Rack Interior Features; Figure 9. Tail Bar Access For Cables - Dell PowerEdge 2420 Technical Manual

Removable "tail- bars" at both top and bottom of the rear of the rack, shown in Figure 9, make
cabling the IT equipment easier, especially in highly dense environments with three- phase power
cables deployed. The bars can be re- attached after the cables are in place.
Figure 9. Tail bar access for cables

Rack interior features

Each of the PowerEdge rack enclosure form factors accommodates servers with deep chassis
dimensions while allowing space for power and cable management.
PDU trays
In addition to U- space PDU mounting, the PowerEdge rack enclosures have specially designed trays
inside the rear doors to easily mount vertical PDUs, without using any tools, so they won't interfere
with air circulation. These trays are positioned as far back and out from the rear of the equipment as
possible, to reduce contention with cable management arms and equipment with removable
components. The PDU tray design provides more options for mounting various PDU types, and
provides access to the square holes in the rear frame posts for additional cable management
options. Dell vertical mount PDUs are available in a number of sizes and can be combined within a
rack. For more information, see the Rack kit accessories section.
Deep racks have expanded PDU trays in the back of the rack, which can be used for additional
power management or for routing cables. Wide racks have extra distance between the mounting
posts and the sides of the racks, moving the PDU trays even farther away from the rack's mounting
posts and the equipment installed in the rack, which reduces interference between installed
equipment and cables. The trays in the standard and wide racks can hold up to four full- height or
eight half- height units while the deep rack trays can accommodate twice as many.
Note the clearly labeled U markings on the mounting posts for easier installation and service;
markings are provided on both the front and rear mounting posts.
Cable management clips are available for routing cables along the rear mounting posts.
15 PowerEdge Rack Enclosures Technical Guide