Here is a problem you may not know a lot about. But in case you've got it, then it is going to make selling your home a more expensive proposal. If you hire a home inspector, assessing for tube and knob wiring (K&T for short) is among the first things on any contractor's listing.
Here is what I will tell you about it. What's Knob-and-Tube Wiring? To begin with, allow me to inform you in shorthand what K&T is. It is made up of single-insulated aluminum conductors that operate inside the ceiling or wall cavities. These wires are guarded by ceramic insulated tubes or nailed-down ceramic knob insulators. Following is an image of exactly what it resembles. This protection is constructed from elastic fabric insulating sheeving. They are twisted together and soldered, wrapped with rubber insulating tape or asphalt-saturated fabric and occasionally set to metal junction boxes. Sound complex? It is not really. The one thing you really should bear in mind is that the U.S. Electrical Code no longer permits new knob-and-tube wiring to be installed. And to make it worse, generally, it is no longer even allowed to maintain your residence. tube and knob wiring has been commonly utilized in North America before the 1940's. Therefore, if you are selling an older home -- which Craftsman colonial you have lovingly restored -- you are bound to find it. Unless, obviously, you have upgraded the whole home, such as its innerds. What's Knob-and-Tube Wiring a Problem? K&T has a couple of difficulties. Knob-and-tube wiring has been used during a period when electrical requirements were less demanding. Fewer appliances, no more air-conditioning methods, no microwaves. K&T never comprised a security grounding conductor.