Since when have supply-side interconnections been "proven" to be unsafe? What is this proof you speak of? How is it unsafe for the utility? You can't just make a statement like that and not expect to be called out on it.Unless it has a single main breaker it " is" outdated, yet still legal.( having one main is safer all around.) In a neighboring jurisdiction, they make you replace all zinsco panels if you have to alter or add a new breaker. I did not agree with them, but it's in the Coty ordinance, which is allowed to be more restrictive. In my last AHJ they disallowed supply side connections. Perfectly within. The AHJ's rights, to do so. Especially since they have proven not to be as safe. Legal but not the safest or the best for the utility.