The IBM 7040 Model 61R System Rack provides space for mounting system drawer components for pSeries servers such as the pSeries 690 Central Electronics Complex (7040-681) and the 7040-61D I/O drawers. The Model 61R is a 24-inch rack which provides 42U of rack space. The 7040-61R utilizes a 350 V DC bulk power subsystem to provide power for the components within the rack. The bulk power subsystem incorporates redundant bulk power assemblies mounted in the front and rear sections of the top 8U of the rack.