Which of the following is NOT one of the tree and electrical system characteristics influencing tree-related service interruptions?

The correct answer identifies tree height as not being one of the tree and electrical system characteristics that directly influence tree-related service interruptions. While tree height is certainly an important characteristic in relation to potential contact with power lines, it does not specifically represent the conditions or properties that directly affect how tree-related interruptions occur.

In contrast, the voltage gradient is crucial as it relates to the potential difference that can cause electricity to arc, which is critical when assessing how trees interact with electrical systems. Stem diameter is relevant because the thickness of a tree can influence the severity of the damage caused when a branch or the tree itself makes contact with power lines. Lastly, tree species can play a role in determining growth patterns, branch strength, and susceptibility to disease, all of which can influence how trees interact with electrical systems.

Understanding these characteristics helps arborists to manage trees effectively near electrical infrastructure, thereby minimizing potential service interruptions.