Dell PowerVault MD3000i Getting Started page 9

Connect the Power Cables and Power Cord Retention Bracket
Connect both power cables to the power supply/cooling fan modules.
Attach the power cord retention bracket to the power supply loop by affixing
the back clasp of the bracket to the top of the loop and the middle clasp to
the vertical middle of the loop. Attach the system power cable to the bracket's
cable clasp. Repeat the procedure for the second power supply.
7
Getting Started With Your System