What is the minimum diameter of a solid grounding rod?

The minimum diameter of a solid grounding rod is 5/8 inch. This standard is established to ensure that the grounding rod is sufficiently robust to provide an effective path for electrical fault currents to safely dissipate into the ground. A grounding rod's effectiveness is influenced by its diameter, as a larger diameter can carry more current and provide a lower resistance path.

While there are various standards and guidelines that dictate the specifications for grounding systems, the 5/8 inch diameter is commonly recognized in many codes and regulations as the minimum acceptable size for solid grounding rods. This helps ensure the grounding system's effectiveness in protecting both equipment and personnel from electrical hazards.

In contrast, the other diameter options either do not meet minimum requirements or are not typical specifications for solid grounding rods. This highlights the importance of adhering to established standards in electrical work to ensure safety and functionality.