How is ground fault protection implemented in aircraft wiring, and what symptom indicates a fault?

• A. Differential current sensing or ground fault relays detect leakage to ground; symptom includes unexpected breaker trips and abnormal bus voltage loss.
• B. Visual inspection only; no electrical symptoms.
• C. Thermal sensors detect leakage; no electrical trips.
• D. Ground faults are detected by sound alarms; no circuit trips.

Answer: (C)