RCD Testing

A Residual Current Device (RCD) is a life-saving device that instantly cuts power when it detects an electrical fault. It monitors the current flowing in and out of a circuit and trips within milliseconds if it detects an imbalance, preventing fatal electric shocks.

You should test RCDs monthly by pressing the test button. Professional testing should be conducted every 6 months or as part of your periodic electrical inspection (EICR). Regular testing ensures the RCD will operate correctly in an emergency.

An MCB (Miniature Circuit Breaker) protects against overload and short circuits. An RCD protects against earth faults and electric shocks. RCBOs combine both functions in one device, providing comprehensive protection for individual circuits.

Frequent RCD tripping indicates an electrical fault such as damaged cables, faulty appliances, moisture ingress, or deteriorating insulation. It's a warning sign that shouldn't be ignored. Professional fault-finding identifies and resolves the underlying problem.

Current regulations require RCD protection for most circuits, especially sockets, outdoor circuits, and bathrooms. Older properties may not have full RCD protection. Upgrading to a modern consumer unit with RCBOs provides the best protection.

A faulty RCD won't protect you from electric shocks, creating a serious safety risk. Regular testing identifies failed RCDs before they're needed in an emergency. If your RCD fails testing, it must be replaced immediately by a qualified electrician.