The minimum approach distance for unidentified dangling wires is?

The minimum approach distance for unidentified dangling wires is?

• A. 6 inches.
• B. 3 ft.
• C. 8 ft.
• D. 15 ft.

Answer: (D)

Unidentified dangling wires are treated as potentially energised at any voltage, so you need a conservative buffer to prevent contact or an arc flash. Fifteen feet provides a wide safety margin that covers the range of voltages you might encounter in a railroad environment and accounts for factors like arcing distance in adverse conditions, human reach, and the use of tools or equipment. If you can de-energize and de-activate the circuit under proper procedures, you should do so, but in the absence of known status, maintaining a minimum of fifteen feet is the prudent standard. Smaller distances risk electric shock or an arc reaching you or your gear, which is why the other, shorter distances aren’t considered safe defaults for unidentified hazards.

Unidentified dangling wires are treated as potentially energised at any voltage, so you need a conservative buffer to prevent contact or an arc flash. Fifteen feet provides a wide safety margin that covers the range of voltages you might encounter in a railroad environment and accounts for factors like arcing distance in adverse conditions, human reach, and the use of tools or equipment. If you can de-energize and de-activate the circuit under proper procedures, you should do so, but in the absence of known status, maintaining a minimum of fifteen feet is the prudent standard. Smaller distances risk electric shock or an arc reaching you or your gear, which is why the other, shorter distances aren’t considered safe defaults for unidentified hazards.