1、BRITISH STANDARD AEROSPACE SERIES BS G241:1988 Specification for Fire proof electric cables for engine fire zone and airframe use UDC 629.7.064.5:621.315.21:614.841.41:620.1BSG241:1988 This BritishStandard, having been prepared under the directionof the Aerospace Standards Committee, was published u
2、nder the authorityofthe Board of BSIandcomes into effect on 30September1988 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment86/73606 DC ISBN 0 580 16692 9 Committees responsible for this BritishStandard The preparation of this B
3、ritishStandard was entrusted by the Aerospace Standards Committee (ACE/-) to Technical Committee ACE/6, upon which the following bodies were represented: British Airways BEAMA Ltd. British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority Electronic Compone
4、nts Industry Federation Ministry of Defence National Supervising Inspectorate Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date of issue CommentsBSG241:1988 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Cl
5、assification 1 3 Construction 1 4 Designation and marking 2 5 Packaging and labelling 2 6 Tests 2 7 Reference samples 6 Appendix A Heat endurance and bend test 12 Appendix B Fire proof test 13 Figure 1 Variation of resistance of copper with temperature 11 Figure 2 Thermal conditioning frame 13 Figur
6、e 3 Fire proof test rig 14 Table 1 Type F and type FA Class1 7 Table 2 Type FSN and type FASN Classes1,2 and3 7 Table 3 Test application 8 Table 4 Specific test parameters 9 Table 5 Current ratings in amperes for fire proof260 C airframe cable 10 Table 6 Current for conditioning 12 Table 7 Bend test
7、 mandrels 12 Publications referred to Inside back coverBSG241:1988 ii BSI 01-2000 Foreword This BritishStandard, prepared under the direction of the Aerospace Standards Committee, specifies a range of fire proof cables that are suitable for engine fire zone and airframe use where resistance to failu
8、re 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 therefore the fire resistance requirements of BS3G100-2.3.13, and to satisfy the flammability requirements of BS G
9、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 less than10000 flying hours. Cables with steel reinforcement wires are not included in this specification. Attent
10、ion is drawn to BS G230 which specifies the general requirements for aircraft electric cables (second series). 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 Britis
11、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incor
12、porated. This will be indicated in the amendment table on the inside front cover.BSG241:1988 BSI 01-2000 1 1 Scope This BritishStandard 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 f
13、ire conditions. The size range is22 to16. 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 cor
14、e or multi-core type FA with a screen and outer jacket The cables are suitable for continuous use where the maximum stabilized conductor temperature does not exceed260 C. They are suitable for applications involving flexing at temperatures down to65 C. The cables are suitable for use where the poten
15、tial between conductors or between a conductor and screen, or the aircraft structure does not exceed600V r.m.s. and the frequency does not exceed2000Hz. The continuous current ratings for the cables are defined in this standard. NOTEThe titles of the publications referred to in this standard are lis
16、ted on the inside back cover. 2 Classification Cables are classified according to the number of cores as follows. Class1: Single core Class2: Two core Class3: Three core 3 Construction 3.1 General The material and method of construction used for the formation of the cables shall be defined and contr
17、olled to the satisfaction of the Approving Authority 1) . 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 material
18、s such that the performance requirements of this standard are satisfied. 3.2 Conductors 3.2.1 Only100% 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 irre
19、gularities. 3.2.3 Conductors 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 singl
20、e strands shall be brazed and there shall be not more than one such joint in any50m of single strand. Joints in single strands shall not be within300mm 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 Insulati
21、on The insulating material shall be such that the performance requirements of this standard are satisfied. Only100% 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 p
22、roducts, the civil Aviation 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
23、, Glasgow G28EX.BSG241:1988 2 BSI 01-2000 3.4 Screen The screen shall be constructed of a nickel plated copper braid having a coverage of85% minimum and a lay factor of less than3 when calculated in accordance with AppendixA of BS G230. There shall be no joints in the complete screen. Where breaks i
24、n 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 such break in any300mm length of cable or in any10m length of individual strand. 3.5 Jacket The jacket shall be made of an insulat
25、ing 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-core 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 cabl
26、es shall be as given in Table 2. The cables shall consist of two or more single cores complying with3.6, twisted together with a lay of between20 and25times the pitch circle diameter, with a screen complying with3.4 and outer jacket complying with3.5. 3.8 Colour 3.8.1 Types F and FA. The colour of t
27、he 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 identifiable. 3.8.2 Types FSN and FASN class1. The colour of the insulation shall be either white or white with a red stripe as specified in3.
28、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 identifiable. 3.8.3 Types FSN and FASN classes2 and3. The colour of the insulation shall be red and blue for class2 cables and red, blue and yellow f
29、or class3 cables. The colour of the outer sheath shall be white with a helical red stripe to indicate it is a fire zone cable. Thestripe shall be continuous and readily identifiable. 4 Designation and marking The designation and marking of the cables shall be in accordance with4.1 and4.2 of BS G230.
30、 NOTEThe capability of the cable to accept circuit identification marking is not required. 5 Packaging and labelling The cables shall be packed and labelled in accordance with BS G230. 6 Tests The following tests shall be carried out in accordance with BS G230. Specific requirements of this standard
31、 are given against the appropriate test. The application of each test for qualification approval, production quality testing, inspection lot testing and production routine testing shall be as given in Table 3.BSG241:1988 BSI 01-2000 3 For qualification approval testing, sizes22 and18 shall be tested
32、 for each type produced. BSG230 test no. Test applicable to cable types F and FA Specific 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
33、 and concentricity 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
34、given in Table 1 and Table 2 Minimum and maximum values shall be as given in Table 1 and Table 2 As in BS G230, except that the tensile strength and the elongation shall be as follows: Strand diameter Tensile strength Elongation Min. Min. mm Copper: 0.15 to0.30 Copper alloy: 0.15 to0.3 N/mm 2220 350
35、 (for seven strands) % 10 6 10. 11. 12. 16. 16a). 16b). a 16c). 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 enduranc
36、e Adherence of insulation on conductor Delamination and shrinkage Delamination and insulation blocking As in BS G230, except that plating should be read as cladding As in BS G230, except that plating should be read as cladding and the thickness shall be a minimum of27% of the cross-sectional area Ma
37、ximum values shall be as given in Table 1 and Table 2 2500 75V r.m.s. 5000 150V r.m.s. 8000 250V peak Test temperature310 5 C Time168h Mandrel diameter and force shall be as given in Table 4 10000h minimum at260 C Minimum adherence forces shall be as given in Table 4 Cycle from room temperature to31
38、0 5 C holding the top temperature for6h and allowing the cable to return to room temperature. Maximum length of conductor exposed at each end is1.0mm for sizes22 to16 Test temperature310 5 C. Mandrel diameter and tension shall be as given in Table 4. Time100h a Either test16(b) or16(c) may be carrie
39、d out.BSG241:1988 4 BSI 01-2000 BSG230 test no. Test applicable to cable types F and FA Specific requirements of this standard 24. 25. 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 M
40、ethod1 Method2 Resistance to fluids Scrape abrasion Overload resistance Delamination Fire proof Climatic Identification durability 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
41、Mandrel diameter and tension shall be as given in Table 4. Test temperature 65 2 C. Time6h The specimens shall be pre-conditioned in accordance with Appendix A Test temperature260 5 C,6000g/min at the sample. Minimum force to cut-through shall be as given in Table 4 As in BS G230, except that mandre
42、l diameter shall be6times the maximum diameter of the cable 5 specimens,15s exposure to flame 5 specimens,15s exposure to flame The specimens shall be pre-conditioned in accordance with Appendix A Test temperature260 5 C. Force and cycles shall be as given in Table 4 T 1 =310 C T 2 =410 C T 1 =275 5
43、 C T 2 =260 5 C Carry out the test in accordance with Appendix B. Minimum insulation resistance during flame application100k7. There shall be no conductor breakage Humidity. Carry out the test in accordance with clause2 c) of BS G229 a . Category B. Prepare the specimens by winding at least six turn
44、s on a mandrel of the diameter specified for test23 in Table 4. On removal from the chamber, unwind the cable from the 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 test16(a) ex
45、cept that the specimen length may be reduced Fungus resistance. Carry out the test in accordance with clause2 j) of BS G229 b . Category F. There shall be no sign to normal vision of fungus growth Test temperature20 5 C. Minimum cycles100. Applied force2N The specimens shall be pre-conditioned in ac
46、cordance with Appendix A. Minimum cycles to failure using1.0kg mass only:10 6 cycles 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 G229 refers to clause6 of EUROCA
47、EED-14A and RTCA DO-160A for the humidity test. b BS G229 refers to clause13 of EUROCAEED-14A and RTCA DO-160A for the fungus resistance test.BSG241:1988 BSI 01-2000 5 BSG230 test no. Test applicable to cable types FSN classes1,2 and3 and FASN classes1,2 and3 Specific requirements of this standard 1
48、. 2. 5. 6. 12. 16. 16(b). 16(d). 19. 23. 25. 26. 28. 28(a). 28(b). 29. 30. 33. Appearance and identification of finished cable Mass per unit length of finished cable Jacket thickness and concentricity Cable outer diameter Electrical resistance of conductors High voltage Dry spark Voltage test on com
49、pleted cable Accelerated ageing Delamination and insulation blocking Cold bend Dynamic cut-through Flammability Method1 Method2 Resistance to fluids Scrape abrasion Fire proof Maximum values shall be as given in Table 2 Minimum and maximum values shall be as given in Table 2 Maximum values shall be as given in Table 2 1000V r.m.s. on jacket Core to core, plus core to screen.2.5kVr.m.s. To be carried out on class1 only. Mandrel diameter for accelerated ageing,10times maximum specified cable diameter using force as g
