Briefly Introduce The Knowledge Of Fire-resistant Wires And Cables

Fire resistant wire refers to the wire that can maintain safe operation for a certain time under the condition of flame combustion. Fire resistance refers to the operation that can be maintained for a certain time under the condition of flame combustion, that is, to maintain the integrity of the circuit. This type of wire has the power supply capacity for a certain time in the flame.

Fire resistant wires can be divided into two grades according to China's experimental standard (gb12666-99): Na and Nb;

The fire-resistant wire can work continuously (transmit current and signal) in case of fire, and whether it is delayed or not is not included in the assessment. The flame-retardant wire will stop working soon in case of fire. Its function is that it is difficult to burn, does not spread and can self extinguish. The fire-resistant wire shall maintain normal operation for 180 minutes in the flame combustion at 750 ~ 800 ℃.

Fireproof wire is actually another type of fireproof wire. It is made of copper as the conducting wire core, seamless copper tube as the sheath and inorganic mineral magnesium oxide as the insulating material.

As the whole is made of inorganic materials, the whole fireproof wire will neither burn nor delay combustion. And can withstand fire. The test shows that after burning in the flame of 800 ~ 900 ℃ for 2 hours, the wire has been running normally. After burning in the flame of 1000 ℃ for 30 minutes, it is still intact and continues to operate normally. Generally, the normal working temperature is 250 ℃, which can operate safely and reliably.

In recent years, with the continuous improvement of people's material and cultural living standards, China's gradual attention to fire prevention and the gradual improvement of people's safety awareness. In order to improve the safety level of electrical lines and reduce the occurrence and loss of electrical fire accidents, China has successively promulgated some electrical design specifications and clearly stipulated that fire-resistant cables should be used in some important electrical lines or places. The demand for flame-retardant and fire-resistant wire and cable products in China is increasing year by year, especially the demand for fire-resistant cables, In short, in order to ensure the fire safety of public places and other important occasions, we should vigorously promote the selection of fire-resistant and flame-retardant, low smoke and halogen-free fire-resistant cables that are pure to the environment.