Surge Protection Devices (SPDs) Explained: What They Are and What BS 7671 Amendment 2 Requires
Voltage surges from lightning and switching events can destroy electronics silently and instantly. This guide explains how Surge Protection Devices work, the main SPD types, where BS 7671 Amendment 2 requires them, and how to choose the right SPD for a domestic or commercial installation.
AFDDs Explained: Arc Fault Detection Devices and BS 7671 Requirements
Arc Fault Detection Devices (AFDDs) are required by BS 7671 in specific higher-risk residential locations and recommended more widely. This guide explains what AFDDs are, how they detect dangerous arcing faults that MCBs and RCDs miss, where they are required, and whether you need one.
RCD Protection Zones Explained: How to Design a Modern Consumer Unit
Split-load, fully RCBO, whole-board RCD — which layout gives the best protection without constant nuisance trips? This guide explains how RCD protection zones work, how to plan circuit allocation, and what BS 7671 actually requires for new and upgraded consumer units.