Out here, anything relating to generation is a commercial inspection and has to be done by a licensed electrician…….only if the structure is connected to the grid. If not, guys can do whatever they want but maybe a building inspector would catch something.
It’s only happened twice to me where I’ve found a guy doing this, but it can get expensive for a guy that’s back feeding the grid during an outage. I cut them off the grid. The last one, I cut down his primary HV tap at the road, cut the transformer free and took the meter. He was fueling his generator for almost 3 months before he was reconnected. Had to hire an electrician to pull a permit for a safety inspection….which failed miserably. Paid for a brand new $4000 transformer, $180 meter, and the time the crews charged to rebuild his tap. Plus the electrician expenses for rewireing his red neck wire job.
Some kind of payback? If I remember right, during an outage both sides are supposed to be grounded before work begins so back feeding won't kill linemen. Back feeding may already hurt the back feeder if he is supplying multiple structures and when you short him out. Should blow the transformer fuse at least? or the main? or the generator breakers?