What is the minimum size of a grounding conductor for a 200A service?

The minimum size of a grounding conductor for a 200 amp service is determined by the National Electrical Code (NEC) and various local codes, which specify the minimum requirements to ensure safety and effectiveness in grounding systems. For a 200A service, a grounding conductor is essential for providing an effective path for fault current to ground, which protects both the electrical system and users from electrical shock and fire hazards.

Selecting #6 AWG copper or #4 AWG aluminum establishes a reliable grounding system that can safely handle any potential fault currents associated with a 200 amp service. Copper is generally preferred for its superior conductivity and flexibility, so the #6 AWG copper wire is suitable for grounding purposes. Aluminum is also an acceptable material for grounding conductors, and #4 AWG aluminum provides sufficient capacity to ensure safety in case of fault conditions.

Choosing the correct size is crucial because undersized conductors could overheat and fail to appropriately protect against electrical faults. Therefore, #6 AWG copper or #4 AWG aluminum grounding conductors meet the requirements set forth for proper grounding in a 200A service, ensuring safety and compliance with electrical codes.