1 gen-set I had to straighten out was a generac 17kw unit an installer had placed 18inches from the dwelling...which is allowed with their listed unit...but he had the exhaust end pointing at the dwelling!

The gas was hard piped into the unit without the 12inch flex hose.

The SE rated transfer switch didn't have the GEC relocated to it.

The grounds and neutrals were not seperated at the now sub-panel.

They used 18-6 bell wire for the controll, utility sense wiring.