Knob and Tube Wiring Knob-and-tube (also known as K&T) was commonly used in buildings in North America from about 1880 to the 1940s. This system is considered obsolete and can be a safety hazard. In knob-and-tube wiring, individually conducting wires protected by rubberized cloth fabric are installed in stud and joist cavities, held in place [...]
The knob and tube wiring system are also known as open wiring system. This wiring system came into existence when electricity and associated installations were allowed in domestic buildings. If you are planning to buy a house that was built before 1940, you have to get its inspection done before you make a decision. You [...]
Knob and tube wiring technique were one of the first standardized wiring systems. It was used before the 1940s and it used a single conductor usually insulated with a cloth fabric. Different types of porcelain insulators were used to separate the conductor from the wood in homes. Porcelain cylinders were inserted in holes to pass [...]
