I read a number of posts prior to checking out an installation I had been asked to verify. Thank you all for providing the resources. I was thinking about the issue of the bed shocking people.
And there was talk of a corner grounded delta system.
The shocks appeared to be due to a difference in ground potential. I am wondering if an improperly grounded transformer could be causing the difference in ground potential.
The zero point for voltage is not a constant. There is no absolute zero point. Voltages are always relative to each other. Even if you put a ground grid on the area a few feet away from an electrical substation, for example, there will be voltage differences along that grid. When different voltages are being grounded - which occurs when there is high voltage equipment - the ground will have voltage readings that look like any other kind of topographical map.
Anyway, too much theory.
If there is an issue of different voltages in a facility, I would check to make sure that the transformers are grounded exactly the way the manufacturer intended and that an ungrounded delta primary hasn't been grounded in a place that was never intended. Driving that rod into the ground from a point that was never intended to be zero can cause smoke and black magic. (Hopefully, not literal smoke - but strange happenings that were never intended.)
Thank you for all your help in the past.
And there was talk of a corner grounded delta system.
The shocks appeared to be due to a difference in ground potential. I am wondering if an improperly grounded transformer could be causing the difference in ground potential.
The zero point for voltage is not a constant. There is no absolute zero point. Voltages are always relative to each other. Even if you put a ground grid on the area a few feet away from an electrical substation, for example, there will be voltage differences along that grid. When different voltages are being grounded - which occurs when there is high voltage equipment - the ground will have voltage readings that look like any other kind of topographical map.
Anyway, too much theory.
If there is an issue of different voltages in a facility, I would check to make sure that the transformers are grounded exactly the way the manufacturer intended and that an ungrounded delta primary hasn't been grounded in a place that was never intended. Driving that rod into the ground from a point that was never intended to be zero can cause smoke and black magic. (Hopefully, not literal smoke - but strange happenings that were never intended.)
Thank you for all your help in the past.