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1、BRITISH STANDARD BS 1977:1976 Specification for High conductivity copper tubes for electrical purposes UDC 669.3 462:621.3 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 This British Standard, having been prepared under the dir
2、ection of the Non-ferrous Metals Standards Committee, was published under the authority of the Executive Board on 31 August 1976 BSI 08-1999 First published May 1953 First revision July 1963 Second revision August 1976 The following BSI references relate to the work on this standard: Committee refer
3、ence NFE/17 Draft for comment 74/42210 DC ISBN 0 580 09085 X Cooperating organizations The Non-ferrous Metals Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizati
4、ons: The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Aluminium FederationInstitution of Structural Enginee
5、rs Association of Bronze and Brass FoundersLead Development Association British Electrical and Allied Manufacturers Light Metal Founders Association Association*London Metal Exchange British Lead Manufacturers AssociationMagnesium Industry Council British Non-ferrous Metals Federation*Ministry of De
6、fence* British Non-ferrous Metals Technology National Brassfoundry Association Centre*Non-ferrous Metal Stockists* Copper Development Association*Post Office Electric Cable Makers ConfederationRoyal Institute of British Architects Institute of British FoundrymenSociety of Motor Manufacturers and Tra
7、ders Institution of Mechanical Engineers Limited (Automobile Division)Tin Research Institute Institution of Mining and MetallurgyZinc Development Association Institution of Production EngineersIndividual manufacturers British Gas CorporationInstitution of Heating and Ventilating Copper Tube Fittings
8、 Manufacturers Engineers AssociationInstitution of Mechanical Engineers Department of the EnvironmentNational Association of Plumbing, Heating and Electricity Supply Industry in England and Mechanical Services Contractors WalesNational Water Council Engineering Industries AssociationOil Companies Ma
9、terials Association Institution of Gas EngineersThames Water Authority, Metropolitan Water Division Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 BSI 08-1999i C
10、ontents Page Cooperating organizationsInside front cover Forewordii 1 Scope1 2 References1 3 Information to be supplied by the purchaser1 4 Freedom from defects1 5 Manufacture1 6 Chemical composition1 7 Condition and mechanical properties1 8 Dimensions and tolerances1 9 Selection of test samples2 10
11、 Mechanical tests3 11 Electrical resistivity test3 12 Gassing or hydrogen embrittlement test3 13 Retests4 14 Suppliers certificate4 15 Inspection4 16 Facilities for testing4 17 Rounding of numbers rule7 Figure 1 Flattening test piece3 Figure 2 Double-bend test piece3 Figure 3 Gassing or hydrogen emb
12、rittlement test piece3 Table 1 Mechanical properties1 Table 2 Preferred sizes of round tubes2 Table 3 Tolerances on outside diameter2 Table 4 Tolerances on length of round tubes2 Table 5 Volume resistivity values3 Table 6 Factors for correcting resistance, as-drawn high conductivity copper, 97 % IAC
13、S5 Table 7 Factors for correcting resistance, annealed high conductivity copper, 100 % IACS6 Table 8 Rounding rule7 Publications referred to8 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 ii BSI 08-1999 Foreword This British S
14、tandard is the first revision in metric terms of BS 1977 and is one of a series of standards for copper for electrical purposes, the others being BS 1432, BS 1433, BS 1434, BS 4109 and BS 4608. This standard covers only high conductivity copper tubes for electrical purposes while tubes for general p
15、urposes are covered by BS 2871. The tolerances specified in this standard are in line with BS 2871. An extension of the size range of up to 400 mm outside diameter has been made and an additional material designation C110 complying with the requirements of BS 1954 is also included in this revision.
16、Due regard has been given to the work of the International Organization for Standardization (ISO) on testing requirements, properties etc. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. A British Standard does not purport to inc
17、lude 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 This document comprises a front cover, an inside front cover, page
18、s i and ii, pages 1 to 8, 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+
19、00:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 BSI 08-19991 1 Scope This British Standard specifies requirements for round, square and rectangular solid drawn copper tubes of high conductivity for electrical purposes. 2 References The titles of the publications referred to in this standard are
20、listed on page 8. 3 Information to be supplied by the purchaser The purchaser shall state on his enquiry and order the following information. a) The chemical composition of the material (see clause 6). b) The dimensions of the material (see 8.1). c) The condition of the material where required (see
21、clause 7). d) Whether mechanical tests are required (see 9.1 and clause 10). e) Whether an electrical resistivity test is required (see 9.2 and clause 11). f) In the case of oxygen-free material, i.e. C103 and C110, whether a gassing or hydrogen embrittlement test is required (see 9.3 and clause 12)
22、. g) Whether a suppliers certificate is required (see clause 14). h) Whether it is the purchasers intention to inspect the material at the suppliers works (see clause 15). j) If material C110 is specified, whether it is also required to satisfy the requirements of BS 3839 (see clause 12). 4 Freedom
23、from defects Tubes shall be clean, smooth and free from harmful defects. 5 Manufacture Tubes shall be solid drawn and in no case shall they be re-drawn from used tubes. Unless otherwise ordered they shall be supplied in straight lengths; the ends shall be cut clean and square with the axis of the tu
24、be. 6 Chemical composition Tubes shall be manufactured from copper complying with the requirements of one of the following British Standards as specified by the purchaser. BS 1036, material designated C101. BS 1037, material designated C102. BS 1861, material designated C103. BS 1954, material desig
25、nated C110. When specified by the purchaser, material designated C110 shall also satisfy the requirements of BS 3839. If no British Standard is stipulated by the purchaser, the supplier shall be at liberty to supply at his discretion material complying with the requirements of any one of the above s
26、tandards. 7 Condition and mechanical properties The material shall be supplied in one of the following conditions as specified by the purchaser and in accordance with the mechanical properties specified in Table 1. Table 1 Mechanical properties Unless otherwise specified by the purchaser, tubes shal
27、l be supplied in the as-drawn condition. Such tubes may be subject to a stress-relieving treatment after the final draw at the option of the supplier. 8 Dimensions and tolerances 8.1 Dimensions 8.1.1 Round tubes. Round tubes shall be designated by the outside diameter and wall thickness in millimetr
28、es. A list of preferred sizes is given in Table 2. OMaterial in the annealed condition. M Material in the as-drawn condition. ConditionTensile strengthElongation on gauge length of 5. 65 Typical hardnessa min.max.min. N/mm2 (= MPa) N/mm2 (= MPa) %HV 5 O2002504050 M270100 NOTESo is the original cross
29、-sectional area. a For information only. So Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 2 BSI 08-1999 Table 2 Preferred sizes of round tubes 8.1.2 Square and rectangular tubes. Where square or rectangular tubes are specified
30、 these shall be designated by: a) in the case of square tubes, the outside dimension of one side and the thickness of the wall in millimetres; b) in the case of rectangular tubes, the outside dimensions of two adjoining sides together with the thickness of the wall in millimetres. 8.2 Tolerances on
31、round tubes 8.2.1 Outside diameter. The mean outside diameter of round tubes shall not vary from the specified outside diameter by more than the amount of the tolerances specified in Table 3. The mean outside diameter is half the sum of two diameters at right angles on one cross section of the tube.
32、 Table 3 Tolerances on outside diameter 8.2.2 Thickness. The thickness of round tubes at any point shall not vary from the specified thickness by more than 10 % for tubes up to and including 108 mm outside diameter, and by not more than 12.5 % for tubes greater than 108 mm outside diameter. 8.2.3 Le
33、ngth. Round tubes up to and including 108 mm outside diameter ordered to a specified length shall not vary from that length by more than the amount of the tolerances specified in Table 4. Table 4 Tolerances on length of round tubes For tubes greater than 108 mm outside diameter or greater than 10 m
34、in length, the tolerances on length shall be agreed between the purchaser and the supplier. 8.3 Tolerances on square and rectangular tubes. The dimensional tolerances on square and rectangular tubes shall be agreed between the purchaser and the supplier. 9 Selection of test samples 9.1 Mechanical te
35、sts. When mechanical tests are specified by the purchaser, tubes of any one composition, size, thickness and temper shall be grouped in batches of 300 tubes or 1 300 kg, whichever is the greater mass, and the purchaser or his representative shall take at random one tube from each batch and any remai
36、ning part of a batch for testing. When the size of the order does not permit batching in the above quantities, one tube of each composition, size, thickness and temper shall be selected for testing. 9.2 Electrical resistivity test. When this test is specified by the purchaser, the selection of test
37、samples and the number of tests to be carried out shall be agreed between the supplier and the purchaser. 9.3 Gassing or hydrogen embrittlement test. When this test is specified by the purchaser, the selection of test samples and the number of tests to be carried out shall be agreed between the supp
38、lier and the purchaser. Outside diameter Wall thickness mmmm 25 50 63 76 108 1.5 1.5 2.0 2.0 2.0 2.0 2.5 2.5 2.5 2.5 2.5 3.0 3.0 3.0 3.0 3.0 3.5 Outside diameterTolerance on mean outside diameter OverUp to and including mmmmmm 10 16 30 50 80 130 190 260 320 10 16 30 50 80 130 190 260 320 400 0.08 0.
39、10 0.12 0.15 0.20 0.25 0.50 0.80 1.00 1.25 LengthTolerance on length MO mmmm Up to and including 3 m+ 4 p 0 +6 p0 Greater than 3 m up to and including 6 m + 6 p 0 + 10 p 0 Greater than 6 m up to and including 10 m + 8 p 0 + 12 p 0 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:56 GMT+0
40、0:00 2006, Uncontrolled Copy, (c) BSI BS 1977:1976 BSI 08-19993 10 Mechanical tests 10.1 Tensile test. Tensile tests shall be made on pieces of tube tested in full section or on longitudinal strips cut from any part of the tube. The tests shall be made in accordance with BS 18-1 and the values obtai
41、ned shall comply with the appropriate requirements given in Table 1. 10.2 Flattening test (for round tubes not exceeding 108 mm outside diameter). The test piece shall be annealed before flattening unless the tube is supplied in the annealed condition. A piece of the tube shall be flattened down unt
42、il the interior surface meets as shown in Figure 1 without showing any crack or flaw. 10.3 Double-bend test (for round tubes over 108 mm outside diameter). The test piece shall be annealed before flattening unless the tube is supplied in the annealed condition. A test piece 50 mm wide shall be cut l
43、ongitudinally from the tube, flattened and its longer edges carefully rounded and smoothed longitudinally so that a cross-section has approximately semi-circular ends. The test piece shall then have its ends bent through 180 in opposite directions and doubled up close, as shown in Figure 2 without s
44、howing any crack or flaw. 11 Electrical resistivity test 11.1 Methods. The volume resistivity, if specified by the purchaser, shall be determined in accordance with one of the methods given in BS 3239. The routine method shall ordinarily be used but in the case of dispute the reference method shall
45、be used. The volume resistivity shall be determined by one of the following methods in accordance with Table 5: a) by direct measurement on the tubes; or b) on wire drawn from the tubes and annealed. 11.2 Results. The standard value at 20 C for the volume resistivity of annealed high conductivity co
46、pper shall be taken as 0.017 241 47 m. The volume resistivity of the material measured in accordance with 11.1 and using the factors given in Table 6 and Table 7 shall not exceed the appropriate values given in Table 5. Table 5 Volume resistivity values 12 Gassing or hydrogen embrittlement test The
47、gassing or hydrogen embrittlement test if specified by the purchaser shall be made on material C103 and C110 only. This test is not applicable in cases where the material C110 is also required to comply with BS 3839. The test shall be made on a test piece of convenient size (full section or a strip
48、cut from the tube) which shall not be flattened before testing. When a strip is used the edges shall be carefully rounded and smoothed longitudinally. After being exposed to an atmosphere containing not less than 10 % of hydrogen for 20 min at 825 C to 875 C and subsequently cooled, the test piece s
49、hall, without showing any crack or flaw: a) in the case of tubes in full section, be flattened close; b) in the case of strip cut from the tube, be bent by steadily applied pressure or a succession of blows at right angles to the length AC and flattened close until A assumes the position indicated by D as shown in Figure 3, where AB indicates the original position of the test piece. Figure 1 Flattening test piece Figure 2 Double-bend test piece ConditionMethod (see 11.1) Volume resistivity at 20 C Cond