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Knob-and-tube wiring (sometimes abbreviated K&T) is an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to ...
The Carter system, also known as the Chicago system, was a method of wiring three-way switches in the era of early knob-and-tube wiring. This now-obsolete wiring method has been prohibited by the USA National Electrical Code since 1923, [2] even in new knob-and-tube installations which are still permitted under certain circumstances. This ...
The earliest standardized method of wiring in buildings, in common use in North America from about 1880 to the 1930s, was knob and tube (K&T) wiring: single conductors were run through cavities between the structural members in walls and ceilings, with ceramic tubes forming protective channels through joists and ceramic knobs attached to the ...
A knob-and-tube installation uses wires suspended in air. This gives them a greater heat dissipation rating than standard three-wire NM-2 cable , which includes two tightly bundled load and return wires.
In the U.S., old electrical installations, such as knob-and-tube wiring or aluminum building wiring, are not required to be updated to follow the modern National Electrical Code unless significant changes are made to the circuit.
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