Dell PowerEdge 2550 Rack Installation Instructions page 10

F i g u r e 1 - 2 . Tw o - P o s t , O p e n - F r a m e R e l a y R a c k W i t h U n i v e r s a l - H o l e
S p a c i n g
If your rack has wide-hole spacing (see Figure 1-3), mark the lower and middle
5
mounting positions on the vertical rails as shown by the bottom and middle
V-notches on the sides of the template.
Each 1-U (1.75-inch) vertical space on a rack with wide-hole spacing has two holes
with center-to-center spacing between holes (beginning at the top of a 1-U space) of
1.25 inches (see Figure 1-3).
1-4 Ra c k I n st allat io n G u ide
3.5 inches (2 U)
1.75 inch (1
.625
.5 inch
.625