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

The most reliable method to determine the voltage of overhead power lines is to contact relevant authorities. This is because power line voltages can vary widely and often exceed what is safe for personal measurement. Utility companies or local electrical authorities have the accurate tools and data to provide precise voltage information, ensuring the safety of individuals working near or around power lines.

In addition, consulting relevant authorities reduces the risk associated with approaching power lines directly, as using a multimeter or relying on colleagues could expose one to dangerous or even fatal electric shocks. Safety protocols and standards set by utility companies are designed to ensure that individuals working in proximity to electrical infrastructure do so with the correct information and safety measures in place. Therefore, authority contact is the best practice for accuracy and safety in this context.