Coordinating Fire Alarm and Emergency Lighting
Getting people out of a building safely takes two things at once: a warning that tells them to leave, and enough light to find the way if the normal lighting has failed. The fire alarm provides the first; emergency lighting provides the second. They are separate systems under separate standards, but they serve the same escape, and a building needs both. Understanding how they relate — and where the fire alarm engineer's part ends — makes for cleaner, safer work. This guide covers the relationship and what to check.
The central point is that the fire alarm and emergency lighting are separate systems with a shared purpose — safe escape — that should be coordinated while each is maintained to its own standard.
Who this is for
This is for competent fire alarm engineers who work alongside emergency lighting. The experience level assumed is competent engineer. Use it for the principles; the fire alarm follows BS 5839-1 and emergency lighting follows BS 5266, each designed and maintained to its own standard, coordinated within the building's fire strategy. The fire alarm engineer maintains the fire alarm and understands, rather than owns, the emergency lighting.
Two systems, one goal
The fire alarm and emergency lighting are separate systems with a shared goal — safe escape. The fire alarm detects and warns; emergency lighting illuminates escape routes if normal lighting fails. They are not the same system and are covered by different standards, but they work together in a building's overall fire safety. The fire alarm follows BS 5839-1 and emergency lighting follows BS 5266, and while distinct, they should be coordinated so escape is supported by both warning and lighting. Seeing them as two halves of the same escape provision — alert and illuminate — is the right mental model, even though they are engineered separately.
Independent but complementary
In how they operate, the two are largely independent. Emergency lighting typically operates on loss of normal lighting rather than on a fire signal, so it does not generally depend on the fire alarm to function; the two can be, and often are, independent. In some designs there may be coordination, but emergency lighting does not rely on the fire alarm to do its job. So they are complementary rather than one driving the other. How each is arranged follows its own standard — BS 5839-1 for the fire alarm and BS 5266 for emergency lighting — coordinated within the building's fire strategy. Understanding this independence prevents the mistake of assuming the fire alarm somehow triggers or covers the lighting.
Why coordination matters
Coordination matters because escape needs both parts, and a gap in either undermines it. Since safe escape depends on being warned and being able to see the way out, a building needs both systems working; neither on its own is enough. Coordinating them means making sure both cover the escape routes consistently and that neither is neglected because attention went to the other. From field experience, it is not unusual for one to be well-maintained while the other has quietly lapsed, leaving an escape route warned but dark, or lit but not covered by detection. The coordination is at the fire strategy level; each system is designed and maintained to its own standard, BS 5839-1 and BS 5266 respectively.
The engineer's part
The fire alarm engineer's role here is bounded but not blind. They maintain the fire alarm, not the emergency lighting, but should understand the relationship and flag obvious concerns — for instance if emergency lighting appears absent or non-functional on an escape route they are working along. Emergency lighting has its own maintenance under BS 5266, carried out by appropriate people, and the engineer should not take it on. But from field experience, an engineer who notices and flags a dark escape route adds real value, because such gaps are easily missed when responsibilities are split. Record fire alarm findings, and flag any evident emergency lighting concern to the responsible person rather than assuming someone else has seen it.
Common points to check
Recurring issues include emergency lighting apparently absent or non-functional on an escape route, one system maintained while the other lapses, and inconsistent coverage between warning and lighting. Confirming the fire alarm's part and flagging obvious lighting concerns is the essential check.
When not to rely on this alone
When not to use this article: do not treat it as guidance for designing or maintaining emergency lighting. That follows BS 5266 and is carried out by appropriate people; the fire alarm follows BS 5839-1.
Relevant standards
The fire alarm follows BS 5839-1 and emergency lighting follows BS 5266-1, both codes of practice, coordinated within the fire strategy. The legal duty for fire precautions and safe escape in most non-domestic premises sits under the Regulatory Reform (Fire Safety) Order 2005. Separate the legal duty from the recommended methods, and always work to current editions.
Professional disclaimer
This is an educational and workflow resource for competent engineers and does not replace the current British Standards, the fire strategy, or competent judgement. Verify each system against its own current standard and documentation.
Related documentation
Use this with the current BS 5839-1 and BS 5266-1 and the fire strategy. Record fire alarm findings, and flag any evident emergency lighting concern to the responsible person.