Why data centers didn’t adopt 48V DC. DC racks have a long history- and if you are not currently using DC power distribution, ... The first Open Rack designs used Facebook’s 12V DC bus bar design, but ...

The Open Compute Project (OCP) emerged from Facebook with a scheme for Open Racks driven by bus bars. Open19 (now the SSIA) came up with an alternative idea, and both had to handle both 12V and 48V ...