Automatic UPS Wiring for Partial Load – The rest Depends on Main Power

Electrical Technology

Automatic UPS / Inverter Wiring Diagram in Case of  some items depends on UPS and the rest on Main or Generator Power

Suppose you have two lighting bulbs, one ceiling fan and a 2-pin socket in the first room and one light bulb, two calling fans and a 2 pin socket in another room. In a second scenario, you are having all the above mentioned electrical appliances in single or different rooms as shown in below fig 1.

Now, you need to do electrical wiring such a way that two lighting bulbs, a ceiling fan and a 2-pin socket depends on the backup power stored in the batteries connected through UPS / Inverter without interruption (in case of power failure) and the rest on main (utility) power or another power source like generator or wind power. This is the same case where we need a continues power supply to PC and project works without interruption with the help of UPS.

In the following UPS / Inverter wiring diagram, It clearly shows that when the utility power is not available, the connected ceiling fan, two light bulbs and a 2-pin socket will be operated through batteries and UPS as the output Live (Phase) wire of the UPS / Inverter is only connected to them and the rest will be off due to the absence of main power.

When the main utility power restores, all the connected appliances and devices in the home wiring (such as refrigerator, TV, computer, fans, lighting bulbs, washing machines etc) will be working as normal as the main supply is available to all of them. In addition, the main power will also charge the batteries through inverter to charge the batteries as well.

Keep in mind that we only connected the Live (Phase) as output from UPS to some of the appliances where we need continuous power supply because, the Neutral wire is already connected to all of the all sockets and appliances in the home. And yes, You may also use and connect two wires (Neutral & Line) as output from UPS to the electrical appliances as discussed in our earlier UPS / Inverter wiring diagram.

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Automatic UPS / Inverter Wiring Diagram in Case of some items depends on UPS and the rest on Main or Generator Power
Automatic UPS wiring for partial load & The rest depends on utility Power

Wiring Color Code:

We have used Red for Live or Phase , Black for Neutral and Green for Earth Wire in single phase. You may use the specific area codes i.e. IEC – International Electrotechnical Commission (UK, EU etc) or NEC (National Electrical Code [US & Canada] where;

NEC:

Single Phase 120V AC:

Black = Phase or Line, White = Neutral and Green/Yellow = Earth Conductor

IEC:

Single Phase 230V AC:

Brown = Phase or Line, Blue = Neutral and Green = Earth Conductor.

Note: Use 6 AWG (7/064″ or 16mm2) cable and wire size to connect the UPS to the main panel board.

General Precautions

You may find more related step by step tutorials about UPS / Inverter Wiring Diagrams & Connections with description, and operation. If you are still facing difficulties, please leave a comment in the below comment box.

You may also read other Electrical Wiring Installation Tutorials.

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