The entire residential electrical grid in the USA uses 240v, split phase. One hot wire at 120v, one neutral at 0v, and one hot at -120v, out of phase with the o

The entire residential electrical grid in the USA uses 240v, split phase. One hot wire at 120v, one neutral at 0v, and one hot at -120v, out of phase with the other hot. Very rare to have anything else. It’s just that inside the building, the outlets/lights are connected to one side of the split phase connection or the other, giving you only 120v to work with. But then we have special outlets for electric clothes dryers, EV chargers, etc, which give you both hot connections in a single receptacle, for 240v.