I have never heard of a US residence getting 3 phase electrical power but I guess it happens (the grow-lamp people or large apartments). Usually its 2 legs of the 3 phases. There is 3 phase coming in the neighborhood so your neighbors may be getting different phases than you. I guess you could run extension cords and experiment but I would not recommend it. Basically it is much more efficient for the power companies to transmit 3 phase (or six phase)electrical power than only a single phase.

MisterNice