Electric Lighting: A Practical Exposition of the Art, for the Use of Engineers, Students, and Others Interested in the Installation Or Operation of Electrical Plants, Том 2D. Van Nostrand Company, 1901 |
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Сторінка
... latter . The properties of conductors and various systems of electrical distribution , including direct current , as well as single and polyphase currents , occupy the first half of the book . Overhead and underground conductors are ...
... latter . The properties of conductors and various systems of electrical distribution , including direct current , as well as single and polyphase currents , occupy the first half of the book . Overhead and underground conductors are ...
Сторінка 4
... latter case , hard - drawn copper wire is generally employed , having a conductivity about 2 to 3 per cent less than that of annealed copper , and a tensile strength about twice as great . The latter is 25,000 to 35,000 lbs . per square ...
... latter case , hard - drawn copper wire is generally employed , having a conductivity about 2 to 3 per cent less than that of annealed copper , and a tensile strength about twice as great . The latter is 25,000 to 35,000 lbs . per square ...
Сторінка 5
... latter is easily deter- mined with accuracy by means of the ordinary screw micrometer . tance . A very simple and convenient rule to remember is the fact that 1,000 feet of No. 10 A. W. G. wire , which is practically one- tenth of an ...
... latter is easily deter- mined with accuracy by means of the ordinary screw micrometer . tance . A very simple and convenient rule to remember is the fact that 1,000 feet of No. 10 A. W. G. wire , which is practically one- tenth of an ...
Сторінка 7
... latter . The temperature coefficients for alloys are less than those of pure metals , being only about one- tenth as great for German silver as for copper . The resistance in ohms of a soft copper conductor at a given temperature in ...
... latter . The temperature coefficients for alloys are less than those of pure metals , being only about one- tenth as great for German silver as for copper . The resistance in ohms of a soft copper conductor at a given temperature in ...
Сторінка 14
... latter being kept at a constant temperature by the water . An underground conductor only differs from the foregoing in the fact that its sheathing may rise in temperature because heat is not taken from it rapidly enough by the ...
... latter being kept at a constant temperature by the water . An underground conductor only differs from the foregoing in the fact that its sheathing may rise in temperature because heat is not taken from it rapidly enough by the ...
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Electric Lighting: A Practical Exposition of the Art, for the Use of ... Francis Bacon Crocker Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
alternating current amperes apparatus arc lamps armature arrangement bulb bus bars cable candle-power capacity carbon cent circular mils conductors conduit connected constant current constant potential copper loss core cross-arm cross-section cut-out device diameter difference direct current distribution drop dynamo effect efficiency electric lighting electrical conductors employed energy equal fact feeders feeding-points filament flow frequency full load fuse globe ground heat hence incandescent lamps inch inclosed arc increase inductance insulation iron joint latter length less machines magnetic maximum mechanical metal meter method motor number of lamps ohms one-half open arc operation ordinary parallel phase pipe placed pole polyphase porcelain practically pressure primary produced reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit shown in Fig shunt side single-phase socket supplied switch temperature terminal three-phase three-wire system tion transformers tube two-phase two-wire two-wire circuit usually voltage volts wattmeter watts winding
Популярні уривки
Сторінка 460 - The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Сторінка 11 - W, we find that the most economical area of conductor is that for which the annual cost of energy wasted is equal to the annual interest on that portion of the capital outlay which can be considered to be proportional to the weight of metal used. Professor George Forbes, in his Cantor Lecture, on " The Distribution of Electricity...
Сторінка 459 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.