Electric Lighting Specifications for the Use of Engineers and ArchitectsW.J. Johnston Company, 1892 - 176 стор. |
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... Lightning Arresters Maximum Fall of Potential Note ALTERNATING CURRENT SYSTEM . PAGE . 96 97 97 97 97 98 98 98 99 66 STREET LIGHTING CIRCUITS - ARC OR INCANDESCENT . Note 99 Poles 99 Gains and Cross - arms 99 Steps 100 Suspension of ...
... Lightning Arresters Maximum Fall of Potential Note ALTERNATING CURRENT SYSTEM . PAGE . 96 97 97 97 97 98 98 98 99 66 STREET LIGHTING CIRCUITS - ARC OR INCANDESCENT . Note 99 Poles 99 Gains and Cross - arms 99 Steps 100 Suspension of ...
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... Lightning arresters . Ground detectors . Testing sets . [ Plug . Snap . Switch- Knife . boards ? Automatic . Single pole . Instru- ments . Breakdown . Switches . Double " Throwover . Three wire . Dynamo changing . Circuit changing ...
... Lightning arresters . Ground detectors . Testing sets . [ Plug . Snap . Switch- Knife . boards ? Automatic . Single pole . Instru- ments . Breakdown . Switches . Double " Throwover . Three wire . Dynamo changing . Circuit changing ...
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... - ground . Colored , etc. Arc . Nets . Number of circuits . Number of street lamps . Insulation . Poles . Cross arms . Pins and insulators . Steps . Line lightning arresters . Fall of potential . ELECTRIC LIGHTING SPECIFICATIONS . 31.
... - ground . Colored , etc. Arc . Nets . Number of circuits . Number of street lamps . Insulation . Poles . Cross arms . Pins and insulators . Steps . Line lightning arresters . Fall of potential . ELECTRIC LIGHTING SPECIFICATIONS . 31.
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... insulation from the ground maintained on both sides throughout the system , and lighting arresters of the most efficient type known . Switch- board . ( Note . In the case of compound dynamos 24. Cables to operating in parallel the ...
... insulation from the ground maintained on both sides throughout the system , and lighting arresters of the most efficient type known . Switch- board . ( Note . In the case of compound dynamos 24. Cables to operating in parallel the ...
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... lighting arresters . There shall also be provided one testing magneto capable of ringing through ohms . This contractor shall carry to the switch- board location at all regulator , exciter , auxiliary , and main wires , leaving the ends ...
... lighting arresters . There shall also be provided one testing magneto capable of ringing through ohms . This contractor shall carry to the switch- board location at all regulator , exciter , auxiliary , and main wires , leaving the ends ...
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Alternating Current ampère meter ance apparatus appliances approved arc lamps armature attached automatic baseframe bidder shall fill bids building c. p. lamps candle power capacity carried ceiling centre of distribution cleats concealed conductors connections contractor shall furnish covered cuits cut-outs and switches Direct Current double-pole electric light erect the following fastened fixture floor foundation(s full load fuses fusible Galvanometers globes hand regulator incandescent lamps inches inclosed incombustible bases installation insulated wire insulation resistance joints junction boxes knife switch lightning arresters Low Potential main wires ments metal moisture moisture-proof molding necessary non-combustible number of circuits number of lights number or designation operating dynamos operation outlets placed porcelain pressure proper protected pulleys purchaser Rating of exciters ratus and material riser feeder securely set screws shunt Sockets soldered spark arresters specification steam switchboard three-wire tightened tion tube two-wire voltage voltmeter volts walls waterproof wire smaller
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Сторінка 126 - 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 all pipes upon which condensed moisture is likely to gather, or which by leakage might cause trouble on a circuit.
Сторінка 127 - be covered with moisture-proof material. 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. Twin tube conductors must not be separated from each other by rubber or similar material, but by cotton or other readily
Сторінка 119 - between them, not less than a foot apart and not in contact with any substance other than proper insulating supports. 4. 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. must be
Сторінка 132 - where the cord comes through the ceiling block or rosette, in order that the strain may be taken from the joints and binding screws. All sockets used for wire or cord pendants should have openings at least equal to one-quarter inch
Сторінка 116 - in Isolated Plants, Connected With or Detached from Buildings Used for Other Purposes. Also to all Varieties of Apparatus, of both High and Low Potential. GENERATORS OR MOTORS—Must be : 1. Located in a dry place. 2. Insulated on floors or base frames, which must be kept filled to prevent absorption of moisture, and also kept clean and dry.
Сторінка 130 - handle. 4. Have carrying capacity sufficient to prevent heating above the surrounding atmosphere. 5. Be placed in dry accessible places, and be grouped as far as possible, being mounted, when practicable, upon slate or equally indestructible back boards.
Сторінка 132 - concealed between the pipe and shell of the fixture the insulation must be such as is required for fixture wiring for the electric light. 3. The whole installation must test free from "grounds." 4. The two installations must test perfectly free of connection with each other.
Сторінка 127 - be: 2. Placed at every point where a change is made in the size of wires (unless the cut-out in the larger wire will protect the smaller.)
Сторінка 164 - at every point where a change is made in the size of the wire (unless the cut-out in the larger wire is intended to protect the smaller).
Сторінка 129 - 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 safe carrying capacity of conductors of different sizes in Birmingham, Brown &