As a subcontractor, I am not on the job to do any further testing but the electrician on site is filling me in. The manufacturer set up an identical transformer in the same setup, they had current on the frame ground conductor, they rerouted this conductor and the ground current dropped.
The electrical contractor rerouted the conductor and the current dropped from 15.9 amps to 11.7 amps. At the factory, they were able to lower the amperage to 10.0 amps. The manufacturer feels this level of current is acceptable but not say why it is acceptable.
I asked the electrician to extend the ground conductor which would allow him to move the conductor in different directions and see if how the current changes.
The end user wants a letter from the manufacturer stating this is an acceptable level of current.
I would like to get back on site to load test the UPS and transformer and watch this current at different load levels as well as move the conductor as load levels are stepped up and see how that affects the current compared to the primary current..