Installing Rack Components 5-13To install your PDU:1. Place two cage-nuts (Figure 5-9,A) on each rail at the location you havechosen to mount your PDU.2. Secure the PDU to the rails using the black plastic washers and plated-finishscrews (Figure 5-9, C).3. Using a self-tapping screw, connect the green ground strap(Figure 5-9, D) to the rail.4. Connect the AC power cord to the PDU.5. If you install your PDU behind the keyboard tray, midway up the rack ratherthan in the bottom of the rack, dress and secure the power cable to providesome strain relief to the cable connection.Installing a Keyboard TrayNote: Some keyboard tray models are front-mount only,and are secured only to the front rails. Your keyboard traymay not look like the model pictured in Figure 5-10.This section describes how to install a keyboard tray into a system rack.The keyboard tray provides you with:! a convenient work surface that stores your keyboard and mouse! a secured compact enclosure when your keyboard and mouse are not inuseFront RailRear RailsABCFigure 5-10. Securing the Keyboard Tray