NHMC series mineral fire-resistant Bus duct is a new generation of functional Bus duct developed on the basis of steel intensive Bus duct. The bus bar uses high-performance mineral fire-resistant insulation materials, forms an insulation layer on the bus bar surface to ensure heat resistance and insulation performance, and is clamped and fixed with double-layer steel plates to ensure the overall mechanical performance of Bus duct; The Aluminium silicate cotton felt with a temperature resistance of 1250 ° is filled between the double steel plates to ensure the fire resistance; The Bus duct can withstand pressure combustion test conditions with temperature up to 1100 ° for 180 minutes to ensure the integrity of the electrical circuit.