What is the minimum size ground wire for a 200 amp service?

For a 200 amp service, the minimum size ground wire is determined by the National Electrical Code (NEC) guidelines, which provide standards to ensure safety and effectiveness in electrical installations. According to these standards, the appropriate grounding conductor size is based on the size of the service and the type of metal used.

In this case, using #4 AWG copper as the ground wire for a 200 amp service is the correct choice. This size is sufficient to safely carry the fault current that may occur during an electrical fault, thereby protecting both the electrical system and individuals by facilitating proper grounding. Ground wires are essential for providing a reliable path to ground, minimizing the risk of shock and ensuring that circuit breakers operate correctly in the event of an overload or fault.

Other sizes, such as #6 AWG or smaller, do not meet the safety requirements for a 200 amp service as they may not adequately handle the fault current or provide sufficient protection. Thus, utilizing #4 AWG copper ensures compliance with the NEC and enhances the overall safety of the electrical installation.