Dell PowerEdge M520 Rack Installation Guide - Page 14

If you counted holes, place a mark just above the top hole. This mark

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Figure 1-3. One Rack Unit 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) 12.7 mm (0.5 inch) 2 Mark the rack's front vertical rails with a felt-tipped pen or masking tape approximately 44.45 cm (17.5 inches) above the original mark you made (or count up 30 holes in a rack that meets CEA-310-E standards). (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 1-4). 12 Rack Installation Guide

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12
Rack Installation Guide
Figure 1-3.
One Rack Unit
2
Mark the rack’s front vertical rails with a felt-tipped pen or masking tape
approximately 44.45 cm (17.5 inches) above the original mark you made
(or count up 30 holes in a rack that meets CEA-310-E standards).
(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 1-4).
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)
12.7 mm (0.5 inch)