The alternate name of Open Wiring suggests the importance that an open airspace be maintained around the wire at all times to prevent overheating.If the Knob & Tube Wiring system remains unaltered, has been carefully maintained, and all repairs have been made by a knowledgeable electrician, this wiring method would still be safe to use today. As the system ages and deteriorates, porcelain knobs and tubes may crack or break, old wires sag and fray, and the sheathing turns brittle and falls off, exposing the live wires.
Knob and tube wiring, also known as "k&t," was the common residential wiring method from the beginning of residential electric usage until the mid-twentieth century.Run the wire from the top of the wall, above each switch or outlet to the breaker panel. Attach the black wire of each cable to the front, or inside screw of a breaker.Bore through joists where necessary to keep the wires below floor level. Feed the new wire across the attic to the top of the wall over the breaker panel. Fit the wire into the hole and tighten the screw to fasten.Snap each breaker into an empty bay in the breaker box.Attach the black wire to the top screw of each outlet and the white wire to the bottom screw.