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Residual current devices (RCDs)

Electrical Technology · Grade 11 · about 40 minutes

Explain how an RCD senses earth leakage and protects people from electric shock.

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  • 9 sections of explanation, worked examples and diagrams
  • 1 practice task with hints and worked answers
  • A quiz that marks itself as you go
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Other lessons in this sub-strand

  1. Electrical hazards and the need for protection
  2. The principle of earthing
  3. Types of earthing systems
  4. Earth electrodes, conductors and lightning arresters
  5. Fuses and their operation
  6. Miniature circuit breakers (MCBs)
  7. Residual current devices (RCDs)
  8. Selecting and coordinating protective devices
  9. Installing and connecting protective devices