Typically in the USA, there's 3-4 houses per transformer, but depending on the layout of houses, it can be from 1-6. Still a lot less than a big apt. complex. I

Typically in the USA, there's 3-4 houses per transformer, but depending on the layout of houses, it can be from 1-6. Still a lot less than a big apt. complex. I know X-10 can pass up and down through a shared transformer. Luckily, the customers, two sisters, wanted that.