Dell PowerEdge C6220 II Owner's Manual page 255

Note the routing of the cable on the chassis as you remove them from
the system. You must route these cables properly when you replace
them to prevent the cables from being pinched or crimped.
5 Remove the screw that secures the power cable cover to the power
distribution board 1. See Figure 3-73.
6 Lift it up straight from the locking hole on the power distribution
board 1. Then, lift it completely out of the power distribution board 1.
See Figure 3-73.
Figure 3-73. Removing and Installing the Power Cable Cover
1 screw 2
Removing and Installing System Components | 255
power cable cover