. Electric railway journal . placement. The conditions were called to theattention of the trolley man at that shop and the neces-sity of providing proper spring pressure to assist inconducting the current from the wheel to the harp wasexplained to him. Beneficial results were obtained atonce and this class of trouble was almost entirelyeliminated. How the Enigma of Increased FuseRequirements Was Solved THE purchasing department of a large electric rail-way property called the attention of the departmentof equipment to a large increase that was occurring inthe number of fuses used. The fuses we
. Electric railway journal . placement. The conditions were called to theattention of the trolley man at that shop and the neces-sity of providing proper spring pressure to assist inconducting the current from the wheel to the harp wasexplained to him. Beneficial results were obtained atonce and this class of trouble was almost entirelyeliminated. How the Enigma of Increased FuseRequirements Was Solved THE purchasing department of a large electric rail-way property called the attention of the departmentof equipment to a large increase that was occurring inthe number of fuses used. The fuses were of 250 and300-amp. capacity and were used to protect the mainpower circuits of the cars. Contact between the fuse sc. 130 120 L <II0<a §100 XI o 0)0<u 6070 -I ~\ H 7 UNA \L JSE H Ti NAL ITER on rUSl • E FT 1 tr r* — L 0 3 4 5 Time, Hours FIG. 1—GRAPHS SHOWING HIGH TEMPERATURE DUE TOPOOR CONTACT PRESSURE! ON THE FUSE TERMINAL. 4 5 Time, Hours FIG. 2—GRAPHS SHOWING REDUCTION IN TEMPERATURERISE WITH THE USE OF NEW FUSE BLOCK block and the fuse terminals was made through phosphorbronze contact clips. Investigation at the variousmaintenance shops of the system showed that the fuseswere blowing while in service. A check of the numberused as compared with previous years showed that in- 1094 Electric Railway Journal Vol. 52, No. 25 creases were occurring only at a few of the shops. Whenthis was called to the attention of the foremen at theseparticular points they stated that they believed themotormen were crowding their equipment harder thanat other points and thus overloading the fuses. Inspectors were detailed to watch operations on thoselines and a record was started showing the car numberson which fuses were blowing and the particular servicein which these cars were used. After the record hadbeen continued for a month it was evident that thetrouble was confined to certain cars and that the mostfrequent cases
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