Dell PowerEdge C6220 II Mise En Route page 11

Connecting the Power Cable(s)
Figure 6. Connecting the Power Cable
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.
NOTE: Your system can support up to two 1200 W power supply units (100-240 VAC
nominal input voltage) or up to two 1400 W power supply units (200-240 VAC nominal
input voltage).
Getting Started With Your System | 9