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Course ID


This course is a general introduction to fault location in primary URD cable. The course covers capacitor discharge equipment, how it is used to locate faults, and a demonstration of how to locate a cable fault.


  • Describe the features, controls, and functions of the power source for one type of capacitor discharge unit.
  • Describe two types of tests commonly performed on primary URD cables.
  • Describe how to use capacitor discharge equipment to locate a primary cable fault.




  • Explain what a ground fault is.
  • List the essential components contained in URD fault-locating equipment.

Capacitor Discharge Unit

  • Identify and explain the purpose of the controls on a typical capacitor discharge test unit.
  • Explain the function of the high potential (hipot) test.
  • Explain the function of the capacitor (cap) discharge test.

Locating a Primary Cable Fault – Parts 1 & 2

  • Interpret a system diagram.
  • Describe how to verify that a cable is dead.
  • Explain how to connect the cables on a capacitor discharge test unit so that it can be used to test for cable faults.
  • Describe how to use a pickup and detector with a capacitor discharge test unit.
  • Describe how to use a capacitor discharge test unit to pinpoint the location of a fault.