1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD AEROSPACE SERIES BS 3G 23
2、1 : 1997 ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Conductors for general-purpose aircraft electrical cables and aerospace applicationsThis British Standard, having been prepared under the direction of the Engineering Sector Board, was publis
3、hed under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 96/703766 DC ISBN 0 580 26473 4 BS 3G 231 : 1997 Amendments issued since publication Amd. No.
4、 Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre-optic technology, upon which the following bodies were represented: British Airways British Cable Makers C
5、onfederation British Rubber Manufacturers Association Civil Aviation Authority (Airworthiness Division) Federation of the Electronics Industry Ministry of Defence Society of British Aerospace CompaniesBS 3G 231 : 1997 BSI 1997 i Contents Page Foreword ii Specification 1 Scope 1 2 Informative referen
6、ces 1 3 Materials 1 4 Construction 1 5 Electrical resistance after insulation 1 6 Tests 1 7 Packaging and labelling 3 Annex A (normative) Corresponding mass per unit length of silver for a nominal 1mm radial thickness 5 Tables 1 Conductor material 1 2 Concentric stranded conductors prior to insulati
7、on 2 3 Rope stranded conductors prior to insulation 3 4 Electrical resistance of concentric stranded conductors after insulation 4 5 Tensile strength and elongation at break of conductor prior to insulation 4 6 Tensile strength and elongation at break of conductor after insulation 4 A.1 Correspondin
8、g mass per unit length of silver for a nominal 1mm radial thickness 5 List of references Inside back coverii BSI 1997 BS 3G 231 : 1997 Foreword This British Standard has been prepared by Technical Committee ACE/6. It is based on ISO 2635 : 1979, published by the International Organization for Standa
9、rdization (ISO), and constitutes a revision of BS 2G 231 : 1990, which is superseded and withdrawn. BS G 222 : 1976 was published before international agreement on ISO 2635 was achieved, and therefore differs slightly in its conductor requirements. Future aerospace cable specifications will be cross
10、-referred to BS G 231 for their conductor requirements. Compliance with a British Standard does not of itself confer immunity from legal obligations. BSI 1997 1 BS 3G 231 : 1997 Specification 1 Scope This British Standard specifies dimensions and performance requirements for multi-strand circular co
11、nductors in two distinct conditions: a) prior to application of insulation; and b) after insulation, since processing during cable manufacture may change the conductor characteristics. The conductors specified in this standard are for general-purpose aircraft electrical cables for aerospace applicat
12、ions over the nominal cross-sectional area range 0.1 mm 2 to 107 mm 2 . NOTE. This standard does not apply to conductors for fire-resistant cables, thermocouple extension cables or equipment wire. 2 Informative references This British Standard refers to other publications that provide information or
13、 guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Materials 3.1 Conductors shall be manufactured from unused materials that have been exposed only to processes essential
14、to their manufacture and application. 3.2 Conductors shall be manufactured from materials shown in table 1. 3.3 Conductors in copper and high-strength copper alloy shall be unplated (code letter A), or tinned (code letter B), or silver-plated (code letter C) or nickel-plated (code letter D) in accor
15、dance with the individual cable specification. The thickness of the silver plating (code letter C) shall be at least 1.0mm and the thickness of the nickel plating (code letter D) shall be at least 1.3mm. 3.4 The plating materials shall conform to the appropriate requirements of clause 6. Table 1. Co
16、nductor material Size Material 28 High-strength copper alloy 26 and 24 High-strength copper alloy 22 to 0000 Copper 4 Construction 4.1 Strands shall be clean, bright and free from surface irregularities. 4.2 Conductors shall comprise the number and diameter of strands given in tables 2 and 3. Conduc
17、tors shall be either concentric stranded as given in table 2 or rope stranded as given in table 3. 4.3 There shall be no kinks, joints or other irregularities in the complete conductor. 4.4 Joints in single strands shall be brazed or hard soldered. There shall be not more than one such joint in any
18、50 m of single strand. Joints in single strands shall be not within 300 mm of any other joint in the same layer. 5 Electrical resistance after insulation 5.1 The electrical resistance after insulation of concentric-stranded conductors shall conform to table 4. 5.2 The electrical resistance after ins
19、ulation of rope-stranded conductors shall conform to table 3. 6 Tests 6.1 Tensile strength and elongation 6.1.1 Method Use a tensile tester capable of 1 % accuracy, with jaw separation rates of 200 mm/min to 300 mm/min (copper) and 40 mm/min to 60 mm/min (copper alloy). For copper conductors, test s
20、ingle strands taken from the completed conductor. For copper alloy conductors, test the inner seven strands together to eliminate variance. 6.1.2 Requirement Tensile strength and elongation at break of the conductor prior to insulation shall be as given in table 5, and after insulation shall be as g
21、iven in table 6, based on an average of three tests. The initial jaw separation shall be 245 mm to 255 mm. 6.2 Mass per unit length Weigh at least 1 m of conductor. The mass per unit length for each size shall be as given in tables 2 and 3.2 BSI 1997 BS 3G 231 : 1997 1) 0.003 5 for copper alloy. 6.3
22、 Resistance 6.3.1 Method Measure the electrical resistance of the conductor (inV) and correct to 20 C using the following formula: R 20 = R T 1 + 0.003 93 1) (202 T) where T is the temperature of the conductor under test (in C); R T is the resistance of sample at temperature T; R 20 is the resistanc
23、e at 20 C. 6.3.2 Requirement The values calculated shall not exceed those given in tables 2 to 4. 6.4 Strand-plating continuity 6.4.1 Method Take three strands not less than 150 mm in length from a conductor previously straightened by hand. Degrease the strands without causing damage then wipe, usin
24、g a clean dry cloth. Ensure that any strands cleaned in this manner are not touched by hand. Immerse the strands for 30 s in a solution of sodium polysulfide of density 1.142 g/cm 3 at 20 C, then wash carefully in distilled water. In addition immerse silver- and nickel-coated strands for 15 s in a h
25、ydrochloric acid solution of density 1.088 g/cm 3 at 20 C and wash carefully in distilled water. Examine the strands under a magnification of3 30. 6.4.2 Requirement No adherent or distinct black spots shall be observed. Any blackening occurring less than 15 mm from each end shall be disregarded. 6.5
26、 Strand-plating adherence 6.5.1 Method Take three strands not less than 150 mm in length from a conductor previously straightened by hand. Wind each strand around itself, using half the specimen length as a mandrel so as to form 10 adjacent turns. Examine the strands under a magnification of3 100. 6
27、.5.2 Requirement The plating shall not exhibit any detachment or cracks. 6.6 Strand-plating thickness When measured by any approved method the thickness of silver and nickel plating shall conform to 3.3. NOTE. The corresponding mass of silver for a nominal 1.0mm radial thickness is given in annex A.
28、 Table 2. Concentric stranded conductors prior to insulation Size Code 1) Nominal cross- sectional area Circular mil area 2) Stranding Conductor diameter Maximum electrical resistance at 20 C Mass per unit length (max.) min. max. Number/nominal diameter min. max. Types A and C Types B and D mm 2 mm
29、mm mm V/km V/km g/m 28 3) 0.10 179 198 19/0.08 0.37 0.43 233 252 4) 0.87 26 3) 001 0.15 282 307 19/0.10 0.46 0.53 147 157 4) 1.45 24 3) 002 0.25 396 424 19/0.15 0.55 0.62 102 108 4) 2.00 22 004 0.4 627 699 19/0.15 0.70 0.80 56.4 58.9 3.31 20 006 0.6 1131 1226 19/0.20 0.95 1.05 31.3 32.3 5.80 18 010
30、1.0 1782 1900 19/0.25 1.20 1.30 19.9 20.4 9.00 16 012 1.2 2580 2722 19/0.30 1.45 1.55 13.7 14.0 12.9 14 020 2.0 3470 3700 37/0.25 1.68 1.82 10.2 10.5 17.5 12 030 3.0 5546 5836 37/0.32 2.12 2.28 6.18 6.31 27.6 10 050 5.0 8993 9361 37/0.40 2.70 2.90 3.93 4.00 44.3 1) For reference only (ISO 2635 code)
31、. 2) For reference only. The circular mil area (CMA) is equal to 1550.003 D 2 N where D is the diameter of the individual strands (in mm) of the conductor and N is the number of strands in the complete conductor. The conductor cross-sectional area (in mm 2 ) is the sum of the cross-sectional areas o
32、f the component strands of the conductor and is equal to 5.0673 10 4 3 CMA. 3) High-strength copper alloy. 4) Not available in tin-plated, high-strength copper alloy. Silver-plated, high-strength copper alloy (code letter C) normally used instead. BSI 1997 3 BS 3G 231 : 1997 7 Packaging and labellin
33、g 7.1 Conductors conforming to this British Standard shall be uniformly wound onto reels or bobbins, or in coils, and shall be protected against damage and the ingress of moisture. NOTE. The type of protection will vary according to the conductor plating and coil/reel geometry. 7.2 Each reel, bobbin
34、 or coil shall have a label firmly attached to it bearing the following details: Number of this standard Code letter for plating Size (see column 1 of tables 2 and 3) Name of conductor BS 3G 231 X XXXX Table 3. Rope stranded conductors prior to insulation Size Code 1) Nominal cross- sectional area C
35、ircular mil area 2) Stranding Conductor diameter (max.) Maximum electrical resistance at 20 C Mass per unit length (max.) min. max. Number/nominal diameter Types A and C Types B and D mm 2 mm mm V/km V/km g/m 8 090 9 17273 18158 127 = 127/0.30 4.40 2.1 2.3 87 6 140 14 25705 27024 273 7 = 189/0.30 5.
36、50 1.44 1.58 133 4 220 22 41937 44087 373 12 = 444/0.25 6.80 0.88 0.97 216 2 340 34 66400 69805 373 19 = 703/0.25 8.60 0.56 0.61 342 1 420 42 80379 84501 373 23 = 851/0.25 9.50 0.46 0.51 414 0 530 53 101348 106545 373 29 = 1073/0.25 10.70 0.36 0.40 522 00 680 68 129306 135937 373 37 = 1369/0.25 12.1
37、0 0.29 0.32 666 000 850 85 163215 171585 483 36 = 1728/0.25 13.60 0.23 0.25 841 0000 107 107 207418 218055 613 36 = 2196/0.25 15.20 0.18 0.20 1069 1) For reference only (ISO 2635 code). 2) For reference only. The circular mil area (CMA) is equal to 1550.003 D 2 N where D is the diameter of the indiv
38、idual strands (in mm) of the conductor and N is the number of strands in the complete conductor. The conductor cross-sectional area (in mm 2 ) is the sum of the cross-sectional areas of the component strands of the conductor and is equal to 5.0673 10 4 3 CMA.4 BSI 1997 BS 3G 231 : 1997 Table 4. Elec
39、trical resistance of concentric stranded conductors after insulation Size Code 1) Maximum electrical resistance at 20C single core cables Types A and C V/km Types B and D V/km 28 2) 242 263 3) 26 2) 001 153 164 3) 24 2) 002 106 113 3) 22 004 58.6 61.3 20 006 32.5 33.6 18 010 20.6 21.2 16 012 14.3 14
40、.6 14 020 10.4 10.7 12 030 6.30 6.44 10 050 4.01 4.08 1) For reference only (ISO 2635 code). 2) High-strength copper alloy. 3) Not available in tin-plated, high-strength copper alloy. Silver-plated, high-strength copper alloy (code letter C) normally used instead. Table 5. Tensile strength and elong
41、ation at break of conductor prior to insulation Strand diameter Tensile strength Elongation min. max. min. mm N/mm 2 N/mm 2 % Copper alloy 0.08 to 0.12 350 (for 7 strands) 6 Copper 0.08 to 0.12 0.15 to 0.40 220 220 300 300 11 12 Table 6. Tensile strength and elongation at break of conductor after in
42、sulation Strand diameter Tensile strength Elongation min. max. min. mm N/mm 2 N/mm 2 % Copper alloy 0.08 to 0.12 350 (for 7 strands) 6 Copper 0.08 to 0.12 0.15 to 0.40 220 220 300 300 9 10BS 3G 231 : 1997 BSI 1997 5 Annex Annex A (normative) Corresponding mass per unit length of silver for a nominal
43、 1mm radial thickness The mass per unit length of silver corresponding to a nominal 1mm radial thickness is given in table A.1. Table A.1 Corresponding mass per unit length of silver for a nominal 1mm radial thickness Nominal diameter of strand Mass per unit length of silver (min.) mm mg/m 0.08 2.7
44、0.10 3.3 0.12 3.9 0.15 5.0 0.20 6.6 0.25 8.3 0.30 9.9 0.32 10.5 0.40 13.26 blank BSI 1997 BS 3G 231 : 1997 List of references (see clause 2) Informative references BSI publications BRITISH STANDARDS INSTITUTION, London BS G 222 : 1976 Specification for Efglas type electric cables (metric units) ISO
45、standards publications INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO), Geneva. (All publications are available from BSI sales.) ISO 2635 : 1979 Aircraft Conductors for general purpose aircraft electrical cables and aerospace applications Dimensions and characteristicsBSI 389 Chiswick High Road
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