I installed 2 60 amp 3 phase receptacles in my warehouse in CA on a Friday a few months back.  On the following Monday morning I had 3 trucks from the city and utility department taking pictures and documenting everything.  They threatened to shut down power but I have a monitored fuel tank in the back so the state law prevented that from happening.  My power usage went from 4 kW to 44 kW and I do have a smart meter at the building, so that's what triggered it.  I have attempted to get a permit after the fact but ran into issues with that so they will probably come by one day to disconnect everything.  I just applied for 1 MW of power at a building in WA so I hope that goes smoothly, currently running 40 kW there without incident.