Why are service conductors not considered tap conductors?

Service conductors are not considered tap conductors primarily because of their role in the electrical system. Service conductors are the conductors that extend from the point of supply, which may be a transformer or utility service, to the service disconnecting means. They connect the utility's infrastructure directly to a building's electrical system.

The significance of the point of supply lies in the fact that service conductors are established as the primary conductors that deliver electrical power directly to the service equipment of a building. They are designed to handle the full load capacity of the service, unlike tap conductors, which are used to draw power from a larger conductor while complying with specific ampacity and installation requirements.

Tap conductors, on the other hand, are typically smaller conductors that branch off from larger, primary conductors and are intended to feed other loads rather than serve as the main power source. Because they are meant to supply power to secondary circuits from a larger conductor, tap conductors have different regulations and limitations compared to service conductors.

By understanding the distinctions in function and regulation between service conductors and tap conductors, one can appreciate why the classification of conductors is relevant in ensuring safety and compliance with the National Electrical Code (NEC).