. Electrical world. on, above noted, had increased cables is 115,000 ft., and they are all laid in 3-in. vitrified clay length of underground wires to 1,704 ft. in the same length of Each cable carries three No. 4/0 copper wires insulated with paperconduit. The Leominster plant had 150 ft. of wire underground at and covered outside with a lead sheath that is i/io in. thick,the date just named. In the electric system at Lynn 6,565 ft. of wire About each conductor the paper is 3/16 in. thick, the spaces be-was put underground during the year ending June 30, 1902, and in tween the thr
. Electrical world. on, above noted, had increased cables is 115,000 ft., and they are all laid in 3-in. vitrified clay length of underground wires to 1,704 ft. in the same length of Each cable carries three No. 4/0 copper wires insulated with paperconduit. The Leominster plant had 150 ft. of wire underground at and covered outside with a lead sheath that is i/io in. thick,the date just named. In the electric system at Lynn 6,565 ft. of wire About each conductor the paper is 3/16 in. thick, the spaces be-was put underground during the year ending June 30, 1902, and in tween the three conductors of each cable are filled with jute, and out-the following year the length was increased to 10,618 ft. At Lenox side of the three conductors, next to the lead sheath, there is anotherthe lengths of wires and conduits alike had increased to 51,023 ft. 3/16-in. layer of paper. These cables carry three-phase, 60-cycIeat the middle of 1903. current at 6,900 volts. Since June 30. 1903, the electric light and. ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 21. power circuits in the central part of the business section of Lowellhave all been put underground. This has largely increased thelengths of cable shown for the Lowell Company in the above table,but the length of conduit is about the same. In its present state theLowell system includes about fifty miles of cables that vary in sizefrom duplex No. 10 pressure wires to conductors of 500,000 cable is laid in tile conduits, as a rule, is mostly rubber-in-sulated, and is lead-covered. Much of this cable distributes 22,000-volt alternating current, and many of the transformers are in streetmanholes, from which secondary circuits of no volts are one point where the cables cross a bridge under its paving theyare carried in iron pipes to save room. In Lowell the conduit systemis continuous from the generating station on the bank of the ConcordRiver to the business section. At Providence, R. I., the Narragans
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
