Dell PowerEdge 1650 Rack Installation Guide - Page 22
Marking the Rack, front and back vertical column of holes see
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www.dell.com | support.dell.com 4 Installing the cable-management arm 5 Routing cables Marking the Rack You must allow 1 U (44 mm or 1.75 inches) of vertical space for each system you install in the two-post rack. Universal-Hole Spacing Racks Industry-standard two-post racks with universal-hole spacing have an alternating pattern of three holes per U with center-to-center 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 1-13). Figure 1-13. Two-Post, Open-Frame Relay Rack Universal-Hole Spacing 44 mm (1.75 inches [1 U]) 12.7 mm (0.5 inch) 15.9 mm (0.625 inch) 15.9 mm (0.625 inch) Wide-Hole Spacing Racks Some two-post racks with wide-hole spacing have an alternating pattern of two holes per U with center-to-center hole spacing (beginning at the top hole of a 1-U space) of 31.7 mm and 12.7 mm (1.25 inches and 0.5 inch) for the vertical column of holes (see Figure 1-14). 1-18 Rack Installation Guide