What is the minimum approach distance for AMT-2 qualified employees working with conductive tools or equipment around Third Rail?

• A. 8 ft.
• B. 4 feet.
• C. 3 ft.
• D. 6 inches.

Answer: (B)

Minimum approach distance is the safe clearance you must maintain from a live third rail when using conductive tools or equipment. For AMT-2 qualified employees, that distance is four feet. This gap reduces the risk of electric shock or an arc forming if a tool slips, swings, or is deflected toward the rail, and it accommodates variations in moisture, contamination, and operator movement that can lower insulation performance. The third rail carries high voltage DC, and arcing can occur across surprisingly small gaps, so keeping four feet away minimizes the chance of a current path reaching you. If you can’t maintain that distance, you must de-energize and isolate the third rail or use appropriate barriers and nonconductive methods before proceeding.