In a general industrial application, what kind of reading is acceptable for a new grounding system?

In a general industrial application, a reading of 5 ohms for a new grounding system is considered acceptable because it reflects a balance between safety and practicality. Grounding systems are essential for reducing the risk of electrical shock and ensuring the safe operation of electrical equipment by providing a path for fault current.

A grounding resistance reading of 5 ohms indicates that the grounding system is adequately low enough to facilitate effective fault current flow, which helps to protect personnel and equipment in the event of a fault. Although lower resistance values are often preferred for enhanced safety—such as 1 ohm or 3 ohms—5 ohms is a widely accepted standard that aligns with various industry practices and regulations.

Setting the standard at 10 ohms or higher may compromise safety and increase the risk of excessive voltage on exposed conductive parts during fault conditions. Thus, while options at 1 ohm or 3 ohms may be advantageous, 5 ohms serves as a practical threshold for many industrial applications.