[marcusr]

Sometimes only A power or B power is delivered to the rack (otherwise you could receive different phases).

Power failures also occur sometimes when the issue is on the wrong side of where power is distributed - we've lost power to our servers when maintenance has gone wrong for example.

[snowy]

From my point of view if you end up with mission critical equipment connected only to A or B power then its engineered wrong.

[edwhitesell]

Very true, but sometimes this happens at fault of the facility, not the affected company. I've been in a facility experiencing widespread power issues because customers were incorrectly delivered A+A or B+B power, instead of A+B.

[Aloha]

This is why I'm a proponent battery floated of DC Power for mission critical systems.