Dell PowerVault 715N (Rackmount NAS Appliance) - Manual (Page 12)

Marking the Rack
You must allow 1 U (4.4 centimeters, or 1.75 inches) of vertical space for each system you
install in the rack. Dell rack cabinets and rack cabinets that meet EIA-510 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 rear vertical rails (see Figure 1-3). Rack cabinets
not manufactured by Dell may have round or square holes.
^ NOTE: If you have a Dell PowerEdge™ 4210 rack cabinet, the vertical rails are marked by
horizontal lines and numbers In 1-U Increments. If you wish, 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. If you
choose this method, skip ahead to the procedure "Installing RapidRails Slide Assemblies."
F i g u r e 1 - 3 . O n e R a c k U n i t
1 U (4.4 centimeters or 1.75 inches)
12.7 mm (0.5 inch)
15.5 mm (0.625 inch)
15.5 mm (0.625 inch)
12.7 mm (0.5 inch)
1 - 8 I R a c k I n s t a l l a t i o n G u i d e