BS 5839
Practical guides on fire alarms, extinguishers, emergency lighting and UK fire safety rules, written for installers, contractors and building managers.
Fire Alarms
BS 5839-1 Fire Alarm Categories Explained: L1–L5, M, P1 & P2
BS 5839-1 defines eight fire alarm categories: M, L1–L5, P1 and P2. Learn what each covers, what changed in the 2025 edition, and who should decide which category your building needs.
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