There are 3 basic types of 3-Phase Delta (240 VAC) ... Floating, Center Tap, and Corner Tap. Can any two legs of any type be used for a 240 VAC Split Phase Motor without effecting its performance? In particular, if the non-grounded two legs of a Delta Corner Tap are used, can this cause an unbalance of some sort and in particular effect the quality of the ground by inducing current in the ground? The reason for the question is that although the Phase to Phase voltage of all three are 240 VAC their phasor diagrams are much different. For example, the Center Tap Delta has two 120V Phases that are 180 degrees out of phase whereas the Corner Tap has two 240V Phases that are 60 degrees out of phase. So, even though a test meter displays a nice 240 VAC display, at instances in time the two phases (legs) of the Corner Tap are "fighting" each other.