Manual Transfer Switch Buyer's Guide
How to Pick the Perfect Manual Transfer Switch
During a sudden power outage, you probably don’t feel like running multiple extension cords from your appliances to the portable generator outside. Not to mention you have to keep your windows or garage door open to run the cords, which could be a security concern.
A manual transfer switch simplifies backup power by connecting a generator directly to your electrical circuits. No cords running through the house. No open windows. No hassle.
Other benefits of installing a manual transfer switch include:
- Improved Safety
- Ability to power hardwired appliances like the A/C
- Connectivity to entire service panel
How Does a Manual Transfer Switch Work?
A manual transfer switch connects a generator to your home's main circuits and switches them to run on backup power during an outage. This means any appliance on that circuit will be powered. Many manual transfer switches are NEMA rated for indoor or outdoor installation.
Your generator's power output will determine the number of circuits you can connect. Most 5,000 watt generators can restore power to six circuits. Larger generators can power 10 circuits.
A typical manual transfer switch installation involves connecting it to your main electrical panel circuits in the basement and then wiring it to a power inlet box that sits on the side of your house (see diagram above).
The power inlet box is what the generator will plug into during a blackout. If your main electrical panel is in your garage, you don't need a power inlet box because the generator can plug directly into the transfer switch through an open garage door.
The connection created between a generator, transfer switch, electrical panel, power cord, and power inlet box is called a power transfer system. You will want a professional electrician doing the installation due to all the wiring involved.
Sizing a Manual Transfer Switch
The best way to size a manual transfer switch is to match it to the largest outlet on your generator.
For example, if you see that your generator's largest outlet is rated at 30 amps, you will need to buy a 30-amp transfer switch to get the full power load.
Wattage Meters
Several manual transfer switches also include built-in wattage meters that keep track of what's being powered. Without them, you can overload the system, damaging your generator and appliances.
How to Connect a Manual Transfer Switch
No matter what type of generator or switch you have, we highly recommend consulting the owner's manuals of both for detailed instructions and safety guidelines before using.
Generally speaking, here are the steps to connect a manual transfer switch and switch to generator power during a blackout:
- Turn off all the circuits in the transfer switch.
- Connect the generator and transfer switch using a gen cord.
- Start the generator and let it warm up outside.
- Flip the main breakers in the transfer switch from "Line" to "Generator" power.
- One at a time, turn on the circuits you want to power, ensuring the generator doesn't get overloaded.
Once power is restored...
- Turn off the main breakers in the transfer switch back to "Line" power.
- Turn off the generator
- Disconnect any cords
Expert Advice
If you are still unsure which manual transfer switch is the best for your generator and home, you can always give the experts a call to get the advice you need to complete your project.
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