Development trend of mining cable technology

The coal mine cable in the past 20 years of practice process, experienced from non-flame retardant to flame retardant innovation, especially in the coal mine flame retardant cable flame retardant test method and determination rules (MT 386-1995, MT386-2011) issued since the implementation, the coal mine cable flame retardant performance has been effectively controlled and improved.

However, the current flame retardant cables used in coal mines (most of which use chlorine-containing polymers as sheathed materials) will release a large amount of smoke once they are heated and burned. Although the transmittance measured by IEC 61034 or GB/T 17651-1998 is below 10%, the release of hydrogen chloride (HCl) gas content is very large, its content is more than 100 mg/g, even 200 ~ 300mg/g. Such thick smoke, coupled with H2S and CO and other toxic gases, can irritate and poison human respiratory system. In the narrow environment of underground mine, the affected personnel cannot escape the fire scene at all.

According to the white paper of foreign fire protection, the casualties of this "secondary disaster" accounted for 70 ~ 80 percent of the total number of fire casualties.

In our coal mine fire accident casualties, the proportion of victims of secondary disasters is also very large.