Page 9 - food store model (with basement accomodation)

Reference Guide Fire Strategy

1.5.5 Stair Width

Stairs designated for escape should be suitably sized for the number of occupants expected

to use them. This width can be determined by estimating the population of the area the stair
serves and the information contained in the table below.

Maximum number of persons served by a stair of width:
1,000mm 1,100mm 1,200mm 1,300mm 1,400mm 1,500mm 1,600mm 1,700mm 1,800mm
No. of
occupants 150 220 240 260 280 300 320 340 360
served

It is noted that handrails and strings which do not protrude more than 100mm into the width
of stairs may be disregarded when measuring clear stair width.

1.5.6 Exit Signage

All escape routes should be distinctively and conspicuously marked by an exit sign in

accordance with BS ISO 3864-1 and BS5499-4.

1.5.7 Emergency Escape Lighting

Emergency Escape Lighting should be provided to enable the safe movement of persons
along all internal and external escape routes. Emergency lighting should be provided in
accordance with BS 5266-1 and BS EN 1838.

1.5.8 Door Swing

The door leaf of any doorway or exit should, where reasonably practicable, be hung to swing

in the direction of escape and should always do so if the expected occupancy is more than
60 persons.

1.5.9 Security Locking Mechanisms

Where a door required for means of escape is provided with an electromechanical or

electromagnetic type security device, the device should be appropriately interfaced with the
storewide fire alarm and detection system. The door should fail safe open unlocked in the

following circumstances:

• On operation of the fire alarm system,

• Loss of power or system error, or

• On operation of a manual door release mechanism compliant with BS EN 54-11.

Document Classification Final Document Ref: 3.1-RCS-RHSE-(110)-263 Version 1.1
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