If a control transformer secondary voltage is not grounded at the source, what might occur?

Grounding a control transformer’s secondary voltage is crucial for providing a stable reference point and helping to avoid floating voltages. When the secondary voltage is not grounded, it can lead to instability in the voltage output. This instability may manifest as voltage fluctuations that can be caused by varying load conditions or external electromagnetic interference. Additionally, floating voltages can reach higher levels due to capacitance effects or inductive coupling from nearby sources, which can result in erratic behavior in control circuits, potentially leading to malfunctions or safety issues.

A grounded system ensures that the secondary voltage remains within predictable limits and reduces the risk of shock hazards or equipment damage. Therefore, without grounding, the secondary voltage can be unpredictable, making stability a significant concern.