What is the best method to identify the voltage of overhead powerlines?

Contacting the local electrical authority is the best method to identify the voltage of overhead powerlines because they possess the most accurate and up-to-date information regarding their infrastructure. Electrical authorities maintain records of powerline specifications, including voltage ratings, and can provide details that are not readily available through other means. This ensures that the information obtained is reliable and adheres to safety regulations, which is crucial for anyone working near or with overhead powerlines.

Consulting the job safety analysis is valuable for understanding hazards and safety protocols, but it may not provide specific details on powerline voltage. While using a voltage meter can measure voltage directly, this method can be risky without proper safety precautions and may not be feasible for overhead lines. Asking nearby residents may lead to inaccuracies, as they might not have the technical knowledge or may rely on outdated information.