Amtrak Maintenance Level 2 (AMT-2) Practice Test

What is the function of a Bus Jumper?

A cable used to transmit high voltage power between Pantographs and/or one unit of Electric equipment to another. The pantograph's insulating pad. A switch that disconnects the overhead line. A monitoring device.

Correct Answer:

A cable used to transmit high voltage power between Pantographs and/or one unit of Electric equipment to another.

Explanation:

A bus jumper is a high‑voltage conductor that links the traction power buses between pantographs or between units in a consists, carrying the main current from one part of the electrical system to another. This allows multiple pantographs or cars to share the same power source and keeps power flowing when connecting different sections or units. It’s designed for the system’s voltage and current, and must be checked for proper insulation, wear, and secure connections. The pantograph insulating pad, a switch that disconnects the overhead line, and a monitoring device are different components with separate functions.

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