What kind of system requires independent grounding to minimize fault current?

Separately derived systems require independent grounding to minimize fault current primarily because they are typically not connected to the earth ground at their source. This means that these systems must establish their own grounding system to ensure safety and stability. Independent grounding helps to control fault currents and prevent electrical shock hazards, especially in situations where electrical systems operate independently from the utility supply grid.

A separately derived system, such as a generator or transformer that feeds a load, must be grounded in a way that protects both equipment and personnel. By employing an independent grounding system, the effects of a ground fault can be effectively managed, minimizing the risk of electric shock and maintaining operational integrity.

In contrast, grounded systems are already connected to the earth, which manages fault currents differently. Directly coupled systems and transfer systems do not specifically mandate independent grounding for the same safety reasons. Each electrical system type has its own grounding requirements, but independently derived systems notably need this additional precaution to handle fault currents safely.