At a crash scene with downed lines, which step establishes a safety perimeter?

• A. Instruct Occupants to Exit Slowly
• B. Attempt to Move Lines with a Nonconductive Object
• C. Begin Extrication Procedures
• D. Mark Off a Danger Zone Around the Downed Lines

Answer: (D)

Keep people away from energized lines is the top priority. Downed power lines can energize vehicles, water, or the ground, and the risk of electrocution is high even if you’re not touching the wire. The first step is to create a safety perimeter or danger zone around the scene and mark it clearly so bystanders and responders don’t come into contact with any energized surface. This boundary gives you the working space needed to assess the hazard and coordinate with the utility company to de-energize the lines before any rescue steps proceed.

Instructing occupants to exit slowly isn’t sufficient because the danger may not be visible or predictable, and delaying action can expose people to shock or arc risks. Attempting to move lines with a nonconductive object is unsafe; energized lines can arc through air or ground unexpectedly, and a nonconductive tool doesn’t eliminate the danger. Beginning extrication procedures too soon can put responders in contact with the hazard or interfere with a proper de-energization plan. Establishing the danger zone first ensures rescue work is conducted safely once the lines are controlled.