Arc Fault Detection Devices (AFDDs) are widely debated in electrical installations. This article explains what AFDDs actually detect, why ring and radial circuits affect signal behaviour, and how modern electrical loads influence arc fault detection.

An RCBO is a Residual Current Breaker with Overcurrent protection. In simple terms, it combines the function of an MCB and an RCD in a single device. That means it protects against two things: