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How can a three (3) phase transformer be converted to a single phase application?

Converting a three phase transformer to a single phase application can be done only under very specific circumstances. In general, this is NOT recommended.

Eaton Electrical's standard 3 phase transformers are set up in a Delta-Wye configuration.

Leaving off or disconnecting one or two of the phases and using the output as a single phase is not recommended due to heating affects on the core. This will unbalance the transformer.