The product is applicable to power distribution network of frequency rated voltage 0.6/1kV or below or fixed lay in industrial devices. It is suitable for sites with no halogen, low smoke and fire retardant requirement and high safety and environmental protection requirements such as high-rise, station, metro, airport, hospital, large library, gym, villa, domestic housing, hotel, office building, school, mall and other sites of dense population. The product releases small amount of fume and no toxic substance upon combustion.