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Voltage from a 240 volt source has 2 hot legs to ground. Leg to ground (netutral) voltage is 120 volts.

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If you are referring to the European system, then low-voltage distribution is a three-phase, four-wire system, with a line voltage (i.e. line to line) of 400 V and a phase voltage (i.e. line to neutral) of 230 V. A three-phase four-wire system comprises three line conductors and one neutral conductor.

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