Im only familiar with the buildings ive been in and it seems thst maybe 200' is where there is more oanels xfmrs and panels to that area.. im sure there are many that ate further. But if its the distance that a conduit is no longer a egc. Then couldnt something else be done. That just sounds lije too far. Which means the vd wire will only inxrease insize then the ground then the pipe and the cost and the time. Could it even be inspected correctly. If it doesnt apply to derating then someone will say that run is derated. Uts not for vd.