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.

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The Navitas N633P is a 63 amp triple pole rotary isolator designed for modern consumer units. It provides a clean, lockable, and fully compliant way to isolate circuits for solar PV, EV chargers, heat pumps, and other high demand installations. Unlike RCBOs, it offers true mechanical disconnection, fits directly on the DIN rail, and meets all key requirements in BS 7671. Trusted by electricians across the UK, it is the smart choice for safer