C RURAL WIRE
BELL TELEPHONE LABS INC MURRAY HILL NJ
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C Rural Wire is intended principally for aerial distribution plant in rural exchange areas and was produced for use in locations where one or two pairs of open wire on brackets would otherwise be used. When C Rural Wire is installed in coastal areas, it offers greatly improved insulation resistance and resistance to corrosion. When used in wooded areas, the amount of tree trimming required will be greatly reduced as compared with that required for open wire. The wire has physical characteristics such that it can be used in spans of 350, 450 and 600 feet in heavy, medium, and light storm loading areas respectively, as recommended for standard 109H Steel Line Wire. Its electrical characteristics are such that, where carrier transmission is not anticipated, it can generally be used in exchange plant as though it were 19 gauge exchange cable or open wire. The wire consists of two parallel No. 14 AWG.064 inch 30 conductivity, extra high strength copper-steel conductors insulated with polyethylene. The polyethylene is an insulating grade compounded for outdoor use, of high molecular weight and with about 2-12 carbon black. The finished wire is flat-oval shaped with semi-circular edges and opposite flat parallel faces as illustrated in Fig. 1. A single ridge is molded in the insulation on one edge to provide conductor identification. The dimensions of the flat oval are approximately 0.15 inch x 0.28 inch on the minor and major axes respectively. The separation between conductor centers is approximately 0.140 inch. The thickness of insulation is 0.035 inch minimum.
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