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Why it is not 230V ×3, why only 440V?
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If 1-phase voltage is 220V, why is 3-phase 440V and not 660V? Electrical Interview Questions
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If single phase power is 220 volts, why is 3 phase 440 volts and not 660? - Quora
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phase - Transformer 220/380/440 V 24 V explanation - Electrical Engineering Stack Exchange
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