1、BRITISH STANDARD BS EN 61232:1997 Incorporating Amendment No. 1 Aluminium-clad steel wires for electrical purposes The European Standard EN 61232:1995 with the incorporation of amendment A11:2000 has the status of a British Standard ICS 29.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED
2、 BY COPYRIGHT LAWBS EN 61232:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 07-2001 The following BSI references relate to the work on this s
3、tandard: Committee reference GEL/7 Draft for comment 90/46539 DC ISBN 0 580 23596 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GEL/7, Wrought aluminium for electrical purposes, upon which the following bodies were re
4、presented: Aluminium Federation British Cable Makers Confederation Electricity Association International Wire and Machinery Association Co-opted member Amendments issued since publication Amd. No. Date Comments 13083 July 2001 See national forewordBS EN 61232:1997 BSI 07-2001 i Contents Page Committ
5、ees responsible Inside front cover National foreword ii Foreword 2 Text of EN 61232 3BS EN 61232:1997 ii BSI 07-2001 National foreword This British Standard has been prepared by Technical Committee GEL/7 and is the English language version of EN 61232:1995 Aluminium-clad steel wires for electrical p
6、urposes, including amendment A11:2000, published by the European Committee for Electrotechnical Standardization (CENELEC). It was derived by CENELEC from IEC 61232:1993 published by the International Electrotechnical Commission (IEC). The CENELEC common modifications have been implemented at the app
7、ropriate places in the text. The start and finish of each common modification is indicated in the text by tags . Where a common modification has been introduced by amendment, the tags carry the number of the amendment. For example, the common modifications introduced by CENELEC amendment A11 are ind
8、icated by . Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index” or by using the “Find” facility of the BSI Stan
9、dards Electronic Catalogue. 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 pa
10、ges This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM
11、 EN 61232 March 1995 +A11 November 2000 ICS 29.060.10 Descriptors: Electric conductor, bare conductor, metallic wire, steel, aluminium covering, electrical property, mechanical property, test English version Aluminium-clad steel wires for electrical purposes (includes amendment A11:2000) (IEC 61232:
12、1993, modified) Fils dacier revtus daluminium pour usages lectriques (inclut lamendement A11:2000) (CEI 61232:1993, modifie) Aluminium-ummantelte Stahldrhte fr die Elektrotechnik (enthlt nderung A11:2000) (IEC 61232:1993, modifiziert) This European Standard was approved by CENELEC on 1994-12-06. Ame
13、ndment A11 was approved by CENELEC on 2000-01-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references c
14、oncerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member i
15、nto its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
16、Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC
17、members Ref. No. EN 61232:1995 + A11:2000 EEN 61232:1995 BSI 07-2001 2 Foreword The text of the International Standard IEC 1232:1993, prepared by IEC TC 7, Bare aluminium conductors, together with common modifications prepared by the Technical Committee CENELEC TC 7, was submitted to the formal vote
18、 and was approved by CENELEC as EN 61232 on 1994-12-06. The following dates were fixed: For products which have complied with the relevant national standard before 1995-12-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2
19、000-12-01. Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Foreword to amendment A11 This amendme
20、nt was prepared by the Technical Committee CENELEC TC7, Overhead electrical conductors. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A11 to EN 61232:1995 on 2000-01-01. The following dates were fixed: Annexes designated “normative” a
21、re part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZB and Annex ZC are informative. Contents Page Foreword 2 Introduction 2 1S c o p e 3 2 Normative references 3 3 Definitions 3 4 Requirements 3 5S a m p l i n g 4 6 Test meth
22、ods 5 7P a c k a g i n g 6 8 Acceptance and rejection 7 Annex A (informative) Ratio of aluminium and steel cross-sectional areas 9 Annex B (informative) Elongation 10 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publicatio
23、ns 11 Annex ZB (informative) Endurance tensile stress 11 Annex ZC (informative) A-deviations 12 Table 1 Nominal density of wires 7 Table 2 Tolerances on diameter of wires 7 Table 3 Minimum thickness of aluminium covering 7 Table 4 Initial settings for determining stress at 1 % extension and total el
24、ongation at fracture 7 Table 5 Tensile and resistivity requirements of wires (before stranding) 8 Table A.1 Classification of aluminium-clad steel wires 9 Table A.2 Standard ratio of aluminium and steel 9 Table A.3 Conductivity 9 Table A.4 Aluminium thickness 10 Table A.5 Physical constants 10 Intro
25、duction Aluminium-clad steel wires have been used as all aluminium-clad steel stranded wires for overhead ground wire purposes and as reinforcement of aluminium conductors for over-head line conductor purposes. In some cases, they are also used as phase conductors. Since various national standards e
26、xist in each country for the aluminium-clad steel wires, this International Standard establishes the requirements for properties. It should be noted that this standard has been prepared after consideration of the existing IEC 888. latest date by which the EN has to be implemented at national level b
27、y publication of an identical national standard or by endorsement (dop) 1995-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1995-12-01 latest date by which the amendment has to be implemented at national level by publication of an identical natio
28、nal standard or by endorsement (dop) 2001-05-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2003-01-01EN 61232:1995 BSI 07-2001 3 1 Scope This International Standard applies to bare, hard-drawn, round, aluminium-clad steel wires of different
29、electrical and mechanical properties, in the diameter ranges shown in Table 5, for electrical purposes, before stranding. It is intended to cover applications, for reinforcement in aluminium conductors and for all aluminium-clad steel stranded conductors. It does not cover the wires for redrawing pu
30、rposes. 2 Normative references The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties t
31、o agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 468:1974, Method of measurement of
32、resistivity of metallic materials. 3 Definitions For the purpose of this International Standard, the following definitions apply: 3.1 aluminium-clad steel wire round wire consisting of a round steel core with a uniform and continuous aluminium covering 3.2 diameter mean of two measurements at right
33、angles taken at the same cross-section 3.3 class aluminium-clad steel wires defined as “20SA”, “27SA”, “30SA” and “40SA”, corresponding to their conductivity grades of 20,3 %, 27 %, 30 % and 40 % IACS 1) 3.4 type aluminium-clad steel wires of class 20SA are divided into two types, A and B, according
34、 to their tensile strength characteristics 4 Requirements 4.1 Materials 4.1.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or basic-oxygen process and shall be of such composition that the finished clad wire shall have the properties and characteristics given in this
35、standard. 4.1.2 The aluminium used for covering shall have a minimum purity of 99,5 % and quality sufficient to meet thickness and electrical resistance requirements of this standard. 4.2 Freedom from defects The wires shall be smooth and free from all imperfections such as fissures, roughness, groo
36、ves, inclusions or other defects which may endanger the performance of the product. 4.3 Density For the purpose of calculating the nominal mass of the wires, the density of the aluminium-clad steel wire shall be taken as shown in Table 1. 1) IACS: International Annealed Copper Standard.EN 61232:1995
37、 4 BSI 07-2001 4.4 Tolerances on nominal diameter of wires Aluminium-clad steel wires shall not depart from the nominal diameter by more than the amounts given in Table 2. 4.5 Minimum thickness of aluminium The minimum aluminium thickness of wires at any point shall comply with the requirements give
38、n in Table 3. 4.6 Tensile stress The wire shall comply with the requirements given in Table 5. In computing breaking load of a single wire from tensile stress, the actual diameter of the finished wire shall be used. 4.7 Elongation The wire shall comply with either the requirement of 1 % minimum elon
39、gation after fracture, or 1,5 % minimum total elongation at fracture, for, in both cases, a gauge length of 250 mm. Measurement shall be made either under no load after fracture or at the time of fracture by the use of a suitable extensometer. Unless otherwise agreed upon between the manufacturer an
40、d purchaser at the time of purchase, it is at the option of the manufacturer to select the measurement method. The test shall be made by only one of the two methods prescribed in 6.3.2. 4.8 Resistivity The maximum resistivity of wires shall conform to the requirements prescribed in Table 5 at the te
41、mperature of 20 C. 4.9 Torsion test The wire shall withstand, without fracture, not less than 20 twists in a length equivalent to 100 times the nominal diameter of the wire. The specimen, after twisting to destruction, shall show no separation of the aluminium from the steel when examined with the n
42、aked eye or with normal corrective glasses. 4.10 Stress at 1 % extension The wire shall conform to the requirement of stress at 1 % extension given in Table 5. The test shall be made on straight undeformed wires. 4.11 Joints 4.11.1 There shall be no joints of any kind made in the finished wire. Join
43、ts may be made in the wire rods prior to drawing to the finished wire. The finished wire at such joints shall meet the requirements of 4.5. 4.11.2 Jointing equipment and procedure shall be such that it can be demonstrated that the tensile stress of a finished wire specimen containing the jointed sec
44、tion shall be not less than 80 % of normal part, and also greater than 90 % of minimum specified value in Table 5. 4.11.3 Elongation, torsion and stress at 1 % extension tests are not required for jointed sections in a finished wire. 5 Sampling Samples for tests shall be taken by the manufacturer fr
45、om 10 % of the individual lengths of finished wire. In case of wire supply in large quantities and where the manufacturer has demonstrated capability of meeting or exceeding the requirements, the number of samples may be reduced, by agreement between the purchaser and the manufacturer, to a level wh
46、ich ensures that each production lot of wire is given an adequate monitoring.EN 61232:1995 BSI 07-2001 5 6 Test methods 6.1 Place of testing All tests shall be made at the manufacturers plant unless mutually agreed between the manufacturer and purchaser. 6.2 Tests The following tests numbers 1 to 9
47、shall be made on each of the samples before stranding. When the wires are to be used for products consisting of only aluminium-clad steel wires, it may be agreed between the manufacturer and the purchaser not to carry out test 9: 1) appearance; 2) finish; 3) diameter; 4) tensile stress; 5) elongatio
48、n; 6) torsion; 7) resistivity; 8) minimum aluminium thickness; 9) stress at 1 % extension. 6.3 Test method 6.3.1 Tensile test The breaking load of the specimen shall be determined by means of a suitable tensile testing machine. The load shall be applied gradually and the rate of separation of the ja
49、ws of the testing machine shall be not less than 25 mm per minute and not greater than 100 mm per minute. In calculating the tensile stress from the measured breaking load, the diameter of the finished wire before stressing shall be used. 6.3.2 Elongation tests The elongation tests may be made on the same samples in the same operation as the tensile test described in 6.3.1. a) Percentage elongation after fracture The ultimate elongation measured under no load shall be determined on the specimen. The specimen shall be straig
