What is the acceptable maximum resistance a grounding electrode should have?

The maximum resistance a grounding electrode should have is ideally 25 Ohms. This value is significant because it ensures that the grounding system can effectively facilitate fault currents to the ground, minimizing the risk of electric shock, equipment damage, and fire hazards. A grounding resistance of 25 Ohms is typically accepted as a standard in many electrical codes, ensuring adequate performance in most scenarios, especially in areas prone to electricity hazards.

Maintaining a resistance level at or below this threshold allows for proper grounding of electrical systems, ensuring that they operate safely and effectively under normal and fault conditions. Values higher than this can lead to insufficient grounding, reducing the safety and functionality of electrical systems. Thus, adhering to this maximum resistance level of 25 Ohms is crucial for both safety and compliance with regulations.