LEGRAND NUMERIC HPi 33 EVO User Manual page 14

3.9 UPS parallel Installation
The following sections introduce the installation procedures specified to the parallel system.
3.9.1 Cabinet installation
Connect all the UPS needed to be put into parallel system as below picture.
Make sure each UPS input breaker is in "off" position and there is no output from each UPS connected. Battery
groups can be connected separately or in parallel, which means the system itself provides both separate battery
and common battery.
3.9.2 Parallel cable installation
Shielded and double insulated control cables available must be interconnected in a ring configuration between
UPS units as shown below. The ring configuration ensures high reliability of the control.
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WARNING!
Make sure the N, A (L1), B (L2), C (L3) lines are
correct, and grounding is well connected.