Server cabinets require approximately 4 feet (120 cm) of space in front and 3 feet (90 cm) in back (Figure 1-5) for access by service personnel.
Server and expansion cabinets can be placed next to each other, without space between them, since there are no side clearance requirements during operation. To access and remove side panels, however, allow approximately 1 foot (30 cm) of space on the sides.
The server system (including expansion cabinets) should have a dedicated AC breaker panel. The server system should not share this breaker panel with other, unrelated equipment.
Keep power and interface cables out of the way of foot traffic. Cables can be routed inside walls, floors, ceilings, or in protective channels. Interface cables should be routed away from motors and other sources of electric/magnetic or radio frequency interference.
If the cabinet is installed on a raised floor, conditioned air should be directed to the bottom of each rack through perforated panels.