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Chapter 4 Prerequisites for the UPS installation
In case of multi-line-fed power input it has to be ensured that
between N and PE system are implemented in the same power supply system, irrespective to
whether the emergency power system is up and running or not.
In this set up all N conductors are connected to each other and the N network is only once
connected to the PE system.
This connection takes place in the central earthing point (CEP). This CEP is to be implemented
at the point with the largest to be expected short-circuit / earth current. It has to be
dimensioned accordingly. The CEP is also be implemented such that a measurement /
monitoring of the current at this point at any time is possible without any further risk.
gives an overview of such an installation.
Feed-in points located at a distance from each other and the respective Power supply systems
are to be considered as independent TN-S networks and are to be interconnected exclusively
via existing PA / earth lines.
The connecting of the N-conductors of these separate networks with each is
FORBIDDEN!
32
NO MULTIPLE CONNECTIONS
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Figure 16
STRICLY
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