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Hi,
In Europe you are getting 50 Hz Power from the normal supply no matter if it is 3 phase 400V or single phase 230V.
Single phase power is normally one phase of the three phase supply and the neutral.
Previously the 3 Phase power here in Europe was 380V if you divide this by 1.732 ( the square root of 3 ) you get the sngle phase voltage. Inthis case 380/1.732 = 219.39 or what would normaly be called 220V Single phase.
400/1.732 = 230.94 or 230V Single phase and for the Australians and New Zealanders where the 3 Phase is normally 415/1.732 = 239.60 or what is commonly referd to as 240 Single phase
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Cheers,
K1W1
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