Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
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Сторінка 33
... space , because the heated air and the hot vapours from the carbons are conductors to some ex- tent . The resistance for such a short distance is , however , so great , that an intense heat is produced and the carbon points and detached ...
... space , because the heated air and the hot vapours from the carbons are conductors to some ex- tent . The resistance for such a short distance is , however , so great , that an intense heat is produced and the carbon points and detached ...
Сторінка 39
... space out- side , the air , may be looked upon as one of the pipes , and the devices used to keep up the pressure on the system are keeping up a pressure between the pipes and the free space . Electricity cannot flow in this space and ...
... space out- side , the air , may be looked upon as one of the pipes , and the devices used to keep up the pressure on the system are keeping up a pressure between the pipes and the free space . Electricity cannot flow in this space and ...
Сторінка 68
... air - space that is an effectual insulator as far as the normal electrical pressure on the line is concerned . When a lightning charge accumu- lates on the line there is a very strong tendency 68 ELECTRIC WIRING .
... air - space that is an effectual insulator as far as the normal electrical pressure on the line is concerned . When a lightning charge accumu- lates on the line there is a very strong tendency 68 ELECTRIC WIRING .
Сторінка 69
... air - space is easily sparked across . The air is heated somewhat by the discharge , and the normal electrical pressure on the line is sufficient to maintain . a constant leakage to the earth if there is not some arrangement that breaks ...
... air - space is easily sparked across . The air is heated somewhat by the discharge , and the normal electrical pressure on the line is sufficient to maintain . a constant leakage to the earth if there is not some arrangement that breaks ...
Сторінка 70
Russell Robb. tricity in being forced through an air - space meets a high resistance , and the energy required to force the cur- rent through this resistance is transformed into intense light and heat . The heated air and volatilized sub ...
Russell Robb. tricity in being forced through an air - space meets a high resistance , and the energy required to force the cur- rent through this resistance is transformed into intense light and heat . The heated air and volatilized sub ...
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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.