What term refers to the overhead service conductors from the last pole to the service entrance at a building?

The term that accurately describes the overhead service conductors extending from the last pole to the service entrance of a building is "Service Drop." This designation is recognized in the National Electrical Code (NEC) as it specifically pertains to the conductors that connect the utility supply to the service equipment at the customer's premises.

A Service Drop is characterized by its purpose and configuration, providing a critical link for distribution of electricity. It typically consists of at least two conductors and is designed for overhead installations. This terminology is well-defined in Article 100 of the NEC, which clarifies its role within the overall electrical service setup.

The other terms mentioned do not distinctly convey the same concept. "Overhead Line" is a more general term that refers to any electrical line suspended above the ground and does not specify the connection to a building's service entrance. "Aerial Service" may be used in some contexts but does not have the precise definition and application that "Service Drop" has within the NEC. "Drop Line," while it might imply a connection, lacks the formal recognition and specificity utilized in electrical service terminology.