Theoretical and Practical Electrical Engineering: Comprising a Course of Lectures Given at the Bliss Electrical School Upon the Principles and Applications of Both Direct and Alternating Current Apparatus, Том 1Bliss Electrical School, 1922 |
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Загальні терміни та фрази
acid air gap alternating current ammeter ampere-hours ampere-turns amperes angle armature armature current armature reaction armature winding battery booster brushes capacity cell centimeters charge circular mils coil commutating poles condenser conductors constant copper core counter e.m.f. cross-section curve deflection delivered DIRECT-CURRENT direction discharge drop effective e.m.f. electrical electro-magnet employed energy equal Explain field flux flow flux density galvanometer impedance impressed e.m.f. inches increased inductive e.m.f. instrument insulated iron kilowatts lamps lines of force load loss machine magnetic circuit magnetic field magnetic reactance magnetizing force magneto-motive-force maximum metal meter multiple needle obtained ohms operation output parallel phase plate polarity position potential power factor produce proportional result reverse rheostat SECTION segment series field series winding short-circuited shown in Fig shunt field shunt motor Sketch slot solution speed square sulphate surface switch three-phase tion torque voltage voltmeter volts wattmeter watts Wheatstone Bridge wire zero zinc
Популярні уривки
Сторінка 218 - In all wiring special attention must be paid to the mechanical execution of the work. Careful and neat running, connecting, soldering, taping of conductors, and securing and attaching of fittings, are specially conducive to security and efficiency, and will be strongly insisted on.
Сторінка 221 - Bushings must be long enough to bush the entire length of the hole in one continuous piece, or else the hole must first be bushed by a continuous waterproof tube.
Сторінка 48 - The total resistance of a parallel circuit is equal to the reciprocal of the sum of the reciprocals of the individual resistances of the circuit.
Сторінка 218 - The load should be divided as evenly as possible among the branches and all complicated and unnecessary wiring avoided. The use of wire-ways for rendering concealed wiring permanently accessible is most heartily endorsed and recommended; and this method of accessible concealed construction is advised for general use. Architects are urged, when drawing plans and specifications, to make provision for the channeling and pocketing of buildings for electric light or power wires, and in specifications...
Сторінка 221 - 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 218 - In laying out an installation, except for constant-current systems, every reasonable effort should be made to secure distribution centers located in easily accessible places, at which points the cut-outs and switches controlling the several branch circuits can be grouped for convenience and safety of operation. The load should be divided as evenly as possible among the branches, and all complicated and unnecessary wiring avoided.
Сторінка 218 - In all electric work conductors, however well insulated, should always be treated as bare, to the end that under no conditions, existing or likely to exist, can a grounding or short circuit occur, and so that all leakage from conductor to conductor, or between conductor and ground, may be reduced to the minimum.
Сторінка 218 - The National Electrical Code was originally drawn in 1897 as the result of the united efforts of the various Insurance, Electrical, Architectural and allied interests, which, through the National Conference on Standard Electrical Rules, composed of delegates from various National Associations, unanimously voted to recommend it to their respective associations for approval or adoption...
Сторінка 222 - Cut-outs such as circuit breakers and fuses should be placed on all service wires as near as possible to the point where they enter the building, on the inside of the walls, and arranged to cut off the entire current from the building.
Сторінка 225 - Must be continuous from outlet to outlet or to junction boxes or cabinets, and the conduit must properly enter, and be secured to all fittings and the entire system must be mechanically secured in position. In case of service connections and main runs, this involves running each conduit...