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Alternating Current ampere meter apparatus appliances approved arc lamps arc light armature attached automatic baseframe 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 distribution circuits double pole double-pole dynamo efficient electric light engines exciter fastened feeder fixture floor full load fuses fusible gas pipes globe ground heating incandescent lamps inches inclosed incombustible bases 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 ohms operation outlets pendants placed porcelain possible proper protected pulleys Rating ratus risers rules safety fuse 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 122 - 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 - When current for light and power is taken from primary or secondary batteries, the same general regulations must be observed as apply to similar apparatus fed from dynamo generators developing the same difference of potential.
Сторінка 137 - 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...
Сторінка 120 - All multiple arc low potential systems (300 volts or less) must be provided with an indicating or detecting device, readily attachable, to afford easy means of testing where the station operates continuously. c. Data obtained from all tests must be preserved for examination by insurance inspectors.
Сторінка 121 - Service blocks must be covered over their entire surface with at least two coats of waterproof paint. c. Must be at least seven feet above the highest point of flat roofs, and at least one foot above the ridge of pitched roofs over which they pass or to which they are attached.
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.