NCCER Residential Wiring Practice Exam 2025 - Free Residential Wiring Practice Questions and Study Guide

The main function of a service entrance cable is to bring electrical service from the utility company to the building. This cable is a critical component of the electrical system, as it connects the external power supply directly to the meter and the main service panel inside the building.

Service entrance cables are designed to handle the voltage and current from the utility and are typically constructed to be robust and weather-resistant to ensure safe and reliable operation over time. By serving as the main conduit for incoming electricity, the service entrance cable plays a pivotal role in the overall electrical infrastructure of a home or building, facilitating the safe distribution of power to the rest of the electrical system.

Other options describe functions that are either secondary to the primary role of the service entrance cable or completely different from what it is intended to do, emphasizing the importance of understanding the distinctions between various electrical components.