Server to PDU power cord

The jumper is chosen from two facts: the inlet on the PSU, and the outlet set on the PDU. IEC C13/C14 and C19/C20 are the two pairs used in most racks.

PSU inlet C14	Need a PDU C13 outlet and a C13–C14 jumper
PSU inlet C20	Need a PDU C19 outlet and a C19–C20 jumper
C14 inlet + C19-only PDU	C13–C20 jumper; still 10 A on the C13/C14 side

Which end goes where

C13 into the server C14 inlet. C14 into a PDU C13 outlet. C19 into a server C20 inlet. C20 into a PDU C19 outlet.

Worked pair: Dell PowerEdge R650 + APC AP8941. C13 into the R650. C14 into one C13 outlet. The C19 outlets on that PDU are not for this PSU.

Length

Vendor default jumpers are often 0.6 m, 2 m or about 2 m (HPE A0K02A is 6 ft). A Zero-U PDU in a shallow rack needs a much shorter cord so the loop does not fight the rails.