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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.
This can lead. to leaks caused by spiral failure of the O-ring. In general, tighter tolerance components or rigid. components with smooth or ground surface. finishes can use O-rings with the smallest cross-. sectional diameter regardless of the pressure.