Thanks davidbeach. Although I have not personally inspected the distr. transformers, I highly doubt that any are YDY connected.
As for delay time, yes..the control allows a certain period of time during transfer. I think it is around 20-30 minutes.
There have been a series of "on-site" loss of phase situations at a large nursing home in Vermont. The nursing home operates on the load side of a utility owned primary meter. The configuration consists of a 3 phase system (12.5KV) that radially branchs off the main utility line, pass thru a...