What is the minimum required AWG size for copper grounded system conductors in high-impedance grounded neutral systems?

In high-impedance grounded neutral systems, the minimum required size for copper grounded system conductors is determined by specific electrical codes and standards to ensure safety and reliability. The National Electrical Code (NEC) outlines these requirements, aiming to protect against fault conditions and reduce the risk of electrical shock or fire hazards.

The correct answer indicates that a minimum size of 8 AWG for copper conductors is necessary in these systems. This is based on the need to handle potential fault current effectively while minimizing the voltage rise on the grounded systems. Using the correct sizing helps maintain system integrity and performance, especially in scenarios involving transient faults.

To contrast, other sizes would not meet the safety criteria set by the NEC for a grounded neutral system. Larger sizes may unnecessarily increase costs and complicate installation, while smaller sizes would pose risks by being unable to adequately manage fault current levels. Thus, selecting 8 AWG copper conductors aligns with both safety protocols and operational effectiveness in high-impedance grounded neutral systems.