What is the earliest form of residential wiring known?

Knob-and-tube wiring is recognized as one of the earliest forms of residential electrical wiring. This system originated in the late 19th century and continued to be commonly used until the 1940s. Knob-and-tube wiring consists of insulated copper wire that runs through porcelain knobs and is supported on insulators. This method was utilized for its simplicity and effectiveness in safely distributing electricity throughout a home at that time.

The use of porcelain knobs and tubes allowed for the insulation of wires, preventing electrical shorts and promoting safety in a residential setting. It is noteworthy that while knob-and-tube wiring was revolutionary for its time, it has since been largely replaced by modern wiring methods due to advancements in safety standards and technology. Understanding the historical context and the characteristics of knob-and-tube wiring can give valuable insights into the evolution of electrical systems in residential buildings.