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First-generation wiring systems became susceptible to abuse by homeowners who would replace blown fuses with fuses rated for higher current. This overfusing of the circuits subjects wiring to higher levels of current and risks heat damage or fire. Knob-and-tube wiring may also be damaged by building renovations. [11]
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 ...
In both those instances the white wire should be identified as being hot, usually with black tape inside junction boxes. The neutral wire is identified by gray or white insulated wire, perhaps using stripes or markings. With lamp cord wire the ribbed wire is the neutral, and the smooth wire is the hot. NEC 2008 400.22(f) allows surface marking ...
Hot-wiring, a method of starting a car with no key; Hot-wire foam cutter, a tool used to cut foam and polystyrene; Hot wire (electricity), a wire conductor with non-zero potential in electric power distribution; Hot-wire anemometer, an electrical device for measuring the speed of airflow
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.
The wire leads from the tube were soldered into the pins, and the evacuation tip was protected inside the post. Matching plugs were also manufactured that let tube sockets be used as eight-pin electrical connectors; bases from discarded tubes could be salvaged for this purpose.
A bridgewire or bridge wire, also known as a hot bridge wire (HBW), is a relatively thin resistance wire used to set off a pyrotechnic composition serving as pyrotechnic initiator. By passing of electric current it is heated to a high temperature that starts the exothermic chemical reaction of the attached composition.