What is the main difference between a "service entrance" and "service equipment" in Article 230?

The main difference between "service entrance" and "service equipment" as defined in Article 230 of the National Electrical Code (NEC) lies in their roles and definitions concerning the electrical service system.

Service entrance refers specifically to the conductors that connect the utility's system to the building's electrical system. This encompasses the cables or wires that deliver electrical power from the utility source directly to the service equipment. These conductors are critical for the transfer of electricity into the premises.

On the other hand, service equipment refers to the apparatus that is used to control and protect the electrical service from the utility. This includes not only circuit breakers and fuses but also the service disconnect switch and other devices that manage the incoming electrical supply. Service equipment functions to ensure the safe distribution of electricity within the building and includes elements that allow for disconnection for maintenance or emergencies.

Understanding the distinction between these two terms helps ensure compliance with NEC requirements regarding installation, safety, and maintenance of electrical systems.