> In the US the ground wire is bonded to at least one copper rod that=20 > is driven into the ground on the outside of the house My NZ-registered nephew tells me that here they are considering or now earthing at the distribution transformer, and so each house will need an earth wire as well as the single-phase pair. Apparently "NZ earth is not good" Joe --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .