The disconnects are grounded via grounding locknuts. The voltage is 240, and no remaining KO rings exist, so that is sufficient. A grounding lug would have done the job correctly.
The thing that puzzles me is that, if the neutral & ground are isolated in the panelboards (I haven't looked yet), and the Neutral/Ground connection is floating in the disconnect enclosure, where is the parallel path for neutral current.
I will try to draw & post a diagram(eventually).
This is in the basement of a restaurant.
Shouldn't SER cable should be prohibited?