The fire-resistant cable can still maintain the normal working of the line for a period of time under the burning conditions. In other words, in the event of a fire, the fire-resistant cable will not burn at once, and it can still maintain normal power supply for a period of time. This characteristic determines that the fire-resistant cable plays an important role in modern cities and industrial buildings, because once the fire occurs, the power supply circuits of the system such as control, monitoring, guidance, and alarm must maintain normal operation.
The main use of fire-resistant cables:
Fire-resistant cables are mainly used in power supply circuits such as emergency power supply to user fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guided lights, emergency power sockets, and emergency elevators.
Staff should pay attention to the following issues when installing fire-resistant cables:
1. When fire-resisting cables are used in cable-intensive cable tunnels, cable mezzanines, or in flammable places such as near oil pipes and oil depots, Class A fire-resistant cables should be used first. When these conditions are removed and the number of cable configurations is small, Class B fire-resistant cables should be used.
2. Fire-resistant cables are mostly used as power supply circuits for emergency power supplies and require normal operation in fire. As the ambient temperature rises rapidly during a fire, in order to ensure the transmission capacity of the line and reduce the pressure drop, for a circuit with a long power supply line and strictly limiting the allowable voltage drop, the section of the fire-resistant cable should be enlarged at least one step.
3, fire-resistant cables can not be used as high-temperature cables.
4. In order to reduce the probability of failure of cable joints in a fire accident, the number of joints should be minimized during installation to ensure that the line can work normally in a fire. If you need to make branch wiring, handle the joints to prevent fire.
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