What type of grounded electrical system has a direct electrical connection to ground with no intentional impedance?

A solidly grounded system features a direct electrical connection to ground, providing a low-impedance path for fault currents. This type of grounding is crucial in electrical systems because it ensures that in the event of a fault, the current will have a clear and immediate path to the ground, enhancing safety and reducing the risk of electrical shock or fire.

In a solidly grounded system, there is no deliberate impedance introduced, allowing for the maximum fault current to flow, which aids in the rapid operation of protective devices (like circuit breakers or fuses) to disconnect the faulty part of the system. This grounding method also helps stabilize the voltage of the electrical system, minimizing voltage fluctuations.

In contrast, an impedance grounded system introduces a specific level of impedance between the ground and the electrical system, limiting fault current and often used for specific applications to reduce the impact of ground faults. A resistance grounded system uses a resistor to limit fault current while still allowing some flow to ground. An ungrounded system operates without a ground connection, which can create hazards by allowing terminal voltages to float, potentially leading to insulation failure.

Therefore, the choice of a solidly grounded system emphasizes immediate and effective fault management and safety in electrical installations.