(2) When power supply restores from power grid Three Phase Electrical Wiring Installation in a Multi-Story Building.Three Phase Electrical Wiring Installation in Home – NEC & IEC.In this case, connected electrical appliances through the live wire from UPS / Inverter consume the stored electrical energy in the batteries without interruption. Live Wire from Main board to UPS) would be inactive because power supply is not available from power house. So the first one phase wire which has already connected before UPS installation (i.e. In this case, electric supply will continue through Phase wire (Output of UPS) which is connected to the batteries and UPS and then to electrical appliances (Note that Neutral is already connected). (1) When utility power is not available from power house
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