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UPS 225 - 275 kVA/300kVAPF0.8
1027212
User’s and Installation Guide
Revision E
Figure 4-3. Distributed bypass wire length
NOTE
Required parallel system wiring length must be equal to ensure approximately equal current
sharing when in Bypass mode. For proper operation the following must be true:
1A = 2A = 3A = 4A
1B = 2B = 3B = 4B
In order to save cabling costs, the following is also considered to be sufficient:
1A+1B=2A+2B=3A+3B=4A+4B
Any difference in wire length will result in decreased capacity of the UPS system while on
bypass. For example, a 10% difference between the longest and shortest wire lengths will result
in a decrease in bypass capacity of 10%. This may disable transfer to inverter.
