Perfect. For the record, I only called the stuff out and told him to get a licensed professional electrician. In Florida needs a clean 4-Point form to get his insurance, so, unless he calls another inspector who doesn't know what to look for, he's stuck with me,No it's not permitted to use a #1/0 conductor for 200 amps in this application. As Retired said state what you see and walk away, this is not a code inspection and likely outside of your SOP to perform one with specific violations. And as far as helping this client out there are so many violations with this installation anything other than a thorough inspection and corrections by a licensed electrician is putting your client in danger. You're not helping him if he actually tries to fix this mess himself based on your observations.
The "electrician" he's now using told him it's OK to splice like that and I just wanted to confirm my own research with those actually licensed in the field. Most times I can pull a specific paragraph reference and the conversation ends but this one isn't so cut and dry.
Thanks