No, standard North American residential 240V power is not two-phase; it is single-phase. It is a common misconception to call it "two-phase" simply because it utilizes a double-pole breaker and two hot wires. In reality, North American residential service originates from a single phase of a high-voltage utility line stepped down by a pole transformer. That single phase is center-tapped to create two 120-volt legs that are 180 degrees out of phase with each other. True two-phase electrical systems (which utilized two alternating currents 90 degrees out of phase) are an obsolete historical technology largely phased out of modern power grids.
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