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34001813EN/AE - Page 20
2. Installation
Parallel configuration without external bypass cabinet and with separate normal and Bypass AC
inputs (maximum two units in parallel)
The requirements for the different system earthing arrangements (SEA) are similar to those for single UPS
configurations. In the diagrams on page 18, simply replace the single UPS units between points A, B and C by the
following parallel configuration.
The UPS installation may be equipped with earth-leakage protection upstream on the condition that the protection
apply to:
- the normal and Bypass AC inputs
- all the parallel-connected UPSs.
Normal AC
15
Bypass AC
16
14
Normal AC
15
Bypass AC
16
14
B
A
C