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Electricity, Energy & Waves
Domestic Electricity - Ring main circuits
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There are two electrical supply cables. The live carries the AC current and changes from positive to negative 50 times per second.
For safety an earth wire is used for your house. It's not directly connected to the earth.
Miniature circuit breakers (MCB) are used in place of a fuse because they act faster than fuses.
Residual current circuit breakers (RCCB) will help protect against shock. They measure the currents in the live wire and neutral. If everything is working properly the two values are equal. But if you accidentally touch the live wire some current flows through your body to the ground. Now the current in the neutral and live will be different. The device will detect the difference in currents and throw the switch breaking the circuit.