Why the bypass transformer input is fed from Normal LV Switchboard and the rectifier transformer is fed from Emergency LV Switchboard? If so, how the outputs are synchronised?
SMALL UPS units simply require plugging like any other appliance.
Larger installations are more complex and require careful design, preferably by a UPS specialist. Use of two different mains supplies for the "normal" and the "bypass" inputs is common practice to facilitate maintenance of the switchgear.
These two supplies MIGHT not need to be in phase, but this depends on the internal design of the UPS.
It is most unlikely that a standby generator will run in phase with the public supply.
SMALL UPS units simply require plugging like any other appliance.
Larger installations are more complex and require careful design, preferably by a UPS specialist. Use of two different mains supplies for the "normal" and the "bypass" inputs is common practice to facilitate maintenance of the switchgear.
These two supplies MIGHT not need to be in phase, but this depends on the internal design of the UPS.
It is most unlikely that a standby generator will run in phase with the public supply.
