|
 |
| Downed Power Lines and Step Potential |
|
| Step potential is the voltage difference between the two feet of a person standing near an energized, grounded object. This invisible hazard can be deadly for anyone in the vicinity of a downed power line. |
| For more first responder safety information and to order our FREE safety kit, visit the SCE e-SMARTresponders website. |
|
|
|
|
| How Step Potential Happens |
| When a power line contacts the earth, it carries electric current into the ground. If the voltage is strong enough, the current will spread out from the point of contact. Voltage will be highest at the point of contact and will diminish with distance from that point. Voltage levels may vary with ground conditions and the conductivity of the soil. |
| If you walk across this energized area, the voltage between your feet will differ. Electricity will use your legs as a path to travel from an area of higher voltage to an area of lesser voltage, resulting in electrocution or serious injury. |
| The Shuffle Technique Is Key |
| If you are in the vicinity of a downed power line, you must shuffle away with small steps, keeping your feet close together and on the ground at all times. Do NOT take large steps, and do NOT allow the heel of one foot to pass the toes of the other. These precautions ensure both feet remain in areas of similar voltage. |
|
|
| Continue shuffling until you are at least 100 feet away from the line and any objects that may be energized. Always maintain the maximum distance possible from any downed line. |
| Distance Is Your Best Protection |
| Downed power lines can be energized even if they don’t hum or spark, and even lines that appear dead could become re-energized at any moment. If you know or even suspect that a power line is down, contact SCE immediately and take these precautions: |
| • |
Keep yourself, the public and all vehicles and equipment at least 100 feet away from ALL downed power lines and objects that may be energized. Maintain a safety perimeter to keep the public far away from the area until SCE personnel give the all clear. |
|
| • |
Do NOT approach anyone in contact with a downed power line or energized object until the SCE representative confirms the line has been de-energized. |
|
| • |
Water conducts electricity. Do not touch or step in water near a downed wire, as the area might be energized. |
|
|
| Would You Like to Know More? |
| Additional utility safety tips, case studies, instructional videos and educational tools can all be found, at no charge to you, at sce.e-smartresponders.com. |
|
