This type of earthing is called TN-C-S or PME, and should be recorded as such. As you should be aware, the neutral conductor is tied down to earth at every joint made underground by your DNO. Although not widely adopted until the 70's the introduction of PME was piloted in the 1930's. It saved...
(Message form my wife who cares for autistic children and adults)...
What a brilliant idea static zap. I'll be getting Aldo (MrLights) to wire up something like that for one of my clients :)
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