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  RCDs Explained What is a residual current device (RCD)? It’s a safety device that automatically switches off the electricity if there is a fault. It’s far more sensitive than normal fuses and circuit breakers. It can be a lifesaver, reacting quickly to prevent electricity causing a fatal shock.   An RCD constantly monitors the electric current flowing along a circuit.   If it detects electricity flowing down an unintended path, such as through a person who has touched a live part, it will switch the circuit off instantly, reducing the risk of death or serious injury.  RCDs can help protect you from electric shock in potentially dangerous areas such as bathrooms and gardens. Using electricity when you maybe wet significantly increases the risk of electric shock. If you are wet and make contact with the ground, it’s easy for electricity to flow through you.   So it’s very important to have RCD protection when using electrical equipment in these areas. If you don’t, a job like