What is often a requirement for residential underground distribution systems?

Conformity to local building codes is essential for residential underground distribution systems because these codes establish safety standards and regulations that must be adhered to for the construction and operation of electrical infrastructure. These codes are designed to ensure the safety of the public and maintain the reliability of the electrical system. Compliance with local building codes ensures that installations are conducted safely, preventing hazards such as electrical fires or exposure to dangerous conditions.

While other options might seem relevant, they do not specifically address the foundational requirements for underground distribution systems. For instance, above-ground installation for ease of access would contradict the nature of underground systems, and while licensed professionals are often required for electrical installations, the emphasis on adherence to building codes underlines the broader regulatory framework designed to protect both the public and the utilities involved. Similarly, the use of renewable materials is not a standard requirement for underground distribution systems, which focuses more on safety and compliance than on material sourcing.