Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

(d) Underplatform services ducts shall be provided with at
least two means of escape with exits or exit accesses
located near the two ends of the underplatform services
ducts. Travel distances in Cl.2.2.4.4 and Cl.2.2.4.7 are
not applicable to underplatform services ducts, except
that one way travel to exit or exit access shall not
exceed 15m. It is acceptable that exit accesses are
provided in the fire-rated wall that separates the
underplatform services ducts into two sections as
required by Note 8 of Table 2.5A.
(e) Non-illuminated exit and directional signs (e.g. sticker
type) where used in cable chambers and underplatform
service ducts shall comply with SS 508. Nonilluminated
exit signs shall be fixed on the exit and/or
exit access doors.
2.2.4.6 The capacity of exits, exit staircases, exit passageways,
corridors, exit doors and other exit facilities shall be
measured in units of width of one half of a metre. The
number of persons per unit of width shall be as follows:
Type of
Means of escape
Capacity (1)
No. of person per unit of
width (2)
Exit & corridor doors (3) 80
Staircases 60
Ramps, corridors & exit
passageways
Capacity
Standard for Fire Safety in Rapid Transit Systems 23
100
(1) Where a room or space is required to be provided with
two exits, each exit shall be of sufficient width to
accommodate not less than one half the total occupant
load.
(2) In the determination of each exit width, fractions of a
unit width less than 250mm shall not be credited.
Where 250mm or more are added to one or more full
units, half of a unit of width shall be credited. Exit
width shall be the clear width of the means of escape.
(3) Measurement of door width shall be in accordance
with Cl.2.2.5.13(c).