ICC Residential Electrical Inspectors Practice Exam

What grounding electrode conductor size is typically required for a service over 1000 A?

1. #4 AWG

2. #2 AWG

3. #6 AWG

4. #10 AWG

The correct answer is: #2 AWG

The grounding electrode conductor size for a service over 1000 A is typically #2 AWG. This requirement is grounded in the National Electrical Code (NEC), which specifies minimum conductor sizes based on the ampacity of the service. For services rated over 1000 A, using #2 AWG copper or aluminum wire provides adequate grounding to ensure safety in the electrical system. A properly sized grounding electrode conductor is critical for effectively dissipating fault currents to the ground, thereby protecting people and property from electrical hazards. The use of larger gauge conductors like #2 AWG ensures minimal resistance and enhances system reliability during fault conditions. This is particularly important for large services, as the potential for fault current is significantly greater, necessitating a robust grounding solution to maintain safety and compliance with electrical codes.