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US 220 Volt is split phase not 2 phase. Split phase is derived from a single phase with a centre-tapped transformer creating 2 hots - effectively +110 Volts and -110 Volts. Connect between and get 220 Volts.Re: IEC / Mennekes / J1772 / Eu mode / this weeks favourite
I stand corrected... I knew that the US stuff used two phases (to get the 220V) but forgot we had that option over here to get 440V (ish).
Taking 2 of 3 phases gives two waves a third of a cycle out of phase (120 degrees) whose voltage isn't the sum of the two contributors.