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A multimeter showing a sagging voltage at the far end of a long copper cable inside a UK consumer unit
Theory··29 min read

Voltage Drop in Cables: When 2.5 mm² Is Too Little

Voltage drop explained for UK homes: the mV/A/m method, BS 7671 limits (3% lighting, 5% other), worked examples and how to fix a long run by upsizing the cable.

voltage dropcable sizingtwin and earthmV/A/m
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Zigbee coordinator and sensors for a smart home in a UK flat
📋 Guides·22 June 2026

Smart Home in a Flat: Where to Start in 2026

Build a smart home on Zigbee and Home Assistant for £300-500. Real UK kit, prices, automation scenarios, and how it ties into your consumer unit.

smart homezigbeehome assistant
24 min →