Three-phase four-wire system (L1, L2, L3, PE) - Solutions - Huaqiang Electronic Network

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1. The PE line, also known as the protective earth or ground wire, is used to ensure safety by providing a low-resistance path for fault currents.

2. In an IT system (Isolated System), the PE line functions as the protective ground, helping to prevent electric shocks in case of insulation failure.

3. In a TN system (Terrestrial Neutral System), the PE line serves as the protection neutral, connecting equipment enclosures to the grounded neutral point of the power supply.

4. When the transformer's neutral point is ungrounded, the metal casing of electrical equipment must be connected to ground through a protective grounding system, which is referred to as the IT system.

5. If the transformer's neutral point is grounded, the metal parts of the equipment should be connected to the neutral line, forming a protective zero system, commonly known as the TN system.

Understanding the differences between these systems is crucial for proper installation and safe operation of electrical equipment. Whether you're working with IT or TN configurations, ensuring correct grounding and bonding practices will significantly reduce the risk of electrical hazards and improve overall system reliability.