4.4-Electrical safety

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Syllabus Objectives

4.4 Electrical safety

CORE:

  • 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

Revision Notes

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