Thanks Dan. That helps a lot. Looks like a motor would be near the peak of the voltage at all times with 220/3 phase, vs half the time with 110 single phase. So Red & Green wires are both hot, but in 110 you only use the black, plus neutral. So, does a 220 motor have separate windings for each hot line?
Green isn't a conductor,Tom. Here, in N.America, it's always the ground wire, or in some cables it's bare copper...in theory it shouldn't actually be carrying any current.
single ph. 120V black & wht.
2 ph. blk red @ wht.
3 ph blk, red, blue & wht.
In 240V (220V) electric heating ccts. they use a cable with red and black conductors, no white neutral required. If it's Non-metallic sheathed cable (Loomex/Romex etc) the outer nylon sheath is red in colour so you know that's what the cable is being used for. In older wiring the cable is supposed to be identified with red marking every few feet.
If you have an electric HW tank, the cable could be #12 ga with the red outer covering, if it's maybe 15 yrs. or newer(?)...
"So, does a 220 motor have separate windings for each hot line?"
I think you're correct but I'm going to defer to anyone who actually works with this stuff...