Which grounding scheme features ground cables connected from each phase to a common ground?

The correct answer is based on the concept of grounding schemes in electrical systems. Common grounding refers to a configuration where each phase conductor is connected to a shared or common ground point. This approach helps in ensuring that all phases are referenced to the same ground potential, which can enhance safety and reduce issues such as ground loops or differences in ground potential that can lead to equipment malfunction or electrical hazards.

In contrast, single-point grounding typically involves connecting all ground circuits to one single point, which may not specifically refer to how phase conductors are grounded. Bracket grounding generally involves supporting or securing electrical busbars or conductors but does not align with the defined connection of each phase to a common ground. Multi-point grounding can involve multiple ground connections at different locations, which may not centralize the grounding of the phases as effectively as the common grounding scheme.

Understanding these distinctions helps clarify why common grounding is the correct choice, highlighting its role in providing a unified grounding reference for all phase conductors in an electrical system.