Replace Knob & Tube Wiring in Salt Lake City, UT: Upgrade Your Home Safety
Knob and tube wiring is an early method of electrical wiring in certain buildings and was really common until the early 1940s. It consisted of single-insulated copper conductors run within wall or ceiling cavities, passing through joist and stud drill-holes via protective porcelain insulating tubes, and supported along their length on nailed-down porcelain knob insulators.
Where conductors entered a wiring device such as a lamp or switch or were pulled into a wall, they were protected by flexible cloth insulating sleeves called “loom.” The first insulation was asphalt-saturated cotton cloth, then rubber became common. Wire splices in such installations were twisted together for good mechanical strength, then soldered and wrapped with rubber insulating tape and friction tape (asphalt-saturated cloth) or made inside metal junction boxes.
Compared to modern electrical wiring standards, knob and tube wiring methods have several serious shortcomings. This wiring method never included a safety grounding conductor and allowed for splicing of wiring in walls without a junction box which are both not allowed in todays code.
Knob and tube rewiring must always be handled by certified and insured professionals. If you have one in your home or business and want a professional knob and tube wiring replacement in Salt Lake City, UT, call us today to get started.