Electric Lighting ...D. Van Nostrand Company, 1904 |
Загальні терміни та фрази
alternating current amperes angle of lag apparatus arc lamps armature arrangement bus bars cable candle-power capacity carbon cent conductors conduit constant potential copper loss core cross-arms cross-section curve diameter difference direct current distance distribution duct dynamo effect efficiency electric lighting electrical conductors employed energy equal example fact feeders feeding-points filament flow frequency full load fuse greater group of lamps heat hence illustrated in Fig impedance incandescent lamps inch increase inductance insulation joint latter length less machines magnetic mains maximum mechanical metal meter method motors ohms one-half operation ordinary overhead lines parallel phase pipes placed pole polyphase power factor practically pressure reactance regulation represented in Fig resistance rheostat rotary rotary converters secondary circuit secondary coils self-induction shown in Fig shunt side single-phase supplied switch temperature thickness three-phase three-wire system tion trans transformers tube two-phase two-wire two-wire circuit usually voltage volts watts
Популярні уривки
Сторінка 348 - 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 367 - The temperature should be measured after a run of sufficient duration to reach practical constancy. This is usually from 6 to 18 hours, according to the size and construction of the apparatus. It is permissible, however, to shorten the time of the test by running a lesser time on an overload in current and voltage, then reducing the load to normal, and maintaining it thus until the temperature has become constant. In apparatus intended for intermittent service, as railway motors, starting rheostats,...
Сторінка 348 - 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 353 - All elbows or bends must be so made that the conduit or lining of same will not be injured. The radius of the curve of the inner edge of any elbow must not be less than three and one-half inches.
Сторінка 359 - ... 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.
Сторінка 344 - Must each be provided with a name-plate, giving the maker's name, the capacity in volts and amperes, and the normal speed in revolutions per minute.
Сторінка 351 - Packing Houses, Stables, Dye Houses, Paper or Pulp Mills, or buildings specially liable to moisture or acid or other fumes liable to injure the wires or their insulation, except where used for pendants : i.
Сторінка 353 - If the wires are unusually liable to be disturbed, the distance between supports should be shortened. In buildings of mill construction, mains of No.
Сторінка 353 - Moldings — (For wiring rules, see _Yb. 24.) a. Must have, both outside and inside, at least two coats of waterproof paint, or be impregnated with a moisture repellent. b. Must be made of two pieces, a backing and capping, so constructed as to thoroughly incase the wire, and provide a one-half inch tongue between the conductors, and a solid backing, which, under grooves, shall not be less than three-eighths of an inch in thickness, and must afford suitable protection from abrasion.