A three-phase, four-wire, wye-connected system is typically grounded at which point?

In a three-phase, four-wire, wye-connected system, the typical grounding point is indeed at the point where the transformer leads join, which is the neutral point of the wye configuration. This grounding method provides a reference point for the system voltage, ensuring that the phase voltages remain balanced and stable. By grounding the neutral point, it helps to protect electrical equipment from overvoltages and allows for the safe operation of electrical systems.

Additionally, grounding at this point supports the system in safely clearing faults, as it allows for current paths during ground faults, enabling circuit protection devices to operate effectively. This grounding point also ensures that the system complies with electrical codes and standards, which often require grounding for safety and operational reliability.

In contrast to the correct answer, other options represent different configurations or scenarios that do not align with standard practices for grounding a wye-connected system. For example, grounding in the corner of a three-phase delta configuration does not provide the same advantages as grounding the neutral point of a wye system, and stating that a system is not grounded would disregard critical safety protocols followed in electrical installations.