AFDD stands for Arc Fault Detection Device, and detects the presence of electric arcs in your electrical installation and disconnect the supply before any dangerous effects. From the 27th of September 2022 it will become a requirement to install AFDD’s in the following installations : Higher risk residential buildings; Houses of multiple occupation (HMO); Purpose built student accommodation; Care homes. It also recommends that all socket circuits not exceeding 32a in all other premises are protected by AFDD’s.