On Friday, February 3rd, 2012 at 13:46:53h +0000, Don Pearce asked:

Do the 120V and 240V system share the same high voltage distribution
lines?

The 240 V will come most probably from the use of two 120 V lines
which are 180 degrees out of phase.

(How come it is 120 V rather than 110 V? Higher rural voltage maybe?)