Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
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Результати 1-5 із 48
Сторінка 22
... dynamo or other source of electricity is at A , and that the pressure at that point is 110 volts . 110 100 90 80 PRESSURE IN VOLTS 40 50 30 60 བྷ 70 30 30 20 10 Α 100 ' 200 ' 300 ' DISTANCE FROM DYNAMO IN FT . 400 ' 500 ' C FIG . 1 ...
... dynamo or other source of electricity is at A , and that the pressure at that point is 110 volts . 110 100 90 80 PRESSURE IN VOLTS 40 50 30 60 བྷ 70 30 30 20 10 Α 100 ' 200 ' 300 ' DISTANCE FROM DYNAMO IN FT . 400 ' 500 ' C FIG . 1 ...
Сторінка 23
... dynamo . Five hundred feet of this wire will have a resistance of almost exactly one - half ohm . The wire runs to ... dynamo of but 110 volts there will remain only 100 volts for forcing the current through the lamps to produce light ...
... dynamo . Five hundred feet of this wire will have a resistance of almost exactly one - half ohm . The wire runs to ... dynamo of but 110 volts there will remain only 100 volts for forcing the current through the lamps to produce light ...
Сторінка 24
... dynamo must be made to give 120 volts , so that there will still be 110 volts left at the lamps after the resistance of the line has caused a loss of 10. But the effect of raising the pressure at the dynamo can be realized by imagining ...
... dynamo must be made to give 120 volts , so that there will still be 110 volts left at the lamps after the resistance of the line has caused a loss of 10. But the effect of raising the pressure at the dynamo can be realized by imagining ...
Сторінка 25
... dynamo or at any intermediate point , a lamp would have practically the same pressure . It can be seen from the examination of this case how necessary it is for satisfactory service , that there be equality of pressure at all lamps at ...
... dynamo or at any intermediate point , a lamp would have practically the same pressure . It can be seen from the examination of this case how necessary it is for satisfactory service , that there be equality of pressure at all lamps at ...
Сторінка 26
... dynamo is of the best , and where the wiring is cal- culated for a very small loss , that they can be used . If the wires are so small that turning off a number of the lamps causes the pressure at those remaining to in- crease by ...
... dynamo is of the best , and where the wiring is cal- culated for a very small loss , that they can be used . If the wires are so small that turning off a number of the lamps causes the pressure at those remaining to in- crease by ...
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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 arc-light attached batteries become break building burn by-path carbons carrying capacity cause combustible material concealed conductors conduit connection construction 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 liability 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 135 - ... capacity of the wire is exceeded. 25. TABLE OF CAPACITY OF WIRES:— It must be clearly understood that the size of the fuse depends upon the size of the smallest conductor it protects, and not upon the amount of current to be used on the circuit. Below is a table showing the...
Сторінка 87 - 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 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 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.
Сторінка 114 - ... b. Must be so arranged that wires of opposite polarity, with a difference of potential of 150 volts or less, will be kept apart at least two and one-half inches, c. Must have the above distance increased proportionately where a higher voltage is used. d. Must not be laid in plaster, cement or similar finish, e. Must never be fastened with staples. IN UNFINISHED LOFTS, BETWEEN FLOORS AND CEILINGS, IN PARTITIONS AND OTHER CONCEALED PLACES:—/'.