Requirements for phased evacuation buildings

In such a building, or part of a building – (a) every escape stairway should be approached through a protected lobby or protected corridor at each storey, other than at a top storey consisting exclusively of plant rooms; (b) a protected lobby at each storey should be provided to the approach to every lift that is not within the enclosure of a protected stairway other than at a top storey consisting exclusively of plant rooms; (c) every floor should be a compartment floor; (d) an automatic sprinkler system complying with the relevant recommendations of BS 5306-2 or BS EN 12845, should be installed in accordance with Section 8 throughout the building where the building has a storey more than 30 m above ground level; (e) an automatic fire detection and fire alarm system, to BS 5839-1, of at least Category L3 standard, should be installed; (f) a voice alarm system to BS 5839-8 should be installed throughout the building, or part of the building; and (g) an emergency voice communication system to BS 5839-9 should be installed with a master station at fire and rescue access level (see Section 6) and an outstation on every storey.