We are building a high-end server currently in our office for a client. We wanted to show you all what a dual power supply looks like.
This is common in servers and other high-end computers. Each power supply is capable of powering the entire server and only one runs at a time. Each power cord will plug into a separate circuit, therefore keeping the system up and running if there is a power failure! The switch between the power supplies is seamless, so as not to interrupt the normal use of the server.
This is Power Redundancy and is necessary in business applications where downtime will impact users or customer access to information and applications.
Tech talk.. think of it as a RAID 1 but for a PSU!