Between 1880 and 1930, knob & tube wiring, also known as K&T, was used extensively in residential building applications. It consists of single copper wires that run in walls and ceilings, passing through joist and stud holes by a means of a protective porcelain insulating tube and secured in long runs with porcelain insulators. Knob & tube became obsolete due to its high price tag in comparison to running an all-encompassing cable.
Is knob & tube wiring dangerous?
Knob & Tube wiring is not inherently dangerous as an installation. Where we experience the danger is in the following areas:
Due to its age, the insulation is typically brittle, broken, cracked and/or missing.
The system is typically added to over the years with dangerous wiring methods (a mix of old and new wire).
There is no ground. Thus, you cannot plug in any 3-prong cords.
It is often modified by do-it yourselfers, or unqualified technicians, resulting in poor connections.
It is often overlooked. K&T is designed to dissipate heat by being in free-air. It is often covered in insulation over the years, putting homes with it at risk of a fire.
How can I identify if I have knob & tube
You have duplex plugs with no ground or third prong.
You can see black single strand wires running through white porcelain insulators in your attic, crawlspace, or unfinished basement.
You live in a home built between 1880 and 1930 and have never had renovations.
Your insurance is making you pay a premium for having it in your home.
This is a potential fire spot and needs replacing.
Knob & tube wiring can effect your home.
Knob & tube connected to Romex is dangerous.
This old knob & tube junction box is a fire hazard.
If you have this in your home, call us immediately!
How do I fix knob & tube wiring?
Unfortunately, you need to completely remove the wiring, which can be a lengthy and expensive process. The good news is our team of highly trained electrical specialists are usually able to rewire your home without making much visible damage. We are partnered up with patching and painting companies to ensure that your home looks the way it did before we started. Call us today for an assessment and consultation about your Knob & Tube wiring.
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