On 4/7/06, Howard Winter wrote: > Alan, > > On Tue, 4 Apr 2006 11:18:38 +0100, Alan B. Pearce wrote: > > > Might be 415 (230V per phase). But that difference shouldn't be a worry. > > I always thought our 3-phase mains was at 440V (when 1-phase was 240V) - how do you get from one to t'other? > > (Bearing in mind our system is Wye-wired, with Neutral in the middle, and 230V (now, nominally) from Neutral > to each phase). Howard, this system ( 4 wires) is used only for low voltage distribution on 0.4KV and not just in England but worldwide. The load could use neutral or not depends on the wiring scheme, it has a tipical definition as star load or triangle load. So also the transformer could be a triagle-triagle, triagle-star or star-star (there are many more wiring schemes except those most common ) greetings, Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist