Which of the following poses a risk if grounded improperly?

Prepare for the Grounding II Exam with flashcards, multiple choice questions, and detailed explanations for every question. Ace your test with confidence!

Improper grounding in electrical systems can lead to serious safety hazards, and among the choices provided, 480V, three-phase systems pose a significant risk if grounded incorrectly. Three-phase systems are more complex than single-phase systems, and they typically carry higher currents and voltages. A fault in such a system can create a significant hazard, potentially resulting in electric shock, equipment damage, or fire.

Additionally, grounding is essential in three-phase systems for ensuring that any fault currents are safely conducted away and do not endanger personnel or equipment. If the grounding is inadequate or improperly installed, the system may not effectively clear faults, leading to dangerous operating conditions.

In contrast, choices like the 120V, single-phase systems, the 240V residential systems, and even the 600V commercial systems may also pose risks if grounded improperly, but the three-phase system at 480V represents a higher and more complex risk due to its capacity and the critical role grounding plays in its operation. Therefore, the correct identification of the 480V three-phase system as posing a higher risk underscores the importance of proper grounding in ensuring electrical safety.

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