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Knob-and-tube wiring may also be damaged by building renovations. [11] Its cloth and rubber insulation can dry out and turn brittle. [ 10 ] It may also be damaged by rodents and careless activities such as hanging objects from wiring running in accessible areas like basements or attics.
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 certain situations, temperature rating can be higher than normal, such as for knob-and-tube wiring where two or more load-carrying wires are never likely to be in close proximity. A knob-and-tube installation uses wires suspended in air.
In the U.S., old electrical installations, such as knob-and-tube wiring or aluminum building wiring, ... Burleigh Grimes threw the last legal spitball in 1934.
Special wiring rules apply to wet or corrosive locations, [13] and to locations which present an explosion hazard. [14] Wiring materials for use in the United States must generally be made and tested to product standards set by NEMA and Underwriters Laboratories (UL) and must bear approval marks such as those set by UL.
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Copperweld Corp. v. Independence Tube Corp., 467 U.S. 752 (1984), is a major US antitrust law case decided by the Supreme Court concerning the Pittsburgh firm Copperweld Corporation and the Chicago firm Independence Tube. [1]
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