1、 IEC/TR 60649 Edition 2.0 2007-11 TECHNICAL REPORT Calculation of maximum external diameter of cables for indoor installations IEC/TR 60649:2007(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publica
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9、indoor installations INTERNATIONAL ELECTROTECHNICAL COMMISSION G ICS 29.060.20 PRICE CODE ISBN 2-8318-9362-3 2 TR 60649 IEC:2007(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CALCULATION OF MAXIMUM EXTERNAL DIAMETER OF CABLES FOR INDOOR INSTALLATIONS FOREWORD 1) The International Electrotechnical C
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21、mple “state of the art“. IEC 60649, 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 This second edition cancels and replace
22、s the first edition published in 1979. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) new definitions and formulation for diameter calculation. b) revised values of constants used for the diame
23、ter calculation. TR 60649 IEC:2007(E) 3 The text of this technical report is based on the following documents: Enquiry draft Report on voting 46C/765/DTR 46C/799A/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
24、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 unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the s
25、pecific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 4 TR 60649 IEC:2007(E) CALCULATION OF MAXIMUM EXTERNAL DIAMETER OF CABLES FOR INDOOR INSTALLATIONS 1 Sc
26、ope This Technical Report gives guidance for calculation of the overall cable diameter according to the structure and the dimensions of the cable elements. 2 Terms and definitions For the purposes of this document, the following terms apply. 2.1 General definitions 2.1.1 single conductor solid condu
27、ctor 2.1.2 solid conductor within the stranded conductor strand 2.1.3 stranded conductor group of assembled strands 2.1.4 cable element conductor, pair, triple, quad, quintuple or other structure. It may be screened or unscreened 2.1.5 solid conductor shape circular 2.1.6 all dimensional values are
28、nominal 2.2 Notation 2.2.1 diameter of solid conductor, d 2.2.2 diameter of concentric-lay stranded conductor, d s2.2.3 diameter of non-concentric-lay stranded conductor, d ns2.2.4 total number of strands in a stranded conductor, N s2.2.5 number of lays in a concentric-lay stranded conductor, n TR 6
29、0649 IEC:2007(E) 5 2.2.6 diameter coefficient for non-concentric-lay stranded conductor, k ns2.2.7 nominal insulation thickness, d i2.2.8 tape thickness, d t2.2.9 braid wire diameter, d b2.2.10 assembly coefficient, K a2.2.11 cable element diameter, d a2.2.12 core diameter, d core2.2.13 sheath thick
30、ness, d sh3 Equations and method for calculations 3.1 Diameter of stranded concentric-lay conductor Stranded concentric-lay is made up of 7, 19, 37, 61, 91 or 127 strands. Each strand has diameter d. The strands are arranged in layers. For this case N scan be calculated from equation (1). N s = 3n 2
31、+ 3n + 1 (1) And d sfrom equation (2) d s = (1+2n)d (2) 3.2 The diameter of stranded non concentric-lay conductor can be calculated by equation (3) and Table 1, as follows: d ns = k ns d (3) 6 TR 60649 IEC:2007(E) Table 1 k nsvalues N sk nsN sk ns 2 2 26 6,0 3 2,15 27 6,15 4 2,41 28 6,41 5 2,7 29 6,
32、41 6 3 30 6,41 7 3 31 6,7 8 3,31 32 6,7 9 3,62 33 6,7 10 4 34 7,0 11 4 35 7,0 12 4,15 36 7,0 13 4,41 37 7,0 14 4,41 38 7,31 15 4,7 39 7,31 16 4,7 40 7,31 17 5,0 41 7,62 18 5,0 42 7,62 19 5,0 43 7,62 20 5,31 44 8,0 21 5,31 45 8,0 22 5,62 46 8,0 23 5,62 47 8,0 24 6,0 48 8,15 25 6,0 49 8,15 3.3 The ove
33、rall diameter of insulated solid conductor, D, can be calculated by equation (4). D = d + 2d i(4) 3.4 Diameter of insulated concentric lay stranded conductor D scan be calculated by equation (5). D s= d s+ 2d i(5) 3.5 Diameter of insulated non-concentric-lay stranded conductor D nscan be calculated
34、by equation (6). D ns= d ns+ 2d i(6) 3.6 Diameter D tover tape wrapped with an overlap on a core can be calculated by equation (7). D t= d core+ 3d t(7) TR 60649 IEC:2007(E) 7 3.7 Diameter D tover tape wrapped without an overlap on a core can be calculated by equation (8). D t= d core+ 2d t(8) 3.8 D
35、iameter D bover braid screen on a core can be calculated by equation (9). D b= d core+ 4,75 d b(9) 3.9 Overall diameter D Aof cable elements assembly can be calculated by equation (10) and Table 2. D A= K a d a(10) Table 2 Assembly coefficient (K a ) Number of cabling elements N Single conductors Pa
36、irs Triples Quads Quintuples 1 2 3 4 5 6 7 8 9 10 10 1,0 2,0 2,15 2,41 2,7 3,0 3,0 3,4 3,6 4,0 1,20 N 2,0 3,4 3,65 4,1 4,6 5,1 5,1 5,5 6,0 6,4 1,95 N 2,15 Note 1 4,1 4,6 5,2 6,0 6,0 6,5 7,0 7,5 2,25 N 2,41 Note 1 4,9 5,5 6,2 6,9 6,9 7,6 8,3 8,8 2,70 N 2,7 Note 1 5,6 6,3 7,0 7,8 7,8 8,7 9,4 10,0 3,10
37、 N NOTE 1 Since these types are rarely manufactured, no coefficient is given. NOTE 2 It is assumed that elements are identical. 3.10 Overall sheath diameter D ccan be calculated by equation (11) D c= D A+ 2d sh(11) NOTE The minimum value for the sheath thickness, d sh , is given in the relevant IEC publications concerning indoor installations. _ INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varemb P.O. Box 131 CH-1211 Geneva 20 Switzerland Tel: + 41 22 919 02 11 Fax: + 41 22 919 03 00 infoiec.ch www.iec.ch
