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, where the transformer's neutral point is not grounded, the PE line functions as the protective ground. This setup helps prevent electric shocks in case of insulation failure.
3. In a TN system, where the transformer’s neutral point is directly grounded, the PE line acts as the protection zero line, connecting equipment enclosures to the neutral point for grounding purposes.
4. When the transformer’s neutral point is ungrounded, the metal parts of electrical devices must be connected to the ground through a protective grounding system (IT), ensuring that any fault current is safely directed away from users.
5. If the transformer’s neutral point is grounded, the system is referred to as TN, and the metal casing of the equipment should be connected to the neutral line, which is called protection zero. This method provides a reliable way to protect against electrical faults.
Understanding the difference between these systems is crucial for proper installation and maintenance of electrical systems, especially in industrial and commercial environments.
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