I'm not sure I follow the question, but every source that supplies a building or structure will Generally require means to completely disconnect all those conductors which provide supply including the grounded conductor.

The NEC is rather silent in regard to the distance travelled with in the building before a disconnect is installed. (not to say you should run extensive lengths). I believe the disconnect should be installed closest to the point of entry at the first readily accessible location.

Local Codes may have a thing or two to say on this matter.


230.70 General.
Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors.
(A) Location. The service disconnecting means shall be installed in accordance with 230.70(A)(1), (2), and (3).
(1) Readily Accessible Location. The service disconnecting means shall be installed at a readily accessible location either outside of a building or structure or inside nearest the point of entrance of the service conductors.
(2) Bathrooms. Service disconnecting means shall not be installed in bathrooms.