. The Street railway journal . thout exceeding the spanon the two trolley poles. At the instant the car enters thisdead section, whichever main switch is closed willopen, owing to the fact that the circuit energizing itsretaining coil is broken. The car can run over thisdead section at full speed, and all the motorman hasto do to make the proper connections is to throw thecommutating switch and close the main a. c. or d. , as the case may be. In the event of the motorman closing the wrongmain switch it will open the moment his hand isremoved, since its retaining coil will not be ener-g
. The Street railway journal . thout exceeding the spanon the two trolley poles. At the instant the car enters thisdead section, whichever main switch is closed willopen, owing to the fact that the circuit energizing itsretaining coil is broken. The car can run over thisdead section at full speed, and all the motorman hasto do to make the proper connections is to throw thecommutating switch and close the main a. c. or d. , as the case may be. In the event of the motorman closing the wrongmain switch it will open the moment his hand isremoved, since its retaining coil will not be ener-gized. No harm will result from a motormansclosing the wrong main switch. If the a. c. switchis closed on the d. c. trolley the high-tension fuseswill immediately open the circuit. Again, if the switch is closed on the a. c. trolley, resulting in thetrolley fingers of the commutator switch being sub-jected to 3300 volts, no damage can be done, as pIG FUSEthey are insulated for 5000 volts. (high-tension a. c.). FIG. 21.—MAIN D. C. SWITCH
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
