UK Plumbing & Electrical News

Arc fault detection devices (AFDDs) are now mandatory in HMOs and high-risk premises under BS 7671:2018 Amendment 2. This guide covers how AFDDs work, where Regulation 421.1.7 applies, wiring and commissioning, nuisance tripping, and coordination with RCBOs and SPDs.

Amendment 2 to the 18th Edition Wiring Regulations (BS 7671:2022) made surge protection devices (SPDs) and arc fault detection devices (AFDDs) expected — and in some cases mandatory — on new installations. This trade guide covers what each device does, when it is required, and what to specify for consumer unit work in domestic properties.