Dell PowerEdge 1850 - Manual (Page 12)

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Rack Installation Guide
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.
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 1-4).
2 Place a mark 44 mm (1.75 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 1-4).
Figure 1-4. Marking the Vertical Rails
tape on vertical rail