*As I recall on a delta connection one of the phases will have a higher
reading to ground than the other two. On a Y connection the reading to
ground will be the same. In NJ, Public Service Electric and Gas will not
permit that high leg to be installed in the same panel as the neutral.
The NEC allows it though.

What you are describing sounds to me like a 240V "star" system with high
leg, a variant of Y. Two of the phases are 240V center tap with the
center
tap connected to neutral. That provides four 120V legs. The third is
240V
with one end rather than the center tap of that transformer's winding
connected to neutral to provide the "high leg". It is possible to use
the
center tap of that to provide a fifth 120V leg.


*It's been a while since I have worked on three phase, but I seem to
recall on a three phase 240 volt delta system, the high (Orange) leg is
around 180 volts to ground. I only remember one phase as being center
tapped. Next time I meet with someone from the power company I will ask
them to refresh my memory.


*I was just looking in my PSE&G handbook and found a drawing for three phase
services. They supply 3 phase 4 wire 120/240 volt delta, 3 phase 4 wire
120/208 volt wye, 3 phase 4 wire 277/480 volt wye services and they also
list 3 phase 4 wire 265/460 volt wye but in parentheses they have
"Obsolete". I guess the 460 is being or has been phased out (No pun
intended). For the delta service they want the orange leg on the right
terminal in the meter and of course after that it must go on the center
terminal as per the NEC. As I mentioned before PSE&G wants the neutral in a
separate panel from the high leg, therefore two panels must be installed;
one single phase with neutral and one three phase without neutral. I think
JCP&L will accept the neutral and high leg together, but I would have to
double check.