Step potential - the invisible danger
Vehicles contact power poles more often than you’d think.
If you crashed into a power pole and a powerline was draped across your vehicle, would you stay in the car or get out?
If you’re confronted with a fallen powerline, always assume it’s live. It all has to do with step potential.
See step potential in action and how to avoid it in this short video:
Fallen powerline safety dos and don’ts
When a live powerline hits the ground, electricity passes into the earth and fans outwards, with the voltage reducing the further away from the point of ground contact.
If you have a foot in one zone, and your other foot in another zone, the voltage difference would travel through your body and give you a hazardous shock.
So if you’re faced with a fallen powerline in your immediate area, here’s what to do:
Powerline on a vehicle
Road traffic accidents involving powerlines or poles are more common than you think.
If you are unfortunate to be in a road accident that results in a powerline draped over or next to your vehicle, your actions are simple:
- Stay where you are and don’t open the doors or get out of the car.
- Call 000 immediately and wait for Western Power to make the area safe.
- If you’re unable to call 000, wait for passers-by to report the incident for you.
Powerline on the ground
If a storm, vehicle or tree has brought down a powerline next to you – or you accidently walk into an area close to a fallen powerline – follow these steps:
- Stop exactly where you are and don’t move. Remember, electricity wants to travel through a conductor, and human bodies are better conductors than the ground.
- Never walk or run away from the situation.
- If you can easily reach your phone without moving your feet, call 000 immediately and wait for Western Power to make the area safe.
- If you’re unable to call 000, wait for passers-by to report the incident for you. Remember, passers-by must stay at least eight metres away from the damaged powerline too.
- If you feel that you are in imminent or life-threatening danger by staying where you are, slowly shuffle clear of your current position, keeping both feet close together at all times. It is essential that you don’t contact the ground with feet apart at the same time.
It’s important to remember this simple advice if you come face to face with a powerline on the ground, on top of your car or in your immediate vicinity.