What is the minimum diameter for ground rods for buildings under 75 feet high?

The minimum diameter for ground rods used in electrical systems for buildings under 75 feet high is specified as 5/8 inch. This standard is established by the National Electrical Code (NEC) and is designed to ensure adequate grounding for lightning protection and electrical safety.

Ground rods serve several important functions, including providing a path for lightning strikes and grounding electrical systems to prevent damage and ensure safety. The 5/8 inch diameter is optimal because it strikes a balance between physical strength and conductivity, ensuring that the rod can effectively dissipate electrical energy into the ground without being prone to damage or corrosion over time.

Using a rod with a smaller diameter may not provide sufficient strength or conductivity, while a larger diameter may be unnecessarily burdensome and could complicate the installation process. By adhering to the 5/8 inch minimum, compliance with safety regulations is maintained, ensuring both effective lightning protection and overall electrical safety for structures under the specified height.