What Is Fire Resistant Cable?

Fire-resistant cable is divided into class A and class B. Class B cable can be in 750 ℃ ~ 800 ℃ flame and rated voltage to withstand burning for at least 90min, and the cable is not broken. In the refractory layer to improve the manufacturing process and increase the refractory layer and other methods based on Class A fire rated cable development, it can be 950 ℃ ~ 1 000 ℃ flame and rated voltage to withstand burning for at least 90min and the cable is not punctured. Class A fire-resistant cable fire performance is better than class B. Also, mineral insulated cable is a better performance of fire-resistant cables made of copper core, copper sheath, magnesium oxide insulation material processing, referred to as MI (mineral insulated cables) cable. MI cable has good fire resistance characteristics and can work for a long time under 250 ℃ high temperature, but also explosion-proof, strong corrosion-resistance, high flow rate, radiation resistance MI cable has the characteristics of explosion-proof, high corrosion resistance, high current carrying capacity, radiation resistance, high mechanical strength, small size, lightweight, long life, and smokeless. However, the price is high. The process is complicated, the construction is difficult in the oil irrigation area, important wooden public buildings, high-temperature places, and other fire-resistant requirements, and the economy can accept the occasion and use fire-resistant cable.