Can driving be continued, in the event of burn-out of one of the cable shunts in the pantograph?
Show the correct answer
Correct answer
C. No, because it may lead to burn out of the second cable of the pantograph.
Explanation
In the photo you can see a tram pantograph with shunt cables. After you find that one shunt cable in the pantograph has burnt out, you must not continue driving, because this may cause the second cable to burn out as well - answer C.
The shunt cables carry current through the joints of the pantograph and bypass the bearings. When one cable burns out, all the current flows through the other one, which overheats and may also burn out. Then the current will flow through the bearings, which will quickly be destroyed. Driving without restrictions (answer A) is therefore a mistake, and a short circuit between the cable and the bodywork (answer B) is not the main reason for the ban. You report the fault to the dispatcher.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)