Fire Detection in Lift Shafts and Lift Motor Rooms
Lifts sit at an awkward intersection of fire safety: the shaft is a vertical route that can move smoke between floors, the motor room holds electrical fire load, and the lift itself must not carry people into danger or trap them during a fire. Detection in these areas does double duty — early warning, and triggering the lift to behave safely. This guide covers why lift areas need detection, how it links to lift recall, and what to check.
The defining point is that lift-related detection is not just about warning; it is about making the lifts do the right thing in a fire.
Who this is for
This is for competent fire alarm engineers dealing with detection in lift shafts and motor rooms and its interface to the lifts. The experience level assumed is competent engineer. Use it for the principles; the specific detection and recall arrangements come from the fire risk assessment, the lift and building design, BS 5839-1 and the lift standards.
Why lift areas need detection
Lift shafts are vertical routes that can carry smoke between floors, and motor rooms contain electrical equipment and fire load, so both warrant attention. Detection there provides early warning and, importantly, can trigger lift recall so lifts do not carry people into a fire or become stranded. Where and how detection is provided in these areas follows the fire risk assessment, the lift interface design and BS 5839-1, coordinated with the lift standards. The lift installation and the fire alarm have to be considered together rather than in isolation.
Detection and lift recall
Detection associated with the lift installation is commonly used, through a defined interface, to recall lifts to a safe floor and take them out of normal service on a fire. So the detection is part of making the lifts behave safely, not only a warning function. Which detection recalls which lifts, and how, is set by the cause and effect and the lift interface design, following BS 5839-1, BS 7273-4 where actuation applies, and the lift standards. This is a coordinated arrangement between the fire alarm and the lift, and it must be designed and proven as such.
Detector selection
Detector selection in these areas depends on the conditions. Motor rooms can be warm and may suit heat detection; shaft-top detection is often provided as part of the arrangement. From field experience, the practical catches are motor rooms warm enough to trouble smoke detection and shaft detection that is awkward to access for testing. The specifics come from the fire risk assessment, the lift and building design, the manufacturer's guidance and BS 5839-1, coordinated with the lift installation, rather than from one fixed rule.
Servicing lift-related detection
Servicing lift-related detection means proving both the detection and the recall, which needs coordination. Confirm the detection is present and suitable, that it correctly triggers lift recall per the cause and effect, and that access and coordination with the lift maintainer allow proper testing. From field experience, recall that has never actually been proven, and detection not coordinated with lift maintenance, are the recurring problems. Re-test after any change and record the results, working with whoever maintains the lifts.
Common points to check
Recurring issues include lift recall not proven against the cause and effect, motor-room detection unsuited to the warmth, and shaft detection that cannot be readily tested. Confirming detection triggers safe lift behaviour is the essential check.
When not to rely on this alone
When not to use this article: do not use it to design lift-area detection or recall for a specific building. Those come from the fire risk assessment, the lift and building design, BS 5839-1, BS 7273-4 and the lift standards, applied by competent professionals.
Relevant standards
Lift-area detection and recall are addressed within BS 5839-1, a code of practice, and BS 7273-4 for actuation, coordinated with the lift standards. 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 lift documentation, the fire strategy, or competent judgement. Verify lift-area detection and recall against current documentation.
Related documentation
Use this with the current BS 5839-1 and BS 7273-4, the lift and building design, and the system cause and effect. Record lift-area detection and recall behaviour, and re-prove it after any change, coordinating with the lift maintainer.