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Chapter 12 Helpful information
http://de.electrical-installation.org/dewiki/Eigenschaften_von_TT-,_TN-_und_IT-Systemen
Note: Everything stated on electrical earthing systems in this chapter applies to both A/C and D/C
power grids.
TN-S systems
The term TN-S comes from the French Terre Neutre Séparé meaning earth neutral seperated.
The earthing system shown in
is that the neutral conductor (N) and the earth or protective conductor (PE) are run as separate
wires. It is often referred to as "five-wire cabling".
Commonly utility power companies provide the power with 4-poles or 5-poles. In case of 4-
pole feed it imperative to separate PE from NE as soon as possible at a suitable point in the
power network. This is usually done behind the entry point of the utility power source into the
power sub-distributor by installing a central earthing point.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Figure 59
is called the TN-S system. Typical for a TN-S system
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