Electric Wiring for the Use of Architects, Underwriters, and the Owners of BuildingsMacmillan and Company, 1896 - 183 стор. |
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Сторінка
... given to the National Code of Rules for Electric Wiring because these rules furnish the standard in America for safe electrical construction . As a help to thorough comprehension it has been thought well to give the reason for each rule ...
... given to the National Code of Rules for Electric Wiring because these rules furnish the standard in America for safe electrical construction . As a help to thorough comprehension it has been thought well to give the reason for each rule ...
Сторінка 1
... given to one 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 ...
... given to one 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 ...
Сторінка 4
... given conditions can be defi- nitely foretold . Whatever electricity really is and whatever may ultimately be found true with regard to its nature , it is known that it acts very much as if it were a fluid , and all the actions of water ...
... given conditions can be defi- nitely foretold . Whatever electricity really is and whatever may ultimately be found true with regard to its nature , it is known that it acts very much as if it were a fluid , and all the actions of water ...
Сторінка 7
... given to ideas concerning it . This clothing of the ideas no doubt obscures many simple facts and fails to suggest their semblance to ideas that are familiar , but in the end it is an aid to clearness to have the terms distinctive ...
... given to ideas concerning it . This clothing of the ideas no doubt obscures many simple facts and fails to suggest their semblance to ideas that are familiar , but in the end it is an aid to clearness to have the terms distinctive ...
Сторінка 10
... given the names of the physicists who have done most for electrical science . Thus the unit of electro - motive force or elec- trical pressure , corresponding to " pounds per square inch " in hydraulics , is called the " volt , " and ...
... given the names of the physicists who have done most for electrical science . Thus the unit of electro - motive force or elec- trical pressure , corresponding to " pounds per square inch " in hydraulics , is called the " volt , " and ...
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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:—/'.