Grounding Resistance Norms

The "Grounding Resistance Norms" table is a crucial resource for electricians, engineers, and safety inspectors who are responsible for the design, installation, and maintenance of grounding systems. Proper grounding is essential for protecting buildings, equipment, and people from electrical faults, lightning strikes, and other hazards. This table provides the maximum allowable grounding resistance values for various applications, ensuring that grounding systems are effective and compliant with safety standards.

Each type of installation has specific grounding requirements, as listed in the table. For example, industrial facilities and power substations require much lower grounding resistance compared to residential buildings due to the higher risk of electrical faults and the need for greater protection.

Use this table as a guide when designing or inspecting grounding systems to ensure that they meet the necessary standards. If the grounding resistance exceeds the maximum allowable value for a given application, corrective measures such as improving the grounding system or enhancing the soil conductivity should be taken to reduce the resistance.

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