Which of the following construction requires a fire rating period?
(1) Non-load-bearing partition walls between retail shops inside a shopping arcade of a single owner and management
(2) Reinforced concrete roof slab above the office portion of a 40-storey high office tower
(3) A steel footbridge with 1.1m parapet connecting two residential towers inside a private residential development
(4) A 1500 sq. m. by 4.5m high single storey steel building for industrial use, with all sides setback from the site boundary by 8 metres
A. (1) and (4) only
B. (2) and (3) only
C. (3) and (4) only
D. none of the above
ans: B[i m sure that options (1) & (4) 應該唔駛FRR
]
我反而覺得係A
1) Partition walls separating different occupancies shall have adequate FRR
2) If not refuge roof/forming part of MoE, no need FRR
3) Not all cases require FRR for linked bridge
4) External walls shall have FRR wor
i m sure that options (1) & (4) 應該唔駛FRR (re. "copy & paste" from fire code 2011)
Clause C7.3
Provided that the fire compartment area limitations in Table C1 are complied with, separation by fire barriers are not required between different occupancies for the following
uses:
(a) Use Classification 4a; or <--- offices
(b) Retail shops in Use Classification 4b.
For shopping arcade, retail shops are not required to be separated from the common arcade or mall area by fire barriers taking into account that the shops are under a common management and a common fire alarm system actuated by a sprinkler alarm or by break glass points is installed.
Clause C4.3
Where a single-storey building does not exceed 7,000m³ in volume and 7.5m in height, any steelwork construction may be unprotected, provided that the building is separated from any adjoining building or the site boundary by a clear unobstructed open space not less than 6m
in width.
咁答案係b定d 
