Had one where I installed 4/0 SER that I had to a 150 panel. Inspector said I had to install a smaller cable as the panel could not take all the power the 4/0 could supply. I asked why the main breaker in the panel wouldn't trip if it was drawing that much. He said "I will let it go this time".
Same job he said I had the grounds from the water line and rod reversed in the disconnect. I asked what difference did it make. He said he did not want the fault current going thru the buss, it wasn't rated for that much current.
