. The Street railway journal . STANDARD 30-FT. STEEL POLE WITH REINFORCING SLEEVE AT SIDEWALK LINE cables varying in cross section from 1,000,000 circ. mil to3,250,000 circ. mil, and being connected to the rail at eachmanhole through a No. 0000 bond. The standard return feederis a 7 x 7 strand bare copper cable. In addition to the feeder cables, numerous tie-line cables are inuse between the d. c. distributing centers. The d. c. tie-line lay-out is shown on Plate XXX. in this issue. The tie cables, aswill be readily understood, are very serviceable in equalizing theload betwen power stations a
. The Street railway journal . STANDARD 30-FT. STEEL POLE WITH REINFORCING SLEEVE AT SIDEWALK LINE cables varying in cross section from 1,000,000 circ. mil to3,250,000 circ. mil, and being connected to the rail at eachmanhole through a No. 0000 bond. The standard return feederis a 7 x 7 strand bare copper cable. In addition to the feeder cables, numerous tie-line cables are inuse between the d. c. distributing centers. The d. c. tie-line lay-out is shown on Plate XXX. in this issue. The tie cables, aswill be readily understood, are very serviceable in equalizing theload betwen power stations and sub-stations, and are also of greatservice in case of breakdowns. A. C. CABLES Each rotary converter sub-station is connected to the gener-ating plant by at least two high-tension underground cables varyingin size from No. 0 three-conductor to No. 0000 insulation on high-tension cables consists of a 6-32-in. sat-urated paper wall around each conductor and a 6-32-in. belt. I Weight of Oast Iron Outside Cover 186 Lbs, Weight Inside Cover-—— 65 Lbs. CAST-IRON MANHOLE FRAME AND COVER around the three conductors after they have been twisted lead covering is 5-32 ins. thick. The working voltage is1 3,200 three-phase,, and each cable is subjected to a break-down test of 26,000 volts between all conductors before the excessive voltage surges which may occur on the system. Thea. c. cables terminate in cast-bronze bells, which are supported inthe power station and sub-stations immediately under the oilswitches. This bell is illustrated herewith. Connection is madeto the oil switch by means of three single conductor cables in-sulated with 1 4-32 in. of rubber compound, and protected by adouble waterproof braid. These cables are spliced to the threeconductors of the lead-covered cable in the terminal bell. Thea. c. tie lines are shown on Plate XXIX. OVERHEAD CONSTRUCTIONThe standard overhead construction is span wire with steelpoles in th
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
