The 5 times RCD test was never part of BS 7671 — yet it became one of the most repeated habits in our industry. This article explains where the test really came from, why it caused so much confusion, and how electricians should verify RCD and RCBO performance correctly under the latest wiring regulations.

Residual Current Devices (RCDs) are essential for compliance and safety under BS 7671, but not all types are the same. Many existing installs still rely on legacy Type AC devices that cannot detect the leakage currents created by modern appliances. Type A is now the baseline, but even that does not cover every scenario. In this guide we explain the differences between Type AC, A, F and B RCDs, when each should be used, and what electricians need to watch out for on site.

Split load boards are on the way out. If you're still fitting them, this video could change everything. In this video, we break down the exact reasons why BS 7671 is pushing the industry towards RCBO-only protection