Dell PowerVault 770N (Deskside NAS Appliance) - Manual (Page 13)

Marking the Rack
You must allow 5 U (8.75 inches) of vertical space for each system you install in the rack
(see Figure 1-5).
Figure 1-3. One Rack Unit
1 U (44 mm or 1.75 inches)
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□
□
□
□
12.7 mm (0.5 inch)
15.6 mm (0.625 inch)
15.6 mm (0.625 inch)
12.7 mm (0.5 inch)
/t\ CAUTION: If you are installing more than one system, install the slide assemblies
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 on the rack’s front vertical rails where you want to locate the bottom of
the system you are installing in the rack cabinet.
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-B).
Place a mark approximately 8.75 inches above the original mark you made (or count up
15 holes in a rack that meets EIA-510 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).
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