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In a horizontal or vertical cable rail, the cables, once tensioned must be rigid enough to prevent a 4-inch sphere passing through it. Factors influencing this rigidity are: the tension of the cable, intermediate posts (or cable spacers) spacing, the diameter of the cable, top rail cap material and the cable to cable spacing. [7]
A gooseneck contains a wire with a round cross-section inside, which is shaped like a spring in the shape of a helix.A wire with a triangular cross-section is wound around this, so that the tips of the triangle protrude between the round wires into the inner spiral. [1]
Lighter cable trays are more appropriate in situations where a great number of small cables are used, such as for telephone or computer network cables. These trays may be made of wire mesh, called "cable basket", [2] or be designed in the form of a single central spine (rail) with ribs to support the cable on either side.
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 ...
Neon lighting quickly became a popular fixture in outdoor advertising. The signs – dubbed "liquid fire" – were visible in daylight; people would stop and stare. [ 21 ] What may be the oldest surviving neon sign in the United States, still in use for its original purpose, is the sign "Theatre" (1929) at the Lake Worth Playhouse in Lake Worth ...
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.