Dell PowerEdge C6105 Getting Started Manual page 9

Connecting the Power Cable (s)
Connect the system's power cable(s) to the system and, if a monitor is used,
connect the monitor's power cable to the monitor. Plug the other end of the
power cables into a grounded electrical outlet or a separate power source
such as an uninterrupted power supply or a power distribution unit.
Getting Started With Your System | 7