Very neatly done inside the Load Centers with the Grounds and neutrals -- shows your patience and perfectionism!

Very nicely done sir. Especially for a diy. Clean work.

Best explanation I've seen. Needing info for such setup - many 🙏👍

Thank you for information

Excellent tutorial and explanation. I'm doing the exact same set up, but also have parallel runs for the service. Very helpful!

Nicely done. I have just installed the same switch.  Cummins installation instructions are not bad, but not great. I also installed a surge protector at the transfer switch as well as at both 200-amp subpanels.

Thanks a lot for this you just helped me quote my first 400A ATS install. Couldn't find online any drawings!

parallel path if there's a short. you got to keep em seperated.

Impressive.  Pretty advanced for a DIY.

Nice.  Looking to enable solar along with grid and generator  i have a 400A manual transfer switch at the moment and a 50KW diesel generator.  Works great but want to reduce my power bill with Solar and batteries  have not found many switches capable of supporting the full 400A.

🙏🙏🙏🙏🙏🙏👍

That's a small generator feed for 400 amp...i hope you have proper load shedding installed

You are not an electrician,  but you did good! Looks good!  The phrase 4 o is really 4 ought. Or 4/0. The conduits the connect from the new disconnect to the the sub panels should be 2 in. Good job again!

You explained the easy part lol what about all of the connections between the generator and the transfer switch on the terminal block?

Very nice install for a DIY!!  Any problems with inspections or permits since you did it yourself?  I know you used 4/0 aluminum and said you wished you used copper.  I personally would love to use copper for all of it but price is almost prohibitive because of price. That aluminum is actually easier to bend that the smaller copper because Al is so much softer material. I also noticed that you had 2 wires per terminal on the meter. Did the utility co give you any problems about that?  In my part of the country that double wire wouldn’t fly. Poco likes wire on individual terminal. Is there an exterior 400a disconnect?  That’s another requirement so first responders can isolate power during an emergency.  They still  require it even though you have the service disconnect right on the other side of the wall. As another person said this was for sure an advanced diy install. Good looking job!

Service entry aesthetics:    (Jeremy Your meter panel is how it should be done)
1. I'm all for NEC code changes for safety, but why can it be done in an aesthetic and
   pleasing manner for the exterior of residential buildings?
2. Why aren't architects demanding the electrical manufacturers address exterior service disconnects
3. How about an external small mechanical disconnect that uses a spring cable to disconnect the breaker or
    knife switch on the inside of the building. Of course certified and listed.
Residential 400 amp residential service looks like a small industrial building.
Very large meter panel. Very large disconnects switch box, and a 200 amp panel box, and a second 200 amp panel box in the inside of the residence.
Then down the road were coming up with smart panels even larger housings. How about adding to the engineering staff a design engineer and architect so their voices can be added to the design process and residential stop looking like small industrial plants.

How were the DC connections?  I haven't found a video explaining how those were done or what to keep in mind when making those terminations.

How did you make your control wires going from the generator to ats I can’t figure that part out

Okay where does his emergency power or generator power come into the transfer switch ?

from transfer switch can you run to (2) 200 amp disconnects then into (2) 200 amp panels ?