This is the only thread for earthing so I would like to use it for my example.
Went to a house yesterday where the guy was getting shocked when touching the gate motor bracket, fridge and anything else "earthed"
There was no municipal earth supply but I found a connection to an earth spike from the earth bar and a second connection between earth and neutral, seems ok?
Well it is as long as neutral is neutral but in this case the municipal supply had been reversed and the neutral was now live. Seems the earth spike was not as effective as required and the house was alive.