My developer connects one end of steel wire of the incoming TNB SWA service feeder to the earth terminal block in the db. I understand this is for safety of the electrician should there be any puncture/leaks to the SWA cable.

But, I was just thinking let's say if there's leak and since the earthing is all shared, does that mean all the electrical appliances with metal casing are all charged - lethal to touch?

Needs sifu opinions