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 > _I want to convert the power from the wall from 208V triple-phase to 208V_ single-phase before feeding that single-phase into the transformer I got._


Try this using a 1:1, 208 volts isolation transformer: -

![Image alt text](https://electrical.codidact.com/uploads/Gojw8QJUNVHyMhuyQXism1DY)

Or get an isolation transformer that directly delivers 230 V AC on the output from a 208 V AC input.