Dell PowerEdge 2550 Rack Installation Instructions page 38

Connect the remaining cables to the system.
6
For details, see your system's Installation and Troubleshooting Guide or the
User's Guide.
Secure the cables to the cable-management arm:
7
a
b
c
Slide the system in and out of the rack to verify that the cables are routed correctly and
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do not bind, stretch, or pinch with the movement of the cable-management arm.
You have completed the installation of the RapidRails kit in a four-post rack cabinet.
1-32 Rac k I n st allat io n G uide
After connecting the cables to the system, unscrew the thumbscrews that secure
the front of the server to the front vertical rail.
Slide the system forward to the fully extended position.
Route the cables along the cable-management arm, allowing some additional
cable slack at the hinge positions, and secure the cables to the cable-management
arm with the Velcro straps attached to the cable-management arm.
NOTE: As you pull the system out to its furthest extension, the slide assemblies lock in the
extended position. To push the system back into the rack, press the green locking latch on
the side of the slide to release the locks, and then slide the system completely into the rack.