Development and Application of MHYV LSZH flame retardant cable

In the past more than 20 years of practice,  MHYV cable has experienced by innovation from Non flame-retardant to flame retardant, especially in the flame retardant cable flame retardancy test method and decision rule (386-1995, MT MT386-2011) issued and implemented, make the flame retardant properties of the mining cable effectively controled and improved.

But the existing MHYV flame retardant cable once heated combustion, the combustion release a large amount of smoke. Although with IEC 61034 or GB/T 61034-1998 measure the light transmittance of under 10%, but the release of hydrogen chloride (HCl) gas content is large, its content is more than 100 mg/g, even up to 200 ~ 300 mg/g. So thick smoke and toxic gases such as H2S and CO of human respiratory irritation and mischief, and narrow in underground environment, the affected people could not escape from the scene of the fire. According to foreign fire white paper records, this kind of "secondary disasters" casualties of personnel accounts for 70% ~ 80% of the entire fire casualties. In China's coal mine fire accident casualties, the number of people suffering from "secondary disasters" proportion is very big.

Flame retardant or Non flame-retardant cable materials will release a large amount of smoke and CO, HC1 gas when burning, in order to avoid or reduce fire accident "secondary disasters", the international electrotechnical commission (IEC) in 1982 and 1982 successively formulated and revised and IEC60754 IEC60754-1-2, in order to limit when releasing gas content (HC1 content < 5 mg/g, release the corrosive gas combustion of the aqueous solution pH > 4.3, conductivity < 10 TTS/ram). In 1991 and established IEC61034, in order to limit when releasing amount of smoke (smoke light transmittance > 60%). The country's naval engineering standard NES a 718 and a NES 713. The U.S. navy MILS24643 directly the NES a 713 standard to detect when releasing toxic gas content (regulation toxicity index < 5).

All these standards to restrict the cable such as flame retardant or not smoke and poison gas released by the combustion flame retardant materials provides effective and reliable basis, but in this high-risk industry, the mining cable in our country on the control of the LSZH cable is almost blank. When coal with low smoke and low halogen flame retardant burning pollution to the environment is smaller than the burning flame retardant cable, namely coal with flame retardant halogen free cable to reduce or reduce when the burning of "secondary disasters; At the same time performance can meet the requirements of coal mine cable material, is the main direction in the future. Research and application of MHYV low smoke low halogen flame retardant cable is very necessary and important.

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