To determine the voltage of overhead electric power lines, you should contact which source?

• A. Local electrical authority
• B. Local utility
• C. Supervisor
• D. Safety officer

Answer: (A)

Know the exact voltage before you work near overhead lines. The best source is the local electrical authority because they maintain the official, up-to-date records of line voltages for the area and provide the safety guidance tied to those voltages. You can’t determine voltage reliably by sight or assume it from line size or insulation—the authority has the precise values and any special conditions that apply to those lines, such as required clearances or isolation rules. A supervisor or safety officer can help coordinate and ensure you follow the right procedures, but they don’t supply the official voltage data themselves. The local utility may operate the lines, but the authoritative voltage information comes from the electrical authority.