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

(h) All sides shall be properly sealed, and
(i) The concealed space shall be sub-divided by cavity
barriers such that the maximum unobstructed area
within the concealed space do not exceed 930m 2 , and
(j) Where the concealed space is fitted with an automatic
sprinkler system which complies with the requirements
in Section 2.5, cavity barriers are not required, and
(k) The height of concealed space measured between the
top of the structural floor and underside of the raised
floor decking shall not exceed 400 mm and shall be
fitted with automatic detection system complying with
requirements of SS CP 10 Code of Practice for the
Installation and Servicing of Electrical Fire Alarm
Systems; and in the case of sprinkler protected
compartment, the height of concealed space may
exceed 400 mm if the space is fitted throughout with
an automatic sprinkler system which complies with the
requirements in Section 2.5.
2.3.11.8 The concealed spaces of suspended ceiling over an exit
passageway, smoke-stop lobby, exit staircase or other
designated means of escape facilities, shall comply with the
following:
(a) The ceiling supporting elements and the ceiling shall
be constructed of non-combustible materials; and
(b) The exposed surfaces within the concealed space shall
be of Class 0 surface flame spread.
2.3.11.9 Provision of cavity barriers within the concealed spaces of
suspended ceiling is exempted if the following requirements
are complied with:
(a) The concealed space are not used for storage purpose,
and
(b) The supporting elements shall be constructed of noncombustible
material, and
(c) The exposed surfaces within the concealed space is of
Class 0 flame spread, (excluding surfaces of any pipe,
cable, conduit or insulation of any pipe), and
Suspended
ceiling over
protected areas
Standard for Fire Safety in Rapid Transit Systems 72