What is considered an acceptable ground resistance?

What is considered an acceptable ground resistance?

• A. A resistance that is greater than 50 ohms
• B. A measured resistance less than 25 ohms
• C. A resistance that is precisely 0 ohms
• D. A resistance that can be measured in kilohms

Answer: (B)

An acceptable ground resistance is considered to be less than 25 ohms. This threshold is based on industry standards that recommend a low resistance value to ensure that grounding systems are effective. A low resistance helps facilitate the safe dissipation of fault currents into the ground, which is crucial for the protection of life and equipment. If the ground resistance is higher than this value, it may indicate inadequacies in the grounding system, which could lead to potential issues, such as equipment malfunctions or electrical hazards. A resistance of precisely 0 ohms, while seemingly ideal, is practically unattainable in real-world applications due to the inherent resistance of materials used in grounding systems. Similarly, measuring resistance in kilohms would indicate excessive resistance that leads to poor grounding effectiveness, undermining safety protocols and equipment reliability.

An acceptable ground resistance is considered to be less than 25 ohms. This threshold is based on industry standards that recommend a low resistance value to ensure that grounding systems are effective. A low resistance helps facilitate the safe dissipation of fault currents into the ground, which is crucial for the protection of life and equipment.

If the ground resistance is higher than this value, it may indicate inadequacies in the grounding system, which could lead to potential issues, such as equipment malfunctions or electrical hazards. A resistance of precisely 0 ohms, while seemingly ideal, is practically unattainable in real-world applications due to the inherent resistance of materials used in grounding systems. Similarly, measuring resistance in kilohms would indicate excessive resistance that leads to poor grounding effectiveness, undermining safety protocols and equipment reliability.