Electrician's Licensing Practice Exam

Trees are not approved as service conductors according to the National Electrical Code (NEC). The reasoning behind this prohibition is based on safety concerns and the properties of trees as materials. Trees are organic materials that can retain moisture, which can lead to unexpected conductance and degradation over time. This moisture can increase the risk of electrical shock and short circuits, presenting severe hazards to both the public and the electrical system.

In addition to the moisture content, trees are not designed to handle electrical loads or provide consistent electrical conductivity. This lack of reliability and the potential for physical damage from environmental stresses such as wind, pests, and decay creates further risks. Therefore, the NEC explicitly prohibits the use of trees as conductors to ensure the safety and reliability of electrical systems.

While there might be regional variations or practices in some areas, the general consensus and guideline remain that only approved materials should be used for service conductors, which are typically standardized and made from metals, such as copper or aluminum, known for their conductivity and durability.