Amtrak Maintenance Level 2 (AMT-2) Practice Test

Minimum Approach Distance is the closest distance personnel or equipment may approach an energized circuit or an apparatus that is de-energized but not grounded. It defines a safety boundary to prevent electric shock and arcing by ensuring you stay far enough away from live parts, with the exact distance depending on system voltage and conditions, and guiding the use of barriers, PPE, or de‑energizing procedures. The other options describe different clearances not related to electrical approach distances: pantograph-to-support structure, winding separation inside a transformer, and track spacing for clearance.