Safety

• MCB (miniature circuit breaker)

  • Works using electromagnets
  • More efficient than fuse
  • Reusable
• RCCD (residual current circuit device)

  • Expensive
  • More accurate
  • Balance of power going in (live wire) & power going out (neutral)
• Calculating fuse need

  V x I
• Mains voltage value (this country) = 230v