Chapter 1 Design considerations -- chapter 2 Types of supply system and earthing arrangements -- chapter 3 Earth electrodes -- chapter 4 Protective bonding -- chapter 5 Diversity -- chapter 6 Cable calculation -- chapter 7 Socket outlet circuits -- chapter 8 Safe isolation -- chapter 9 Isolation and switching -- chapter 10 Periodic inspection volt drop -- chapter 11 Installing an electric shower -- chapter 12 Two-way and intermediate switching -- chapter 13 Fault finding in central heating -- chapter 14 Electrical installation fault finding -- chapter 15 Changing an immersion heater -- chapter 16 RCD tripping faults -- chapter 17 Electric motors -- chapter 18 Use of RCDs -- chapter 19 Calculating the maximum Zs -- chapter 20 Fire protection.