Knob and Tube Wiring, also called Open wiring, was a common wiring method used in the early 1900’s to the late 1940’s. Knob & Tube Wiring is a single conductor, ungrounded system, where electricity is brought to different areas of the home by running copper wires, covered with a cloth and rubber insulation sheathing, through the walls, attic and floor spaces. Porcelain knobs are used to secure the wires in place and keep them from contacting combustible surfaces. Wherever the wire needs to cross through a stud or joist, holes are drilled and fitted with porcelain tubes through which the wire has been threaded, thus the name, Knob & Tube wiring.
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. Aside from deterioration as a result of age, the majority of problems with Knob and Tube Wiring are caused by tampering and when alterations are made to the original system.
Removing the old Knob & Tube wiring and replacing the entire system with new copper wiring to meet today’s Electrical Safety Code standards is the best solution. Call us for a Free Estimate.