In addition to the conductive function of ordinary busways, fire-resistant busways also need to maintain circuit integrity for a certain period of time under flame conditions. Our company's fire-resistant busway trunking products not only meet the national standard GB7251.2, but also comply with the GA/T537-2005 standard. The conductor surface is wrapped with at least 3 layers of mica tape insulation (heat-resistant ≥ 1100 ° C), and silicon wool (heat-resistant>1600 ° C) insulation is used between the conductor and the shell. The shell is made of high-quality steel plate, and the surface of the shell is derusted, degreased, phosphated and dried before electrostatic spraying with refractory powder to prevent the shell from burning in a flame state. The shell structure is in the shape of inner and outer grooves, which prevents flames from directly or indirectly burning conductors and damaging insulation, and ensures the necessary protection level and circuit integrity under spraying conditions.