Daily Safety and Fire Prevention Question (11.14)
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1. When the wiring is installed concealed, it must be protected by metal conduits or flame-retardant rigid plastic conduits, and it should be laid within a non-combustible structure; the thickness of the protective layer shall not be less than ( ) mm. A.10B.20C.30D.502. The correct inspection requirements for fire sealing are ( ). A. In cable tunnels that are passed through by people, expansion-type fire-resistant steel plates should be used for reinforcement at the bottom of the pre-existing openings. B. Cable shafts should be equipped with expansion-type fire-blocking systems. C. Electrical cabinet openings should be sealed with fire-resistant mineral wool boards. D. The cables on both sides of the fire-blocking system should be coated with cable paint. Reference answers: 1.C 2.D
C1. When the cable is installed concealed, it must be protected by metal conduits or flame-retardant rigid plastic conduits, and it should be laid within a non-combustible structure; the thickness of the protective layer shall not be less than ( C ) mm. A.10B.20C.30D.502. The correct requirement for inspecting fire sealing is ( D ). A. In cable tunnels that are passed through by people, expansion-type fire-resistant steel plates should be used for reinforcement at the bottom of the pre-existing openings. B. Cable shafts should be equipped with expansion-type fire-resistant sealing materials. C. Electrical cabinet openings should be sealed with fire-resistant mineral wool boards. D. The cables on both sides of the fire-resistant sealing system should be coated with cable paint