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Chapter 4 Prerequisites for the UPS installation
Required electrical earthing systems
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.
Multi-line-fed power input
For error free operation it is essential that power supply system is always implemented as a
TN-S
earthing system. This is also relevant and important when multiple power sources are
used. In this respect power sources are not only all feeding points or transformers of the utility
power company, which supply electricity to the relevant power supply in question, but
particularly also any potential emergency power system and UPS units.
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Figure 15
is called the TN-S system. Typical for a TN-S system
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