Is One Screw Enough For Electrical Connections?

Loose meter tails are one of the most common causes of overheating and electrical fires in UK consumer units - but is modern terminal design part of the problem? In this video, we put single-screw vs double-screw meter tail terminals to the test and ask a simple question: "is one screw really enough?" We look inside modern DIN-rail main switches and isolators, compare them with older brass terminals, and physically test how secure these connections really are once cables are disturbed. With smart meter rollouts, EV chargers, solar PV, and heat pumps all increasing the amount of work happening in meter boxes, meter tails are being moved, flexed, and extended more than ever. That movement can transfer straight back to the termination - and that’s where things can go wrong. We cover: • Why loose meter tails became a headline fire risk • Single screw vs double screw terminal behaviour • Cage clamp vs traditional brass terminals • Why torque settings actually matter • What happens when connections are overtightened • How strand count affects termination security • What BS7671 says about supporting meter tails • Practical ways to reduce strain on terminations We also explain why supporting meter tails correctly is just as important as the terminal design itself, and how poor cable management can undo even a perfectly torqued connection. If you work on consumer units, isolators, EV chargers, solar PV, or anything involving meter tails, this is one of those details that’s easy to miss - but critical to get right. ========== Links mentioned in this video: Learn More About The Whitecliffe Electrical Solutions 👉 https://hub.efixx.co.uk/Whitecliffe Safe Isolation Provider (SIP) – A Coole Electrical 👉 https://hub.efixx.co.uk/ACooleElectrical Torque screwdriver used (Wiha SlimVario) 👉 http://hub.efixx.co.uk/wiha-torque-set-amz What happens when torque settings aren't used. (Dr Robert Weller video) 👉 https://www.youtube.com/watch?v=RgkhHRJvGTA Free electrical safety & isolation training module 👉 https://training.efixx.co.uk/course/diverted-neutral-current-and-safe-isolation ========== 💬 Join the discussion Have you found loose meter tails on site? Do you trust single-screw terminals? Or is proper support the real fix? Drop your experiences in the comments 👇 ========== Time Stamps ⏱️ 00:00 – Are loose meter tails really a fire risk? 00:42 – Old main switches vs modern terminals 01:48 – Why smart meters changed everything 02:50 – Working around sealed metering equipment 03:30 – One screw vs two screws: the test setup 04:22 – The waggle test results 05:15 – Torque settings vs “squeaky tight” 06:05 – What the Wiring Regulations actually say 06:45 – Supporting meter tails properly 07:10 – Final thoughts and site takeaways ========== #electricians #electricalinstallation #circuitprotection