What does ‘RCD’ stand for and what is its purpose?

The term 'RCD' stands for Residual Current Device. Its primary purpose is to enhance safety in electrical systems by protecting individuals from electric shock and preventing electrical fires. The RCD monitors the electrical current flowing through a circuit and detects any imbalance that may occur. This imbalance can happen when there is a leakage of current, for example, when someone comes into contact with a live wire.

In such cases, the RCD can quickly disconnect the supply of electricity, reducing the risk of serious injury or fatality from electric shock. Additionally, a current imbalance could lead to overheating and potential fires, and by disconnecting the circuit promptly, the RCD serves as a critical safety mechanism in homes and commercial electrical installations. This proactive approach to detecting fault conditions makes RCDs an essential component in modern electrical safety systems.

Other options do not accurately describe the function of an RCD. While they touch on various types of devices, none align with the safety-preserving role of the RCD in preventing electric hazards.