how to wire two transfer switches to one generator

How to wire two transfer switches to one generator? Explained!

People have become frustrated about power outages and also have become more sincere to reduce high electricity bills. That is why people are finding out how to wire two transfer switches to one generator to get uninterrupted power service.

So, how to wire two transfer switches to one generator?

After installing the right transfer switches for your generator then you should plan the installation, turn off the breaker panel’s power, contact between the generator and transformer switches, attach wires from the house breaker panel to transfer switches, wire transfer switches and take precautions. 

If you have come to find out here how to wire two transfer switches to one generator then you have come to the right place.

Can Anyone Wire Two Transfer Switches to One Generator?

Yes, it is possible to wire two transfer switches to one generator.  Power Technologies provides a selection of  Automatic Transfer Switches (ATS) with solutions that enable simple load switching between utility and backup power sources to increase power availability and any transfer switch can start the generator. 

What Transfer Switch Should You Choose for a Generator (Standby)?

Manual transfer switches are not compatible with standby generators. An automatic transfer switch is required to connect your generator to your house and continuously monitor the utility power entering your home. An automatic switch is the best option for you if you want to have backup power that is as easy to use.

How To Wire Two Transfer Switches to One Generator (Standby)? 

Required tools:

First, we have to identify those materials which we need to wire switches.

Tools and Materials:
1. Pliers
2. Wrenches
3. Electrical cable 
4. Screws

Step 1: How to Install Transfer Switches?

Install the transfer switch and inlet box at the located place:

We have to choose a location where you want to build up the setup to wire two transfer switches. The place should be comfortable to put two transfer switches. On the chosen wall, mount the transfer switch and also put it outside the Intake box. 

Run Electrical Wiring & Grounding Rod:

From your current electrical panel to the transfer switch, run every line and install any necessary breakers. From the transfer switch, you have to Feed wires into the inlex box. With the box, a ground rod needs to be attached from the outside.

Step 2: Wiring Two Transfer Switches to One Generator 

Choosing The Right Transfer for The Specific Generator:

Choose a pair of transfer switches capable of handling the entire electrical load. Ensure that they work with your generator and each other.

Planning Installation:

Make sure they are not wired in parallel and install the transfer switches in different locations. The load side of the main service disconnect and the generator side of the transfer switches should be linked together. The intended installation can be outlined in a diagram after you have these measurements.

Turning Off The House’s Breaker Panel’s Power:

Once the generator is installed, you may begin wiring and from the house breaker panel disconnect the power and while doing this the main breaker must be turned off. Locate the wires leading to the main switch after turning off the power by removing the breaker panel’s cover. These wires should be disconnected and put away.

Contact Between Generator and Transformer Switches:

The transfer switches’ cables need to be connected to the generator now. 

Put the generator’s black wire into the transfer switch’s black wire slot after finding it there.  

Next, do the same technique for the white wire. 

Next, find the ground wire for the generator and insert it into the transfer switch’s ground wire slot.

Finally, turn on the generator by plugging it into an outlet. The loads will now begin receiving electricity thanks to the transfer switch.

Link Wires from the House Breaker Panel to Transfer Switches:

It’s time to connect the transfer switches to the house breaker panel now that they are in position. It’s important to take caution and pay close attention to the directions. 

The two wires deriving from the generator should first be located under the breaker panel. These will be connected to two terminals on the transfer switch’s rear. 

The “neutral” connector is wired with white wire, and the “line” terminal is wired with black wire. To attach these two wires, locate two free locations on the breaker panel. Each place should have a label identifying the type of breaker it is (such as “CIRCUIT BREAKER”) above it. 

Afterward, join the black wire to the “LINE”

Wiring Transfer Switches:

Wiring the transfer switches is now required. 

The green wire needs to be unplugged from the generator for each switch before being wrapped around a screw. Not yet. Don’t tighten these screws. 

The black wire should then be unplugged from the generator and wrapped around a different switch screw. 

Once more, hold off on tightening these screws. After both cables are positioned, return and tighten each screw. 

Lastly, after following all steps we have to check if it is working or not.

How to Check if it is Successfully Working? 

Now is the result time of your whole setup through checking. It’s time to check out your setup now. The generator should first be turned on, and both transfer switches should be properly flipped. If everything is working properly, both lights should switch on and off when the generator does. Go back and double-check the wiring if you encounter any issues to make sure everything is in order.

Cover the floor hole where the generator was put after making sure everything is operating as it should. Moreover, please check your generator on a daily basis and instructions you could find from generac generator weekly test.


  • Power Wires Paralleled:

The power wires from the generator need to be paralleled together in a junction box between the two switches when installing a second switch.

  • Carefully Connecting Wires to Switches:

The second switch only requires the 23 and 194 control wires (run 0 as well, if using the load shed module). The generator doesn’t need a second set, and the other switch doesn’t need them to operate because T1, N1, and N2 are fed by the primary switch. You would need to make sure that any load shedding occurred in the main switch and not the A/switch if you didn’t run the 0 wire to the second switch. In addition, you must also check your generator oil which you could get an idea from A Detailed Guide On How To Bypass Low Oil Sensor On Generator.

  • Load Shed Module:

C’s The load shed module’s 0 wire serves as the battery ground from the generator. For more battery details please visit to best battery for generac 22kw generator.

Load Shed Module
Source: Display of wires to switch
  • Choosing Amperage for Overloading:

A maximum of 10 or 20 amps may be handled by the majority of transfer switches. If you attempt to connect a generator that has a larger amperage rating than the switch, there is a risk of overloading it and causing it to malfunction. Using a generator to power a building while the primary utility service is still active might be risky.

  • Electrical Line:

For each leg of the electrical line, you need two transfer switches to reliably supply a building with a high-amperage generator. It is also crucial to confirm that the generator is scaled appropriately for the requirements of the structure.


Always put safety first when dealing with electrical systems. Do not proceed with any step of the installation process without an expert if you are unsure. You can securely and effectively connect multiple transfer switches to a single generator by following the guidelines in this article on how to wire two transfer switches to one generator. Have a good day!

Frequently Asked Questions(FAQs):

Do I Need an Inverter Generator with a Transfer Switch? 

A transfer switch is usually necessary if your generator has a power output greater than 5,000 watts for safety and convenience. This is crucial to keep in mind because the amount of power being produced necessitates the usage of a regulator to prevent surges and back-feeding of the grid.

Do you start a generator before plugging it into the transfer switch?  

All you need to do is turn on your generator and attach it to the transfer switch. When power is present, the UTS will automatically determine how to alter the circuits. When the electricity comes back you need to disconnect and turn off your generator. Before using, be sure to read your owner’s manual completely. There more possibilities that we have explained next.

How Do You Test a Generator Transfer Switch? 

Start the test by turning off the circuit breaker for the usual power supply. The switch controller will turn on the available LED when it determines that the voltage is appropriate. The automated transfer switch mechanism will activate the LED at source 1 if source 1 stages it. Look at the utility line terminals’ phase-to-phase voltages.

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