This question was originally posted by Sajith on APC forums on 9/26/2011
We have installed subject UPS in our customer site.
Wiring was done for 3 phase input and supplied to UPS as L1(Red), L2(Yellow), L3(Blue) configuration and the UPS was working fine. But now the customer has changed his mind to use single phase only. In that case can we use the same input by using L1(Red) only and disconnect other phases (L2-Yellow,L3-Blue)?