Master Electrician Practice Exam

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What is the status of using aluminum as a grounding electrode?

  1. Recommended

  2. Optional

  3. Permitted

  4. Prohibited

The correct answer is: Prohibited

Using aluminum as a grounding electrode is prohibited due to concerns about its performance in corrosion resistance and electrical conductivity compared to copper. Grounding electrodes are crucial for safety, ensuring that electrical faults have a reliable path to the ground, preventing potential hazards such as electric shock or fire. Aluminum, while a good conductor, can be susceptible to oxidation, which can increase resistance at the connections over time. This oxidation can hinder the effectiveness of the grounding system, potentially leading to unsafe conditions. In contrast, copper is generally recommended for grounding applications because it does not deteriorate or corrode in the same way as aluminum, maintaining a low resistance path to ground. Hence, the prohibition on using aluminum underscores the electrical codes and safety standards that prioritize reliable grounding systems.

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