A single-phase power source with two hots and a neutral conductor is not the same situation as using two of the three phases of a four-wire wye and the neutral to operate a single-phase load.

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In a single-phase power source with two hots and a neutral conductor, the voltage between any hot and the neutral is the same. However, in a four-wire wye system, the voltage between any two phases is higher than the voltage between a phase and the neutral. Therefore, using two of the three phases and the neutral to operate a single-phase load will result in a different voltage level than using a single-phase power source with two hots and a neutral conductor.

A Single-Phase Power Source with Two Hots and a Neutral