Handbook of Electrical Installation Practice - BeKnowledge

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Table 20.6 Cable data for singlecore unsheathed PVC cable in conduit or trunking. † Note: All values apply to one singlecore PVC cable to BS 6004, at 70°C. rectangular outline of the cables is the outline of the heat-dissipating surface of the group. Under these circumstances it is convenient to assume that each cable occupies a square area with sides equal to the diameter of the cable. The total cross-sectional area of the group is then equal to the sum of these squares. The depth, calculated by dividing this area by the width, approximates to the visual depth.The unit system, used to calculate the area occupied by each circuit, differs therefore from that used for cables in conduit and trunking by being based on the square of the cable diameter and not on p/4 times that value. Example 3 Group of SWA cables on a perforated steel tray Ambient temperature 25°C, C a = 1. (Note: The reference ambient temperature for cables on trays is 25°C, this being a more usual temperature for industrial installations. For any other ambient temperature: C a = Ê 70 - Ambˆ Ë 45 ¯ Selection of Wiring Systems 549 Table 20.7 Trunking and conduit data for groups of cables.
550 Handbook of Electrical Installation Practice Fig. 20.3 Cable size selection for cables on trays (single and multi-core cables to BS 6346). where Amb = ambient temperature, °C.) Voltage-drop limit = 6000mV single-phase. For cable data see Table 20.8. The circuit schedule is given in Table 20.9. A tray width of 450mm has been chosen. Depth of group is then 25916/450 = 57.6mm.
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HANDBOOK OF ELECTRICAL INSTALLATION
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© 2003 by Blackwell Science Ltd, a
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vi Contents System operation 79 Ide
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viii Contents Training and systems
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x Contents 18 Lighting 475 h.r. kin
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Preface My first task as editor is
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2 Handbook of Electrical Installati
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10 Handbook of Electrical Installat
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INTRODUCTION CHAPTER 4 Cable Manage
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CHAPTER 5 Electricity on Constructi
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100 Handbook of Electrical Installa
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CHAPTER 6 Standby Power Supplies D.
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INTRODUCTION CHAPTER 7 Ground Earth
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INTRODUCTION CHAPTER 8 Cathodic Pro
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CHAPTER 10 Special Installations or
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CHAPTER 12 Standards, Specification
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CHAPTER 13 Distribution Transformer
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DEFINITIONS CHAPTER 14 Switchgear A
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Table 14.1 (contd) 374 Handbook of
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CHAPTER 15 Rotating Machines D.B. M
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APPENDIX I Main Authoritative Docum
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670 Index oil, 364, 366 oil filling
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672 Index earthing, 234 earth termi
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674 Index swimming pools, 252 switc
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