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Draw the pic of a delta setup. You will see that between each phase is 240 V. With the high leg setup, all we've done is tap the center of the coil between A and C, giving us a neutral. We have not changed the relationship between each phase.

In other words, between any two phases, is one full transformer coil. Between B and N, there is a coil and a half. And the phase relation between the two sine waves is such that we get 208 V.

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Like 277 said, an open delta is just a regular single-phase set up with an additional transformer that's not center tapped. The 208 volts is a math equation. It's just a cheap way for the power company to deliver 3-phase power to it's customer but they are slowly but surely doing away with this set up.

Like 277 said, an open delta is just a regular single-phase set up with an additional transformer that's not center tapped. The 208 volts is a math equation. It's just a cheap way for the power company to deliver 3-phase power to it's customer but they are slowly but surely doing away with this set up.

I don't know what you would need 328 volts for but I was just curious as to why you don't get it.

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