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Most single-phase systems are supplied from a three-phase pr

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Most single-phase systems are supplied from a three-phase primary.The primary of a single-phase transformer is connected to one phase of the three-phase system.The secondary contains two coils connected in series with a midpoint tap to provide a single-phase,three-wire system.This rangement is generally used to supply power to residential occupancies and some commercial establishments.A schematic diagram is shown in Fig.
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