Shaver Sockets and Bathroom Power: What's Actually Allowed (2026)
A shaver socket is the only socket normally allowed in a UK bathroom, because of the isolating transformer inside it. Zones, the 20VA limit and the 3m exception.
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Access Control Systems: Fail-Safe, Fail-Secure and the Egress Rules You Cannot Design Around (2026)
An access control system controls who opens which door, when. The lock choice is the easy part — getting people back out in a fire is what separates a compliant...
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Dusk to Dawn Lights: Photocell or PIR, and Why People Buy the Wrong One (2026)
A dusk to dawn light works on a photocell: it senses daylight and stays on all night. A PIR light senses movement and stays on for a few minutes. They...
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Patch Panels: Port Count, Cat6 and How to Stop a Cabinet Turning Into Spaghetti (2026)
A patch panel is the fixed termination point for your structured cabling. Get the port count and rack space right and a cabinet stays workable for a decade. Get it...
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Heat Detectors: Rate-of-Rise, Fixed Temperature and Where Smoke Detection Fails (2026)
A heat detector responds to temperature, not smoke — which is why it belongs in kitchens, plant rooms and anywhere steam or fumes are normal. The choice is between rate-of-rise...
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Commercial Fire Alarm Systems: Categories, Zones and the Protocol Trap (2026)
A commercial fire alarm system is designed to BS 5839-1, built from EN54-certified parts and specified by category. Here is how the parts fit together — and the one compatibility...
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Video Intercoms: IP, PoE and Why the Rain Shield Is Not Optional (2026)
A video intercom lets you see and speak to whoever is at the door before you open it. Modern systems are IP and PoE — one cable for power and...
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Comms Cabinets: U Height, Depth and the Measurement Everyone Gets Wrong (2026)
A comms cabinet houses your patch panels, switches and recorders in a standard 19-inch rack. Height in U is the easy decision. Depth is the one that catches people out...
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ANPR Cameras: How They Actually Read a Plate, and Where They Fail (2026)
An ANPR camera reads number plates and turns them into text your system can act on. It is not a normal CCTV camera with clever software bolted on — and...
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