Final answer:
Grounding systems are essential for safely redirecting electrical currents during faults, lightning strikes, and short circuits. They provide a safe path for excess currents, protecting both equipment and individuals. Thus, the answer is that grounding is used for faults, lightning, and short-circuit currents.
Explanation:
Grounding Systems and Their Functions
Grounding systems are critical in electrical engineering as they provide a safe path for excess electrical energy. They are designed to manage and redirect electricity in specific scenarios to protect both equipment and individuals. Here’s a breakdown of the terms in the question:
- Fault Current: This refers to unintentional current that flows through the ground due to a fault in the system. Grounding provides a safe path to minimize hazards in case of faults.
- Lightning: Lightning strikes can induce high voltages and currents in electrical systems. Grounding provides a method for safely dissipating this energy into the earth.
- Short-Circuit Current: This occurs when two points in an electrical circuit become unintentionally connected, allowing an exaggerated flow of current. Grounding is crucial here, as it mitigates risks associated with this unexpected surge.
Based on the definitions above, grounding systems serve to provide a path for fault current, short-circuit current, and during lightning strikes. Therefore, the correct answer to the question is:
d. I, II, & III.
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