On Mon, 26 Jan 2015 14:49:43 +0100, Johnny Billquist wrote: This is Europe, remember... Normal mains are 230V, and 3-phase are 410V phase to phase. All the DEC equipment around here are designed to run on that stuff. Aehm, shouldn't it be 230 * SQRT(3) = 398 (rounded up to 400) or the other way 400 / SQRT(3) = 230 (slighty rounded down)? :) Actually, if I'm not wrong, 400 volts should be just a nominal standard voltage, and some European countries have different real voltages, but they would be still in range because of the allowed drift (something around plus/minus 6-10%). I think there is something about that in Wikipedia. Again: if I'm not wrong. :) Indeed here in Italy nominal household voltage was 220 volts up until few years ago, and it still is: just now I have a 219 volts reading at the outlet, and I live downtown in a quite big northern city (i.e. not countryside). In everyday speaking even electricians still refer to 3-phase 400 volt power as "three eighty" (lit. tre ottanta) i.e. the old 380 volt nominal voltage. :) HTH, G. P.S. I think that the UK may still be on 240/415 actual voltage even if they adhere to the European standards about the unified 230/400 delivery.