Standard explained
Manual Call Points Explained
Manual call points (break-glass units) let people raise the alarm by hand. BS 5839 sets where they go — on escape routes and at exits — and how they are tested.
Manual call points (MCPs) — the familiar red "break-glass" units — allow anyone to raise the alarm by hand on discovering a fire. Every fire alarm system, from the simplest Category M upwards, relies on them.
Where they go
BS 5839 sets out where call points must be located so that a person never has far to travel to raise the alarm, including:
- on escape routes, particularly at storey exits and final exits; and
- at a consistent, accessible mounting height.
The aim is that anyone discovering a fire can trigger the alarm quickly as they move toward an exit.
Testing
Manual call points are central to the weekly user test: a different call point is operated each week using a test key, rotating through all of them so every unit and its wiring is proven over time.
Why they matter
Automatic detection is valuable, but a person often spots a fire first. Well-placed, working call points ensure that human awareness is turned into an alarm immediately — which is why they are checked so regularly.
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Learn moreThis article provides general guidance and distinguishes legislation, British Standards and good practice. It is not legal advice. Always confirm the specific duties applying to your property and tenure.