What is the target ground resistance for a Type B Standard Duty Site?

• A. 10 Ohms
• B. 25 Ohms
• C. 5 Ohms
• D. 15 Ohms

Answer: (A)

The target ground resistance for a Type B Standard Duty Site is 10 ohms. This value reflects a balance between safety and practicality: a low enough impedance to keep fault-path voltages manageable and ensure solid equipment grounding, while remaining achievable in typical site conditions with a properly designed grounding grid, multiple electrodes, and good soil contact. When testing, this target guides what you’re aiming for; if measured resistance is higher, corrective steps like adding more ground rods, forming a better interconnected grounding grid, improving soil moisture conductivity, and tightening bonds are pursued to bring the system down toward 10 ohms. Other numbers would represent stricter or looser targets and aren’t the defined standard for this category.