If you are wanting to add a backup power source to your house in the form of a portable generator, there are a few things you will need to make sure you know before making the jump.
The most important being a transfer switch.
Not only are there safety precautions needing to be followed when installing a transfer switch, there are also important guidelines to follow for code regulations for your home.
In this guide I will be discussing what a transfer switch is, the types of transfer switches, which switch is best for your home, and how to use it to transfer power from your generator to your home.
By the end of this guide, you will be about to make an educated, informed decision on the proper transfer switch for your application and the needed steps to get it properly installed.
Table of Contents
- 1 What is a Transfer switch?
- 2 Do I need a transfer switch?
- 3 What To Look For In A Transfer Switch?
- 4 Types Of Transfer Switches
- 5 What to buy: My recommendations
- 5.1 Reliance Controls Corporation 31406CRK - Most Popular Manual Transfer Switch
- 5.2 EmerGen Switch 10-7501G2 - Great For Indoor Or Outdoor Applications
- 5.3 Reliance Controls Corporation 51410C For Generators Up to 12,500 Running Watts - Quick And Easy Installation
- 5.4 Generac RTSW200A3 - Most Popular Automatic Transfer Switch
- 6 How To Wire A Transfer Switch To Your Home
- 7 Conclusion
What is a Transfer switch?
A transfer switch is an electrical switch that transfers electrical power between two sources.
In our case, an automatic transfer switch (ATS) is installed between your home and the generator near the electrical panel.
This transfer switch allows you to have your portable generator provide power to the circuits you want to power in the event of a power outage.
With a transfer switch installed, you eliminate the need for running extension cords to each individual appliance which makes for a safe, up to code installation.
Do I need a transfer switch?
While a transfer switch is technically not needed, we are going to look at why we highly suggest having one installed when connecting a portable generator to any appliance in your home
When using a portable generator to power appliances in your home, it is required by the National Electric Code (NEC 700.5 and 701.5) to have a properly installed transfer switch.
This is especially important if you plan to sell your home in the future as this will cause a code violation if not installed properly.
Since most of your important electrical appliance like air conditioning units, furnaces, and water heaters are hard wired, they cannot be connected to a generator by an extension cord.
Also, having to find, untangle, and run extension cords during a blackout should be the last thing you need to worry about.
A transfer switch allows for the power to instantly switch over to the portable generator during a power outage for a quick, easy, and reliable alternative power source.
Using extension cords can cause back feed from the power traveling back down the utility line.
This increases the risk of fire or electrocution which could result in serious injury or death.
What To Look For In A Transfer Switch?
With the vast selection of transfer switches available, there are going to be a few things you want to look at when selecting the best one for you.
I have made this easy with a quick guide on what to look for.
There are two main type manual and automatic. We will dive into the differences below.
To ensure that you are getting everything you need to make an installation quick and easy with the correct parts, having an all in one kit is essential.
Most switches are sold as a kit, however, you want to double check to prevent having to piece things together.
When looking for a transfer switch, one of the most important requirements will be the amount of running watts it will be able to support.
It is crucial to determine which circuits you want to power through your switch and calculate the amount of watts it will take to run them.
Most brand name switch kits will have these certifications, but it is always a good idea to double check to ensure they are up to code specifications.
As with any purchase, you will want to check to see how well the company stands behind their products.
With anything that will be handling a large electrical load, it is nice to have that peace of mind that you are warrantied.
Types Of Transfer Switches
There is plenty to learn about transfer switches such as open-transition, closed-transition, and delayed transition switches.
These are very important in the business and office settings, but for the sake of this article, we are going to be focusing on home use only.
For home applications, there are two types that we will look at, the manual and the automatic transfer switch.
Each has its advantages and depending on your budget and application, you can select which is best to fit your needs.
So let’s take a look at each and determine what would be best for your application.
Manual Transfer Switches
A manual transfer switch allows you to manually switch the power source from grid to generator with the flip of a switch.
These switches are much less expensive than automatic transfer switches but will require you to access your switch during the event of a power outage.
They also allow you to manually manage the amount of load on your generator to prevent overloads.
Automatic Transfer Switches
An automatic transfer switch allows you to automatically switch the power source from grid to generator as soon as you lose power.
These switches can be programmable to automatically power the highest priority circuits during a black out.
With convenience comes cost, and these automatic transfer switches are no exception. With more features & higher maximum watt ratings, automatic transfer switches are generally priced higher than manual transfer switches.
What to buy: My recommendations
Finding which transfer switch is best for your home will depend on your budget and how easy it is to access your breaker box (or location of switch).
There are many options on the market to choose from that offer a wide selection of different options.
I will look at the top manual and automatic switches for a general guideline on my top picks.
Reliance Controls Corporation 31406CRK - Most Popular Manual Transfer Switch
The Reliance Controls Corporation 31406CRK is an Amazon customer favorite for many reasons.
This competitively priced, all in one manual transfer switch kit includes everything you need to safely and effectively transfer power from your generator to your home with ease.
- Maximum Running Generator Watts: 7,500
- cUL1008 Listed
- 5 Year Product Warranty
This kit includes a pre-wired transfer switch with wattage meters, 10-foot power cord, 30A power inlet box, wire connectors and extra 20A plug end.
EmerGen Switch 10-7501G2 - Great For Indoor Or Outdoor Applications
For versatile applications, the indoor/outdoor compatible EmerGen EGS107501 is the solution.
Many manual transfer switch boxes are meant to be mounted indoors making them out of the question for those needing an outdoor mounted box.
This is where this transfer switch really outshines the competition.
- Maximum Running Generator Watts: 7,500
- UL Listed
- 1 Year Warranty
The included nema 3R rainproof power inlet box keeps your connections safe while allowing for a versatile mounting location.
Reliance Controls Corporation 51410C For Generators Up to 12,500 Running Watts - Quick And Easy Installation
The 51410C is not only a solid competitor for the fact of being able to be used up to 12,500 running watts.
The simplistic designs allows for a quick and easy installation in both home and office settings.
This manual switch kit features a high quality, powder-coated steel box, six combination knockouts, resettable branch rated circuit breakers and non-defeatable double-throw switches.
- Maximum Running Generator Watts: 12,500
- Designed For Fast And Easy Installation
- 2 Year Product Warranty
Generac RTSW200A3 - Most Popular Automatic Transfer Switch
The Generac RTSW200A3 is an all in one automatic transfer switch built to power a whole home or small office.
This 200 amp, 120/240v single phase rated transfer switch features a convenient service disconnect to allow for easy maintenance or repairs.
The Nema 3R rated enclosure ensures your switch stays protected while keeping it easily accessible.
- Maximum Running Generator Watts: 48,000
- UL/CUL Listed
- 2 Year Product Warranty
How To Wire A Transfer Switch To Your Home
Wiring a transfer switch to your home is a process we suggest leaving up to the professionals, but if this is a task you do not mind tackling yourself, here is a quick overview of the proper steps to take.
- Locate your panel box and determine where you want to mount your switch. (Mounting your switch near your panel box is a common practice for easy installation)
- Mount your transfer switch to the wall and ensure that it is secure and out of the way of any obstructions or appliances
- Locate the main electrical panel of the house and turn off the main power. (Always double check that the power is off by testing appliances)
- Properly connect the wires coming from the transfer switch to the breakers you want to control in the panel box.
- Using the proper 1 ½” drill bit, drill a hole through the house wall from the outside to feed the electrical wires through.
- Install the included electrical box above the hole on the outside of the house.
- Run the proper electrical cable from the electrical box, through the hole, to the transfer switch.
- Locate the electrical receptacle included with your switch and connect it to the electrical cable at the outdoor box. Mount the electrical receptacle to the box.
- Connect the other end of the same cable to the transfer switch inside the home.
- Ensure that your portable generator is in working order before testing your work.
- To test your work, leave the main power to your home off and plug the generator into the outdoor electrical receptacle.
- Flip your transfer switch from line to generator and check that the connected circuits are receiving adequate power from the generator.
- If everything is in working order, flip your switch back to the original position, turn off your generator, and turn your main power back on.
- Seal up the hole in your wall to ensure weather, bugs, and moisture do not enter.
In conclusion, we hope that this guide has given you the information you need to make your decision on which transfer switch to choose and allowed you to learn how to install it.
A transfer switch is a great investment to help restore power in the event of a power outage where important appliance must keep running.
With the many different styles and applications, I want to hear your first hand experiences.
Have you used a transfer switch on your home? What kind of situations has a transfer switch helped you in?