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 2
D. Van Nostrand Company, 1901
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alternating current amount amperes apparatus applied armature arrangement cable candle-power capacity carbon carried cause cent circuit closed coil conductors conduit connected considerable considered consists constant construction copper core covering determined device difference direct current distribution drop dynamo effect efficiency electric employed energy equal example fact feeders field flow former frequency give given greater ground heat hence illustrated inch increase inductance insulation iron joint lamps latter length less light load loss machines magnetic material maximum means measured mechanical metal method motor ohms operation ordinary parallel phase pipe placed pole positive possible potential practically pressure primary produced rated reduced regulation represented resistance secondary separate shown in Fig side similar sufficient supplied switch temperature three-wire tion transformers tube usually varies various voltage volts watts winding wire
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.