Home grounding provides a controlled path for fault current and helps protect people and appliances. A socket with earth contacts does not prove that a protective conductor is actually connected.
Tingling from the metal body of a washer, boiler or computer, two-wire circuits, and missing residual-current protection require professional inspection.
An electrician checks the panel, separation of neutral and PE bars, protective-conductor continuity, sockets, RCD operation and connection quality. Water or gas pipes must never be used as grounding.
Older homes may need three-core wiring, a dedicated PE bar, an RCD and correctly rated breakers. The final design depends on the building supply system.
