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The conduit methods were known to be of better quality, but cost significantly more than K&T. [2] In 1909, flexible armored cable cost about twice as much as K&T, and conduit cost about three times the price of K&T. [6] Knob and tube wiring persisted since it allowed owners to wire a building for electricity at lower cost.
Upgrading your wiring from outdated systems, like replacing knob and tube wiring, could even make your home eligible to insure with other carriers, giving you the opportunity to switch to a ...
2 Locating Knob and Tube. 2 comments. 3 First sentence- copied from elsewhere or vice-versa? 5 comments. 4 Requested move 8 February 2015. 4 comments.
Knob and tube wiring, 1880s–1930s, using asphalt-saturated cloth or later rubber insulation Armored cable, known by the genericized trademark "BX" - flexible steel sheath with two cloth-covered, rubber-insulated conductors [ 4 ] - introduced in 1906 but more expensive than open single conductors
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The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment in the United States. It is part of the National Fire Code series published by the National Fire Protection Association (NFPA), a private trade association . [ 1 ]
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