IBM Power System 9008-22L Manual page 75

Figure 42. Connecting the power cords
9. If the cable management arm is open, close it by completing the following steps:
a) Swing the cable management arm towards the server.
b) Insert the inner cable management arm tab (A) into the outer mounting bracket (B) until it clicks
into place as shown. The inner mounting bracket (C) is not used on the left side.
Installing, removing, and replacing PCIe adapters in the 9008-22L, 9009-22A, or 9223-22H system 61