I am trying to determine which would be easier for myself, installing a panel inside or outside of a building. The building is a 16x30 pre-built structure. The owner wants to add a 100amp panel and a few circuits to for the building. When I think of grounding the building it seems easier to mount the panel on the outside, but when I think of running the circuits it seems better to mount it on the inside. Either way I want it to pass inspection without the inspector having. Any advice on both method or one? Thanks ahead of time....