Dell UPS 1000R - Manual (Page 13)

9 Getting Started With Your System |
6 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.
Pull the rail toward the front.
Push the front end of the rail until it fully seats on the vertical rack flange and the hook latch locks
in place.
Installing the Cabinet
7 Slide the cabinet into the rack. Repeat for any additional cabinets.