Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
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Сторінка 1
... branch of work , if there is to be any advancement . Yet it seems quite as true that there has never been a time when one must have so broad a knowledge . The development on all lines has been so great , and , in all branches of ...
... branch of work , if there is to be any advancement . Yet it seems quite as true that there has never been a time when one must have so broad a knowledge . The development on all lines has been so great , and , in all branches of ...
Сторінка 18
... branch of a line requires a separate calculation , for there are different volumes of current in each branch , and the lamps are at different dis- tances . It is at this point that rule - of - thumb methods fail , and some degree of ...
... branch of a line requires a separate calculation , for there are different volumes of current in each branch , and the lamps are at different dis- tances . It is at this point that rule - of - thumb methods fail , and some degree of ...
Сторінка 25
... branches and the positions of the lamps , and experience assists one to see quickly what will probably be the best arrangement ; but the loss may always be found by an application of Ohm's law , and even with experience one must in the ...
... branches and the positions of the lamps , and experience assists one to see quickly what will probably be the best arrangement ; but the loss may always be found by an application of Ohm's law , and even with experience one must in the ...
Сторінка 26
... branches . In a large building there is opportunity for a good grade of engineering skill and to have this work done by any one except those who have studied this branch of engineer- ing and who are familiar with the requirements , is ...
... branches . In a large building there is opportunity for a good grade of engineering skill and to have this work done by any one except those who have studied this branch of engineer- ing and who are familiar with the requirements , is ...
Сторінка 39
... branches , and from the branches , taps , just as in a water or gas system branches or taps are taken from the main pipes . The dynamo is maintaining a pressure between the wires . that lead from its terminals , and any branches that ...
... branches , and from the branches , taps , just as in a water or gas system branches or taps are taken from the main pipes . The dynamo is maintaining a pressure between the wires . that lead from its terminals , and any branches that ...
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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
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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:—/'.