What is the required ground resistance for a Type A Light Duty Site?

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

Answer: (A)

Grounding performance is about delivering a low-impedance path to earth so fault currents can safely dissipate and equipment stays safe. For a Type A Light Duty Site, the standard requires a ground resistance of 25 ohms or less. This threshold provides a reliable path for fault currents and keeps touch potential within safe limits under typical soil conditions and loads. In practice, this is achieved with a proper grounding grid: multiple rods connected to a central ground ring, solid bonding between all metal structures, and appropriate conductor sizing and moisture management if the soil is dry. If measurements show resistance above 25 ohms, you need to expand and improve the ground system until the value meets the requirement. Values like 10, 5, or 15 ohms would be more stringent than required, but they are not the stated minimum that must be met for this site type.