Posted by BarnyardEngineering on February 04, 2019 at 07:59:42 from (173.186.244.245):
In Reply to: Backfeeding posted by Bob on February 03, 2019 at 15:30:11:
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Whatever is connected is energized. Depends on how much damage the storm did to the lines.
Electricity doesn't flow just one way. It can go "in" any hole and come "out" any hole. That's how backfeeding works. Instead of the electricity coming in through those wires from the road, it is coming in through one of the electrical sockets in your house, courtesy of a generator and a "suicide cord," which is an extension cord with two male pronged ends.
The problem is that unless you disconnect them, the wires from the road become a new "out" hole. They go to a transformer which normally reduces the voltage from the overhead wires down to the 240V for your house. When those wires from your house become the new "out" hole, the transformer works in reverse, changing the household voltage back to high overhead wire voltage.
It only takes a fraction of an Amp to kill someone. Our bodies have very high resistance which is why people often survive contact with household voltage. However, the voltage on those overhead wires is so high that even with a wimpy little generator, that fraction of an Amp can flow through a human body to kill a person.
Ideally there are enough other transformers and houses connected to the lines to overload a backfeeding generator and shut it down, but there are circumstances where there isn't any other load on the wires, leaving them live and deadly while the backfeeder sits in their house watching TV, not realizing there's a problem.
We had an outage last year in my neighborhood, where I live there are lots of houses, with several connected to each transformer. Someone up the street was backfeeding their house with a generator. I heard the BANG when the linesmen grounded out the line. So even though there should have been several houses killing that generator, it was working just fine.
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