Goodsounds wrote: > "In the US, real three phase is only in industrial systems" > > Well, this is ok but a bit misleading. Most (maybe all?) US electical > distribution is 3 phases from the power plant. Look at transmission > towers, normally you see the distribution wires in sets of 3. Most > residential neighborhood distribution is two phases only. But this is > still "real three phase" electricity distibution, to use your words, > but often just two phases in a given neighborhood. Sometimes all three > phases lead into an area, and then the phases are paired in the > different combinations for sub-areas, again for load balancing.
If its owned and covered by the Power company, sounds industrial to me. More precisely, I've never seen a US residential setup with three phase. Once you head into the homeowner's land, its not three phase. What it is out on the power pole before the step down transformers is pure "thar be dragons" for me. Someone up thread said that US domestic is not really two phase, its one phase split, 120V per leg. I've heard this same distinction made by Power EE's. I know that in a three phase system, there are three signals that are pi/3 out of phase. In the domestic setting, there is no phase shift at all. But for me, this is academic. I just hire a professional electrician to do this stuff. -- Pat Farrell http://www.pfarrell.com/ _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
