Sean Breheny wrote: > The advantages of using DC for such long distances is > reduced losses (due to capacitive coupling and EM radiation) and > relieving the need to synchronize phase (which is difficult to do > between two ends of a very long transmission line with a varying > load). And no skin effect. That means the conductors can be used more efficiently= .. As you say, DC is usually reserved for long distance transmission. The power feed from Hydro Quebec is 100s of miles long, and is DC. It ends at = a special power conversion station in Ayer, not far from my house. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .