
Knob-and-tube wiring
Old knob-and-tube wiring runs through porcelain tubes in the framing, with cloth-covered single wires. More runs on porcelain knobs feed old porcelain light holders.
This wiring has no ground, and its insulation gets brittle with age. I couldn’t tell on a visual walk which runs still carry power.
Hire a licensed electrician to find out which runs are still in use and replace them.
Sample report









