Myth 2
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Myth 2: When an automatic fire suppression system is installed locally, what is the maximum allowable floor area for a fire compartment? As shown in the figure below, assuming that Sa+Sb represents the maximum allowable floor area for a fire compartment, when the area equipped with an automatic fire extinguishing system is 2Sa, then the area of this fire compartment can be increased by Sa (m²), i.e., S=2Sa+Sb. The additional Sa area should also be equipped with an automatic fire extinguishing system. ▲[Case 6 in the 16th edition of the case study textbook] In a certain fire compartment on the basement floor of this building, the area without an automatic fire extinguishing system is 200㎡. What should be the maximum area for which an automatic fire extinguishing system is required? ( )㎡ A. 600 B. 500 C. 700 D. 800
Myth 3: Under what circumstances can the maximum allowable area of a fire compartment in a store’s sales area or exhibition hall be 10,000㎡? For the shop showrooms and exhibition halls in buildings with fire resistance ratings of Class I or II, when automatic fire extinguishing systems and automatic fire alarm systems are installed and non-combustible or difficult-to-burn decorative materials are used, the maximum allowable floor area for each fire compartment shall comply with the following provisions: 1 When located in high-rise buildings, it shall not exceed 4000㎡ ； 2 When installed in a single-story building or only on the ground floor of a multi-story building, it should not exceed 10,000㎡ ； 3 When installed underground or semi-underground, it should not exceed 2000㎡. When multi-story store premises are equipped with automatic fire extinguishing systems and automatic fire alarm systems, and use non-combustible or difficult-to-burn decorative materials, the maximum allowable floor area for each fire compartment shall be calculated in accordance with Table 5.3.1 of the Building Code. Only when the store’s sales area and exhibition hall are located in a single-story building or solely on the first floor of a multi-story building, can the maximum allowable floor area for each fire compartment be 10,000㎡. ▲【Question 74 from the 2016 practical exam】A shopping mall with a reinforced concrete structure, having a building height of 23.8 m. Among them, floors 1 to 5 below ground level serve as commercial spaces, while floor 2 below ground level is used as a garage and for housing equipment. The entire building is equipped with automatic sprinkler systems and automatic fire alarm systems, and its interior is fitted with non-combustible materials. Which of the following approaches to dividing the building into fire compartments is incorrect? A. The largest floor area of any fire compartment on the ground floor is 9,900㎡. B. The largest floor area of any fire compartment on the basement floor is 1,980㎡. C. The largest floor area of any fire compartment on the second floor above ground is 4,950㎡
The question is flawed; it should be that Sa specifies the automatic sprinkler system, and the maximum allowable area for a fire compartment is 2Sa+Sb. All 2Sa facilities should be equipped with automatic sprinkler systems.
Is the first one supposed to be 600?