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Fire-resistant cable in the combustion conditions can still maintain the line for a period of normal work, that is, in case of fire, fire-resistant cable will not be burning at once, it can still maintain a period of normal power supply. This characteristic determines that the fire-resistant cable plays an important role in modern city and industrial buildings, because once the fire occurs, the power supply circuit of the system such as control, monitoring, guidance and alarm must be maintained normally.
The main use of fire-resistant cable:
Fire-resistant cables are mainly used in emergency power supply to the user fire equipment, fire alarm equipment, ventilation and smoke equipment, guide lights, emergency power outlets, emergency elevator and other power supply back to the road.
The following issues need to be noted by staff when installing fire-resistant cables:
1, when the fire-resistant cable used in cable-intensive cable tunnels, cable interlayer, or located in the tubing, oil depots near flammable places, should first choose a type of fire-resistant cable. Remove these conditions, and the number of cable configuration is small, should choose Type B fire-resistant cable.
2, fire-resistant cables are mostly used as an emergency power supply circuit, the requirements of fire normal work. As a result of fire environment temperature rise sharply, in order to ensure the transmission capacity of the line, reduce the pressure drop, for longer power lines and strictly limit the allowable voltage drop of the circuit, the fire-resistant cable section should be enlarged at least one gear.
3, fire-resistant cable can not be used as a high-temperature cable.
4, in order to reduce the cable joint in the fire accident probability, in the installation should minimize the number of joints to ensure that the line in the fire can work properly. If you need to do branch wiring, should do a good job of fire treatment joints.