Powerware 9155 UPS20-30kVA User Manual
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UPS 20-30 kVA, 230 V 0/60 Hz output
User’s Guide
1026743
Revision B
Table 9 Minimum cable and fuse ratings for the different parallel systems with installations procedure C
Note!
Protection fuses need to be used for load cabling if manufacturers SPM (or similar)
not used.
Required parallel system wiring length should be in accordance with the following rule, as
referenced to the diagram below to ensure approximately equal current sharing when in static
bypass mode (see figure below):
Total length of 1A + 1B
= Total length of 2A + 2B
= Total length of 3A + 3B
= Total length of 4A + 4B
This rule has a tolerance of approximately ± 10% for the combined input and output wire lengths.
If installing only two UPS modules (redundant), this requirement is no longer required as each
UPS is capable of supporting the full bypass requirement. However, this would preclude future
expansion.
The recommended length of B cables is 2 m or more.
UPS module
Bypass Input X2
Rectifier Input X1
Cable A
Cable B
Fuse 1
Cable C
Cable D
Fuse 2
20 kVA
35 mm
2
16 mm
2
100 A
10 mm
2
10 mm
2
35 A
30 kVA
70 mm
2
35 mm
2
160 A
10 mm
2
10 mm
2
50 A
SPM
System Bypass
Cable E
Cable F
Fuse 3
40 kVA
95 mm
2
50 mm
2
200 A
60 kVA
120 mm
2
70 mm
2
315 A
80 kVA
2x95 mm
2
2x50 mm
2
400 A
90 kVA
2x150 mm
2
2x70 mm
2
500 A
120 kVA
2x185 mm
2
2x95 mm
2
630 A