SOLUTION

Connected to ground without the insertion of any resistor or impedance device is referred to as Solidly Grounded (Grounded, Solidly).

The term solidly grounded suggests that the resistance or impedance of the grounding electrode conductor is ignored. The system is considered solidly grounded when it is connected to the grounding electrode with a copper or aluminum grounding electrode conductor, so long as an impedance device such as a resistor or inductor is not located in the path from the service equipment or separately derived system to the grounding electrode. Another common type of system grounding is impedance or high-impedance grounding. A resistor or an inductor is inserted in the grounded conductor path from the grounding electrode to the service equipment or feeder equipment. This limits the fault current on the first ground fault.