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The cable linking the telephone exchange to local customers is a thick cable lashed to a thin supporting cable, containing hundreds of twisted pair subscriber lines. Each twisted pair line provides a single telephone circuit or local loop to a customer.
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 ...
Bambach Wires & Cables: 12,000 1.1 References This page was last edited on 26 August 2023, at 04:58 (UTC). Text is available under the Creative Commons ...
The first rubber-insulated cables for US building wiring were introduced in 1922 with US patent 1458803, Burley, Harry & Rooney, Henry, "Insulated electric wire", issued 1923-06-12, assigned to Boston Insulated Wire and Cable . These were two or more solid copper electrical wires with rubber insulation, plus woven cotton cloth over each ...
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In the late 1980s, Anixter created a program called Levels to compare one brand of cable to the other. [13] By the 1990s, the Levels program became industry standard, and in 2003, Anixter sold the Levels program to Underwriters Laboratories. [14] [15] In 1989, Anixter crossed the $1 billion mark in sales. [16]
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