NEC Commercial Electrical Practice Test

What is the minimum spacing between separate electrodes in a grounding system?

1. 3 ft

2. 5 ft

3. 6 ft

4. 8 ft

The correct answer is: 6 ft

The minimum spacing between separate electrodes in a grounding system is specified as 6 ft. This requirement is set forth in the National Electrical Code (NEC) to ensure effective grounding and minimize the risk of ground loops or interference. When electrodes are properly spaced, it allows for more effective dissipation of fault currents into the earth, enhancing safety and reliability of the electrical system. Adequate spacing helps to reduce any potential voltage differences between grounding electrodes, which could otherwise lead to dangerous touch voltages or equipment malfunctions. Properly following this spacing ensures that the grounding system functions efficiently to protect both the electrical equipment and personnel from electrical faults.