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← TechnologyWhich consequence results when metal fragments bridge a 277V circuit's arc chute?
A)Cascading phase-to-phase fault occurs✓
B)Harmonic distortion is selectively reduced
C)Capacitive coupling rises negligibly
D)System's ground impedance dramatically diminishes
💡 Explanation
A phase-to-phase fault escalates due to ionized air creating conduction paths, thereby triggering further shorts in each phase. The mechanism is dielectric breakdown leading to intense current surges, because air's insulation decreases. Therefore, a catastrophic system failure becomes likelier, rather than other outcomes like minor ground variations.
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