Protective grounding: Suitable for three-phase power systems with neutral points not grounded. When the human body touches the conductor part or shell of electrical equipment, the current passing through the human body will be very small due to the much higher resistance of the human body than the grounding resistance, thus avoiding electric shock accidents. But its disadvantage is that in some cases, it may not be effective in preventing electric shock.
Neutral protection: Suitable for three-phase power systems with neutral grounding. When the casing of electrical equipment is charged, due to the connection between the neutral wire and the equipment casing, a circuit is formed, and the single-phase short-circuit current is large, which can quickly cut off the power supply and prevent electric shock. But its disadvantage is that it may not provide sufficient protection in certain situations.
Installation and maintenance suggestions for grounding protection
To ensure the effectiveness of grounding protection, a series of measures need to be taken:
Choose wire materials with reliable quality and good weather resistance to reduce the impact of natural factors on the wire.
Ensure that the wires are kept at a safe distance from the ground and avoid contact with obstacles.
Regularly inspect and maintain suspended electrical wires, promptly identify and address potential safety hazards.