:
(1) If there are devices such as water-heater, air-conditioner (air-conditioner) installed inside the customer's house, the grounding should be arranged by supplying electricity from a separate suitable circuit for such devices.
(2) If the electrical material mixed with different types of metals is brought to the customer, a three-pin plug socket should be used and such plug socket should be connected to the earthing system.
(3) The grounding system installed at the customer should be in accordance with the technical method.