Is it true that service conductors installed in overhead masts traveling through the eave of a building are considered outside?

Service conductors that are installed in overhead masts passing through the eave of a building are indeed considered outside conductors. This classification is important due to safety regulations and handling requirements outlined in the National Electrical Code (NEC). The NEC recognizes the area outside the walls of a building as a distinct environment where different rules apply, particularly regarding short-circuit protection and grounding.

When service conductors enter a building through an eave, even though they temporarily pass through the structure, they retain their status as outside conductors until they are terminated at the service equipment. This is critical because outside conductors must comply with specific installation methods and safety provisions to protect both the building structure and the electrical system within. Understanding this principle helps ensure that installations follow NEC guidelines, contributing to the safety and reliability of electrical service in buildings.