The grounding conductor’s dimension for a 200-ampere electrical supply is determined by the National Electrical Code (NEC). This code specifies the minimum permissible measurement of the grounding wire, often copper or aluminum, based on the service entrance conductor size. For instance, if the service entrance conductors are copper, a No. 6 AWG copper grounding electrode conductor is typically required. This conductor connects the service equipment to the grounding electrode system.
Proper grounding is crucial for safety and equipment protection. It provides a low-impedance path for fault current, allowing overcurrent protection devices like circuit breakers to trip quickly and clear faults, minimizing the risk of electrical shock and fire. Historically, grounding practices have evolved significantly, with early electrical systems often lacking adequate grounding, leading to increased hazards. Modern codes mandate specific grounding requirements to ensure safer and more reliable electrical installations.