JZD Wire & Cable Factory
More Than 20 Years Experience
More Than 20 Years Experience
Author: Joey 
September 06,2022
The difference between flame-retardant cables and fire-resistant cables in power cables
The difference between flame-retardant cables and fire-resistant cables in power cables, fire-resistant wires and cables are the general term for wires and cables with fire-resistant functions, which are usually divided into flame-retardant wires and cables and fire-resistant wires and cables. However, there are often many people who cannot distinguish between flame-retardant cables and fire-resistant cables, and are simply confused.
The flame retardant cable is a kind of fire-resistant cable with better functions. It is made of copper core, copper sheath and magnesium oxide insulating material, referred to as MI (minerlinsulated cables) cable.
The refractory layer of the cable is completely composed of inorganic substances, while the refractory layer of ordinary refractory cables is composed of inorganic substances and general organic substances. Therefore, the fire resistance of MI cables is better than that of ordinary refractory cables and will not be decomposed and corrosive due to burning. gas.
MI cables have good fire resistance properties and can operate at a high temperature of 250 °C for a long time. At the same time, they also have explosion-proof, strong corrosion resistance, large current carrying capacity, radiation resistance, high mechanical strength, small size, light weight, long life, and no smoke. specialty.
However, the price is expensive, the process is complicated, and the construction is difficult. In oil-irrigated areas, important wooden public buildings, high-temperature places and other occasions with high fire resistance requirements and acceptable economic performance, this kind of cable with good fire resistance can be used.
Fire-resistant cables are divided into class A and class B. The fire-resistant function of class A fire-resistant cables is better than that of class B.
Class B cables can withstand incineration for 90 minutes in a flame at 750 ° C ~ 800 ° C and additional voltage without the cable being broken down (that is, the 3A fuse is not blown).
On the basis of improving the manufacturing process of the refractory layer and adding the refractory layer, a class A fire-resistant cable has been developed, which can withstand burning for at least 90 minutes in the flame of 950 ℃ ~ 1000 ℃ and additional voltage without the cable being broken down ( That is, the 3A fuse is not blown).
Flame retardant cables maintain the electrical and physical and chemical functions of ordinary cables, and have self-extinguishing properties. Very short, or the flame retardation length is very short.
