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1、 TECHNICAL REPORT IEC TR 60344 Third edition 2007-02 Calculation of d.c. resistance of plain and coated copper conductors of low-frequency cables and wires Application guide Reference number IEC/TR 60344:2007(E) Publication numbering As from 1 January 1997 all IEC publications are issued with a desi
2、gnation in the 60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base publication incorporat
3、ing amendment 1 and the base publication incorporating amendments 1 and 2. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to this publication,
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7、 Centre (see below) for further information. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00 -,-,- TECHNICAL REPORT IEC TR 60344 Thir
8、d edition 2007-02 Calculation of d.c. resistance of plain and coated copper conductors of low-frequency cables and wires Application guide PRICE CODE IEC 2007 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanic
9、al, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch G For price,
10、see current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission -,-,- 2 TR 60344 IEC:2007(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CALCULATION OF DC RESISTANCE OF PLAIN AND COATED COPPER CONDUCTORS OF LOW-FREQUENCY CABLES AND WIRES APPLICATION GUIDE F
11、OREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the
12、electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to
13、 technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International
14、 Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each tec
15、hnical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Pub
16、lications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their na
17、tional and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to
18、 be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Commi
19、ttees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to
20、 the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be h
21、eld responsible for identifying any or all such patent rights. IEC 60344, which is a Technical Report, has been prepared by subcommittee 46C: Wires and symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, r.f. connectors, r.f. and microwave passive components and accessories.
22、The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of t
23、he art”. This third edition cancels and replaces the second edition published in 1980 and amendment 1 (1985). This edition constitutes a technical revision. -,-,- TR 60344 IEC:2007(E) 3 This edition includes the following significant technical change with respect to the previous edition: improvement
24、 of the calculation method of the resistance of copper conductors. the content was considered more appropriate for the publication of a Technical Report rather than a International Standard. The text of this technical report is based on the following documents: Enquiry draft Report on voting 46C/761
25、/DTR 46C/795A/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publi
26、cation will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A bilingual version of
27、this publication may be issued at a later date. 4 TR 60344 IEC:2007(E) CALCULATION OF DC RESISTANCE OF PLAIN AND COATED COPPER CONDUCTORS OF LOW-FREQUENCY CABLES AND WIRES APPLICATION GUIDE 1 Scope This Technical Report applies to low-frequency cables and wires for telecommunication and gives a gene
28、ral method for calculating the resistance of copper conductors. 2 General method of calculation The maximum conductor resistance, R, at 20 C of insulated copper conductors is equal to R = R0 k1 k2 k3 k4 /km where 2 0 95,21 nd R= n is the number of strands in the conductor (for a solid conductor n =
29、1); d is the nominal diameter of the strands in the conductor, in millimetres, or, for a solid conductor, its nominal diameter; k1 is a factor depending on the diameter of the strands and on plain or coated conductor. Values for k1 are given in Table 1; k2 is a factor depending on the type of conduc
30、tor; the value is equal to 1,00 for solid conductors; 1,04 for stranded conductors; k3 is a twisting factor depending on conductor dimension and the way the insulated conductors are twisted together (for single wires k3 = 1). Values for k3 are given in Table 2; k4 is, for cabIes with more than one c
31、abling element, a cabling factor depending on conductor size and on the way the cabling elements are assembled, or, for cables with one cabling element and for screened wires up to and including five insulated conductors, an elongation factor depending on conductor size. VaIues for k4 are given in T
32、able 3. Values of R are given in Table 4. These values are calculated with different coefficients k1, k2, k3, k4. The result of the calculations is given with six significant figures. In publications, the value chosen in this table shall be indicated with three significant figures for R below 1 000,
33、 and four significant figures from 1 000; for this the table value shall be rounded off to the nearest value. NOTE The copper conductivity is 58 m/mm. TR 60344 IEC:2007(E) 5 Table 1 Strand nominal diameter Values of k1 Solid conductor Stranded conductor Nominal diameter of strands in conductor mm Ni
34、ckel coated Tinned Plain or silver plated Nickel coated Tinned Plain or silver plated Over 0,05 up to and including 0,10 1,20 1,12 1,07 Over 0,10 up to and including 0,31 1,16 1,08 1,05 1,15 1,07 1,04 Over 0,31 up to and including 0,91 1,13 1,05 1,03 1,12 1,04 1,02 Over 0,91 up to and including 3,60
35、 1,04 1,03 1,03 1,02 Table 2 Twisting lay factor Values of k3 Nominal diameter of solid conductors d mm Nominal section of stranded conductors S mm Twisting lay factor d 0,8 0,8 d 0,4 d S 0,15 S 16 1,02 1,03 1,04 1,02 1,03 1,04 16 1,05 1,06 1,07 1,05 1,06 1,07 NOTE The twisting Iay factor is the rat
36、io of twisting lay length to overall diameter of the twisted insulated conductors. Table 3 Cabling lay factor Values of k4 Nominal diameter of solid conductors d mm Nominal section of stranded conductors S mm Cabling lay factor d 0,8 d 16 1,02 1,03 1,02 1,03 16 1,05 1,06 1,05 1,06 NOTE 1 The cabling
37、 Iay factor is the ratio of stranding lay to overall diameter of the assembled layer. NOTE 2 For screened wires, k4 is determined by reference to the value associated with a cabling lay factor greater than 16. -,-,- 6 TR 60344 IEC:2007(E) Table 4 Solid conductor Coefficients Nominal conductor diamet
38、er mm k1 k2 k3 k4 Calculated resistance /km 0,12 1,05 1,08 1,16 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1 600,52 1 646,25 1 768,19 0,15 1,05 1,08 1,16 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1 024,33 1 053,60 1 131,64 0,20 1,05 1,08 1,16 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 576,188
39、 592,650 636,550 0,25 1,05 1,08 1,16 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 368,760 379,296 407,392 0,32 1,03 1,05 1,13 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,00 220,786 225,073 242,222 0,40 1,03 1,05 1,05 1,05 1,13 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,03 1,03 1,00 1,00 1,00 1,00 1,03 1,00
40、141,303 144,047 148,368 152,819 155,022 0,50 1,03 1,05 1,05 1,05 1,13 1,00 1,00 1,00 1,00 1,00 1,00 1,00 1,03 1,03 1,00 1,00 1,00 1,00 1,03 1,00 90,434 0 92,190 0 94,955 7 97,804 4 99,214 0 0,60 1,05 1,05 1,05 1,00 1,00 1,00 1,00 1,03 1,03 1,00 1,00 1,03 64,020 8 65,941 5 67,9I9 7 0,80 1,05 1,05 1,0
41、5 1,00 1,00 1,00 1,00 1,02 1,02 1,00 1,00 1,02 36,011 7 36,732 0 37,466 6 1,00 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,02 1,02 1,00 1,00 1,02 22,828 0 23,284 6 23,750 3 1,4 (1,38) 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,02 1,02 1,00 1,00 1,02 11,987 0 12,226 7 12,471 3 TR 60344 IEC:2007(E) 7 Table 4 (cont
42、inued) Stranded conductor Coefficients Nominal conductor section area (number of strands nominal diameter of strand in mm) k1 k2 k3 k4 Calculated resistance Ohm/km 0,035 mm (7 0,08) 1,07 1,12 1,20 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 545,222 570,700 611,464 0,055 mm (7 0,10) 1,07 1,12 1,20 1
43、,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 348,942 365,248 391,337 0,079 mm (7 0,12) 1,04 1,07 1,15 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 235,527 242,321 260,438 0,124 mm (7 0,15) 1,04 1,07 1,15 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 150,737 155,085 166,681 0,150 mm (19 0,10) 1,07 1,12
44、 1,20 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 128,558 134,565 144,177 0,210 mm (19 0,12) 1,04 1,07 1,15 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 86,773 1 89,276 2 95,951 0 0,220 mm (7 0,20) 1,04 1,07 1,07 1,07 1,15 1,04 1,04 1,04 1,04 1,04 1,00 1,00 1,03 1,03 1,03 1,00 1,00 1,00 1,03 1,00 8
45、4,789 7 87,235 6 89,852 6 92,548 2 93,757 9 0,340 mm (7 0,25) 1,04 1,07 1,15 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 54,265 4 55,830 8 60,005 0 0,340 mm (19 0,15) 1,04 1,07 1,15 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 55,534 8 57,136 7 61,408 7 (28 0,15) 1,07 1,07 1,07 1,04 1,04 1,04 1,00
46、1,02 1,02 1,00 1,00 1,00 38,771 4 39,546 8 40,337 7 0,500 mm (16 0,20) 1,07 1,07 1,07 1,04 1,04 1,04 1,00 1,02 1,02 1,00 1,00 1,02 38,165 6 38,928 9 39,707 5 0,560 mm (7 0,32) 1,02 1,04 1,12 1,04 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 32,484 0 33,121 0 35,668 7 0,600 mm (19 0,20) 1,04 1,07 1,15 1,0
47、4 1,04 1,04 1,00 1,00 1,00 1,00 1,00 1,00 31,258 3 32,139 4 34,542 4 (42 0,15) 1,07 1,07 1,07 1,04 1,04 1,04 1,00 1,02 1,02 1,00 1,00 1,02 25,847 6 26,364 5 26,891 8 0,750 mm (24 0,20) 1,07 1,07 1,07 1,04 1,04 1,04 1,00 1,02 1,02 1,00 1,00 1,02 25,443 7 25,952 6 26,471 6 1,000 mm (32 0,20) 1,07 1,07
48、 1,07 1,04 1,04 1,04 1,00 1,02 1,02 1,00 1,00 1,02 19,082 8 19,464 4 19,853 7 1,500 mm (30 0,25) 1,07 1,07 1,07 1,04 1,04 1,04 1,00 1,02 1,02 1,00 1,00 1,02 13,027 2 13,287 7 13,553 5 _ -,-,- ISBN 2-8318-8998-7 -:HSMINB=: ICS 29.060.01 Typeset and printed by the IEC Central Office GENEVA, SWITZERLAND -,-,-