One should never work around downed power lines unless you know the line is deenergized and protective grounds placed on the lines by a qualified person. That being said, the relatively low voltage lines (120/240v)such as those serving residential homes typically are not of a concern for step potential. It is the higher voltage line 7200 volts and above that can cause step potential; however, these lines are protected by sensing relays that detects ground current or over current conditions and quickly deengizes the lines via fuses or circuit breakers. On occasion though due to various reasons these protective devices fail and the downed power lines can remain energized. Most often times there are visible indications the line is energized: arcing/sparking, smoke coming from the ground at point of contact or melting of the line, asphalt or other objects. Times the lines remain hot but with no indications is when danger of step potential is a concern as the downed line will energize the surrounding ground. Nearly always the first indication is the soles of your feet getting hot. It is at this time that step potential is a real threat. Voltage at the point of ground contact is the highest with decreasing voltage as distance from line increases. This is step potential: one foot on the ground closest to line while the other foot is on the ground a couple feet further away. With any difference of potential, current will flow and probably from foot, through body and out the other foot. If you find you self in this situation do not walk or run, repeat do not. You should hop away from the line to decrease this step potential hazard.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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