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alternating currents ampère meter apparatus appliances approved arc lamps arc light armature attached automatic belt building c. p. lamps candle power 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 double-pole dynamo efficient electric light engines exciter fastened feeders fixture floor foundation(s full load fuses fusible gas pipes globe ground incandescent lamps inches inclosed incombustible bases insure joints junction boxes least lightning arresters Low Potential main wires material mechanical injury metal moisture-proof molding necessary non-combustible non-inflammable number of lights number or designation º º º ohms operation outlets pendants placed porcelain possible proper protected pulleys Rating ratus risers rules safety fuse schedule securely separated shunt socket soldered Spark arresters specification steam supported switchboard three-wire tion Trade number tube two-wire voltmeter volts walls waterproof insulation
Сторінка 128 - 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 114 - 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 134 - 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.
Сторінка 138 - 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 132 - ... 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.
Сторінка 114 - 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.
Сторінка 129 - 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.
Сторінка 133 - 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...