ALLTRONIC SEMIS T33 30 Manuel D'installation Et D'utilisation page 66

Separate bypass on separate lines:
Note:
UPS with no modification of the neutral regime and with separate bypass input
UPS with separate bypass input connected to an independent power supply line
UPS with separate bypass input connected to an independent power supply line
connected to an independent power supply line
and with input galvanic isolation
and with output galvanic isolation