What is the Minimum Approach Distance?

• A. The closest distance personnel or equipment may approach an energized or de-energized but not grounded circuit/apparatus
• B. The distance to substation
• C. Track clearance
• D. Distance between pantographs

Answer: (A)

The minimum approach distance sets the safe boundary between you (or equipment) and exposed energized electrical conductors or circuit parts. It is the closest you may approach without additional safety measures, helping prevent electric shock or arc flash by guaranteeing a clear separation. This boundary applies whether the circuit is energized or de-energized but not grounded, because the hazard from exposed parts remains unless an appropriate isolation and control measure is in place. The other options describe different kinds of distances that aren’t about the electrical safety boundary for approaching energized parts (substation distance, track clearance, or spacing between pantographs).