The strengthening requirement for the ring connections is to use copper in at least how many points between Building Ground Ring and Tower Ground Ring?

• A. 1 point
• B. 2 points
• C. 3 points
• D. 4 points

Answer: (B)

The concept being tested is how a ground ring system is strengthened for reliability and safety. When Building Ground Ring and Tower Ground Ring are bonded, creating a continuous, low-impedance path between them is key. Using copper for these bond points matters because copper provides very good electrical conductivity and strong resistance to long-term corrosion in outdoor environments. This makes the bonds capable of carrying fault currents or lightning surge energy efficiently over time.

Reinforcing the ring by bonding at at least two points ensures the loop remains intact even if one connection deteriorates or is damaged. It provides redundancy so the grounding path doesn’t rely on a single bond. If there were only one bond, a failure at that point could break the loop or raise impedance, reducing the effectiveness of the ground system. Having two copper bonds gives a robust, multiple-path route around the ring while keeping installation straightforward.

More bonds beyond two aren’t typically required by the standard for the minimum strength, though extra bonds can add redundancy at additional locations if there’s a specific site risk.