Dell PowerEdge SC1435 Rack Installation Guide - Page 33
Wide-Hole Spacing Racks
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Wide-Hole Spacing Racks Racks with wide-hole spacing have an alternating pattern of two holes per rack unit 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 front and back vertical columns of holes (see Figure 2-3). Figure 2-3. Two-Post, Open-Frame Relay Rack Wide-Hole Spacing 1 U (44 mm or 1.75 inches) 12.7 mm (0.5 inch) 31.7 mm (1.25 inches) To mark the rack, perform the following steps: 1 Place a mark on the rack's front vertical rails where you want to locate the bottom of the system you are installing in the two-post rack. The bottom of each 1-U space is at the middle of the narrowest metal area between holes. NOTE: If your rack has wide-hole spacing, go to step 3. 2 Place a mark 44 mm (1.75 inches) above the original mark you made (or count up three holes in a rack with universal-hole spacing) (see Figure 2-2). Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with universal-hole spacing has three holes with center-to-center spacing between holes (beginning at the top 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) (see Figure 2-2). NOTE: If your rack has universal-hole spacing, you have completed the procedure for marking the rack. 3 Place a mark 44 mm (1.75 inches) above the original mark you made (or count up to the next hole in the rack with wide-hole spacing (see Figure 2-3). Each 1 U (44 mm, or 1.75 inches) of vertical space on a rack with wide-hole spacing has two holes with center-to-center spacing between holes (beginning at the top of a 1-U space) of 31.7 mm (1.25 inches) (see Figure 2-3). Two-Post Rack Installation 31