three phase

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I have a very unique question. I have a three bank three phase incoming power supply in a delta configuration 240v. Is there any way to reconnect the taps that would result in a 208v phase to phase without changing to a Y config? The reason I ask is We had 208 for years the power company comes in one weekend puts a residential service down the street reconnects our plant and we now have 240. They say nothing was changed but it's obvious from the output of our step up transformers inside the plant that it was. Any ideas would be greatly appreciated!:grin: :grin:
 
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