Hi dsk with the 230 volt system presumably you get 230 phase to phase and 127 volts to earth/neutral is this right?
More or less. Since you don't have a fixed reference to earth (or only a high-impedance connection) in an IT network the actual voltage will vary a bit.
BTW, it's 133 V these days, not 127 (127 is 220 V*sqrt(3) and 133=230*sqrt(3))
