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Table 20.13 Earth-fault capacity for separate protective conductors (for initial and final temperatures in BS 7671 Table 54B).
560 Handbook of Electrical Installation Practice Table 20.14 Earth-fault current withstand for steel wire armour on multicore cables to BS 5467. • at the normal operating temperature. Where the protective device is of a different type the resistance of the conductor at a temperature midway between its maximum operating temperature and the maximum permissible final temperature is used in the calculation. Fault current withstand, kA for 1s Copper conductor cable Aluminium conductor cable Cond. 4-core Size reduced (mm 2 ) 2-core 3-core 4-core neutral 5-core 2-core 3-core 4-core 1.5 0.69 0.74 0.78 – 0.87 – – – 2.5 0.78 0.87 0.92 – 1.01 – – – 4 0.87 0.92 1.01 – 1.15 – – – 6 1.01 1.06 1.66 – 1.84 – – – 10 1.20 1.79 1.93 – 2.12 – – – 16 1.93 2.07 2.30 – 3.31 1.79 1.89 2.12 25 1.93 2.85 3.22 3.22 4.05 17.5 2.67 3.04 35 2.76 3.13 3.59 3.50 4.60 2.48 2.94 3.31 50 3.13 3.59 4.14 3.96 6.62 2.76 3.31 3.77 70 3.68 4.14 6.03 5.89 7.64 3.22 3.86 5.61 95 5.20 5.89 6.76 6.62 – 4.60 5.47 6.21 120 5.75 6.49 9.48 7.50 – – 6.03 8.79 150 6.35 9.25 10.58 10.12 – – 8.33 9.71 185 8.79 10.12 11.73 11.50 – – 9.48 10.81 240 9.89 11.50 13.29 12.83 – – 10.58 12.19 300 10.81 12.37 14.67 13.98 – – 11.50 13.29 400 12.19 13.98 20.79 15.78 – – – – These figures assume that the cable is installed so that there is no significant crushing pressure on the insulation such as may arise under fixings or over the edges of objects. For a protective conductor where protection is provided by a device of a type listed in Appendix 3 of BS 7671, the fault current is calculated using its resistance at the normal operating temperature. Where the protective device is of a different type the resistance of the conductor at a temperature midway between its initial temperature and the maximum permissible final temperature is used in the calculation. Further detail on calculation of short-circuit and earth-fault current can be found in the IEE Guidance Note No. 6, Protection against overcurrent, particularly section 4, Determination of fault current.
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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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INTRODUCTION CHAPTER 4 Cable Manage
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CHAPTER 5 Electricity on Constructi
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INTRODUCTION CHAPTER 7 Ground Earth
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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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CHAPTER 19 Mains Cables G.A. Bowie,
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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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