Dell PowerEdge C6220 - Manual (Page 250)

250 | Installing System Components
8 Remove the screw that secure the power cable cover to the upper
middle plane. See Figure 3-69.
9 Lift it up straightly from the locking hole on the upper middle plane.
Then, lift it completely out of the upper middle plane. See Figure 3-69.
Figure 3-69. Removing and Installing the Power Cable Cover
1 screw 2 power cable cover