5. Addendum
5. ADDENDUM
5.1 Identification system of a power distribution network according IEC
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TT, IT, TN-C and TN-S
The first character indicates the position of the neutral conductor:
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T : Directly connected with the protective earth.
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I : Isolated from the protective earth or connected through an impedance.
The second character indicates the grounding manner of electrical equipment:
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T : Directly connected with the protective earth.
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N : Connected with the neutral conductor of the power source.
The third character indicates the situation of the neutral (N) conductor and the protective earth (PE) conductor:
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C : Common conductor for neutral and protective earth.
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S : Separated conductors for neutral and protective earth.
1. International Electro-technical Commission
R5976620 CUSTOM POWER BOX 05/06/04
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