Was the phase-to-common-ground method an improvement over the phase-to-separate-ground method?

The phase-to-common-ground method represents a significant advancement over the phase-to-separate-ground method due to its ability to simplify grounding systems in electrical installations. By using a common ground, the method reduces the complexity associated with maintaining multiple separate grounding systems. This can lead to improved safety, enhanced equipment performance, and lower overall installation costs.

In contrast, the phase-to-separate-ground method often results in an increased risk of ground potential rise and more complicated fault conditions. This can create challenges in diagnosing and managing issues within a system, which can lead to increased maintenance requirements and associated costs.

The common-ground approach also allows for better coordination in protective relaying and offers improved noise reduction in sensitive electronic equipment, which makes it a more effective choice in modern electrical design. Thus, it is recognized as a significant improvement over the previous method.