I am responsible for inspecting an installation. The panelboard covers do not fit. When the outer door is open, there is a gap between the outer cover and the inner cover. I am sure this indicates the panel has not been installed correctly. I would like a code reference that requires this to fit tight. The gap is probably in excess of 1/8". It was more like a quarter inch and they tweaked it and I was sent pictures. Thank you for your help. This is a Siemens single phase 200A surface mount panelboard - new. The 800A panel in the basement also suffers from gaps - perhaps 1/16". Again, the problem was "corrected" and I was sent pictures. I will be going out next week. Thank you.