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3.3 Connecting Power Cables
Each single UPS of the parallel system needs to configure the MCB and cables respectively, refer to 2.4 Connecting
Power Cables for the specification. The recommended configurations of the total power cables are listed in Table 3-1
and Table 3-2 for the parallel system.
3.3.1 Connecting Power Cables
The power cables of the UPS are connected to the I/O terminal block of the rear panel of the UPS, the layout of the I/O
terminal block is shown in 2.6.1 Connecting I/O Cables.
Table 3-1 Input & Output cable CSA for 10 kVA parallel system (unit:mm
Parallel
UPS
number
2 Units
3 Units
4 Units
Single
Parallel
Input cable
for parallel
UPS
system
number
2 Units
25
3 Units
35
4 Units
50
3.3.2 Connecting Parallel Cables
The parallel system provides parallel cable option. The parallel cables form a ring connection through the parallel ports
on the rear panel of the UPS. Taking 20kVA model for example, the cable connection schematic diagram of 3 + 1
parallel system is shown in Figure 3-1.
Vertiv|Liebert® S600 10kVA ~ 20kVA UPS | User Manual
Total input
Phase
line
for parallel
system
10
10
16
Table 3-2 Input & Output cable CSA for 20 kVA parallel system (unit:mm
3-in 3-out
Single
Total
output
neutral
cable for
line for
parallel
parallel
system
system
25
25
35
35
50
50
3-in 1-out
Total input
Total output
neutral
cable for
line for
parallel
parallel
system
system
35
25
70
50
120
70
Grounding
cable for
parallel
system
25
35
50
2
, ambient temperature: 25 deg C)
Total
grounding
cable for
parallel
system
35
70
120
2
, ambient temperature: 25 deg C)
3-in 1-out
Total
Total
output
neutral
cable for
line for
parallel
parallel
system
system
50
50
70
70
95
95
Grounding
cable for
parallel
system
50
70
95
27
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