Quote:
Originally Posted by Scott Douglas
When I was young a cousin of mine went fishing on a private lake in Texas. Story goes that there was some kind of bridge or something that they passed under with the aluminum boat they were in. My cousin, Geoff, reached up to help guide the boat and was electrocuted when he touched the bridge which was steel. Somehow something got mis-wired and the bridge was 'HOT'.
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yeah. "Ground" is not automatically ground.
It's often several circuits connected to the same path of least resistance. The breaker box.
Something else along that same path can be considered "hot" and back-feed to a point inside above the final termination sink, i.e. the earth.
Pipes and copper rods are usually used
afaik but are not guaranteed.
I heard a story of some neighborhood household electrical problems in SF that were next to an electric train station. Big electricity. We are talking tens or hundreds of thousands of volts. There was an engineering ground problem. The earth in the whole vicinity became energized, which disrupted all the other grounds nearby.