If the resistance of a single driven ground rod exceeds 25 ohms, what action must be taken?

If the resistance of a single driven ground rod exceeds 25 ohms, what action must be taken?

• A. No action is needed
• B. A supplemental electrode shall be added
• C. The ground rod must be replaced
• D. Increase the size of the existing ground rod

Answer: (B)

When the resistance of a single driven ground rod exceeds 25 ohms, it is necessary to add a supplemental electrode. This action is required to improve the overall grounding system and ensure proper electrical safety. Grounding systems are crucial for protecting against electrical faults and ensuring equipment and personnel safety, and a resistance greater than 25 ohms typically indicates that the grounding effectiveness is insufficient. By adding a supplemental electrode, the total grounding resistance can be lowered by providing an additional path for fault currents to safely dissipate into the earth. This helps in achieving a more effective ground connection, which is vital in preventing electrical shock hazards and ensuring the reliability of electrical systems. The practice of adding a supplemental electrode is based on safety standards and codes that mandate specific grounding resistances for electrical installations.

When the resistance of a single driven ground rod exceeds 25 ohms, it is necessary to add a supplemental electrode. This action is required to improve the overall grounding system and ensure proper electrical safety. Grounding systems are crucial for protecting against electrical faults and ensuring equipment and personnel safety, and a resistance greater than 25 ohms typically indicates that the grounding effectiveness is insufficient.

By adding a supplemental electrode, the total grounding resistance can be lowered by providing an additional path for fault currents to safely dissipate into the earth. This helps in achieving a more effective ground connection, which is vital in preventing electrical shock hazards and ensuring the reliability of electrical systems. The practice of adding a supplemental electrode is based on safety standards and codes that mandate specific grounding resistances for electrical installations.