2012, ISBN: 1236224302

[EAN: 9781236224309], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****. This historic book may have numerous typos and missing… More...

[EAN: 9781236224309], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****. This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: . they are not applied to the general transmission of energy. Of these three, the two latter are the most important, iron or steel being used to a considerable extent only in the construction of telephone and telegraph lines, and even here they are rapidly giving way to copper. Steel may be used in some special cases, such as extremely long spans in overhead construction or for the working conductors for railway installations using a third rail. Phosphor bronze has a limited use on account of its mechanical strength. Copper and aluminum are used in the commercially pure state and are selected on account of their conductivity and comparatively low cost. The use of aluminum is at present limited to long-distance transmission lines or to large bus-bars, and is selected on account of its being much lighter than copper. It is not used for insulated conductors because of its comparatively large cross-section and consequent increase in amount of insulation necessary. TABLE I. Copper Wire Table. Resistance. The resistance of electrical conductors is expressed by the formula: R =-/ A J where R = total resistance of the conductors considered. Ij = length of the conductors in the units chosen. A = area of the conductors in the units chosen. / = a constant depending on the material used and on the units selected. For cylindrical conductors, L is usually expressed in feet and A in circular mils. By a circular mil is meant the area of a circle.001 inches in diameter. A square mil is the area of a square whose sides measure.001 inches and is equivalent to 1.27 circular mils. Cylindrical conductors are designated by gauge number or by their diameter. The Brown Sharpe (B. S.) or American wire gauge is used almost universally and the diameters correspond.<

2012, ISBN: 1236224302

[EAN: 9781236224309], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****.This historic book may have numerous typos and missing … More...

[EAN: 9781236224309], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: . they are not applied to the general transmission of energy. Of these three, the two latter are the most important, iron or steel being used to a considerable extent only in the construction of telephone and telegraph lines, and even here they are rapidly giving way to copper. Steel may be used in some special cases, such as extremely long spans in overhead construction or for the working conductors for railway installations using a third rail. Phosphor bronze has a limited use on account of its mechanical strength. Copper and aluminum are used in the commercially pure state and are selected on account of their conductivity and comparatively low cost. The use of aluminum is at present limited to long-distance transmission lines or to large bus-bars, and is selected on account of its being much lighter than copper. It is not used for insulated conductors because of its comparatively large cross-section and consequent increase in amount of insulation necessary. TABLE I. Copper Wire Table. Resistance. The resistance of electrical conductors is expressed by the formula: R =-/ A J where R = total resistance of the conductors considered. Ij = length of the conductors in the units chosen. A = area of the conductors in the units chosen. / = a constant depending on the material used and on the units selected. For cylindrical conductors, L is usually expressed in feet and A in circular mils. By a circular mil is meant the area of a circle.001 inches in diameter. A square mil is the area of a square whose sides measure.001 inches and is equivalent to 1.27 circular mils. Cylindrical conductors are designated by gauge number or by their diameter. The Brown Sharpe (B. S.) or American wire gauge is used almost universally and the diameters correspond.<

ISBN: 9781236224309

Paperback, [PU: Rarebooksclub.com], Technology: General Issues