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system, the unbalanced loads can cause variations in the voltages on the 3-phase wires.
**Delta - A delta or phase-to-phase transformer is used on a delta distribution circuit. A single-phase delta transformer has two bushings connected to two of the three primary wires, so the primary winding sees the phase-to-phase voltage; this avoids returning primary current through a neutral that must be solidly grounded to keep its voltage near earth's potential. Since the neutral is also provided to customers, this is a significant safety advantage

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