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Chapter 12 Helpful information
TN-C-S system
The term TN-C-S comes from the French Terre Neutre Combiné Séparé meaning earth neutral
seperated.
Figure 61
A TN-C-S earthing system is given when parts of the utility power is supplied with four poles
and others are supplied in five poles. This represents a combination of a TN-S and TN-C
earthing system with all the disadvantages of the latter.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
shows an overview of the TN-C-S earthing system.
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