Eaton Powerware 9155 UPS20-30kVA User Manual page 41

UPS module
Cable A
20 kVA 35 mm
30 kVA 70 mm
SPM
40 kVA
60 kVA
80 kVA
90 kVA
120 kVA
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
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.
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Revision B
Bypass Input X2
Cable B
16 mm
2 2
35 mm
2 2
Cable E
95 mm
2
120 mm
2
2x95 mm
2
2x150 mm
2
2x185 mm
2
= Total length of 2A + 2B
= Total length of 3A + 3B
= Total length of 4A + 4B
UPS 20-30 kVA, 230 V 0/60 Hz output
User's Guide
Fuse 1 Cable C
100 A 10 mm
2
160 A 10 mm
2
System Bypass
Cable F
50 mm
2
70 mm
2
2x50 mm
2
2x70 mm
2
2x95 mm
2
Rectifier Input X1
Cable D Fuse 2
10 mm 35 A
2
10 mm 50 A
2
Fuse 3
200 A
315 A
400 A
500 A
630 A
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