The correct choice of
wire and cable and reasonable wiring are directly related to the fire safety of the building. Engineering applications should be strengthened in standardization and standardization. Formulate scientific and concrete plans to provide basis for wire and cable fire protection and electrical wiring of fire fighting equipment in engineering design, so that it can be safe, reliable, technologically advanced, and economically reasonable. It can effectively prevent fire caused by wire and cable and reduce the risk of fire. Casualties and property damage.
Fire prevention principle
The basic principle for the laying of fire protection on the cable line is not to extend the flame after a fire;
1 Prevent cables from catching fire.
2 Take effective fire prevention measures along the cable path or flammable zone;
3 to achieve its own flame retardant cable.
Fire prevention measures
Fire prevention measures should be taken. 1 When laying cables under the following conditions.
Super high-rise buildings should be blocked on each floor, 1 when the cable passes through different fire zones; 2 the cable is laid vertically across the floor along the shaft. Other buildings may be blocked at every 23 floors; 3 at the partitions of cable tunnels, cable trenches, and cables; 4 at fire resistance limits not less than 1h at partitions; 5 at buildings crossing partitions; , or to the channel population of the power distribution room and control room; 7 the cable leads to the openings of electrical cabinets, plates or control panels, tables;
2 Keep away from heat and fire
Cables shall not be laid; insulation shall be taken if laid in the heat pipe trenches. Electrical installations with explosion and fire hazards should not be installed; cable runs should be kept as far away as possible from steam and oil pipelines; flammable gas and flammable liquids.
3Set up fire alarm system
Select the appropriate alarm probe and alarm system suitable for the characteristics of the cable layer. At present, a wide range of linear (or cable) temperature sensitive detectors are used in cable trenches and pipeline wells; according to actual conditions.
4 High pressure water spray
It is difficult to use general fire extinguishing materials, cable corridors, and cable-intensive areas. High-pressure water spray fire extinguishing methods should be adopted. In order to make the water spray extinguishment work effectively in time, a highly sensitive monitoring and control system needs to be configured. This method is effective in large buildings and cable tunnels.
5 Strengthen cable layer (well) ventilation
As far as possible in the cable layer * external wall vents (the specific settings of the vent can be combined with a breakthrough in the fire fighting) at the same time should also establish uninterrupted power supply mechanical exhaust system, and actively use the natural ventilation conditions. In order to open the exhaust fan by automatic alarm linkage at the beginning of the fire.
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