A Residual Current Device (RCD) constantly monitors the electric current flowing through one or more circuits it is used to protect
Answered by Dave, Electrical Safety Expert
A Residual Current Device (RCD) constantly monitors the electric current flowing through one or more circuits it is used to protect. If it detects electricity flowing down an unintended path, such as through a person who has touched a live part, the RCD will switch the circuit off very quickly, significantly reducing the risk of death or serious injury.
To add RCD protection in your home, it is most likely that you will need to replace the fusebox - although there are alternative options, including replacing sockets with ones that have RCDs built in or installating a Residual Current Circuit Breaker with Over-Current (RCBO) into the fusebox.
A replacement fusebox will cost around £500. You should consult a registered electrician who will be able to advise you on the best option for your home. You can find one in your area here.