BS 5588-5:2004
7.2.6 Dual-entry fire-fighting lifts Where it is impractical to locate all adjacent lifts within the fire-fighting shaft, a dual-entry fire-fighting lift may be provided with a separate fire-fighting lobby accessible through a second set of lift doors (see Figure 11). However, because of the additional risks that this arrangement places on the safety of the fire-fighting shaft, a number of additional precautions need to be taken: a) certain additional facilities need to be provided by the lift control system (see BS EN 81-72:2003, 5.8.9); b) the number of dual-entry fire-fighting lifts serving any storey should not exceed half the total number of lifts for that storey; c) the fire resistance of the lift landing door to the main lift lobby should be increased to 60 min; d) any storey served by a single fire-fighting lift should not be served by a dual-entry fire-fighting lift. Where a fire-fighting lift is dual-entry, the lift landing doors to the main lift lobbies should be separated from the accommodation by an enclosure with a fire resistance of not less than 30 min (see Figure 11). The doors to this enclosure should be self-closing, but not by means of rising butts. Means of overriding the self-closing device may be provided by a hold-open system incorporating an automatic release mechanism conforming to BS 5839-3 or BS EN 1155. The automatic release mechanism should release the door to close automatically in the event of: 1) the detection of smoke by suitable automatic apparatus mounted at high level in the accommodation adjacent to a door to the main lift lobby enclosure; 2) failure of a power supply; 3) operation of a fire-fighting lift switch; 4) operation of a fire alarm system; 5) manual operation at a central control point; 6) actuation of an automatic fire extinguishing system (e.g. a sprinkler system); 7) the removal, for whatever reason, of a smoke detector in a fire detection zone protecting accommodation directly accessible from the fire-fighting shaft. Such doors should be suitably marked on both sides, at approximately eye level, with the appropriate sign conforming to BS 5499-1.
Š BSI 26 November 2004
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