BSM7 cast-type fireproof and waterproof bus duct is a bus duct independently developed by our company. The outer shell is made of special resin material and is completed according to special formula and process. This series of products has the functional characteristics of acid corrosion resistance, waterproof and fireproof, and the protection level reaches the highest level IP68. It is mainly used in special working environments, can work continuously in water, and can also meet the requirements of fire protection environment. This series of products has passed the cruel experiments such as GB7251.6-9.101 verification of preventing the spread of flames and GB7251.6-9.102 verification of fire resistance in building structures, and fully meets the requirements. Fire-resistant facilities are added to this structure, which can be upgraded to fire-resistant bus duct. After the fire resistance performance verification of the National Fire Inspection Center of the Ministry of Public Security, the integrity and protection level of the circuit are guaranteed under flames for a long time, reaching the standards of fire-resistant bus duct.