1、BRITISH STANDARD BS 4087:1989 Incorporating Amendment No. 1 Specification for Copper-covered steel wire for telephone and telegraph purposes UDC 621.395.73+621.394.73:621.315.55:669.146.99 426:669.38BS4087:1989 This British Standard, having been prepared under the directionof the Iron and Steel Stan
2、dards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31 August 1989 BSI 07-1999 First published December 1966 First revision August 1989 The following BSI references relate to the work on this standard: Committee reference ISM/26 Draft for comment 88/35
3、114 DC ISBN 0 580 17096 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Iron and Steel Standards Policy Committee (ISM/-) to Technical Committee ISM/26, upon which the following bodies were represented: Aluminium Federation Bicycle Ass
4、ociation of GB British Cable Makers Confederation British Rubber Manufacturers Association British Steel Industry Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Federation of Wire Rope Manufacturers of Great Britain Forestry Commission Health a
5、nd Safety Executive Sheffield Stainless Steel Manufacturers Association Society of Chain Link Fencing Manufacturers Society of Motor Manufacturers and Traders Limited Spring Research and Manufacturers Association Stainless Steel Fabricators Association of Great Britain Stainless Steel Wire Export Gr
6、oup Welding Manufacturers Association (BEAMA Ltd.) Woven Wire Association Zinc Development Association The following bodies were also represented in the drafting of the standard, through sub-committees and panels: Fencing Industry Association Ministry of Agriculture, Fisheries and Food Wire Products
7、 Association Amendments issued since publication Amd. No. Date of issue Comments 6508 December 1990 Indicated by a sideline in the marginBS4087:1989 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Manufacture 1 4 Quality of finished wire
8、1 5 Tolerances 1 6 Inspection and testing 1 7 Selection of test pieces and number of tests 2 8 Mechanical properties 2 9 Electrical properties 2 10 Continuity of coating 2 11 Retests 2 12 Packing and marking 3 Appendix A Information to be supplied by the purchaser 5 Appendix B Factors for the conver
9、sion of electrical resistance to 20 C 5 Table 1 Tolerances on diameter 1 Table 2 Properties of copper-covered steel wire for telephone and telegraph purposes 4 Table 3 Factors for the conversion of electrical resistance to 20 C 5 Publications referred to Inside back coverBS4087:1989 ii BSI 07-1999 F
10、oreword This British Standard has been prepared under the direction of the Iron and Steel Standards Policy Committee and is a revision of BS4087:1966 which is withdrawn. This standard specifies the properties of wire which has been copper-covered by the electrolytic deposition process. Copper-covere
11、d steel wire manufactured by a different process may be supplied provided that all the requirements of this standard are met. In this revision all references to Imperial units have been deleted, small changes to phosphorous and sulphur limits are incorporated and reference to the rate of twisting in
12、 the torsion tests has been deleted. 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. Summ
13、ary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, 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 fro
14、nt cover.BS4087:1989 BSI 07-1999 1 1 Scope This British Standard specifies the electrical and mechanical properties of cold drawn copper-covered steel wire for telephone and telegraph purposes, with two grades of conductivity and three of tensile strength (expressed as minimum breaking load) for a r
15、ange of wire diameters from0.51mm to4.88mm together with diameter tolerances for a range of nominal wire diameters. NOTE 1The information to be supplied by the purchaser in the enquiry and order is given in Appendix A. NOTE 2The titles of the publications referred to in this standard are listed on i
16、nside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 coil a single length of finished wire, without joint or splice of any description, wound in close packed concentric rings 2.2 reel a cylindrical former with end flanges, constructed from wo
17、od, metal or plastics materials NOTEWhere the flanges are detachable (described as collapsible reel) the wire supported on the cylindrical former should still be described as a reel for the purposes of this standard. 2.3 batch any quantity of finished wire, presented for examination and test at any
18、one time 2.4 test piece a length of wire taken for test in accordance with this standard 2.5 sample one or more test pieces selected from a batch 3 Manufacture The wire shall be drawn from a copper-covered steel core of rod or wire. The steel core shall contain not more than 0.040% each of sulphur o
19、r phosphorus by cast analysis. The copper coating shall be securely bonded to the steel. There shall be no weld or joint made in the rod or wire after copper coating. 4 Quality of finished wire The finished wire shall be well and cleanly drawn to the dimensions specified in Table 2 and the copper co
20、ating shall be free from harmful defects and shall remain bonded to the steel. 5 Tolerances 5.1 Tolerance on diameter The tolerance on the nominal coated wire diameter shall be as given in Table 1. The nominal coated diameter of the wire shall be the mean of the two measurements made at right angles
21、 to each other. Table 1 Tolerances on diameter 5.2 Concentricity of the copper coating The minimum coating thickness, expressed as a percentage of the theoretical average thickness, shall be 95% for all sizes. The measurement shall be made by microscopic examination at a magnification of 200. The ca
22、lculated minimum coating thicknesses for a range of sizes between0.51mm and4.88mm and for30% and40% conductivity shall be as given in Table 2. NOTEThe theoretical average coating thickness T (in%) for any percentage by mass can be determined by the equation: where D is the diameter of conductor (in
23、mm); A sis the area of steel (in%). The area of steel A sas a percentage of total is given by the equation: where W sis the steel mass as percentage of total (in%); W cis the copper mass as percentage of total (in%). For the purpose of this calculation the copper mass as a percentage of the total is
24、 26% total mass for 30 % conductivity and 37.5 % total mass for40 % conductivity. 6 Inspection and testing Selection and testing of test pieces for all tests shall be carried out at the manufacturers works in accordance with clauses 7, 8, 9 and 10. Nominal coated wire diameter Tolerance Over Up to a
25、nd including mm 0.50 1.27 2.50 mm 1.27 2.50 4.88 mm 0.013 0.025 1% of the diameter T 0.5DD A s 100 - = A s 100 W s W s 0.8752W c + - =BS4087:1989 2 BSI 07-1999 NOTEIf the purchaser or his representative wishes to witness the selection of the test samples and the tests, this should be stated on the o
26、rder (see Appendix A). 7 Selection of test pieces and number of tests Test pieces of appropriate length for the tests specified in clauses 8, 9 and 10 shall be cut from each end of finished coils at the rate of one coil for every10 coils or part thereof in any one batch. If wire is supplied on reels
27、, the test piece shall be taken from the outer end of each reel. At least one test for concentricity shall be carried out for each batch of wire. NOTEThe test pieces should be made as straight as possible and precautions should be taken so not to damage the wire coating. 8 Mechanical properties 8.1
28、Tensile strength When tested in accordance with BS4545, the minimum breaking load of the test piece shall comply with the appropriate value given in Table 2. 8.2 Torsion When tested in accordance with BS 4545, the test piece shall withstand, without sign of failure, a minimum of 20 twists on a lengt
29、h equivalent to 100 diameters. The test shall be continued until fracture occurs. The copper coating shall not separate from the steel core. The fracture faces shall be at right angles to the axis of the wire. 9 Electrical properties 9.1 The electrical resistance of the test piece selected in accord
30、ance with clause 7 and determined in accordance with the method specified in BS5714 and multiplied by the expression given below shall not exceed the value given in Table 2 for the appropriate nominal diameter of wire. where K is the nominal mass per kilometer (in kg/km); W is the mass per kilometer
31、 of the test piece (inkg/km); C is where t is the temperature (in C) (see Table 3). NOTEFor temperature conversion factors see Table 3 of Appendix B. 9.2 The resistivity at 20 C of wire at 30% and 40% nominal conductivity shall not exceed the following: a) 0.058 62 7mm 2 /m at 30% nominal conductivi
32、ty; b) 0.043 96 7mm 2 /m at 40% nominal conductivity. NOTEThe nominal conductivity values adopted in this standard are based on the standard value for annealed high conductivity copper as laid down by the International Electrotechnical Commission. The corresponding resistivity values will be found t
33、o be only approximately equivalent to 30% and 40% of the conductivity of annealed high conductivity copper hence the use of the term “nominal conductivity”. 10 Continuity of coating 10.1 The test piece shall show no blue discoloration when tested as described in 10.2 or, in case of dispute, in 10.3.
34、 10.2 The test piece shall be wound eight times round a mandrel of its own diameter. The test piece shall then be immersed in a 1 : 1 solution of hydrochloric acid (d = 1.19) for 3min. The test piece after rinsing in water shall be immersed for2min in a solution of10g of potassium ferricyanide in100
35、0mL of distilled water to which is added11mL of sulphuric acid (d = 1.84), The temperature of the solution shall be between15 C and20 C. On removal from the solution, the test piece shall be inspected visually without magnification. 10.3 In case of dispute the same test piece shall be cleaned by imm
36、ersion in nitric acid (d = 1.42) for 10 s and thoroughly washed. The full procedure detailed in10.2 shall then be repeated and if the test piece then shows no blue discoloration, it shall be deemed to comply with this British Standard. 11 Retests Should a test piece fail to meet any one of the requi
37、rements of this standard, two further tests in respect of the same requirement shall be made on test pieces taken from the same coil or reel. Provided the results of both these further tests meet the requirements, all the material represented shall be deemed to comply with this British Standard. If
38、after retests 10% or more of the selected coils or reels fail the batch from which they were taken is deemed not to comply with this British Standard. W K - C 1 10.00378t 20 () + -BS4087:1989 BSI 07-1999 3 12 Packing and marking 12.1 Wire shall be supplied in coils or on reels. NOTEThe size of the c
39、oils or reels should be agreed between the manufacturer and the purchaser see Appendix A). 12.2 Each coil or reel shall have securely attached a durable label showing the following: a) the manufacturers name; b) the number of this British Standard, i.e.BS4087 1) ; c) the size and grade of material.
40、NOTE 1Wrapping and protective covering should be agreed between the manufacturer and the purchaser (see Appendix A). NOTE 2Other information and marking to be shown on the label should be the subject of agreement between the manufacturer and the purchaser (see Appendix A). 1) Marking BS 4087 on or i
41、n relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of this standard, The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration
42、 is not to be confused with third party certification of conformity, which may also be desirable.BS 4087:1989 4 BSI 07-1999 Table 2 Properties of copper-covered steel wire for telephone and telegraph purposes Nominal diameter Maximum electrical resistance at 20 0 C a Minimum copper thickness Nominal
43、 mass Tensile strength grade (expressed as minimum breaking load) Grade 1 Grade 2 Grade 3 30% conductivity 40% conductivity 30% conductivity 40% conductivity 30% conductivity 40% conductivity 30% conductivity 40% conductivity 30% conductivity 40% conductivity mm ohm/km ohm/km mm mm kg/km N N N N N N
44、 4.88 4.62 4.47 4.06 3.66 3.25 2.95 2.90 2.64 2.59 2.34 2.03 1.83 1.63 1.42 1.22 1.14 1.02 0.91 0.81 0.71 0.61 0.56 0.51 3.138 3.494 3.734 4.518 5.577 7.060 8.594 8.836 10.69 11.14 13.66 18.08 22.31 28.25 36.87 50.19 56.50 72.33 89.29 113.3 147.5 200.8 239.0 289.2 2.354 2.622 2.801 3.389 4.183 5.295
45、 6.450 6.630 8.022 8.357 10.25 13.56 16.74 21.19 27.64 37.66 42.35 54.23 66.98 84.94 110.7 150.7 179.3 217.0 0.28 0.27 0.26 0.23 0.21 0.19 0.17 0.17 0.15 0.15 0.13 0.12 0.10 0.10 0.08 0.07 0.07 0.06 0.05 0.05 0.04 0.04 0.03 0.03 0.44 0.42 0.40 0.37 0.33 0.29 0.26 0.26 0.24 0.23 0.21 0.18 0.16 0.15 0
46、.13 0.11 0.10 0.09 0.08 0.07 0.06 0.06 0.05 0.05 152.2 136.7 128.0 105.7 85.63 67.67 55.55 54.06 44.65 42.87 34.98 26.41 21.38 16.83 12.94 9.498 8.458 6.623 5.350 4.219 3.230 2.388 1.993 1.652 15840 14460 13530 11 630 9780 8010 6820 6630 5710 5470 4460 3600 2780 2190 1680 1230 1100 850 700 550 420 3
47、00 250 220 14290 13070 12420 10560 8910 7330 6260 6090 5240 5030 4100 3420 2540 2000 1530 1130 1000 780 640 500 380 280 240 200 18800 17410 16300 14090 11880 9730 8180 7960 6610 6490 5110 4000 3080 2430 1860 1360 1220 950 760 610 470 340 280 240 5890 5650 4600 3720 2800 2220 1700 1250 1110 860 710 5
48、50 420 310 260 220 1460 1140 920 730 560 410 340 280 1320 1030 830 660 500 370 310 250 a The maximum resistance figures are based on the nominal diameter of the wire and the resistivity values appropriate to the percentage conductivity of the wire.BS4087:1989 BSI 07-1999 5 Appendix A Information to
49、be supplied by the purchaser The following information should be given in the enquiry and order to assist the manufacturer in supplying the correct material: a) the number of this standard, i.e. BS 4087; b) the nominal coated wire diameter in millimetres; c) the.tensile strength grade; d) the percentage conductivity; e) the form of sup
