Underground Transmission and Distribution for Electric Light and Power |
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alternating current Ampere apparatus armor asbestos bonding cable sheaths capacity cement cent circuits Circular Mils city or town concrete conductors conduit line construction contractor copper cost cover diameter dielectric dielectric strength direct current distribution duct line ductors duplex cables electrical electrical conductors electrolysis engineer excavation feeders fiber fuses ground high-tension hole installation iron joint junction boxes jute laid layers lead sheath lead sleeve length load manhole manufacturer metal method moisture necessary neutral operating overhead wires paper paper-insulated pavement pipe placed pole pressure prevent protection reactance reel relays removed rods rope rubber SECONDARY sections service box service connections short-circuit shown in Fig single-conductor cables solder space specifications splice standard station street structures subway surface TABLE tape temperature thickness of insulation three-conductor three-phase three-wire tile tion transformer trench trouble tube underground cables underground system usually voltage volts
Popular passages
Page 227 - As a unit of current, the international ampere, which is one-tenth of the unit of current of the CGS system of electro-magnetic units, and which is represented sufficiently well for practical use by the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with accompanying specifications,1 deposits silver at the rate of o.ooi 1 1 8 of a gramme per second.
Page 227 - AH a unit of resistance, the international ohm, which is based upon the ohm equal to 109 units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 227 - ... of the electromotive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15° C., and prepared in the manner described in the accompanying specification...
Page 227 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water...
Page 227 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2.
Page 228 - As the unit of induction, the henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt, while the inducing current varies at the rate of one ampere per second.
Page 5 - ... is proposed or in use within sixty days after the passage of this act, it shall be the duty of such Board to cause to be devised and made ready for use such a general plan as will meet the requirements of said Act and of this Act, and the Board shall have full authority to compel all companies operating electric wires to use such subway so prepared in accordance with the provisions of this Act. Wherever in the suburbs or along the streets, avenues...
Page 228 - As a unit of work, the joule, which is equal to 107 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm. As a unit of power, the watt, which is equal to 10...
Page 102 - Conductor. — A wire or combination of wires not insulated from one another, suitable for carrying a single electric current. The term " conductor " is not to include a combination of conductors Insulated from one another, which would be suitable for carrying several different electric currents. Rolled conductors (such as busbars) are, of course, conductors, but are not considered under the terminology here given.
Page 27 - Location The underground system shall be so located as to be subject to the least amount of disturbance. Care shall be exercised to avoid catch basins, pipes, or underground structures which have been installed or are planned for the future. Manholes, handholes or terminal poles shall, where practicable, be located off the railroad right-of-way.