Dell PowerEdge 1950 Rack Installation Guide - Page 32
Installation Tasks, Marking the Rack, Universal-Hole Spacing Racks
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Installation Tasks Installing a two-post rack kit includes performing the following tasks in order: 1 Marking the rack • Universal-hole spacing rack • Wide-hole spacing rack 2 Installing the mounting rails in the rack • Center-mount installation • Flush-mount installation 3 Installing the system in the rack 4 Routing cables Marking the Rack You must allow 1 U (44 mm, or 1.75 inch) of vertical space for each system that you install in the two-post rack. Universal-Hole Spacing Racks Racks with universal-hole spacing have an alternating pattern of three holes per rack unit with center-tocenter hole spacing (beginning at the top hole of a 1-U space) of 15.9 mm, 15.9 mm, and 12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) for the front and back vertical column of holes (see Figure 2-2). Figure 2-2. Two-Post, Open-Frame Relay Rack Universal-Hole Spacing 1 U (44 mm or 1.75 inches) 12.7 mm (0.5 inch) 15.9 mm (0.625 inch) 15.9 mm (0.625 inch) 30 Two-Post Rack Installation