Do you have a portable generator? Perhaps you've bought one for camping or outdoor events. It's also likely that you purchased a generator so that you can have electricity when the utility power fails, either as the result of storms or unexpected interruptions to the power grid.
That's great, but have you given any thought to how you'll get power from your generator to the devices and branch circuit breakers in your home where you'll need it? In this article, we'll examine one common way to have your generator feed your home with power safely during an outage by installing a generator interlock switch on your main breaker panel.
A generator is a useful source of backup power for emergency use. There are several different ways that a generator can be used to supply power to your home.
Backup or whole-house generators are mounted permanently outside of your home and hardwired into the home's electrical circuits. They often utilize triggers to turn on automatically when the power goes out and use natural gas or diesel fuel for power. You can learn more about the advantages of backup generators in this article.
Smaller gasoline-powered generators can serve multiple purposes and are useful for providing power to portions of your home when the electricity goes off. There are three ways to connect a portable generator to your home's electrical circuits.
We've touched upon the dangers of backfeed when using a portable generator, but there are some other dangers that must be considered when using a generator for your home.
Portable generators produce carbon monoxide, a colorless and odorless gas that can cause death in high enough concentrations. Carbon monoxide levels can accumulate in enclosed spaces, so you should never run your generator in the garage, other enclosed spaces, or near open windows. This fact sheet from the CDC reiterates the dangers of carbon monoxide when using a generator.
Backfeed occurs when the main circuit breaker for your home is still on and power is being fed into the home through the use of a generator. This can create the potential for electrical shock to linemen working on the power lines outside your home. Transfer switches and interlock kits prevent backfeed.
When an interlock switch is properly installed, it prevents the generator circuit breaker and the main circuit breaker from both being on at the same time. An interlock kit is a safe and cost-effective way to ensure you're using a portable generator safely.
When you install a generator interlock you eliminate the biggest danger you can create when you connect a generator to your home's circuitry - the danger of backfeeding power into the mains from generator power. This can also be accomplished with a transfer switch, but a generator interlock kit is less expensive and easier to install.
Generator interlock kits are legal throughout the United States. However, there are some important points to consider.
Many jurisdictions require that interlock kits be installed to match local building codes. Consult with your local government to see what local regulations are regarding generator feeding.
Your local jurisdiction may require that a professional electrician install the kit. Be sure to check local regulations when considering generator interlock installation.
A generator interlock kit is a mechanical device. For the interlock switch to work properly, it must fit your electrical panel properly. When shopping for an interlock kit, you'll need to know the following information.
Note the location of the main breaker. Is the breaker centered, or offset to the right or left? In addition is it at the top, or in line with the other breakers?
Record the amperage of the main breaker.
Measure the gap between the main breaker and the branch breakers.
Now note which way the breaker is thrown. Does the switch move right to left or up and down?
With this information, you should be able to find the correct interlock kit when shopping either at a store or online. In fact, some online stores will guide you through this process step by step so that you'll be confident that you've gotten the right interlock kit.
Once you've gotten the correct interlock kit, it's time to install it on your breaker box, so you can use generator power safely in your home. It's important to note that every interlock kit is different, and the best way to properly install your specific kit is to carefully follow the instructions and documentation provided with it. With that said, here are some general guidelines for how your installation should proceed.
Once you install a generator interlock switch, the operation will be simple and foolproof.
When you have a power outage, go to the circuit breaker panel and adjust the interlock switch so that you can turn off the main breaker. This will position the interlock switch plate so that the switch for the generator breaker is set to the on position.
Plug your generator into the outlet associated with your generator breaker, and then start the generator.
Now that power is flowing into the system, you'll be able to turn breakers that supply your home on and off so that power flows to where you need it.
Having a plan for backup power for your home when the utility feed fails is a smart idea. And there are many ways to achieve this, including backup whole-home generators. However one of the most economical ways to provide power is with a portable generator.
Using a generator is not without risk. You must ensure that your generator is properly placed to avoid carbon monoxide poisoning, and it must be connected to your home so that the electrical current doesn't backfeed into the power grid.
A generator interlock kit is an economical and safe way to ensure that you can use a generator without risk. And with proper preparation and some careful work, installing one on your breaker panel is a job that's within the skill of the average do-it-yourselfer.
If you're unsure that installing an interlock kit is something you want to handle, or you want to look into other options for providing backup power to your home, contact us, and we'll be happy to talk about the options that are available to you.
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