Dell HT118 Installationsanleitung Seite 13

Figure 1-2. One Rack Unit
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
2 Place a mark 88 mm (3.5 inches) above the original mark you made
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1 U (44 mm [1.75 inches])
CAUTION:
If you are installing more than one system, install the mounting rails
so that the first system is installed in the lowest available position in the rack.
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).
(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).
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12.7 mm (0.5 inch)
15.9 mm (0.625 inch)
15.9 mm (0.625 inch)
12.7 mm (0.5 inch)
Rack Installation Guide
11