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BS IEC 60287-2-1:2023 – TC

BS IEC 60287-2-1:2023 – TC

$246.62

Tracked Changes. Electric cables. Calculation of the current rating – Thermal resistance. Calculation of thermal resistance

Published By Publication Date Number of Pages
BSI 2023 120
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PDF Catalog

PDF Pages PDF Title
1 30477033
71 A-30431016
72 undefined
74 CONTENTS
76 FOREWORD
78 INTRODUCTION
79 1 Scope
2 Normative references
80 3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
83 4 Calculation of thermal resistances
4.1 Thermal resistance of the constituent parts of a cable, T1, T2 and T3
4.1.1 General
4.1.2 Thermal resistance between one conductor and sheath T1
87 4.1.3 Thermal resistance of any generic annular layer
4.1.4 Thermal resistance between sheath and armour T2
88 4.1.5 Thermal resistance of outer covering (serving) T3
89 4.1.6 Pipe-type cables
4.2 External thermal resistance T4
4.2.1 Cables laid in free air
91 4.2.2 Single isolated buried cable
4.2.3 Groups of buried cables (not touching)
94 4.2.4 Groups of buried cables (touching) equally loaded
96 4.2.5 Cables in buried troughs
4.2.6 Cables in ducts or pipes
98 4.2.7 Cables or conduits laid in a medium of different thermal resistivity
99 5 Digital calculation of quantities given graphically
5.1 General
5.2 Geometric factor G for two-core belted cables with circular conductors
100 5.3 Geometric factor G for three-core belted cables with circular conductors
101 5.4 Thermal resistance of three-core screened cables with circular conductors compared to that of a corresponding unscreened cable
102 5.5 Thermal resistance of three-core screened cables with sector-shaped conductors compared to that of a corresponding unscreened cable
103 5.6 Curve for for obtaining the thermal resistance of the filling material between the sheaths and armour of SL and SA type cables
104 5.7 Calculation of Δθs by means of a diagram
105 Tables
Table 1 – Thermal resistivities of materials
106 Table 2 – Extended values of the geometric factor for duct banks and backfills
107 Table 3 – Values for constants Z, E and Cg for black surfaces of cables in free air
108 Figures
Figure 1 – Diagram showing a group of q cables and their reflection inthe ground-air surface
Table 4 – Absorption coefficient of solar radiation for cable surfaces
Table 5 – Values of constants U, V and Y
109 Figure 2 – Geometric factor G for two-core belted cables withcircular conductors (see 4.1.2.2.2)
110 Figure 3 – Geometric factor G for three-core belted cables withcircular conductors (see 4.1.2.2.4)
111 Figure 4 – Thermal resistance of three-core screened cables withcircular conductors compared to that of a corresponding unscreened cable (see 4.1.2.3.1)
112 Figure 5 – Thermal resistance of three-core screened cables withsector-shaped conductors compared to that of a corresponding unscreened cable (see 4.1.2.3.3)
113 Figure 6 – Geometric factor for obtaining the thermal resistances ofthe filling material between the sheaths and armour of SLand SA type cables (see 4.1.2.5)
114 Figure 7 – Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 1 to 4
115 Figure 8 – Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 5 to 8
116 Figure 9 – Heat dissipation coefficient for black surfaces of cables in free air, laying conditions 9 and 10
117 Figure 10 – Graph for the calculation of external thermal resistance of cables in air
118 Annex A (informative) Correction factor for increased lengths of individual cores within multicore cables
Table A.1 – Values of CfL for different cases
119 Bibliography

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BS IEC 60287-2-1:2023 - TC
$246.62