How deep must a ground ring consisting of 20' of No. 2 bare copper be buried?

• A. 1.5 feet below grade
• B. 2 feet below grade
• C. 2.5 feet below grade
• D. 3 feet below grade

Answer: (C)

The correct depth for burying a ground ring made of No. 2 bare copper is indeed 2.5 feet below grade. This requirement helps ensure that the ground ring provides effective grounding for electrical systems, minimizing the risk of electric shock and enhancing the safety of electrical installations.

Grounding systems are vital for dissipating electrical surges, such as those caused by lightning strikes or power surges, and they must be installed at a sufficient depth to remain effective under various environmental conditions. The specified depth helps protect the grounding system from physical damage and ensures that it remains effective over time.

Additionally, the National Electrical Code (NEC) provides guidelines on grounding electrode systems, including grounding conductors and their burial depth, further supporting the choice of 2.5 feet as an appropriate depth for this application. The depth might be affected by local codes or soil conditions, but the 2.5 feet standard offers a reliable baseline for effective grounding.