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Is there a reason for unusual voltages measured to ground when connecting Buck and Boost transformers according to single phase diagram #4?

Stray voltages to neutral or ground from a Buck and Boost Transformer connection
Product Line:
Low Voltage (LV) Transformers
Applies to Buck Boost Transformers by SquareD/Schneider Electric
Magnetic voltages from an ungrounded single phase Buck Boost Transformer connection
Wiring diagram #4 indicates a single phase buck or boost scenario in which there is usually no ground reference. Unusual voltage readings from the circuit to ground are not indicative of a problem and may be ignored.  The important voltages are found between the LV and HV inputs or outputs of the diagram.
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