Dell PowerEdge R520 Technical Manual page 32

The static rails (shown in Figure 9) support a wider variety of racks than the sliding rails but do not
support serviceability in the rack and are therefore are not compatible with the CMA.
One key factor in selecting the proper rails is identifying the type of rack in which they will be
installed. Both the sliding rails and the static rails support tool-less mounting in 19"-wide, EIA-310-E
compliant square hole and unthreaded round hole 4-post racks. Both also support tooled
mounting in threaded hole 4-post racks, but only the static rails, as the more universal solution,
support mounting in 2-post (Telco) racks.
Table 18 lists the rack types that the R520 supports.
Rail
Product
Identifier
B6
R520
B4
Screws are not included in either kit due to the fact that threaded racks are offered with a variety of
thread designations. You must provide your own screws when mounting the rails in threaded racks
Screw head diameter for the sliding rails must be 10 mm or less.
Other key factors governing proper rail selection include the spacing between the front and rear
mounting flanges of the rack, the type and location of any equipment mounted in the back of the
rack such as power distribution units (PDUs), and the overall depth of the rack. Due to their reduced
complexity and lack of need for CMA support, the static rails offer a greater adjustability range and a
smaller overall mounting footprint than the sliding rails.
For detailed information about static and sliding rails, see the Rack rail specifications section in
Appendix A. For more information on installing the R520 in a rack, see the
Instructions
on Support.Dell.com/Manuals.
Mounting Interface
ReadyRails II
ReadyRails
Rack Types Supported
Rail Type 4-Post
Square Round

Sliding

Static
2-Post
Thread Flush Center
X
 
  
Rack Installation
X
