Electric Wiring for the Use of Architects, Underwriters, and the Owners of Buildings

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Macmillan and Company, 1896 - 183 стор.
 

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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:—/'.

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