Eaton UPS 20 - Page 44

44 UPS 20-40 kVA, 230/400 V 50/60 Hz output
User’s Guide
1025358
Revision D
UPS module Cable A Cable C Fuse 1
20 kVA 16 mm² 16 mm² 50 A
30 kVA 16 mm² 16 mm² 50 A
40 kVA 25 mm² 16 mm² 80 A
SPM module Cable B Cable D Fuse 2
20 kVA 16 mm² 16 mm² 50 A
30 kVA 16 mm² 16 mm² 50 A
40 kVA 16 mm² 16 mm² 63 A
50 kVA 25 mm² 16 mm² 80 A
60 kVA 35 mm² 16 mm² 100 A
80 kVA 50 mm² 25 mm² 125 A
90 kVA 70 mm² 35 mm² 160 A
100 kVA 95 mm² 50 mm² 200 A
120 kVA 95 mm² 50 mm² 200 A
150 kVA 120 mm² 70 mm² 250 A
160 kVA 150 mm² 95 mm² 250 A
Table 11 Recommended cabels and fuses for the wiring diagram
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.