Pole and Tower Lines for Electric Power TransmissionMcGraw-Hill, 1916 - 272 halaman |
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Istilah dan frasa umum
38 Galv aluminum angle assumed attachment bending bracing broken wires butt cable cement circuits clamps clearance coat compression members concrete poles conductors connection considerable copper corners corrosion cost creosote crossarms crossing span dead load dead-end diameter elastic limit electrical exceeding excess factor of safety failure foundation Gage Mat galvanized greater ground wire guys hard-drawn holes installation less line construction long spans main legs material maximum metal miles per hour obtained overhead paint pin insulators pole lines poles and towers poles or towers power wires protection radius of gyration reinforcement right-of-way shear sleet Span in Feet specifications spelter square foot square inch standard steel poles strain insulators stranded stringing supports surface Susp thickness timber tion TOWER LINES transmission line ultimate strength unit stress velocity volts weight wind loads wind pressure wood poles wooden poles
Bagian yang populer
Halaman 103 - Material which is to be used without annealing or further treatment shall be tested in the condition in which it comes from the rolls.
Halaman 187 - As soon as the stronger solution is taken from the vessel containing the unfiltered neutralized stock solution, additional crystals and water must be added to the stock solution. An excess of cupric oxide shall always be kept in the unfiltered stock solution.
Halaman 103 - Two test pieces shall be taken from each melt or blow of finished material, one for tension and one for bending; but in case either test develops flaws, or the tensile test piece breaks outside of the middle third of its gauged length, it may be discarded and another test piece substituted therefor.
Halaman 104 - The variation in cross-section or weight of more than 2\ per cent from that specified will be sufficient cause for rejection, except in the case of sheared plates, which will be covered by the following permissible variations...
Halaman 250 - ... to the supporting structures, in case of shattered insulators, or wires broken or burned at an insulator, without allowing an amount of slip which would materially...
Halaman 253 - Conductors: The conductors shall be of copper, aluminum, or other non-corrodible material, except that in exceptionally long spans, where the required mechanical strength cannot be obtained with the above materials, galvanized or copper-covered steel strand may be used.
Halaman 187 - The presence of an excess of cupric oxide will be shown by the sediment of this reagent at the bottom of the containing vessel. The neutralized solution shall be filtered before using by passing through filter paper. The filtered solution shall have a specific gravity of 1.186 at 65° F.
Halaman 187 - ... 36 parts, by weight, of crystals to 100 parts, by weight, of water. The solution shall be neutralized by the addition of an excess of chemically pure cupric oxide (CuO). The presence of an excess of cupric oxide will be shown by the sediment of this reagent at the bottom of the containing vessel.
Halaman 252 - The pole, or towers, shall be designed to withstand, with the designated factor of safety, the combined stresses from their own weight, the wind pressure on the pole, or tower, and the above wire loading on the crossing span and the next adjoining span on each side. The wind pressure on the poles, or towers, shall be assumed at 13 Ib. per square foot on the projected area of solid or closed structures and lV2 times the projected area of latticed structures.
Halaman 84 - Butt" measurement being the circumference six feet (6' 0") from the butt. 17. SPECIFICATIONS FOR EASTERN WHITE CEDAR POLES.* The material desired under these specifications consists of poles of the best quality of either seasoned or live green cedar of the dimensions hereinafter specified. Seasoned poles shall have preference over green poles provided they have not been held for seasoning long enough to have developed any of the timber defects hereinafter referred to. All poles shall be reasonably...