Insulation The insulating mater
23、ial shall be such that the performance requirements of this standard are satisfied. Only 100 % new materials that have been through only those processes essential to their manufacture and application shall be used. 1) The Approving Authority is either: a) for UK civil aviation products, the civil Av
24、iation Authority (or their accredited representatives); or b) for UK military products, information is available from the Procurement Executive, Ministry of Defence, Directorate General of Defence Quality Assurance, Directorate of Standardization, Kentigern House, 65 Brown Street, Glasgow G2 8EX. Li
25、censed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 2 BSI 01-2000 3.4 Screen The screen shall be constructed of a nickel plated copper braid having a coverage of 85 % minimum and a lay factor of less th
26、an 3 when calculated in accordance with Appendix A of BS G 230. There shall be no joints in the complete screen. Where breaks in individual strands occur, the ends shall be brazed or tucked into the weave ensuring that the cut end is on the outside of the screen. There shall be not more than one suc
27、h break in any 300 mm length of cable or in any 10 m length of individual strand. 3.5 Jacket The jacket shall be made of an insulating material, and shall be constructed such that the performance requirements of this standard are satisfied. 3.6 Single-core cables The mass and dimensions of single-co
28、re cables shall be as given in Table 1 and Table 2 as appropriate. 3.7 Multi-core cables The mass and dimensions of multi-core cables shall be as given in Table 2. The cables shall consist of two or more single cores complying with 3.6, twisted together with a lay of between 20 and 25 times the pitc
29、h circle diameter, with a screen complying with 3.4 and outer jacket complying with 3.5. 3.8 Colour 3.8.1 Types F and FA. The colour of the insulation for single-core cables shall be white with a helical red stripe to indicate it is a fire zone cable. The stripe shall be continuous and readily ident
30、ifiable. 3.8.2 Types FSN and FASN class 1. The colour of the insulation shall be either white or white with a red stripe as specified in 3.8.1. The colour of the sheath shall be white with a helical red stripe to indicate it is a fire zone cable. The stripe shall be continuous and readily identifiab
31、le. 3.8.3 Types FSN and FASN classes 2 and 3. The colour of the insulation shall be red and blue for class 2 cables and red, blue and yellow for class 3 cables. The colour of the outer sheath shall be white with a helical red stripe to indicate it is a fire zone cable. The stripe shall be continuous
32、 and readily identifiable. 4 Designation and marking The designation and marking of the cables shall be in accordance with 4.1 and 4.2 of BS G 230. NOTEThe capability of the cable to accept circuit identification marking is not required. 5 Packaging and labelling The cables shall be packed and label
33、led in accordance with BS G 230. 6 Tests The following tests shall be carried out in accordance with BS G 230. Specific requirements of this standard are given against the appropriate test. The application of each test for qualification approval, production quality testing, inspection lot testing an
34、d production routine testing shall be as given in Table 3. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 BSI 01-20003 For qualification approval testing, sizes 22 and 18 shall be tested for each
35、 type produced. BS G 230 test no. Test applicable to cable types F and FASpecific requirements of this standard 1. 2. 3. 4. 5. 6. 7. Appearance and identification of finished cable Mass per unit length of finished cable Conductor composition Visual examination of strands Insulation thickness and con
36、centricity Core and cable outer diameters Tensile strength and elongation at break of copper or copper alloy conductors Maximum values shall be as given in Table 1 and Table 2 The number of strands per conductor and the strand diameter shall be as given in Table 1 Minimum values shall be as given in
37、 Table 1 and Table 2 Minimum and maximum values shall be as given in Table 1 and Table 2 As in BS G 230, except that the tensile strength and the elongation shall be as follows: Strand diameterTensile strengthElongation Min.Min. mm Copper: 0.15 to 0.30 Copper alloy: 0.15 to 0.3 N/mm2 220 350 (for se
38、ven strands) % 10 6 10. 11. 12. 16. 16 a). 16 b).a 16 c).a 17. 18. 19. 20. 21. 22. 23. Strand plating adherence Strand plating thickness Electrical resistance of conductor High voltage Immersion Dry spark Dry impulse Insulation resistance Surface resistance Accelerated ageing Thermal endurance Adher
39、ence of insulation on conductor Delamination and shrinkage Delamination and insulation blocking As in BS G 230, except that plating should be read as cladding As in BS G 230, except that plating should be read as cladding and the thickness shall be a minimum of 27 % of the cross-sectional area Maxim
40、um values shall be as given in Table 1 and Table 2 2 500 75 V r.m.s. 5 000 150 V r.m.s. 8 000 250 V peak Test temperature 310 5 C Time 168 h Mandrel diameter and force shall be as given in Table 4 10 000 h minimum at 260 C Minimum adherence forces shall be as given in Table 4 Cycle from room tempera
41、ture to 310 5 C holding the top temperature for 6 h and allowing the cable to return to room temperature. Maximum length of conductor exposed at each end is 1.0 mm for sizes 22 to 16 Test temperature 310 5 C. Mandrel diameter and tension shall be as given in Table 4. Time 100 h a Either test 16 (b)
42、or 16 (c) may be carried out. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:31:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 241:1988 4 BSI 01-2000 BS G 230 test no. Test applicable to cable types F and FASpecific requirements of this standard 24. 25.
43、26. 27. 28. 28 (a). 28 (b). 29. 30. 31. 32. 33. 35. 36. 37. 39. 40. 42. Room temperature bend Cold bend Dynamic cut-through Notch propagation resistance Flammability Method 1 Method 2 Resistance to fluids Scrape abrasion Overload resistance Delamination Fire proof Climatic Identification durability
44、Cable to cable abrasion Colour fastness to light Current ratings Wet arc tracking Heat endurance and bend test Mandrel diameter and tension shall be as given in Table 4 Mandrel diameter and tension shall be as given in Table 4. Test temperature 65 2 C. Time 6 h The specimens shall be pre-conditioned
45、 in accordance with Appendix A Test temperature 260 5 C, 6 000 g/min at the sample. Minimum force to cut-through shall be as given in Table 4 As in BS G 230, except that mandrel diameter shall be 6 times the maximum diameter of the cable 5 specimens, 15 s exposure to flame 5 specimens, 15 s exposure
46、 to flame The specimens shall be pre-conditioned in accordance with Appendix A Test temperature 260 5 C. Force and cycles shall be as given in Table 4 T1= 310 C T2= 410 C T1= 275 5 C T2= 260 5 C Carry out the test in accordance with Appendix B. Minimum insulation resistance during flame application
47、100 k 7. There shall be no conductor breakage Humidity. Carry out the test in accordance with clause 2 c) of BS G 229a. Category B. Prepare the specimens by winding at least six turns on a mandrel of the diameter specified for test 23 in Table 4. On removal from the chamber, unwind the cable from th
48、e mandrel. It shall show no sign to normal vision of deterioration and the identification shall remain legible. The specimen shall then be subjected to the immersion test test 16 (a) except that the specimen length may be reduced Fungus resistance. Carry out the test in accordance with clause 2 j) o
49、f BS G 229b. Category F. There shall be no sign to normal vision of fungus growth Test temperature 20 5 C. Minimum cycles 100. Applied force 2 N The specimens shall be pre-conditioned in accordance with Appendix A. Minimum cycles to failure using 1.0 kg mass only: 106cycles These shall be as given in Table 5 The results shall be recorded and declared on the declaration of design and performance (DDP) Carry out the test in accordance with Appendix A a BS G 229 refers to clause 6 of EUROCAEED-14A and RTCA DO-160A
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