Tiankang fire-resistant cable is a cable that can maintain a safe operation for a certain period of time under the condition of flame combustion. China's national standard GB12666.6 (such as IEC331) will be fire test A, B two levels, A-class flame temperature 950 ~ 1000 °C, continuous fire time 90min, B-class flame temperature 750 ~ 800 °C, continuous fire time 90min During the entire test period, the test specimen shall withstand the rated voltage of the product. Fire-resistant cables are widely used in places such as high-rise buildings, underground railways, underground streets, large-scale power stations and important industrial and mining enterprises in areas related to fire safety and fire-fighting rescue, such as fire-fighting equipment and emergency lights and other emergency facilities such as power supply lines and control lines.
The use of Tiankang fire-resistant cable precautions According to the specific characteristics of Tiankang fire-resistant cables, designers should pay attention to the following issues when designing:
(1) When day fire resistant cables are used in cable-dense cable tunnels, cable mezzanines, or in flammable places such as near oil pipelines and oil depots, Class A fire-resistant cables should be used first. In addition to the above cases and when the number of cable configurations is small, Class B fire-resistant cables can be used.
(2) Tiankang 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) Tiankang fire-resistant cables cannot 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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