International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them

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International Textbook Company, 1902
 

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Сторінка 4 - The American Institute of Electrical Engineers; The American Society of Mechanical Engineers; The American Society of Civil Engineers; The American Society of Mining and Metallurgical Engineers; and The American Society for Testing Materials.
Сторінка 38 - ... 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.
Сторінка 19 - Rigid supporting requires under ordinary conditions, where wiring along flat surfaces, supports at least every four and one-half feet. If the wires are liable to be disturbed, the distance between supports should be shortened. In buildings of mill construction, mains of No.
Сторінка 53 - All elbows or bends must be so made that the conduit will not be injured. The radius of the curve of the inner edge of any elbow not to be less than three and one-half inches.
Сторінка 69 - Stranded wires (except in flexible cords) must be soldered before being fastened under clamps or binding screws, and whether stranded or solid, when they have a conductivity greater than that of No. 8 B. & S.
Сторінка 20 - 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 68 - ... 12,500 All cut-outs and safety devices in place in the above. Where lamp sockets, receptacles and electroliers, etc., are connected, one-half of the above will be required.
Сторінка 50 - ... b. Each stranded conductor must have a carrying capacity equivalent to not less than a No. 18 B. & S. gauge wire. c. The covering of each stranded conductor must be made up as follows : 1. A tight, close wind of fine cotton. 2. The insulation proper, which shall be either waterproof or slowburning.
Сторінка 36 - Must be placed at every point where a change is made in the size of the wire (unless the cut-out in the larger wire will protect the smaller).
Сторінка 39 - Cut-outs should operate successfully under the most severe conditions they are liable to meet with in practice, on short circuits, with fuses rated at 50 per cent above, and with a voltage 25 per cent above, the current and voltage for which they are designed.

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