How many sets of service entrance conductors shall be supplied by a service drop?

The correct answer is that only one set of service entrance conductors shall be supplied by a service drop. This requirement is grounded in the NEC, which specifies that a typical service drop provides a single connection for the electrical supply to a building or structure. The service entrance conductors derived from this service drop are intended to bring electrical power from the utility to the main service equipment of the building, ensuring that the electrical service is properly delivered and connected.

When considering the needs of a standard residential or commercial installation, there is typically one primary connection point for the service drop, which feeds the main service panel. This arrangement is designed to simplify the management of electrical supplies, enhance safety, and conform to the established continuity of electrical distribution within a building.

In more complex scenarios, such as larger structures or certain specified installations, additional considerations might apply regarding the number of conductors needed. However, the focus of the question and the typical installation practices align with the understanding that an individual service drop generally supports a single set of conductors for the main electrical supply to a structure.