NEC 2005 800.113
Exception No. 2: Listing and marking shall not be required where the length of the cable within the building, measured from its point of entrance, does not exceed 15m (50ft) and the cable enters the building from the outside and is terminated in an enclosure or on a listed primary protector.
800.2 Definitions
Point of Entrance. Within a building, the point at which the wire or cable emerges from an external wall, from a concrete floor slab, or from a rigid metal conduit or an intermediate metal conduit grounded to an electrode in accordance with 800.100(B).
