Single Conduit Between Main and Transfer Switch?

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300sniper

New User
Location
California
Occupation
Construction Manager
I have a 320/400a meter main, with two 200a main breakers feeding two 200a sub panels, one for the garage, and one for the main part of the house. I am about to add a 24kw generator and ATS. I only want to back up the house panel.

My question is, can I run a single conduit from the main to the transfer switch, run conductors from my main breaker to the ATS, then back through the same conduit to the main panel, then back to my house sub panel? I am confused with that would require upsizing the conductors, or if de-rating even applies in this situation.
 
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