![]() TN-C-S grounding method: part of N is separated from PE, which is a four-wire half system power supply method, which is used in places with poor environment. Since the three-phase unbalanced current and harmonic current flow when N is normal, the metal casing of the equipment normally has a certain voltage to the ground, which is usually used in general power supply places.ģ. Both the neutral point of the device and the metal shell are connected to N. ![]() TN-C grounding method: The letter C means that N and PE merge into PEN, which is actually a four-wire power supply method. Mainly used for data processing, precision detection, and power supply system for high-rise buildings.Ģ. The advantage is that there is no current in PE, so the potential of the metal casing of the equipment to the ground is zero. TN-S grounding method: The letter S means that N is separated from PE, the metal shell of the equipment is connected to PE, and the neutral point of the equipment is connected to N. This method is commonly used in high-voltage systems, but it is not suitable for low-voltage systems with large-capacity electrical appliances.ġ. The first letter T means the neutral point of the power supply is grounded, and the second T is the grounding of the metal casing of the equipment.
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