Knob and tube, often referred to by it’s acronym K&T, wiring was an early method of wiring that was in common use in the country from the 1880’s to the 1930’s. A single insulated copper conductor was run within wall or ceiling cavities and through joists via a protective porcelain insulating tubes. Porcelain knob insulators fastened by nails into the structure support the wire over it’s length.
This early form of residential wiring was intended only for lighting purposes and has quickly become outdated as the electrical requirements of a modern home have increased tremendously. The lack of a ground wire in the system is one of it’s drawbacks as well as it’s outdated method of insulation.
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