Which hazard must be considered by the first arriving engine related to lines?

• A. Overhead wires
• B. Underground gas lines
• C. Water main breaks
• D. Power lines on the ground

Answer: (A)

Electric hazards from lines are a top priority for the first arriving engine. Overhead electrical lines create an immediate, potentially deadly risk because electricity can travel through water, damp surfaces, or conductive equipment, even if the line looks distant or intact. The engine must identify any overhead power lines, establish a safe exclusion zone, and avoid touching or operating near them until utilities confirm the lines are de-energized. Downed or damaged lines can energize fences, vehicles, and standing water, so treating lines as live and keeping crews well clear is essential. While underground gas lines and water mains are important hazards in their own right, they pertain to different risks (gas leaks and water supply issues) and do not represent the immediate, universal risk posed by overhead lines that first-arriving units must address. Power lines on the ground can be dangerous, but overhead lines are encountered most often and require proactive avoidance and safe distance right away.