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support.dell.com Rack Installation Guide 1-3
Marking the Rack
CAUTION: If you are installing more than one system, install the first
system in the lowest available position in the rack.
1. Determine where you want to place the bottom of the system.
2. Place the 1-U template over the front of the rack in the desired location.
3. Align the bottom of the template with the desired bottom position of the system
chassis.
4. Mark the upper and lower mounting positions on the vertical rails as shown by
the V-notches on the sides of the template.
Each 1-U (1.75-inch) vertical space has three holes, with center-to-center spacing
between holes (beginning at the center of the top hole of a 1-U space) of 0.625,
0.625, and 0.5 inch (see Figure 1-2).
Figure 1-2. Two-Post Open-Frame Relay Rack 1-U Hole Spacing
1.75 inches (1 U)
0.5 inch
0.625 inch
0.625 inch
0.5 inch