A solidly grounded system is one where one of the current-carrying conductors is intentionally connected to the earth.

A solidly grounded system is indeed one where one of the current-carrying conductors, typically the neutral conductor, is intentionally connected to the earth. This grounding method provides a direct path to the ground, which helps to protect electrical systems and equipment from overvoltages caused by lightning strikes, power surges, or faults. By having a solid ground connection, it ensures that in the event of a fault, protective devices like circuit breakers and fuses can operate effectively to isolate the faulted portion of the system, thus enhancing safety and reducing the risk of electric shock and fire hazards.

In solidly grounded systems, the connection to the earth minimizes voltage rise during temporary faults and provides a low-impedance path for fault currents, which aids in fast clearing of electrical faults. This intentional grounding is crucial in maintaining system stability and protecting equipment, demonstrating why the statement regarding solidly grounded systems is true.