What is a requirement for the support of service entrance conductors in contact with a building?

The requirement for the support of service entrance conductors in contact with a building stipulates that they must be supported at intervals not exceeding 15 feet. This regulation is crucial for ensuring the safety and integrity of the electrical system. Adequate support prevents sagging, minimizes the risk of physical damage to the conductors, and reduces the potential for electrical hazards. By maintaining proper spacing between supports, the installation complies with the standards set forth in the National Electrical Code, which is designed to uphold the safety of electrical systems.

While other answers might suggest alternative practices, they do not align with the NEC's stipulations. Conductors cannot simply hang freely, even if they are insulated, as this could lead to wear over time and create safety hazards. Additionally, while the use of conduit can offer protection, it is not a blanket requirement for all scenarios involving service entrance conductors. Lastly, while securing conductors with screws may be used for securing equipment and other components, it does not specifically address the need for support spacing requirements. Therefore, the correct choice emphasizes the importance of proper support intervals as per the NEC guidelines.