What is the minimum size of grounding electrodes for pipe or conduit?

The minimum size of grounding electrodes for pipe or conduit is specified to ensure effective grounding and bonding in electrical systems. A grounding electrode must provide a low-resistance path to earth to ensure the safety and protection of people and equipment from electrical faults.

In many codes and standards, a 3/4 inch diameter is recognized as the minimum size for grounding electrodes made from metal pipes or conduits. This size allows for adequate surface area for electrical contact with the soil while being substantial enough to resist corrosion over time. A grounding electrode made from smaller diameters might not provide the same level of conductivity or structural integrity, which could compromise the effectiveness of the grounding system.

Therefore, selecting a 3/4 inch pipe or conduit as the minimum size aligns with safety practices and regulatory requirements to ensure reliable grounding in fire alarm systems and other electrical installations.