Good grounding resistance value

 A good ground resistance value typically depends on the specific application, but in general:

-For residential and commercial grounding systems

 a resistance value of 5 ohms or lessis often recommended.

For critical systems

 like substations, communication towers, and sensitive electronics, the target is usually 1 ohm or less to ensure a reliable grounding system.

  

Lower resistance values ensure better protection against electrical faults and surges, providing a safer and more stable system. However, the actual required value can vary depending on factors like soil composition, moisture levels, and safety standards specific to the region or industry.