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 14
... conduit . In other words , the thermal resistance of the conduit and soil is added to that of the insulating covering . For underground conductors in iron pipe conduits laid in cement , the temperature elevation due to this cause would ...
... conduit . In other words , the thermal resistance of the conduit and soil is added to that of the insulating covering . For underground conductors in iron pipe conduits laid in cement , the temperature elevation due to this cause would ...
Сторінка 255
... is now regarded as commercially practicable . The electrical maintenance of such a circuit depends entirely upon. Method of making Loop Connection . Fig . 214. Wrought - Iron Pipe Conduit in Course. OVERHEAD CONDUCTORS . 255.
... is now regarded as commercially practicable . The electrical maintenance of such a circuit depends entirely upon. Method of making Loop Connection . Fig . 214. Wrought - Iron Pipe Conduit in Course. OVERHEAD CONDUCTORS . 255.
Сторінка 262
... conduit , and must be particularly strong in order to withstand the severe con- ditions to which it is exposed . In some instances , especially in Europe , iron - 262 ELECTRIC LIGHTING . CHAPTER XIII UNDERGROUND ELECTRICAL CONDUCTORS.
... conduit , and must be particularly strong in order to withstand the severe con- ditions to which it is exposed . In some instances , especially in Europe , iron - 262 ELECTRIC LIGHTING . CHAPTER XIII UNDERGROUND ELECTRICAL CONDUCTORS.
Сторінка 263
... conduit to protect them . The armor , which is relied upon for mechanical protection , consists of a spiral winding of iron or steel wire , like that of a submarine cable , or a spiral wrapping of iron or steel tape , with overlapping ...
... conduit to protect them . The armor , which is relied upon for mechanical protection , consists of a spiral winding of iron or steel wire , like that of a submarine cable , or a spiral wrapping of iron or steel tape , with overlapping ...
Сторінка 264
... conduit . They can be joined by screw or other con- nections which are most secure , and can also be made water - tight . Such a pipe can be bent to a reasonable extent without breaking or opening the joints ; whereas with almost any ...
... conduit . They can be joined by screw or other con- nections which are most secure , and can also be made water - tight . Such a pipe can be bent to a reasonable extent without breaking or opening the joints ; whereas with almost any ...
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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.