I am an electrical designer in Mass, and I am seeing a lot of existing conditions at homes where, for example, a residential house has a main service of 400 amps, and the main disconnect is a service rated 400 amp ATS, but the generator is only a 200 amp generator with no generator panel. So basically it's a whole-house backup, but with only half the available amperage as the main service. I know that most residential houses do not use nearly as much amps as we have to design for, but is it a code violation to have a setup like I mentioned? I was brought on to a design/build project to review the installation where the EC is doing something similar. Where in the code does it say he can or can't? Any help would be appreciated.