1、BRITISH STANDARD AEROSPACE SERIES BS3G233: 1990 (Superseding BS2G233:1987) Specification for Electric cables for general airframe or equipment interconnect use(135 C), extruded insulationBS3G 233:1990 This British Standard, having been prepared under the directionof the Aerospace Standards Policy Co
2、mmittee (ACE/-), was published under theauthority of the Board of BSIand comes into effect on 31December1990 BSI 02-2000 The following BSI references relate to the work on this standard: Committee referenceACE/6 Draft for comment89/71917DC ISBN 0 580 18714 4 Committees responsible for this British S
3、tandard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/6, upon which the following bodies were represented: Association of Manufacturers Allied to the Electrical and Electronic Industry(BEAMA Ltd.) British Airways
4、 British Cable Makers Confederation British Rubber Manufacturers Association Civil Aviation Authority Electronic Components Industry Federation Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date of issue CommentsBS3G 233:1990 BSI 02-2000 i Co
5、ntents Page Committees responsible Inside front cover Foreword iii 1 Scope 1 2 Classification 1 3 Construction 1 4 Designation and marking 6 5 Packaging and labelling 9 6 Tests 9 7 Reference samples 15 Figure 1 Variation of resistance of copper with temperature 20 Table 1 Type 01, class 1: single-co
6、re unscreened interconnect cables (135 C) 2 Table 2 Type 01/EL, class 1: single-core unscreened interconnect cables (135 C) 3 Table 3 Type 02, class 1: single-core unscreened airframe cables (135 C) 3 Table 4 Type 02/EL, class 1: single-core unscreened airframe cables (135 C) 4 Table 5 Type 01, clas
7、ses2,3 and4: multi-core unscreened, twisted interconnect cables without jacket (135 C) 4 Table 6 Type 01/EL, classes2,3 and4: multi-core unscreened, twisted interconnect cables without jacket (135 C) 4 Table 7 Type 02, classes2,3 and4: multi-core unscreened, twisted airframe cables without jacket (1
8、35 C) 5 Table 8 Type 02/EL, classes2,3 and4: multi-core unscreened, twisted airframe cables without jacket (135 C) 5 Table 9 Type 03, classes2,3 and4: multi-core unscreened, twisted interconnect cables with jacket (135 C) 5 Table 10 Type 04, classes2,3 and4: multi-core unscreened, twisted airframe c
9、ables with jacket (135 C) 6 Table 11 Type 05, classes1,2,3 and4: single-core screened with jacket and multi-core twisted and screened with jacket, interconnect cables (135 C) 7 Table 12 Type 05/EL, classes1,2,3 and4: single-core screened with jacket and multi-core twisted and screened with jacket, i
10、nterconnect/airframe cables (135 C) 7 Table 13 Type 06, classes1,2,3 and4: single-core screened with jacket and multi-core twisted and screened with jacket, interconnect airframe cables (135 C) 8 Table 14 Type 06/EL, classes1,2,3 and4: single-core screened with jacket and multi-core twisted and scre
11、ened with jacket, airframe cables (135 C) 8 Table 15 Conductor overall diameter for extra-light-weight cables 9 Table 16 Colour of insulation of class1 extra-lightweight cables 9 Table 17 Colour of insulation of classes2,3 and4 extra-lightweight cables 9 Table 18 Cable tests and requirements: types0
12、1, 01/EL,02,02/EL 10 Table 19 Cable tests and requirements: types05,05/EL,06,06/EL 13 Table 20 Cable tests and requirements: types03 and04 14BS3G 233:1990 ii BSI 02-2000 Page Table 21 Test applications 15 Table 22 Specific test parameters 17 Table 23 Current ratings for general purpose135 C airframe
13、 cable 19 Publications referred to Inside back coverBS3G 233:1990 BSI 02-2000 iii Foreword This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, specifies requirements for a range of lightweight and extra-lightweight thin wall insulated cables t
14、hat are individually suitable for general airframe or equipment interconnect use. It is a revision ofBS2G233:1987 which is withdrawn. The dielectric insulation material is applied by extrusion or extrusions over the conductor. The standard requires the application of the dielectric material so as to
15、 provide the minimum penalties of weight and space whilst offering reliable performance over a full airframe life of not less than50000 h. Cables manufactured to this standard are not required to meet the fire resistance requirements ofBS3G100-3.13, but they are required to satisfy the flammability
16、requirements ofBSG230. 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 confer immunity from legal obligations. Summary of pages T
17、his document comprises a front cover, an inside front cover, pagesi toiv, pages1to20, an inside 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.iv blankB
18、S3G 233:1990 BSI 02-2000 1 1 Scope This British Standard specifies construction and performance requirements for a range of lightweight and extra-lightweight cables (designated/EL) with extruded insulation suitable for general airframe use in all sizes. The cables are also suitable for equipment int
19、erconnect use in the size ranges26 to18 (standard lightweight cable) and24 to14 (extra-lightlightweight cable). The following types of cables are specified: The cables are suitable for continuous use. where the maximum stabilized conductor temperature does not exceed135 C, and for applications invol
20、ving flexing at temperatures down to65 C. The cables are suitable for use where the potential between conductors or between a conductor and screen, or the aircraft structure does not exceed600Vr.m.s and the frequency does not exceed2000Hz. Interconnect cables are suitable for use in areas with some
21、physical protection, such as behind panels or bulkheads, and may also be used as the basis for cables having additional protection such as a jacket or screen and jacket. They also have an application for the internal wiring of equipment. Airframe cables are of sufficiently robust construction to be
22、used for open aircraft wiring. The continuous and short-term current ratings for the cables are specified in this standard. NOTE 1The titles of the publications referred to in this standard are listed on the inside back cover. NOTE 2The latest revision of an Aerospace Series standard is indicated by
23、 a prefix number. 2 Classification Cables shall be classified according to the number of cores as follows: class 1: single core; class 2: two core; class 3: three core; class 4: four core. 3 Construction 3.1 General The materials and methods of construction used for the formation of the cables shall
24、 be defined and controlled 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. 3.2 Conductors
25、 3.2.1 Conductors shall comply withBS2G231 before being fabricated into completed cable. 3.2.2 Copper strands shall be tin plated and high strength copper alloy strands shall be silver plated. NOTEConductors for extra-lightweight cables have reduced dimension tolerances to achieve the necessary weig
26、ht reduction. 3.3 Insulation 3.3.1 The insulation for interconnect cables shall consist of one or more homogeneous extruded layers of dielectric material and, for airframe cables, two or more extruded layers. An overall coating may also be provided which, for the purposes of this standard, shall be
27、regarded as part of the cable. type 01 and 01/EL interconnect type 02 and 02/EL airframe single-core or twisted multi-cores only; type 03 interconnect type 04 airframe two or more cores with an outer jacket; type 05 and 05/EL interconnect type 06 and 06/EL airframe single or multi-core, with a scree
28、n and outer jacket. 1) The Approving Authority is either: a) for UK civil aviation products, 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 Defenc
29、e Quality Assurance, Directorate of Standardization, Kentigern House,65BrownStreet, GlasgowG28EX.BS3G 233:1990 2 BSI 02-2000 3.3.2 The material shall be new, and shall have been subjected only to those processes essential foritsmanufacture and application. 3.3.3 Where two layers are used they shall
30、be of contrasting colours. 3.4 Screen 3.4.1 The screen shall consist of a braid having a minimum coverage of85% and a lay factor of less than3when calculated in accordance with AppendixA ofBSG230. There shall be no joints in the complete screen. 3.4.2 Where breaks in individual strands occur, the en
31、ds shall be brazed or tucked into the weave ensuring that the cut end is on the outside of the screen. There shall not be more than one such break in any300mm length of cable, or in any10m length of individual strand. 3.4.3 Strands from which the braid is constructed shall be tin plated and shall co
32、mply withBS2G231 before braiding. 3.5 Jacket The jacket shall consist of insulating material. 3.6 Mass and dimensions The mass and dimensions of cables shall be as given inTable 1 toTable 15 as appropriate. NOTEThe mass per unit length figures shown inTable 2,Table 4,Table 6,Table 8,Table 12 andTabl
33、e 14 are achievable by usingcloser tolerance conductors. These closer tolerances are shown inTable 15. 3.7 Multi-core cables 3.7.1 Multi-core cables shall consist of two or more single-cores complying with3.6, twisted together with a lay of approximately12times the diameter over the laid-up core for
34、 sizes26 to4, and approximately16times the diameter over the laid-up core for sizes2 to0000. 3.7.2 Types 01,01/EL,02,and02/EL shall consist of twisted assemblies of single-core cable. 3.7.3 Types03 and04 shall consist of twisted assemblies with an outer jacket. Types05,05/EL,06 and06/EL shall consis
35、t of twisted assemblies with a screen and outer jacket. Table 1 Type 01, class 1: single-core unscreened interconnect cables(135 C) Size Radial thickness of insulation (min.) Overall diameter Maximum conductor resistance at20 C Mass per unit length (max.) Min. Max. mm mm mm 7/km kg/km 26 0.13 0.76 0
36、.86 153 a 2.12 24 0.13 0.89 0.99 106 a 2.87 22 0.13 1.04 1.14 61.3 4.22 20 0.13 1.22 1.37 33.6 6.86 18 0.13 1.47 1.63 21.2 10.30 NOTEThe nominal mass of the cable is typically95% of the maximum mass. The manufacturer should declare the nominal mass in the declaration of design performance (DDP). a S
37、ilver-plated copper alloy.BS3G 233:1990 BSI 02-2000 3 Table 2 Type 01/EL, class1: single-core unscreened interconnect cables(135 C) Table 3 Type 02, class 1: single-core unscreened airframe cables(135 C) Size Radial thickness of insulation (min.) Overall diameter Maximum conductor resistance at20 C
38、Mass per unit length (max.) Min. Max. mm mm mm 7/km kg/km 24 0.13 0.89 0.99 106 a 2.44 22 0.13 1.04 1.14 61.3 3.52 20 0.13 1.22 1.37 33.6 6.40 18 0.13 1.47 1.63 21.2 9.69 16 0.13 1.68 1.83 14.6 13.67 14 0.13 2.08 2.29 10.7 17.61 NOTEThe nominal mass of the cable is typically95% of the maximum mass.
39、The manufacturer should declare the nominal mass in the declaration of design performance (DDP). a Silver-plated copper alloy. Size Radial thickness of insulation (min.) Overall diameter Maximum conductor resistance at20 C Mass per unit length (max.) Min. Max. mm mm mm 7/km kg/km 26 0.2 0.96 1.07 15
40、3 a 2.66 24 0.2 1.09 1.19 106 a 3.45 22 0.2 1.22 1.37 61.3 4.99 20 0.2 1.42 1.58 33.6 7.69 18 0.2 1.70 1.85 21.2 11.32 16 0.2 1.92 2.13 14.6 15.72 14 0.25 2.23 2.44 10.7 21.06 12 0.25 2.74 2.95 6.44 32.30 10 0.25 3.30 3.61 4.08 52.30 8 0.25 4.76 5.15 2.28 94.50 6 0.25 5.81 6.32 1.49 143 4 0.25 7.85
41、8.11 0.924 238 2 0.25 9.93 10.54 0.585 378 1 0.25 11.36 11.97 0.485 470 0 0.25 12.54 13.35 0.369 601 00 0.25 14.39 15.20 0.283 782 000 0.25 15.82 16.73 0.229 951 0000 0.25 18.23 18.71 0.179 1230 NOTEThe nominal mass of the cable is typically95% of the maximum mass. The manufacturer should declare th
42、e nominal mass in the DDP. a Silver-plated copper alloy.BS3G 233:1990 4 BSI 02-2000 Table 4 Type 02/EL, class 1: single-core unscreened airframe cables(135 C) Table 5 Type 01, classes2,3 and4: multi-core unscreened, twisted interconnect cableswithout jacket(135 C) Table 6 Type 01/EL, classes2,3 and4
43、: multi-core unscreened, twisted interconnect cableswithout jacket(135 C) Size Radial thickness of insulation (min.) Overall diameter Maximum conductor resistance at20 C Mass per unit length (max.) Min. Max. mm mm mm 7/km kg/km 24 0.2 1.09 1.19 106 a 3.06 22 0.2 1.22 1.37 61.3 4.29 20 0.2 1.42 1.58
44、33.6 6.90 18 0.2 1.70 1.85 21.2 10.80 16 0.2 1.92 2.13 14.6 15.00 14 0.25 2.23 2.44 10.7 19.98 NOTEThe nominal mass of the cable is typically95% of the maximum mass. The manufacturer should declare the nominal mass in the DDP. a Silver-plated copper alloy. Size Class 2: two-core twisted Class 3: thr
45、ee-core twisted Class 4: four-core twisted Maximum conductor resistance per core at20 C Overall diameter a Mass per unit length (max.) Overall diameter a Mass per unit length (max.) Overall diameter a Mass per unit length (max.) Min. Max. Min. Max. Min. Max. mm mm kg/km mm mm kg/km mm mm kg/km 7/km
46、26 1.63 1.72 4.37 1.75 1.85 6.55 1.96 2.08 8.73 159 b 24 1.78 1.98 5.91 2.03 2.13 8.85 2.28 2.39 11.82 110 b 22 2.18 2.29 8.69 2.36 2.46 13.04 2.64 2.75 17.39 63.7 20 2.59 2.74 14.13 2.79 2.97 21.20 3.12 3.30 28.26 34.9 18 3.10 3.26 21.22 3.35 3.51 31.83 3.76 3.93 42.44 22.1 NOTEThe nominal mass of
47、the cable is typically95% of the maximum mass. The manufacturer should declare the nominal mass in the DDP. a Diameter of circumscribing circle. b Silver-plated copper alloy. Size Class 2: two-core twisted Class 3: three-core twisted Class 4: four-core twisted Maximum conductor resistance per core a
48、t20 C Overall diameter a Mass per unit length (max.) Overall diameter a Mass per unit length (max.) Overall diameter a Mass per unit length (max.) Min. Max. Min. Max. Min. Max. mm mm kg/km mm mm kg/km mm mm kg/km 7/km 24 1.78 1.98 5.02 1.92 2.13 7.51 3.40 2.39 10.05 110 b 22 2.08 2.28 7.25 2.26 2.46
49、 10.87 2.51 2.75 14.50 63.7 20 2.44 2.74 13.18 2.64 2.96 19.78 2.94 3.30 36.37 34.9 18 2.94 3.26 19.96 3.18 3.51 29.94 3.54 3.93 39.92 22.1 16 3.36 3.66 28.20 3.63 3.96 42.20 4.05 4.41 56.32 15.2 14 4.16 4.48 36.30 4.49 4.95 54.42 5.01 5.52 72.55 10.7 NOTEThe nominal mass of the cable is typically95% of the maximum mass. The manufacturer should declare the nominal mass in the DDP. a Diameter of circumscribing circle. b Silver-plated copper alloy.BS3G 233:1990 BSI 02-2000 5 Table 7 T
