Very incisive post @greenrun.
You are quite right, about the importance of earthing. Most electricians who like to cut corners on a job, fail to factor it into their services, leading to various forms of electric shocks and damages.
One of my Aunt's house was one nasty example of terrible electric wiring. Imagine a house were the toilet "flush", emits electric charges. The toilet flush o!
Then in the bathroom, the shower handle give's any and everyone a dose of shockwaves, when the bathroom light is switched on. So, in order to avoid the shock, don't bath with the bathroom light switched on.
Very terrible scenarios. But i'm a witness (Not Steem's.....Lolz)