Dell PowerVault MD1000 Rack Installation Guide - Page 12

Removing the Rack Doors, Marking the Rack, For a 3-U system, you must allow 3 U 132 mm - weight

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Removing the Rack Doors See the procedures for removing doors in the documentation provided with your rack cabinet. CAUTION: Because of the size and weight of the rack cabinet doors, never attempt to remove or install them by yourself. CAUTION: Store the doors where they will not injure someone if the doors accidently fall over. Marking the Rack For a 3-U system, you must allow 3 U (132 mm, or 5.25 inches) of vertical space for each system you install in the rack. Rack cabinets that meet EIA-310 standards have an alternating pattern of three holes per rack unit with center-to-center hole spacing (beginning at the top hole of a 1-U space) of 15.9 mm, 15.9 mm, and 12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) for the front and back vertical rails (see Figure 1-3). Rack cabinets may have round or square holes. NOTE: The vertical rails may be marked by horizontal lines and numbers in 1-U increments. If you want, you can make a note of the number marking on the rack's vertical rail. It is not necessary to mark or place tape on the rack. 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) 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. 10 Rack Installation Guide

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10
Rack Installation Guide
Removing the Rack Doors
See the procedures for removing doors in the documentation provided with your rack cabinet.
CAUTION:
Because of the size and weight of the rack cabinet doors, never attempt to remove or install them
by yourself.
CAUTION:
Store the doors where they will not injure someone if the doors accidently fall over.
Marking the Rack
For a 3-U system, you must allow 3 U (132 mm, or 5.25 inches) of vertical space for each system
you install in the rack.
Rack cabinets that meet EIA-310 standards have an alternating pattern of three holes per rack unit with
center-to-center hole spacing (beginning at the top hole of a 1-U space) of 15.9 mm, 15.9 mm, and
12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) for the front and back vertical rails (see Figure 1-3).
Rack cabinets may have round or square holes.
NOTE:
The vertical rails may be marked by horizontal lines and numbers in 1-U increments. If you want, you can
make a note of the number marking on the rack’s vertical rail. It is not necessary to mark or place tape on the rack.
Figure 1-3.
One Rack Unit
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.
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)