On Mon, 4 May 2009 13:22:36 -0500, Bob Brown <bbr...@harpercollege.edu>
wrote: >I'm not an engineer, but I question the thought that 3-phase protects >against the loss of a single phase. That's straight from the z890 Installation and Planning manual, pg 4-1: "Each front end power supply is provided with phase switching redundancy. The loss of an input phase is detected and the total input current is switched to the remaining phase pair without any power interruption. Depending on the configuration input power draw, the system can run from several minutes to indefinitely in this condition. Since most single phase losses are transient which recover in seconds, this redundancy provides protection against virtually all single phase outages." Brian Nielsen
