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Practical articles on electrical panel design

Practical instructions, reviews and tips for electricians. Selection of circuit breakers, RCDs, voltage relays, panel mounting.

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A multimeter showing a sagging voltage at the far end of a long copper cable inside a UK consumer unit

Theory22 June 202629 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 drop
cable sizing
twin and earth
mV/A/m

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Zigbee coordinator and sensors for a smart home in a UK flat

Guides22 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 home
zigbee
home assistant

24 min →