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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.
Because of its horizontal direction of movement, the San Andreas fault is categorized as a transform or strike-slip fault. Other faults are categorized by vertical movement. If the vertical movement is downward, the fault is categorized as a normal fault. Vertical movement upward creates a reverse fault.