Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . great deal of power plant wiring, nolead sheath is needed with varnished cambric insulation but the leadsheath is required for underground conduit work. W^hen rubber insulation is used, the conductors are tinned toprevent the action of any uncombined sulphur which may be presentin the vul
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . great deal of power plant wiring, nolead sheath is needed with varnished cambric insulation but the leadsheath is required for underground conduit work. W^hen rubber insulation is used, the conductors are tinned toprevent the action of any uncombined sulphur which may be presentin the vulcanized rubber. The Hooper process consists of usinga layer of pure rubber next to the conductors and using the vulcanizedrubber outside of this. One or two layers of pure rubber tape areput on spirally, the spiral being reversed for each layer. Rubbercompound in two or more layers is applied over this in the form oftwo strips which pass between rollers which fold these strips aroundthe core and press the edges together. Prepared rubber tape isapplied over this, after which the insulator is vulcanized and thecable tested. If satisfactory the external protection is apj>lied. Cable for polyphase work is made up of three conductors inone sheath, Fig. 50 shows a cross-section of cable manufactured for. -//VSUl AT/ON STffA/iD£D CONDl/CrOHFig. 50. Section of Polyphase Cable 91 82 POWER TRANSMISSION TABLE XTypical Cable Construction Cables Electric light less than 500 volts Arc lighting High-tension power transmis-sion No. of Conductors Single Single Single, concentric,duplex, or threeconductors [Character ofConductor Stranded SolidStranded Sizes of Individual Wires No. or smaller No. 6 or 4 B. & S. smaller Thickness of Insulation Rubber SaturatedFiber SatuiatedPaper DiyPaper Thicknessof Lead Electric light less than 500volts Arc lighting High-tension power transmission Inch. to 3% to A Inch. Inch. Inch. Inch. A to Jg A three-phase transmission at 6,600 volts.
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
