Originally Posted By: rpalac
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I don't know where down in the city but along Delaware Avenue as far as 6 th &Chestnut they still have 2 phase 5 wire. That's an unusual animal that most people have no clew about. It was run at the turn of the century and they still haven't phased it all out.
Delta and Wye 3 phase services are common in my industry back ground. But like Joe said it is industrial or larger multi-family.
Delta transformation is used for heavy industrial manufacturing......something we sent to Japan Unfortunately. I still service it and it is still needed in some applications but most have been changed to wye connected transformers.