The release of Amendment 2 to the 18th Edition Wiring regulations has introduced the requirement to use AFDDs (Arc Fault Detection Devices) for some socket-outlet circuits in certain type of premises.

AFDD Guide front covers
BEAMA has produced a number of guides, fact sheets and FAQs on AFDDs and their uses.

To support the industry in implementing the requirements of Amendment 2 of the 18th Edition, BEAMA has published a Guide to AFDDs, a series of fact sheets and a comprehensive FAQ list.

With the use of AFDDs being a new requirement, installers and specifiers will no doubt have some questions on AFDDs as these devices may be new to some.

An arcing fault is an unintentional arcing condition in a circuit. Arcing creates high intensity heating at the point of the arc resulting in burning particles that can over time ignite surrounding material. Repeated arcing can create carbon paths that are the foundation for continued arcing, generating even higher temperatures. The temperatures of these arcs can exceed 6000 °C.

AFDDs provide important additional protection against fire that other protection devices cannot. A major change in IET Wiring Regulations, BS 7671: 2018+A2:2022, is that the use of AFDDs has become mandatory for some socket-outlet circuits in certain types of premises, and recommended in all other types of premises for the prescribed socket-outlet circuits.

The BEAMA publications on AFDDs intend to inform and enlighten members of the industry on this technology and its functions.