why electricity needs to be earthed
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You want most stuff that might touch other stuff to have roughly the same amount of charge. If you don’t ground something and it builds up a really big charge, it will eventually touch something else, and when it does, that could be dangerous. It doesn’t so much matter that they all touch “the earth.” The important thing is that they all touch something in common. If you could wire everything that might potentially touch to each other, that’d be pretty much just as good as touching the ground, but that’s awkward, especially if the mailman later explodes touching your door.
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