Dell PowerEdge C6220 Hardware Owner's Manual page 206

Figure 3-61. Removing and Installing the Middle-Wall Bracket
1 middle-wall bracket
7 Disconnect all the cables from the upper middle plane.
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.
8 Remove the screw that secure the power cable cover to the upper
middle plane. See Figure 3-62.
9 Lift it up with a slight inclination to release it from the locking hole on
the upper middle plane. Then, lift it completely out of the upper
middle plane. See Figure 3-62.
206 | Installing System Components
2 screw (6)