How many earthing systems are available in the world?

Question

How many earthing systems are available in the world?
And how many people use them?

I have a complete information about earthing system and a kind of protective switch that called "FI". And not to mention I've got a PHD in Electronics.

But the point I want to know, is that how many protective systems are in the world to protect humans body, in the case of earthing systems?

Thank you for your answer!

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Answer 1

Sorry, but your question makes no sense. You must be translating to "Earthing" something else from your native language. Do you mean "Ground" (or Grounding) system, to protect from high-voltages?