"jk" wrote in message
...
"Edwin Lester" wrote:




Just double checked. My system show 480 phase to ground on two phases, and
0
on the third. All phases measure 480 phase to phase.


So then what you have is a corner grounded delta. Unusual, but not
unknown. It ias also possible you have an ungrounded delta, with a
ground fault on one leg. [Almost the same difference really]

jk

IIRC, my system is preferred for motor loads and other such high amp
equipment, and the 277 flavor was more useful if a LOT of 277v lighting was
required.