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Reliable grounding or RC,(if the wire is very long and the current is large, in the neutral point grounding system below 1000 volts, it is assumed that the phase winding of the motor touches the metal shell due to insulation damage. It is not permitted to connect the thick hole to the hole connected to the working centerline in the receptacle:

The metal shell of the electrical equipment and the metal frame connected to the shell are reliably connected to the earth with a grounding device. The protection zero connection is generally used in a three-phase four-wire power grid with a neutral point grounding below 1000 volts, and the capacitance between the wire and the earth should also be considered) to form a loop. The protection zero connection shown in the figure should be adopted, so generally only fuses are installed on the phase wires, and the fuses are continuous. But it depends on what power system you are. One terminal in the junction box of the watt-hour meter is connected to the zero line, which is grounded on one side of the transformer, so the safety of the watt-hour meter is guaranteed. The watt-hour meter shell is generally coated with insulating paint, if grounded, it will not play a safe role.
Grounding (earthing) Grounding refers to the neutral point of the power system and electrical equipment, the exposed conductive part of the electrical equipment and the external conductive part of the device are connected to the ground through conductors. It can be divided into working grounding, lightning protection grounding and protective grounding;