1、 TECHNICAL REPORT IEC TR 60344Third edition 2007-02Calculation 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 design
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10、t 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 FOREWORD 1) The I
11、nternational 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 electrical and e
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13、ttees; 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 Organization fo
14、r 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 technical committee
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20、eferences 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 held responsible
21、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. The main task of
22、 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 the art”. This th
23、ird 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 of the calculation me
24、thod 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/DTR 46C/795A/RVC Full
25、 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 publication will remain unc
26、hanged 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 this publication may b
27、e 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 general method for calcula
28、ting 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 = R 0k 1k 2k 3k 4/km where 2 0 95 , 21 nd R = n is the number of strands in the conductor (for a solid conductor n = 1); d is the nomina
29、l diameter of the strands in the conductor, in millimetres, or, for a solid conductor, its nominal diameter; k 1 is a factor depending on the diameter of the strands and on plain or coated conductor. Values for k 1are given in Table 1; k 2 is a factor depending on the type of conductor; the value is
30、 equal to 1,00 for solid conductors; 1,04 for stranded conductors; k 3is a twisting factor depending on conductor dimension and the way the insulated conductors are twisted together (for single wires k 3= 1). Values for k 3are given in Table 2; k 4 is, for cabIes with more than one cabling element,
31、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 k 4are given in Table 3. Values o
32、f R are given in Table 4. These values are calculated with different coefficients k 1 , k 2 , k 3 , k 4 . 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, and fou
33、r 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 k 1Solid conductor Stranded conductor Nominal diameter of strands in conductor mm Nickel coa
34、ted 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 1,04 1,
35、03 1,03 1,02 Table 2 Twisting lay factor Values of k 3Nominal 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 ratio of tw
36、isting lay length to overall diameter of the twisted insulated conductors. Table 3 Cabling lay factor Values of k 4Nominal 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 Iay fac
37、tor is the ratio of stranding lay to overall diameter of the assembled layer. NOTE 2 For screened wires, k 4is 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 diameter mm k 1k 2k
38、3k 4Calculated 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 1,00 576,188 592,650 636,5
39、50 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 1,00 141,303 144,04
40、7 148,368 152,819 155,022 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 1,05 1,00 1,00 1,
41、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 (continued) Strande
42、d conductor Coefficients Nominal conductor section area (number of strands nominal diameter of strand in mm) k 1k 2k 3k 4Calculated 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 1,04 1,04 1,04
43、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 1,20 1,04 1,0
44、4 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 84,789 7 87,235
45、 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 1,02 1,02 1,00
46、 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 1,04 1,04 1,04 1,
47、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 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
