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BS IEC 60287-1-1:2023

BS IEC 60287-1-1:2023

$167.15

Electric cables. Calculation of the current rating – Current rating equations (100 % load factor) and calculation of losses. General

Published By Publication Date Number of Pages
BSI 2023 44
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 Blank Page
5 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
11 3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
15 4 Permissible current rating of cables
4.1 General
4.2 Buried cables where drying out of the soil does not occur or cables in air
4.2.1 AC cables
16 4.2.2 DC cables up to 5 kV
4.3 Buried cables where partial drying-out of the soil occurs
4.3.1 AC cables
17 4.3.2 DC cables up to 5 kV
4.4 Buried cables where drying-out of the soil shall be avoided
4.4.1 AC cables
18 4.4.2 DC cables up to 5 kV
4.5 Cables directly exposed to solar radiation
4.5.1 General
4.5.2 AC cables
19 5 Calculation of losses
5.1 AC resistance of conductor
5.1.1 General
5.1.2 DC resistance of conductor
5.1.3 Skin effect factor ys
20 5.1.4 Proximity effect factor yp for two-core cables and for two single-core cables
5.1.5 Proximity effect factor yp for three-core cables and for three single-core cables
21 5.1.6 Skin and proximity effects in pipe-type cables
5.2 Dielectric losses (applicable to AC cables only)
22 5.3 Loss factor for sheath and screen (applicable to power frequency AC cables only)
5.3.1 General
23 5.3.2 Two single-core cables, and three single-core cables (in trefoil formation), sheaths bonded at both ends of an electrical section
24 5.3.3 Three single-core cables in flat formation, with regular transposition, sheaths bonded at both ends of an electrical section
5.3.4 Three single-core cables in flat formation, without transposition, sheaths bonded at both ends of an electrical section
25 5.3.5 Variation of spacing of single-core cables between sheath bonding points
26 5.3.6 Effect of Milliken conductors
5.3.7 Single-core cables, with sheaths bonded at a single point or cross-bonded
29 5.3.8 Two-core unarmoured cables with common sheath
5.3.9 Three-core unarmoured cables with common sheath
30 5.3.10 Two-core and three-core cables with steel tape armour
31 5.3.11 Cables with each core in a separate metallic sheath (SL type) and armoured
5.3.12 Losses in screen and sheaths of pipe-type cables
32 5.4 Loss factor for armour, reinforcement and steel pipes (applicable to power frequency AC cables only)
5.4.1 General
5.4.2 Non-magnetic armour or reinforcement
33 5.4.3 Magnetic armour or reinforcement
37 5.4.4 Losses in steel pipes
38 Table 1 ā€“ Electrical resistivities and temperature coefficientsof metals used
39 Table 2 ā€“ Skin and proximity effects ā€“Experimental values for the coefficients ks and kp
40 Table 3 ā€“ Values of relative permittivity and loss factors for the insulation of high-voltage and medium-voltage cables at power frequency
Table 4 ā€“ Absorption coefficient of solar radiationfor cable surfaces
41 Annex A (normative) Correction factor for increased lengths of individual cores within multicore cables
Table A.1 ā€“ Values of factor CfL for different numbers of cores
42 Bibliography

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BS IEC 60287-1-1:2023
$167.15