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what is known as a central earthing point. You bond each and every device you've got to one point and then earth it. Now, how you earth it down to ground. For me, I've got a three meter copper rod, a bit of copper tube in a plumber's used for water bright pipes, hammered into the ground with a tampon and then a cable then to that central earthing point. Now, depending on the structure of your building you live in, that could be difficult. Alternative are available, but I'm sure if you look on the net, there are viable options about doing it, like buildings which of through CERN height do have lightning rods.
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