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A ground/earth fault is a fault where part of the current returns back through a path other than the opposing hot or, more critically, neutral. A neutral/earth fault is dangerous because the circuit will continue to function normally, but the hot and neutral leg currents are imbalanced, and the chassis can become energized.
Reverse faults form because of the process of compression. (d. reverse). Reverse faults are formed when the hanging wall moves up relative to the foot wall. Convergent plate margins occur where tectonic plates come together. Reverse faults are usually formed along these plate margins.