NEC Commercial Electrical Practice Test

How should copper grounding conductors be installed in climates prone to corrosion?

1. Buried deep underground

2. With protective coatings

3. With additional size

4. It is not an issue

The correct answer is: With protective coatings

Copper grounding conductors should be installed with protective coatings in climates prone to corrosion to ensure their longevity and effectiveness. Corrosion can significantly reduce the conductivity of grounding systems, compromising their ability to provide a safe path for fault currents. Protective coatings, such as polyethylene or other corrosion-resistant materials, help shield the copper from moisture, chemical exposure, and other environmental factors that contribute to deterioration. This proactive approach enhances the durability of the grounding system, ensuring it functions properly over its expected lifespan. The other options fail to address the specific concerns related to corrosion. For instance, while burying conductors deeper underground might theoretically provide some protection from environmental factors, it does not specifically address corrosion and may not be feasible in all situations. Increasing the size of the conductor does not inherently prevent corrosion and can lead to added costs without directly improving the conductor's resistance to corrosion. The notion that corrosion is not an issue neglects the significant impact environmental factors have on grounding conductors, especially in areas susceptible to high humidity, saltwater, or industrial pollutants.