. The Street railway journal . JlWE 9, 1906.] STREET RAILWAY JOURNAL. 911 per wire, carried on the pole line and in the conduits used forthe main transmission system, and the signal bridges areequipped with extension brackets, with cross arms, for con-venience in running wire lines to signals. For the operation of signal circuits, signal motors, indi-cators, and signal lighting, the 3000-volt current is stepped down 50 volts,through transformers placed on signalbridges or transmission line secondary of the transformer isprovided with a ground connection,formed by burying a 2-ft. x 3-
. The Street railway journal . JlWE 9, 1906.] STREET RAILWAY JOURNAL. 911 per wire, carried on the pole line and in the conduits used forthe main transmission system, and the signal bridges areequipped with extension brackets, with cross arms, for con-venience in running wire lines to signals. For the operation of signal circuits, signal motors, indi-cators, and signal lighting, the 3000-volt current is stepped down 50 volts,through transformers placed on signalbridges or transmission line secondary of the transformer isprovided with a ground connection,formed by burying a 2-ft. x 3-ft. xi-i6-in. copper plate, to which isbrazed a No. 4 B. & S. gage copperwire. For track circuit operation the volt-age depends on the length of trackcircuits, and varies from i^ volts forcircuits of 200 ft. to 8 volts for circuits of 5000 ft. The reduction from 50 volts to the trackvoltage is made by a transformer provided with four taps,which will permit of one type of transformer being used on blocks being about 3200 ft
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
