Residual-current devices by Electricians Leeds MPS Electrical Contractors Ltd https://www.mps-electrical.com/
A RCD is a mechanically operated device which in the event of a imbalance disconnects the affected circuit protecting the user from the risk of electric shick.
RCD’S are now mandatory under the 17th edition wiring regulations for a number of reasons in residential dwellings, commercial & industrial environments.
If you have a consumer unit that does not have RCD protection then further modifications to existing circuits & the installation of new circuits may require the introduction of a RCD.
In most cases a replacement consumer unit may be needed or a stand alone RCD device to cover the affected circuit.
See www.MPS-Electrical for more information.