Unusual voltage power supply Measurements

[Proschuno]

I'm finding that the DC voltage produced by this voltage supply also has an AC component to it; this shows up on my oscilloscope and multimeter, about 100 volts exists between each HV terminal and earth ground, and about 75 volts between each HV terminal and the body, and 40 volts between the body and earth ground (the Ground terminal on the supply is connected to the body).

Then between each terminal and the 6.3 VAC were differing voltages, but I'll say all around 30 volts between AC to DC terminal, and also 30 volts between each AC terminal and body, and 60 volts related to earth ground.

Yet between the HV terminals is perfect DC. Why is this phenomenon happening?

[Impmon]

It happens. The third wire safety ground isn't connected to "ground", but rather the neutral of the three phase distribution system. If the loads are balanced, then the neutral is effectively ground. When the load is imbalanced, the neutral develops some voltage with respect to ground. If this condition persists, time to have a talk with your power supplier.

[Proschuno]

Thanks for the reply... going to take a good look at the fuse box.