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Star
With star the start of each of the three phases is connected together. Connections are taken from the ends of the three phases to give the three phases
Delta
With Delta the starts and ends of the phases are connected. The end of phase 1 is connected to the start of phase 2, the end of phase 2 to the start of phase 3, and the end of phase 3 to the start of phase 1. Connections are taken from the three start-end points to give the three phases.
