Abstract: Dense insulated busway is widely used in low-voltage power distribution projects. Applying it to power supply of factory equipment can fully improve the power safety of equipment. In this paper, taking S project as an example, this paper introduces the application advantages of dense insulated busway in factory power supply. Reasonable selection of power supply mode, busway cross-sectional area, busway anti-seismic, busway installation and other key points. The sectional area of busway shall be scientifically determined according to the economic current density and the maximum value of continuous operation current. Scientifically calculate the distance between each bus support according to the seismic requirements. Hope to provide reference for relevant units.