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What is the TN-C System?

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What is the TN-C System?

TN-C System Definition

TN-C system has both the neutral and protective functions combined in a single conductor throughout the system. This conductor is called PEN (protective earth neutral). The consumer’s earthing terminal is directly connected to this conductor.

TN-C System Advantages

Reduces the number of conductors required for supply, which lowers the cost and complexity of wiring.
Provides a low impedance path for fault currents, which ensures a fast operation of protective devices

TN-C System Disadvantages

Creates a risk of electric shock if there is a break in the PEN conductor or if it comes into contact with live parts due to insulation failure.
Causes unwanted currents to flow in metal pipes or structures that are connected to PEN at different points, which can result in corrosion or interference.
Requires special precautions for connecting appliances with exposed metal parts that may be accessible simultaneously with other earthed metal parts.

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