What is the minimum depth requirement for burying plate electrodes made of iron or steel?

The minimum depth requirement for burying plate electrodes made of iron or steel is 30 inches. This requirement is outlined in the National Electrical Code (NEC), which establishes safety standards for electrical installations. The proper depth ensures that the electrode is adequately embedded in the ground to provide an effective ground connection, minimizing the risk of potential electrical hazards and improving the electrical grounding system's overall performance.

This depth requirement is particularly relevant for plate electrodes because they are often used in grounding systems to dissipate electrical surges safely into the ground. A deeper installation helps to shield the electrodes from physical damage, environmental factors, and corrosion, which could compromise their functionality over time.

In contrast, other options do not meet the established safety standards, as they do not provide sufficient depth to ensure optimal performance and protection of the grounding system.