Dell UPS 5600R - Manual (Page 19)

19 Installation |
5 Attach the rails to the rack:
Engage the back end of the rail until it fully seats on the vertical rack flange and the hook latch
locks in place (see Figure 9).
Pull the rail just past the front of the rack.
Push the front end of the rail until it fully seats on the vertical rack flange and the hook latch locks
in place.
Figure 9. Installing the Rails