The 2 inch concrete encased you mentioned is in 230.6. Scope of NEC 2014 section 230 below for service conductors and equipment for control and protection of services. I have feeders inside buildings. This section is Not for feeders. I don’t see any section like that for feeders or outside feeders. Their is not outside definition eitherIDK for certain on that. 2 inch encasement of service conductors or other similar situations like being in a vault generally is acceptable to consider them outside the building. But this mostly pertains to electrical considerations and not everything else that other building codes uses to consides a separate building or effective equivalent.