What is a 240 volt 3 phase 3 wire grounded b phase system?

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A 240 volt 3 phase 3 wire grounded B phase system is also called a quadraplex configuration. You actually have four conductors, not counting the protective earth ground, which makes five wires. Three conductors are the individual phase hots, A, B, and C. You can use them delta only, and you will have 240 volt three phase. The fourth conductor is neutral, and is connected to the center tap of one of the transformers, and also grounded at the distribution point. You then have 120/240 volt split phase with that neutral and the two hots surrounding it, which is the normal residential configuration for the US. You cannot connect a three phase load in wye configuration, because the neutral is not in the center of the power triangle. If you want a wye configuration, you will need three more transformers, with the primaries delta and the secondaries wye.
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