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How much voltage can a step-up transformer increase?

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Generally, yes. Most small single speed three-phase motors are wound for operation from either a 380/415v or a 220/240v 3-phase supply. A typical \u201cdual-voltage\u201d motor plate will indicate a voltage rating such as \u201cV 220-240 \u2206 / V 380-415 Y\u201d together with two current ratings.

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