Wiring for Light and Power: A Detailed and Fully Illustrated Commentary on the National Electrical CodeMcGraw-Hill Book Company, Incorporated, 1924 - 551 стор. |
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Загальні терміни та фрази
accidental ground alternating current alternating-current alternating-current motor amperes approved arc lamps armature armored cable arranged Bolt branch circuit building busbars bushings cabinet canopy carrying capacity circuit breaker Clamp Cleat Code conduit system construction copper direct current direct-current disconnecting Edison plug electrical equipment exposed fire Fixture Wire flexible cord Flexible Tubing floor frame ground connection ground detector ground wire grounding conductor heating appliances holes Incandescent Lamp inch installed insulating joint iron KNIFE SWITCHES knob-and-tube lighting lightning arrester located machine material metal raceway method moisture motor mounted name plate neutral wire non-combustible open wiring operating outlet boxes permanently grounded permitted placed plug pole Porcelain resistance rheostat rubber insulation Rule screws service switch short-circuit shown in Fig single-pole snap switches SOCKETS AND RECEPTACLES soldered splices Steel Strain Insulator Strap supported surface switchboard terminal three-wire transformer trip coils two-wire ungrounded voltage voltmeter volts wall
Популярні уривки
Сторінка 171 - Cabinets and cutout boxes which contain devices or apparatus connected within the cabinet or box to more than 8 conductors, including those of branch circuits, meter loops, sub-feeder circuits, power circuits and similar circuits, but not including the supply circuit or a continuation thereof, shall have back wiring spaces or one or more side wiring spaces, side gutters or wiring compartments.
Сторінка 172 - The spacing within cabinets and cutout boxes shall be sufficient to provide ample room for the distribution of wires and cables placed in them, and for a separation between metal parts of devices and apparatus mounted within them as follows: (1) Base.
Сторінка x - 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 172 - Except as noted above, there shall be an air space of at least ' : inch between the walls, back, gutter partition, if of metal, or door of any cabinet or cutout box and the nearest exposed currentcarrying part of devices mounted within the cabinet where the potentials do not exceed 250 volts.
Сторінка 3 - Adjustable-speed motors, in which the speed can be varied gradually over a considerable range, but when once adjusted remains practically unaffected by the load, such as shunt motors designed for a considerable range of speed variation.
Сторінка 193 - Xo. 65.) a. Must be placed on all service wires, either overhead or underground, in the nearest readily accessible place to the point where the wires enter the building, and arranged to cut off the entire current.
Сторінка 236 - Circuits is allowed only when such circuits are so arranged that under normal conditions of service there will be no passage of current over the ground wire.
Сторінка 519 - If a gas pipe electrode is used, connection shall be made between the gas meter and the street main. In every case the connection to the grounding electrode shall be made as close to the earth as practicable.
Сторінка 67 - In damp places the wooden boxing may be preferable because of the precautions which would be necessary to secure proper insulation if the pipe were used. With this exception, however, iron piping is considered 26.
Сторінка 6 - cable" is applied by some manufacturers to a solid wire heavily insulated and lead covered; this usage arises from the manner of the insulation, but such a conductor is not included under this definition of "cable." The term "cable" is a general one and in practice it is usually applied only to the larger sizes. A small cable is called a "stranded wire" or a "cord," both of which are defined below.