The neutral conductor is connected to ground at the transformer center tap. Two 120 V AC lines are supplied to the premises that are out of phase by 180 degrees with each other (when both measured with respect to the neutral), along with a common neutral. This system is common in North America for residential and light commercial applications. Its primary advantage is that, for a given capacity of a distribution system, it saves conductor material over a single-ended single-phase system, while only requiring a single phase on the supply side of the distribution transformer. It is the alternating current (AC) equivalent of the original Edison Machine Works three-wire direct-current system. On the three secondary terminals, the center tap is grounded with a short strap to the transformer case.Ī split-phase or single-phase three-wire system is a type of single-phase electric power distribution. ![]() Pole-mounted single-phase transformer with three-wire center-tapped "split-phase" secondary.
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