True or False: Fault current does not need a complete circuit to flow.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (B)

Current flow always needs a closed path back to the source. A fault current is simply a large current that occurs because the fault provides a low-impedance path between conductors or between a conductor and the ground, but there still must be a return path to the source. If any part of the circuit is open, the current cannot complete the loop, so the fault current cannot flow continuously. In practical terms, a shorted fault creates a strong current only because the loop from source to fault and back to source is intact; break the loop, and the current drops to zero. There can be momentary disturbances or capacitive leakage in highly energized systems, but those are not sustained fault currents. Hence, the statement is false because a complete circuit is required for fault current to flow.