On 11/07/2016 11:04 AM, et...@757.org wrote: > Hmmm it shouldn't be that hard in this day and age to come up with > that kind of current assuming switchers would be clean enough. I have > a home use LED video screen I assembled/am finishing from Chinese > modules that runs on 480 amps @ 5vdc, power supplies set me back > maybe $300 or less. Could probably adjust them down or get similar > units or higher quality stuff from surplus (Pioneer Magnetics, etc)
A lot depends on location. If you're out in a rural area and serviced by a Rural Electric Cooperative (REC), it's pretty easy, although there are the initial costs for the cable, distribution box and transformer. Farm equipment such as hay dryers tend to be 440V 3-phase, so it's not something out of the ordinary. Similarly, if you've got space in a commercial/industrial section of town, 3-phase power almost goes along without mention. Office buildings and warehouses tend to have 3-phase service. Of course, this is US practice. If you were, say, in Germany, 3-phase power is pretty standard for residential service--the only concern is the current-carrying capacity. But if you're a suburban resident living on Mulberry Street, anything but single-phase is pretty much out of the question. --Chuck
