Electrical safety

Core

• 4.4.1 State the hazards of: (a) damaged insulation (b) overheating cables (c) damp conditions (d) excess current from overloading of plugs, extension leads, single and multiple sockets when using a mains supply
• 4.4.2 Know that a mains circuit consists of a live wire (line wire), a neutral wire and an earth wire and explain why a switch must be connected to the live wire for the circuit to be switched off safely
• 4.4.3 Explain the use and operation of trip switches and fuses and choose appropriate fuse ratings and trip switch settings
• 4.4.4 Explain why the outer casing of an electrical appliance must be either non-conducting (double-insulated) or earthed
• 4.4.5 State that a fuse without an earth wire protects the circuit and the cabling for a double- insulated appliance