A friend of mine ownes a residence with two non-conforming units (one, a small apartment, the other, a small office space his brother-n-law uses for his business). These units comprise the first floor. The second floor is his apartment where he resides. The panel is located in the first floor office. For whatever reason, the brother-n-law refuses to allow him access to the office and hence, the panel. He recently asked me if the panel could be relocated to the exterior. With the non-conforming issue, he doesn?t even have the choice of doing it the right way (three meters, corresponding disconnects, and main lugs in each unit.). But, just to at least give him more convenient access to the panel, is it permissible to locate a rain tight main breaker panel on the exterior or should he just address his relationship with his brother-n-law? Thanks.