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Also, for the benifit of anyone who doesn't know the difference, a circuit breaker and an RCD are two completely different things (though you often get a "combined" device).
A circuit breaker is there to protect the wiring in the house from melting and burning your house down. It offers no personal protection for an unfortunate person who touches a live wire. A circuit breaker has a specific current rating (16A for a general household power circuit), and if more current is drawn through it than that (either from overloading or from a short) it will trip.
An RCD (residual current device), often called a saftey switch or earth leakage detector, is designed to protect people. It basically compares the current flowing in vs the current returned and a difference (leakage to earth) causes the RCD to trip. This helps prevent you from being zapped as (generally) you will complete the circuit to earth and cause the leakage. The RCD then trips in a few milliseconds, preventing your death. As staed by zxhoon - it is still possible to complete an active-neutral circuit and not be protected.
The important thing here though, is most old houses do not have RCDs (they are legally required in new houses), and will only have fuses or circuit breakers, and alot of people don't know the difference and assume that a breaker or fuse will protect them.
You should also be testing your RCDs every few months (by pressing the little test button on it - which should trip the unit if it is working correctly)
A circuit breaker is there to protect the wiring in the house from melting and burning your house down. It offers no personal protection for an unfortunate person who touches a live wire. A circuit breaker has a specific current rating (16A for a general household power circuit), and if more current is drawn through it than that (either from overloading or from a short) it will trip.
An RCD (residual current device), often called a saftey switch or earth leakage detector, is designed to protect people. It basically compares the current flowing in vs the current returned and a difference (leakage to earth) causes the RCD to trip. This helps prevent you from being zapped as (generally) you will complete the circuit to earth and cause the leakage. The RCD then trips in a few milliseconds, preventing your death. As staed by zxhoon - it is still possible to complete an active-neutral circuit and not be protected.
The important thing here though, is most old houses do not have RCDs (they are legally required in new houses), and will only have fuses or circuit breakers, and alot of people don't know the difference and assume that a breaker or fuse will protect them.
You should also be testing your RCDs every few months (by pressing the little test button on it - which should trip the unit if it is working correctly)