I’ve always been a fan of the underdog—the Spock to Captain Kirk or the Samwise to Frodo. Emergency lighting is the silent hero in building safety: always there but often overlooked until needed.
When the power goes out, these luminaires kick in, providing essential illumination. But just as I wonder why Spock has pointy ears, you might ask why UK law requires batteries in emergency luminaires to last at least three hours.
Let’s start with the regs. The three-hour minimum aligns with UK fire safety standards governing emergency lighting, such as BS 5266- 1. This ensures that even in large or complex buildings, all occupants can evacuate safely. In high-rise structures or facilities with vulnerable individuals—such as hospitals or care homes— evacuations take longer, and three hours provide a necessary buffer.
But it’s not just about getting people out. Emergency lighting supports Emergency Services, providing reliable illumination to navigate, rescue, and manage emergencies effectively. Whether extinguishing fires or aiding trapped individuals, the three-hour minimum ensures they can operate without the hazard of complete darkness. Not to mention, power outages may extend beyond evacuations. Occupants may need to shelter in place, requiring continued lighting for reassurance and visibility.
So, why not make batteries last longer? While possible, it would increase battery size, maintenance demands, and expense—without significant added safety benefits for typica al scenarios. The three-hour rule reflects a careful balance of practicality, safety, and cost. I like to think that’s the kind of logical thinking Spock would get behind.
John Ford | Technical Training Manager
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