34001813EN/AE - Page 24
2. Installation
2.8 Connection of power cables for parallel UPS units
Equipotential bonding between parallel-connected units
Connect the exposed conductive parts (ECP) of the parallel-connected UPS units using an additional earthing cable (not
supplied) with the following characteristics:
- size equivalent to that of the supply cables,
- as short as possible.
Connection of earth cable and tying of cables
Connections must be made according to the diagram below:
N L1 L2 L3N L1 L2 L3L1 L2 L3 N L1 L2 L3N L1 L2 L3L1 L2 L3N L1 L2 L3N L1 L2 L3L1 L2 L3
Main earth
Main earth
Additional equipotential
bonding between units.
UPS 1 UPS 3
UPS 2
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