Soares grounding book has a lot of info on theses systems &
how they must be installed as well as grounded. I've worked with them over the years . Most Utilitys wwhere I'm located well Not give you a high leg delta but well give you a ungrounded Delta. Its them up to if you ground one leg or leave it as a ungrounded system. (ground detector lights are then required per 2011 NEC (250.21 (B)).if you leave it ungrounded.
I was just wondering if around the country more are being installed??