Yup I can't wait to see this ATS, and generator for that matter. Should be fun. [Linked Image]

Expanding shouldn't be an issue. When this home is done, its done... there will be nothing other to add. Shops, and garages are setup.

The ATS will have the disconnect built in. The 200a have a main breaker... this 400 should be about the same.

Splitter trough, I like that.
[Linked Image from hammfg.com]

Shake n Bake