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
... tion of the Brown & Sharpe , or American wire gauge ; but this is quite different from the new standard British wire gauge , which is used in England . The American wire gauge will be employed in the present instance , since in this ...
... tion of the Brown & Sharpe , or American wire gauge ; but this is quite different from the new standard British wire gauge , which is used in England . The American wire gauge will be employed in the present instance , since in this ...
Сторінка 4
... tion , producing three objectionable effects . First , it causes a drop in voltage , so that the various lamps are not supplied with suf- ficient pressure or with the same pressure ; second , it involves a loss of energy and efficiency ...
... tion , producing three objectionable effects . First , it causes a drop in voltage , so that the various lamps are not supplied with suf- ficient pressure or with the same pressure ; second , it involves a loss of energy and efficiency ...
Сторінка 5
... tion , the cross - section doubling with each three numbers . Inter- mediate sizes may be approximated by interpolation ; for example , * Transactions , vol . x . , 1893 . one size larger has about 14 ( 1.261 ) times ELECTRICAL ...
... tion , the cross - section doubling with each three numbers . Inter- mediate sizes may be approximated by interpolation ; for example , * Transactions , vol . x . , 1893 . one size larger has about 14 ( 1.261 ) times ELECTRICAL ...
Сторінка 18
... shown in Fig . 1. In such cases the current is usually constant , hence the expression constant current is practically synonymous with series in electrical distribu- tion . The term high tension also applies , since 18 ELECTRIC LIGHTING .
... shown in Fig . 1. In such cases the current is usually constant , hence the expression constant current is practically synonymous with series in electrical distribu- tion . The term high tension also applies , since 18 ELECTRIC LIGHTING .
Сторінка 19
... tion . The term high tension also applies , since the voltage usually employed is high , being equal to the sum of the pressures con- sumed in all of the lamps on the circuit . For example , sixty lamps are commonly placed upon a single ...
... tion . The term high tension also applies , since the voltage usually employed is high , being equal to the sum of the pressures con- sumed in all of the lamps on the circuit . For example , sixty lamps are commonly placed upon a single ...
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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
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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.