PURPOSE: A fire-resistant bus duct is provided to improve the safety of a whole system by improving connection safety of a general bus duct. CONSTITUTION: A fire-resistant bus duct comprises a external case(30), a busbar(10) and an insulation part(20). A busbar is composed of a conductor. The insulation part surrounds the bus bar. The insulation part is composed of epoxy. The thickness of the insulation part is greater than 380um. The external case stores the busbar and the insulation part. The thickness of the external case is greater than 2.5mm. An uneven portion is formed in the surface of the external case.
