Electrician's Licensing Practice Exam

Which wire size is required for the ground ring electrode in terms of AWG?

1. 4 AWG

2. 2 AWG

3. 6 AWG

4. 8 AWG

The correct answer is: 2 AWG

The ground ring electrode is an essential component of grounding systems, used to provide a low-resistance path to the earth to ensure safety and reduce the risk of electrical shock. The National Electrical Code (NEC) outlines specific requirements for grounding electrode conductors, including wire sizes based on the size of the service entrance conductors (SEC). The requirement for using a wire size of 2 AWG for a ground ring electrode is rooted in the need for sufficient conductivity and mechanical reliability, ensuring that the grounding system will operate effectively under fault conditions. A 2 AWG wire provides an adequate cross-sectional area that minimizes resistance to ground, which is paramount for safety. When considering the other wire sizes, such as 4 AWG, 6 AWG, and 8 AWG, they do not meet the NEC minimum requirements for a ground ring electrode when a specific size of service entrance conductor is in play. Using a wire gauge that is too small could compromise the performance of the grounding system, potentially leading to higher resistance and increased risk of electrical faults.