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 2
... inch . may be given . Unfortunately the practice of using wire gauges has existed from time immemorial , and results ... inch . That is to say , a wire 100 mils in diameter is one hundred one thousandths , or one tenth of an inch , in ...
... inch . may be given . Unfortunately the practice of using wire gauges has existed from time immemorial , and results ... inch . That is to say , a wire 100 mils in diameter is one hundred one thousandths , or one tenth of an inch , in ...
Сторінка 3
... inch . Materials for Electrical Conductors . Copper is the material employed almost universally for electrical conductors , on account of its high conductivity . The slight superiority of silver in this respect is more than offset by ...
... inch . Materials for Electrical Conductors . Copper is the material employed almost universally for electrical conductors , on account of its high conductivity . The slight superiority of silver in this respect is more than offset by ...
Сторінка 4
... inch for soft copper , and 50,000 to 70,000 for hard - drawn , the lower figure being for large sizes ( Nos . 0000 and 000 ) and the higher value for small sizes of wire ( Nos . 14 and 16 ) . Electrical Resistance . In electrical ...
... inch for soft copper , and 50,000 to 70,000 for hard - drawn , the lower figure being for large sizes ( Nos . 0000 and 000 ) and the higher value for small sizes of wire ( Nos . 14 and 16 ) . Electrical Resistance . In electrical ...
Сторінка 5
... inch in diameter ( .1019 ) , has 1 ohm resistance at 20 degrees C. ( 68 degrees Fahr . ) , and weighs 31.4 pounds . A wire three sizes larger , that is , No. 7 , has almost exactly twice the cross - section and weight per thousand feet ...
... inch in diameter ( .1019 ) , has 1 ohm resistance at 20 degrees C. ( 68 degrees Fahr . ) , and weighs 31.4 pounds . A wire three sizes larger , that is , No. 7 , has almost exactly twice the cross - section and weight per thousand feet ...
Сторінка 8
... Inches . Circular mils . @ 20 ° C. @ 50 ° C. @ 80 ° C. @ 20 ° C. @ 50 ° C. @ 80 ° C. @ 20 ° C. @ 50 ° C. @ 80 ° C. 0000 ... inch , the nearest fourth significant digit being retained in the areas and diameters so deduced . It is to be ...
... Inches . Circular mils . @ 20 ° C. @ 50 ° C. @ 80 ° C. @ 20 ° C. @ 50 ° C. @ 80 ° C. @ 20 ° C. @ 50 ° C. @ 80 ° C. 0000 ... inch , the nearest fourth significant digit being retained in the areas and diameters so deduced . It is to be ...
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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.