Electric Lighting Specifications for the Use of Engineers and ArchitectsW.J. Johnston Company, 1892 - 176 pages |
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Common terms and phrases
Alternating Current ampère meter apparatus appliances approved arc lamps armature attached automatic baseframe belt bids brushes building c. p. lamps candle power capacity carried ceiling centre of distribution cleats concealed conductors conduit connections contractor shall furnish covered cross-arms cuits cut-out boxes cut-outs and switches device Direct Current double-pole efficient electric light engineer exciter fastened fixture floor full load fuses fusible gas pipes globe ground hand regulator incandescent lamps inches inclosed incombustible bases installation Instru insulated wire insulation joints junction boxes least lightning arresters Low Potential main wires ments metal moisture moisture-proof molding necessary non-combustible non-inflammable number of lights number or designation ohms operation outlets placed plant porcelain pressure proper protected pulleys purchaser Rating riser feeder schedule securely set screws shunt Sockets soldered spark arresters specification steam suita switchboard three-wire tightened tion tube two-wire voltmeter volts walls waterproof wire smaller
Popular passages
Page 130 - 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.
Page 137 - Transformers should not be placed inside of any buildings except central stations, and should not be attached to the outside walls of buildings, unless separated therefrom by substantial supports.
Page 116 - 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.
Page 136 - Must be so suspended that the entire weight of the socket and lamp will be borne by knots under the bushing in the socket, and above the point where the cord comes through the ceiling block or rosette, in order that the strain may be taken from the joints and binding screws.
Page 140 - 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.
Page 134 - ... b. Must always be placed in dry, accessible places, and be grouped as far as possible. Knife switches must be so placed that gravity will tend to open : rather than close the switch.
Page 116 - Must be so placed that moisture cannot form a cross connection between them, not less than a foot apart, and not in contact with any substance other than their insulating supports.
Page 131 - The object of a tube or conduit is to facilitate the insertion or extraction of the conductors to protect them from mechanical injury and, as far as possible, from moisture.
Page 135 - 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...
Page 168 - ... b. Must be placed at every point where a change is made in the size of wire [unless the cut-out in the larger wire will protect the smaller.