I need to install a GFCI outlet in my kitchen, as there is currently none there. the existing wire looks like a 10/3 cable formerly from a range possibly? there is 4 wires(black, red, white, copper)
I want to know how to change from 240 volts to 120 volts without pulling new 14/2 wire.
I think I need to cap off either red or black, however, I want to make sure. any advice?