The Shock Doctors explain in this video why you need to install a grounding plate in your home.
Why you need to install a grounding plate with a new Electrical Panel Installation?
The voltage has to be drained away to ground safely so it dissipates into the ground. It’s a principal of nature. If you don’t have one of these good grounding plates in, there is a potential that electricity will seek another path to ground, namely through you when you are at the kitchen sink.
This is required to be buried 24 inches below the grade and there is a wire that attaches to the bronze connection and goes into the panel. It’s protected by location because it is buried.
After digging down 24 inches and running the wire the ground plate is ready to be installed..
If there was ever a fault in the house, for example if they ran over a cord or cut the line by accident the electricity would go through the least path of resistance which is now your body. If that ever happened, now it is going to go through this cord and wire and into the ground safely.