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support.dell.com Rack Installation Guide 1-3
Marking the Rack
1. Determine where you want to place the bottom of the system.
CAUTION: If you are installing more than one system, install the first sys-
tem in the lowest available position in the rack.
2. Mark the upper and lower-mounting positions on the two posts.
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
2D786bk0.book Page 3 Thursday, January 18, 2001 8:44 PM