Dell PowerEdge 2950 Rack Installation Guide - Page 12
that meets EIA-310 standards and mark the rack's front vertical rails with a felt-tipped pen or masking - rack rails
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To mark the rack, perform the following steps: 1 Place a mark (or tape) on the rack's front vertical rails where you want to locate the bottom of the system you are installing in the rack. The bottom of each 1-U space is at the middle of the narrowest metal area between holes (marked with a horizontal line on some rack cabinets-see Figure 1-3). 2 Place a mark 88 mm (3.5 inches) above the original mark you made (or count up three holes in a rack that meets EIA-310 standards) and mark the rack's front vertical rails with a felt-tipped pen or masking tape (if you counted holes, place a mark just above the top hole). This mark or piece of tape indicates where the system's upper edge will be located on the vertical rails (see Figure 1-3). Figure 1-3. Marking the Vertical Rails 1 10 Rack Installation Guide 1 marks on vertical rail (2)