"With B-B transformers you're never going to be right on the voltage."
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We get calls from office supply companies, all the time, they shop around calling every contractor in the book, looking for 208V for copy machines, what usually happens is the BB set up is uaually cheaper, and they always catch an EC that bids low, thinking he can use BB for this application, problem is, when they call, and say their $12,000 copy machine burned-up, they come to you, might be best to use a better transformer set-up and be sure.