How old is this roof top unit... Seriously 440 volts ? Are you sure
that it isn't 480 volts ?

CY: The unit looks maybe ten years old. It may well been 480, and I
typed it wong.

I asked the _age_ of the unit because there is supposed to be
a service outlet for 120 volt powered tools for maintaining the
roof top equipment installed somewhere near the unit...

CY: Actually, this one did have a convenience outlet. But,t hat gets
me thinking.

And no, with a 3 phase 480 volt system it is typically 277 volts
on each leg...

CY: Thanks.

~~ Evan