Technical information

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1SDC210033D0202
2. TN-C: the neutral and protection functions are combined in a single conductor called
PEN
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3. TN-C-S: the neutral and protection functions are partly combined in a single conductor
called PEN and partly separate PE+N
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71& 716
Consult QT3: “Distribution systems and protection against indirect contacts and earth faults” for further details.
G3.17 IT system
IT system have no active parts directly earthed, but may have live parts connected to earth
through high value impedance. All the exposed-conductive-parts, separately or in group, are
connected to an independent earth electrode.
Glossary
Releases and Protections
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W