Our data center/server room has two different utility sources, same utility company, but our building is big enough that we have power coming into the building from both the north & south ends and the two circuits are independent of each other. The south end feeds most of the building, except the far north end and is covered by a whole building generator. The north end source, has a small 30Kva generator that feeds the IT offices and a second circuit for the server room. Behind each server rack we have two 20A circuits, left is whole building circuit, right is IT circuit. In the bottom of each rack, we have a single UPS 2000va that connects to the IT circuit PDU. Their only purpose is to clean up utility power and keep things going for the few seconds it takes for generators to kick in. All critical servers have dual power supplies and...
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