Monday, August 12, 2013


Knob and tube wiring
(Definition according to wikipedia)
Sometimes abbreviated K&T was an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s. 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 sleeving 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, then soldered and wrapped with rubber insulating tape and friction tape (asphalt saturated cloth), or made inside metal junction boxes.

Electrical fire at outlet caused by faulty K&T 

The main problem with knob and tube wiring is that you never know when it will become a hazard. We strongly urge homeowners to upgrade from knob and tube wiring if it is present in the home. As shown in the picture above this home is knob and tube wired and a outlet fire started as result of the outdated wiring, luckily the homeowner caught it in time and was not at a total loss. After a full evaluation of the homes electrical system and wiring, we found that the K&T wiring was faulty and needed to be replaced. Knob and Tube wiring has a cloth covering that begins to deteriorate over time once that covering is gone the live wires are exposed and can cause an electrical fire. K&T wiring is outdated and is no longer in use. 
If you need your homes knob and tube wiring evaluated for hazards please give us a call. we can have a licensed professional perform a K&T remediation and give you a full report along rewire plan if needed.

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