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What should be paid attention to when installing fire-resistant cable
With the development of electricity, people’s living standards have been greatly improved, and fire accidents have also occurred from time to time. Therefore, fire-resistant cables and flame-retardant cables have also been greatly developed. Fire-resistant cables, to some extent, provide security for our personal safety and are increasingly used in various industries.
Because of the special nature of his properties, fire resistance is mainly used in emergency power supply to user fire protection equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guided lights, emergency power outlets, emergency elevators and other power supply circuits. Staff must install fire-resistant cables. Note the following questions:
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.
In the increasingly frequent accidents, fire-resistant cables are widely used, so we must understand some of the cable characteristics to avoid some accidents.