Dell PowerEdge C6220 Hardware Owner's Manual page 224

4 Disconnect all the cables from the first power distribution board. See
Figure 3-66.
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 secure the power cable cover to the power
distribution board 1. See Figure 3-61.
6 Lift it up straightly from the locking hole on the power distribution
board 1. Then, lift it completely out of the power distribution board 1.
See Figure 3-61.
Figure 3-61. Removing and Installing the Power Cable Cover
1 screw
224 | Installing System Components
2 power cable cover