My first house had among other systems k&t. In the basement I ran a third wire with the runs to use grounded recepticals. BTW when I moved in the house had a a box with main and range fuses and four edison based fuses. Two of thoes went to a water heater and the whole rest of the house was on one and one was spare. Replaced with a 200A housepower panel and a new 42 main panel. I believe that CORRECTLY installed K&T is a very safe method -- just too much of it is basterdised. At that time [1971] found the K&T supplies at an old hardware store.
