1、BRITISH STANDARD BS3988:1970 Incorporating Amendment Nos. 1, 2 and 3 Specification for Wrought aluminium for electrical purposes Solid conductors for insulated cablesBS3988:1970 This British Standard, having been approved by the Non-Ferrous Metals Industry Standards Committee, was published under th
2、e authority ofthe Executive Board on 28 January 1970 BSI 10-1999 First published February 1966 First revision January 1970 The following BSI references relate to the work on this standard: Committee reference NFM/35 Draft for comment 68/22311 ISBN 580 05575 2 Co-operating organizations The Non-ferro
3、us Metals Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Aluminium Federation* Association of Bronze and Brass Founders Association of Consult
4、ing Engineers Board of Trade British Bronze and Brass Ingot Manufacturers Association British Electrical and Allied Manufacturers Association* British Lead Manufacturers Association British Non-ferrous Metals Federation British Non-ferrous Metals Federation High Conductivity Copper Group British Non
5、-ferrous Metals Research Association Copper Development Association Crown Agents for Overseas Governments and Administrations Electric Cable Makers Confederation* Institute of British Foundrymen Institute of Metals Institution of Mechanical Engineers (Automobile Division) Institution of Mining and M
6、etallurgy Institution of Production Engineers Institution of Structural Engineers Lead Development Association Light Metal Founders Association London Metal Exchange Magnesium Industry Council Ministry of Defence, Army Department Ministry of Defence, Navy Department National Brassfoundry Association
7、 Non-ferrous Metal Stockists* Post Office* Royal Institute of British Architects Society of Motor Manufacturers and Traders Ltd. Tin Research Institute Zinc Development Association Individual manufacturer The Government department and scientific and industrial organizations marked with an asterisk i
8、n the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Railways Board Electricity Supply Industry in England and Wales Institute of Iron and Steel Wire Manufacturers Institute of Sheet Metal Engineeri
9、ng Amendments issued since publication Amd. No. Date of issue Comments 773 August 1971 3380 June 1980 5843 February 1989 Indicated by a sideline in the marginBS3988:1970 BSI 10-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 General requirements 1 1.1 Scope 1 1.2 Def
10、initions 1 1.3 Freedom from defects 1 1.4 Joints 1 1.5 Selection of test samples 1 1.6 Tensile test 1 1.7 Elongation test 1 1.8 Electrical resistance test 1 1.9 Retests 1 1.10 Certificate of compliance 1 1.11 Text deleted 1 1.12 Text deleted 1 1.13 Text deleted 1 2 Specific requirements 2 Material 1
11、350 2.1 General 2 2.2 Chemical composition limits 2 2.3 Condition 2 2.4 Dimensions 2 2.5 Mechanical properties 2 2.6 Electrical resistance 2 Appendix A Standard values (for information only) 8 Appendix B Details of the international alloy designations and chemicalcomposition limits for wrought alumi
12、nium alloys system 8 Table 1 Circular solid conductors 3 Table 2 2-core shaped solid conductors 4 Table 3A 3-core shaped solid conductors for voltages up to and including 1900/3300 V 5 Table 3B 3-core shaped solid conductors for voltages of 3800/6600 V and above 6 Table 4 4-core shaped solid conduct
13、ors 7BS3988:1970 ii BSI 10-1999 Foreword This standard makes reference to the following publications: BS 18, Method for tensile testing of metals (including aerospace materials). BS 2627, Specification for wrought aluminium for electrical purposes. Wire. BS 2897, Specification for wrought aluminium
14、for electrical purposes. Strip with drawn or rolled edges. BS 2898, Specification for wrought aluminium and aluminium alloys for electrical purposes. Bars, extruded round tube and sections. BS 5714, Method of measurement of resistivity of metallic materials. BS 6360, Specification for conductors in
15、insulated cables and cords. IEC Publication 121 Recommendation for commercial annealed aluminium electrical conductor wire “Registration record of international alloy designations and chemical composition limits for wrought aluminium and wrought aluminium alloys” (available from the Aluminium Associ
16、ation Inc., 900 19th Street, N.W., Suite 300, Washington DC20006, USA)”. This British Standard was first published in 1966 under the authority of the Non-ferrous Metals Industry Standards Committee and at the request of the Aluminium Industry in view of the increasing use of aluminium for electrical
17、 conductors of many types. Materials complying with this standard are suitable for insulated cables made to the appropriate British Standards and for which the conductors must comply with the requirements of BS 6360, “Specification for conductors in insulated cables and cords”. It is important to no
18、te that this standard lays down requirements only for the material supplied for cable manufacture, whereas BS 6360 lays down requirements for the conductors in the finished cable. This is in accordance with the method now uniformly adopted by the Institution for specifying the materials used in cabl
19、e manufacture. The resistance values and other associated physical properties take into account the relevant IEC Recommendations, namely IEC Publication No. 121:1960, “Recommendations for commercial annealed aluminium electrical conductor wire”. In this edition all dimensions are shown in metric uni
20、ts which are not exact equivalents of the original inch values. All stresses are quoted in terms of the hectobar (hbar) 1) . This standard is one of a series of standards for wrought aluminium and aluminium alloys for electrical purposes. Other standards in this series are: BS 2627, Wrought aluminiu
21、m for electrical purposes. Wire. BS 2897, Wrought aluminium for electrical purposes. Strip with drawn or rolled edges. BS 2898, Wrought aluminium and aluminium alloys for electrical purposes. Bars,extruded round tube and sections. As a major step towards alignment of aluminium and aluminium alloy co
22、mpositions on an international basis, a substantial number of countries have agreed to adopt a 4-digit classification for alloy composition designation. This system is administered by the Aluminium Association Inc., who issue the “Registration Record of International Alloy Designations and Chemical
23、Composition Limits for Wrought Aluminium Alloys.” 1) 1 hbar = 10 MN/m 2= 10 N/mm 2 .BS3988:1970 BSI 10-1999 iii By amendment, it has been decided to introduce this system into the British Standards concerned with these types of material in place of the material designations formerly used. The detail
24、s of the system are given in Appendix B. The temper designations and associated mechanical property requirements remain unaltered for the present and therefore may not necessarily align precisely with those in the standards of other countries. Material 1350 therefore replaces material C1E. Minor com
25、positional changes have been made.” 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. Summa
26、ry of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to8 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 blankBS3988:1970
27、 BSI 10-1999 1 1 General requirements 1.1 Scope This British Standard specifies requirements for circular solid and 2-, 3- and 4-core shaped solid conductors in a range of standard sizes from 16 mm 2up to and including 300 mm 2 . 1.2 Definitions For the purposes of this British Standard the followin
28、g definitions apply: diameter (for circular solid conductors) the mean of two measurements at right angles taken at the same cross section shaped solid conductor a conductor of one of the shapes shown in Table 2, Table 3A, Table 3B and Table 4, the dimensions of which are as defined 1.3 Freedom from
29、 defects The material shall be free from defects prejudicial to its use as an electrical conductor. 1.4 Joints There shall be no joints in the finished conductor. In the case of conductors drawn to size, joints made in the base rod before final drawing shall be permitted. 1.5 Selection of test sampl
30、es Test samples for the tensile, elongation and electrical resistance tests specified in 1.6, 1.7 and1.8 shall be selected as follows: Lengths of conductor of the same dimensions, produced in the same way and of the same condition, shall be grouped into batches not exceeding 1000 kg in weight and te
31、st samples shall be cut from one length selected from each batch. Before the test samples are cut off they shall be marked to identify them. The test samples shall be taken from the conductor as supplied and shall not be annealed or mechanically worked other than straightening before testing. 1.6 Te
32、nsile test The test shall be carried out in accordance with BS18 2) . The load shall be applied gradually and the rate of separation of the jaws of the testing machine shall be not less than 25 mm per minute and not greater than 100 mm per minute. 1.7 Elongation test The test shall be carried out in
33、 accordance with BS18 2) . The load shall be applied gradually and uniformly on straightened lengths of conductor, having an original gauge length of 250 mm. The elongation shall be measured on the gauge length after the fractured ends have been fitted together. The determination shall be valid, wha
34、tever the position of the fracture, if the specified value is reached. If the specified value is not reached, the determination shall be valid only if the fracture occurs between the gauge marks and not closer than 25 mm to either mark. 1.8 Electrical resistance test The resistance shall be determin
35、ed by measurement in accordance with the routine method given in BS 5714 3) . 1.9 Retests Should any one of the test pieces first selected fail to pass the mechanical or resistance tests, two further samples from the same batch shall be selected for testing, one of which shall be taken from the leng
36、th from which the original test sample was taken, unless that length has been withdrawn by the supplier. Should the test pieces from both these additional samples satisfy the requirements of the mechanical and resistance tests, the batch represented by these samples shall be deemed to comply with th
37、e standard. Should the test pieces from either of the two additional samples fail, the batch represented shall be deemed not to comply with the standard. 1.10 Certificate of compliance The supplier shall, if required, certify that the material complies with the requirements of this standard. 1.11 Te
38、xt deleted 1.12 Text deleted 1.13 Text deleted 2) BS 18, “Method for tensile testing of metals (including aerospace materials)”. 3) BS 5714, “Method of measurement of resistivity of metallic materials”.BS3988:1970 2 BSI 10-1999 Material 1350 (former BS designation C1E) 2 Specific requirements 2.1 Ge
39、neral The material shall comply with the general requirements of Section 1 and shall have the following chemical composition, condition, dimensions and mechanical and electrical properties. 2.2 Chemical composition limits 4)5) The chemical composition of material 1350 shall be as follows: 2.3 Condit
40、ion The material shall be supplied in the condition which provides the properties given in 2.5 and 2.6. 2.4 Dimensions 2.4.1 Circular solid conductors. The diameters of circular solid conductors shall be within the limits specified in Columns 7 and 8 of Table 1, and the difference between the maximu
41、m and minimum measurements taken at the same cross section shall not exceed 1 %. 2.4.2 Shaped solid conductors. The dimensions of shaped solid conductors shall be such that the profile of the conductor shall at no point lie outside the envelope defined by the dimensions specified in Columns 12, 13,
42、14 and 15 of Table 2, Table 3A, Table 3B and Table 4 and the widths and depths shall be not less than the values specified in Columns 10 and 11 of Table 2, Table 3A, Table 3B and Table 4. The angle subtended by the two flat faces of 3- and4-core shaped solid conductors shall not vary from that speci
43、fied by more than 1 . The flat faces of shaped solid conductors shall not show any degree of concavity. 2.5 Mechanical properties The mechanical properties, obtained from test pieces selected as specified in 1.5 and prepared and tested as specified in 1.6 and 1.7 shall be as follows: 2.6 Electrical
44、resistance The resistance per kilometre at 20 C determined in accordance with 1.8 shall not exceed the appropriate value given in Column 4 of Table 1, Table 2, Table 3A, Table 3B and Table 4. 4) Composition in per cent maximum unless shown as a range or a minimum. 5) For the purposes of determining
45、conformance to these limits, an observed value or a calculated value obtained from analysis is rounded off to the nearest unit in the last right-hand place of figures used in expressing the specified limit, in accordance with the following. When the figure next beyond the last figure or place to be
46、retained is less than 5, the figure in the last place retained should be kept unchanged. When the figure next beyond the last figure or place to be retained is greater than 5, the figure in the last place retained should be increased by 1. When the figure next beyond the last figure or place to be r
47、etained is 5 and a) there are no figures, or only zeros, beyond this 5, if the figure in the last place to be retained is odd, it should be increased by 1; if even, it should be kept unchanged; b) if the 5 next beyond the figure in the last place to be retained is followed by any figures other than
48、zero, the figure in the last place retained should be increased by 1, whether odd or even. Silicon 0.10 Iron 0.40 Copper 0.05 Manganese 0.01 Chromium 0.01 Zinc 0.05 Gallium 0.03 Boron 0.05 Vanadium + Titanium 0.02 Others a Each Total 0.03 0.10 Aluminium min. 99.50 b a Analysis is regularly made only
49、 for the elements for which specific limits are shown. If, however, the presence of other elements is suspected to be, or in the course of routine analysis is indicated to be, in excess of the specified limits, further analysis is made to determine that these other elements are not in excess of the amount specified. b The aluminium content for unalloyed aluminium notmade by a refining process is the difference between100.00 % and the sum of all other metallic elements present in amounts of 0.010 % or more each, expressed to the second decimal before determinin
