Many people here know that their household voltage is 240, but that's often about as far as their knowledge goes!
By the way, I am right i thinking that the nominal official voltage is actually 117/234 volts? Do the utilities have a specified allowable tolerance? Ours is 6%. (To be more precise, it WAS 6%, but there's some changes going on at the moment. Explanations later, if wanted!)
#3618 - 08/24/0107:01 AMRe: 2-wire / 3-wire service
I have only had the opportunity to change out a few very old 120V services , mostly on neglected buildings. The meter bases & main disco's were usually small, fed K&T, and became 'desktop trinkets' for those who admired their oddity.
#3620 - 08/24/0107:47 AMRe: 2-wire / 3-wire service
Concerning 2W 120V services there are still quite a few here in Houston. Mostly in the oldest areas of the city. We even have some that are K&T and the tubes stick out of the wall with small #10AWG. There is no W/H just the tubes. These generally have "A base" type meters. Probably dates back to the 40's. Although these are still in existence, the cust is required to upgrade to current standards if any work to the meterloop is performed.
#3623 - 08/24/0105:35 PMRe: 2-wire / 3-wire service
The lowest rated service I still see fairly reglarly is 40A (at 240V only, remember). Most of the older 30A services seem to hve gone now,certainly in this area. New sevices are generally 80 to 100A, but there are still a lot of 60A about.