NEC Express5800 series User Manual page 186

Insert the device carrier into the backup device bay.
16.
Push the device carrier as far as it will go. It is locked when a "click" is heard.
NOTE: Be careful not to catch the connected power extension cable in
inserting the device carrier.
Connect the SCSI cable and power cable (connector P3) to the device.
17.
Use the SCSI cable provided with this server. Connect the other end of the SCSI cable
to the SCSI connector on the SCSI controller board or the system board (if no cable is
connected there).
176 Upgrading Your NEC Storage
Power extension cable
Power cable (P3)