. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . essly left set. V ^ I ^ ] Fig. 85. Fuses. A fuse is placed in series with the motor circuit beforeit enters the controller wiring, but where circuit breakers are usedinstead of canopy switches, the fuse box may sometimes be dispensedwith. The fuse box on street cars is usually located underneath oneside of the car body where it is accessible for replacing fuses, butwhere a motormans cab is used, the fuse may beplace
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . essly left set. V ^ I ^ ] Fig. 85. Fuses. A fuse is placed in series with the motor circuit beforeit enters the controller wiring, but where circuit breakers are usedinstead of canopy switches, the fuse box may sometimes be dispensedwith. The fuse box on street cars is usually located underneath oneside of the car body where it is accessible for replacing fuses, butwhere a motormans cab is used, the fuse may beplaced in the cab. The fuse may be of any ofthe types in c(mimon use, either open or the Westinghouse fuse box it is necessary onlyto open tlie box and drop in a piece of straightcopper wure of the right length and size. Theclosing of the box clamps this wire to the termi-nals and establishes a circuit through the cop-per wire as a fuse. Of course this copper wireis of small enough size to be fused by a danger-ously heavy current. Lightning Arresters. A lightning arresteris used on all cars taking current from overheadlines. The lightning arrester is connected to the. Fig. ;;g. main circuit as it conies from the trolley base,before it reaches any of the other electrical de-vices on the car, so that it may afford them ])rotection. A conunontype of lightning arrester is shown in Fig. 3(). One lernunal of the 12 ELECTRIC RAILWAYS lij;litiiiiig arrester is connected to the motor frame so as to .groundit, and the other is connected with the trolley. In most forms oflightning arrester, a small air gap is provided, not such as to |x?r-mit the 500-volt current to jump across, but across which the light-ning will jinnj) on account of its high potential. To prevent anarc being established across the air gap by the power house cun-ejitafter the lightning discharge has taken place and started the arc,some means of extinguishing the arc is provided. In the GeneralElectric Companys li
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