On small stuff a sit down with the Code book usually resolves the problem. I have a local review board, and there is always the right to appeal to the state.
Big headache comes from the general contractor that doesn't know the electrical code and pushes the electrician to create a violation.
Such as; join two existing buildings together, each with their own 400 amp service, same voltage and phasing. Now make it comply with the code.
I suggested, increase one and back feed the other; put in a single service disconnect and feed both. All rejected as too expensive since the job was done.
Actual solution; appeal to the state for an exception. Both service are fed from the same transformer so that will be the disconnect "point" in case of fire. Put signs at both services.
AHJ (Me) puts a copy of the signed state release in the file and walks away from it.
Kenny Rogers Rule: Know when to hold 'em, know when to fold 'em, know when to walk away, know when to run.
