24 Feb
2003
24 Feb
'03
8:30 p.m.
Errr.... 220V comes in single phase and three phase
flavors. While I
believe 2 phase power does exist, it's somewhat esoteric-- I've never even
*heard* of one, let along seen one.
There once was two phase - four wires with the phases 90 degrees apart -
but it is basically "gone"* now. A few big old Navy radio transmitters
from the 1920s used in for the motor-generators.
*It may still be held on in old factories. Remember, New York City *just*
discontinued DC power distribution!
William Donzelli
aw288(a)osfn.org