Electricity, Energy & Waves
Domestic Electricity - Ring main circuits

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