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 9
Сторінка 81
... Cross - connection . FIG . 27 . Cross - connection . A " cross - connection " might perhaps be quite as well termed simply a connection . Thus , in Figure 26 , if both wires are lying on the wet wood , A , there may be sufficient ...
... Cross - connection . FIG . 27 . Cross - connection . A " cross - connection " might perhaps be quite as well termed simply a connection . Thus , in Figure 26 , if both wires are lying on the wet wood , A , there may be sufficient ...
Сторінка 84
... cross this dry surface in order to reach the wooden pin on which the insulator is screwed , and this pin affords the only path to the earth . Figure 12 shows a " porcelain knob . " Dry porcelain is one of the best of insulators , but ...
... cross this dry surface in order to reach the wooden pin on which the insulator is screwed , and this pin affords the only path to the earth . Figure 12 shows a " porcelain knob . " Dry porcelain is one of the best of insulators , but ...
Сторінка 85
... cross - arm . There is also more liability of a connection between the two circuits on account of leakage through a wet cross - arm . Only low electrical pressures are required to operate telephone , telegraph , and similar circuits ...
... cross - arm . There is also more liability of a connection between the two circuits on account of leakage through a wet cross - arm . Only low electrical pressures are required to operate telephone , telegraph , and similar circuits ...
Сторінка 91
... connection , or by - path , directly across the two wires C and D , as in Figure 37. The current now divides , part still going through the lamps , but the greater part through the cross - connection E , because it offers less ...
... connection , or by - path , directly across the two wires C and D , as in Figure 37. The current now divides , part still going through the lamps , but the greater part through the cross - connection E , because it offers less ...
Сторінка 92
... cross - connection E is made , or , if when the lamps are to be turned on , the cross - connection is broken a little before the con- nections F , F , are made , then there will , of course , be arcing , which will introduce a danger ...
... cross - connection E is made , or , if when the lamps are to be turned on , the cross - connection is broken a little before the con- nections F , F , are made , then there will , of course , be arcing , which will introduce a danger ...
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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 copper wire cross-connection cuit current passes damp danger devices direct current 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 operated path pipe placed possible potential prevent protected resistance-box rheostat Rule 18 Section series circuits service-switch short circuit 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 67 - Must be placed on the switch board, or, if not thereon, at a distance of a foot from combustible material, or separated therefrom by a non-inflammable, non-absorptive, insulating material.
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 79 - VOLTS. Any circuit attached to any machine or combination of machines which develops a difference of potential, between any two wires, of over...
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 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 - ... 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 as to be subject to mechanical injury by saws, chisels, or nails.