Now, if I can get really technical for a moment - Mike, you might remember this from your Electrical Engineering days.
You don't need a 15 kilowatt transformer to lower the line voltage to get around this problem. A transformer with a 12 volt 60 amp output could do the job theoretically. Wire the output in series with one side of the 240 volt line but opposing phase (symmetry is not needed) and you drop from 240 volts nominal to 228 volts. That should be a MUCH cheaper transformer. I'll post a schematic in a few days maybe but I doubt something like this would comply with the electrical code, so it is academic. Maybe try it on the 4th of July so that if it explodes, it would seem to be on purpose. Ha ha. Maybe I can find a picture of the cavalry with some explosions?