What is NOT a characteristic of a solidly grounded electrical system?

A solidly grounded electrical system is defined by a direct electrical connection from the neutral point of the electrical system to the ground, providing a low-resistance path for fault currents. Such systems have no intentional impedance, which ensures that in the event of a fault, the fault current can flow readily to ground. This low impedance is critical for the system's ability to quickly clear faults by enabling protective devices to operate effectively.

Additionally, solid grounding enhances safety by providing shock protection. If a person makes contact with an energized conductor, the ground connection allows fault current to flow, reducing the risk of electric shock by tripping circuit breakers or blowing fuses quickly.

The presence of intentional impedance contradicts the principle of solid grounding—where minimal impedance is crucial for effective fault management. In contrast, systems designed with intentional impedance would not be considered solidly grounded, making the choice regarding impedance the correct one as the characteristic that does not belong to a solidly grounded electrical system.