knob and tube wiring

knob and tube wiring is an electrical wiring system with 2 wires spaced atleast 1 foot a part from etchother with ceramic knob and tube insulators knob and tube wiring was used in houses and buildings in the early days of electricity before sheaved cable was invented and is still in use in a lot of older buildings

my cousins old house has knob and tube wiring still in use and working after over a century wow