Electrical Installation by Abb

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Electrical installation handbook Volume 2
3rd edition

Electrical devices

1SDC010001D0203

ABB SACE

Electrical installation handbook

Volume 2

Electrical devices

3nd edition June 2005

Index
Introduction ............................................................................................................... 2 1 Standards 1.1 General aspects ............................................................................................. 3 1.2 IEC Standards for electrical installation ......................................................... 15 2 Protection of feeders 2.1 Introduction .................................................................................................. 22 2.2 Installation and dimensioning of cables ......................................................... 25 2.2.1 Current carrying capacity and methods of installation ........................ 25 Installation not buried in the ground ................................................... 31 Installation in ground .......................................................................... 44 2.2.2 Voltage drop ........................................................................................ 56 2.2.3 Joule-effect losses .............................................................................. 66 2.3 Protection against overload .......................................................................... 67 2.4 Protection against short-circuit ..................................................................... 70 2.5 Neutral and protective conductors ............................................................... 78 2.6 Busbar trunking systems .............................................................................. 86 3 Protection of electrical equipment 3.1 Protection and switching of lighting circuits ................................................ 101 3.2 Protection and switching of generators ...................................................... 110 3.3 Protection and switching of motors ............................................................ 115 3.4 Protection and switching of transformers ................................................... 135 4 Power factor correction 4.1 General aspects ......................................................................................... 150 4.2 Power factor correction method ................................................................. 156 4.3 Circuit-breakers for the protection and switching of capacitor banks .......... 163 5 Protection of human beings 5.1 General aspects: effects of current on human beings ................................. 166 5.2 Distribution systems ................................................................................... 169 5.3 Protection against both direct and indirect contact ..................................... 172 5.4 TT system .................................................................................................. 175 5.5 TN system .................................................................................................. 178 5.6 IT system ................................................................................................... 181 5.7 Residual current devices ............................................................................ 183 5.8 Maximum protected length for the protection of human beings .................. 186 6 Calculation of short-circuit current 6.1 General aspects ......................................................................................... 204 6.2 Fault typologies .......................................................................................... 204 6.3 Determination of the short-circuit current: “short-circuit power method” .......................................................................................... 206 6.3.1 Calculation of the short-circuit current ............................................. 206 6.3.2 Calculation of the...
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