-- Core –

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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.

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.

Explain the use and operation of trip switches and fuses and choose appropriate fuse ratings and trip switch settings.

Explain why the outer casing of an electrical appliance must be either non-conducting (double-insulated) or earthed.

State that a fuse without an earth wire protects the circuit and the cabling for a double-insulated appliance.