Power Line, Inconveniently on the Ground
High-voltage ground gradient hazards, step potential mechanics, and hop-or-shuffle escape
// IMMEDIATE ACTIONS
Execute these steps in order:
- 01 STAY AT LEAST 10 METERS (33 FT) AWAY
Treat every downed line as fully energized. Keep clear of lines, fences, and wet ground.
- 02 SHUFFLE FEET TOGETHER IF TRAPPED IN VOLTAGE ZONE
Keep feet pressed tightly together and shuffle across ground without lifting soles to prevent lethal step potential.
- 03 CALL 911 / 112 & WARN OTHERS TO STAY CLEAR
Alert emergency dispatch and utility grid operators to de-energize line before approaching.
// CRITICAL MISTAKES (DO NOT)
- ✕ Do not take normal walking strides or run away from a downed wireWHY: striding creates a deadly voltage drop between your feet
- ✕ Do not touch fences, guardrails, or trees near a downed lineWHY: they conduct high voltage for hundreds of meters
- ✕ Do not drive over downed cables.
- ✕ Do not touch someone who is in contact with a downed wire.
“Keep a 10-meter perimeter; if caught inside the gradient, shuffle with feet touching or hop with both feet together.”
Utility transmission and distribution cables carry alternating potentials from 400 Volts (low-voltage neighborhood feeds) up to 380,000 Volts (high-voltage transmission grids). When severe storms, vehicular impacts, or tree falls drop an energized cable onto the earth, the ground acts as an electrical resistor.
The Physics of Step Potential
Electricity spreads through the ground radially from the contact point, creating concentric ripples of decreasing voltage (a voltage gradient funnel or Spannungstrichter).
If a person takes a normal walking stride near the cable:
- The front foot lands in a high-voltage ring (e.g., 8,000 V).
- The rear foot remains in a lower-voltage ring (e.g., 3,000 V).
- The resulting 5,000-Volt potential difference (step potential) forces electrical current to enter through one foot, travel up the leg, across the groin, and down the other leg to earth, inducing severe deep-tissue electrothermal burns and immediate cardiac ventricular fibrillation.
By keeping your feet pressed tightly together and shuffling without lifting either shoe off the soil, both feet occupy the exact same voltage line, preventing current from traversing the body.
112 reaches fire and emergency medical dispatch directly. 110 is police.
Additional safety instructions and adjacent hazard knowledge.