Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
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Сторінка 20
... tion . " Thus the result is twice as great if there be half the opposition or only half as great if there be one- half the effort . This general law is easily applied to electric circuits because of the independence of the factors . The ...
... tion . " Thus the result is twice as great if there be half the opposition or only half as great if there be one- half the effort . This general law is easily applied to electric circuits because of the independence of the factors . The ...
Сторінка 31
... tion , that if one wheel be shut off by closing a valve in the pipe above it , all the wheels will stop , for the continuity of the circuit will then be broken . If one wished to stop one of the water - wheels , it would be necessary ...
... tion , that if one wheel be shut off by closing a valve in the pipe above it , all the wheels will stop , for the continuity of the circuit will then be broken . If one wished to stop one of the water - wheels , it would be necessary ...
Сторінка 38
... tion to make it exact . With two paths more current will go through the path of low resistance than through the path of high resistance , but the total current will divide in exact inverse proportion . In Figure 5 , a large pipe may be ...
... tion to make it exact . With two paths more current will go through the path of low resistance than through the path of high resistance , but the total current will divide in exact inverse proportion . In Figure 5 , a large pipe may be ...
Сторінка 43
... send the same strength of current for the lamp between c and d , from its positive side out through the wire d . The result of the tendencies is a neutraliza- с tion . The current flows out on e through the THREE - WIRE SYSTEM . 43.
... send the same strength of current for the lamp between c and d , from its positive side out through the wire d . The result of the tendencies is a neutraliza- с tion . The current flows out on e through the THREE - WIRE SYSTEM . 43.
Сторінка 44
Russell Robb. tion . The current flows out on e through the two lamps back to c , just as it would if the wire d were not there at all and the two lamps were in series on a 220- volt circuit ; but , since the wire is there , if anything ...
Russell Robb. tion . The current flows out on e through the two lamps back to c , just as it would if the wire d were not there at all and the two lamps were in series on a 220- volt circuit ; but , since the wire is there , if anything ...
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Electric Wiring for the Use of Architects, Underwriters, and the Owners of ... Russell Robb Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
air-space alternating currents ampères approved arc lamp attached batteries become break building burn by-path carbons carrying capacity cause combustible material concealed conductors conduit connection construction copper copper wire cross-connection cuit current passes damp danger devices double-pole ductors dynamo earth elec electric circuit electrical pressure electro-motive force energy excessive current exposed fastened fire fixture floor flow fuse fusible cut-out gas-pipe glass or porcelain globe ground hanger-board heat high-potential incandescent lamps inch inflammable inflammable material Inigo Jones installed insulating covering Insulating-joints leak leakage liable light lightning-arrester low-potential mains melt metal moisture motor multiple system multiple-series necessary neutral wire Ohm's law operated path pipe placed possible potential prevent protected resistance-box rheostat Rule 18 Section series circuit service-switch short circuit shown in Figure socket soldered space switch switch-board temperature tion transformer trical tube underwriters volts W. J. LOFTIE walls waterproof wires leading
Популярні уривки
Сторінка 127 - Definitions). b. Must be placed at every point where a change is made in the size of the wire (unless the cut-out in the larger wire will protect the smaller).
Сторінка 140 - No combination fixture in which the conductors are concealed in a space less than one-fourth inch between the inside pipe and the outside casing, will be approved. h. Each fixture must be tested for "contacts...
Сторінка 64 - Special attention is called to the fact that switchboards should not be built down to the floor, nor up to the ceiling, but a space of at least ten or twelve inches should be left between the floor and the board, and from eighteen to twenty-four inches between the ceiling and the board, in order to prevent fire from communicating from the switchboard to the floor or ceiling and also to prevent the forming of a partially concealed space very...
Сторінка 121 - ... b. Must not be placed in the immediate vicinity of easily ignitible stuff or where exposed to inflammable gases or dust or to flyings of combustible material.
Сторінка 112 - 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.
Сторінка 123 - Must not be of such material or construction that the insulation of the conductor will ultimately be injured or destroyed by the elements of the composition. c. Must be first installed as a complete conduit system, without conductors, strings, or anything for the purpose of drawing in the conductors, and the conductors then to be pushed or fished in. The conductors must not be placed in position until all mechanical work on the building has been, as far as possible, completed. d. Must not be so placed...
Сторінка 162 - Must be capable of being disconnected at the power plant, or of being divided into sections, so that in case of fire on the railway route, the current may be shut off from the particular section and not interfere with the work of the firemen. This rule also applies to feeders.
Сторінка 112 - Must be so spliced or joined as to be both mechanically and electrically secure without solder. The joints must then be soldered, to insure preservation, and covered with an insulation equal to that on the conductors.
Сторінка 139 - Must be entirely made of material that will resist the action of illuminating gases and will not give way or soften under the heat of an ordinary gas flame or leak under a moderate pressure.