How To Connect Generator To House With Transfer Switch

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You've settled on the perfect generator to power your domicile if the lights go out during the next big storm. Only before you can consider yourself fully prepared for a coma, you need a generator transfer switch.

A generator transfer switch is essential to safely connecting your generator to your domicile's electrical circuit. Without one, you'll exist forced to run extension cords from every appliance in your firm to your generator outside – probably not the solution y'all're envisioning.

In this guide, we'll explicate everything you need to know nearly these critical devices, including how a generator transfer switch works, how to install a generator transfer switch, and how to size a generator transfer switch.

Why a generator needs a transfer switch?

Generator Transfer Switch: How Does It Work and How to Install One?

If you've already got a generator, why do you need a transfer switch to connect it to your home?

The brusk answer is that it's for safety. Hard wiring a generator directly into your dwelling'due south electrical circuit or backfeeding power by plugging your generator into a household outlet are both incredibly dangerous. In fact, these methods are so unsafe that connecting your generator to your dwelling'south electrical circuitry without a transfer switch is illegal in many places.

In those cases, your home is still connected to the electrical grid. So, the power could come back on at any moment and overload your generator – which has the potential to crusade electrocution or even outset a fire. Or, if someone from the power company goes to work on the electric lines outside your domicile, they could be electrocuted since your generator is feeding power dorsum into the lines without them knowing about it.

By using a transmission or automated transfer switch for your generator, you ensure that your generator and the electrical filigree can't interact through the circuitry in your home.

How does a transfer switch work?

A transfer switch works by transferring your home's internal excursion from dependence on the electrical grid to dependence on your generator. Essentially, your home's circuitry becomes an isolated path that can merely connect to outside power through the transfer switch. You then use the switch to either close the circuit with the electrical grid or with the generator.

Depending on how your firm is wired and the amount of ability your generator provides, y'all may demand a whole house transfer switch for your portable generator or only a partial transfer switch. You lot may take all your appliances running on a single excursion breaker, in which instance they can be moved equally a unit onto the transfer switch. But, some homes have a split breaker for a well pump or heating system. Those appliances volition need a second transfer switch or they will demand to be wired with your other breaker into a unmarried switch.

Importantly, generator transfer switches can be either manual or automated. With a manual transfer switch, you lot have to manually open a circuit on the transfer switch to motility your abode from the electric grid to the generator and dorsum. That's not difficult, but it means y'all'll take a few minutes without power when the lights first go out.

An automatic transfer switch for your generator will automatically discover when the power goes out and switch your home onto the generator'south ability supply. Of class, this is only helpful if your generator will also turn on automatically when the ability goes out, as many permanently installed abode generators do.

How to install a generator transfer switch?

Generator Transfer Switch: How Does It Work and How to Install One?

Information technology's a skilful idea to install your generator transfer switch well in accelerate of a potential blackout. After all, it's a lot easier to do with the lights on than in the dark.

The first step in installing a fill-in generator transfer switch is to make up one's mind what appliances you want to ability and to match this confronting the amount of ability your generator supplies. Ideally, your fridge, freezer, and lights are on private circuits so you tin ensure these become ability. You can put more appliances onto the transfer switch than your generator can handle, simply you'll need to be very careful about running them then that you don't overload your generator.

Once yous've got that sorted out, it's time to connect the generator transfer switch to your business firm. Open up your circuit billow box and plow the master ability breaker off. Beware that the terminals where electricity enters the excursion breaker will still be powered.

At present, feed the wires from your transfer switch into your circuit breaker box. Make sure the wires tin can attain all of the circuit terminals, then secure the base of operations of the wires in place using a locknut, bushing, or other fixture. With the wires adjusted to length, you can also mountain your transfer switch on the wall next to your circuit breaker box.

For each excursion you're going to move from the circuit breaker onto the transfer switch, there are a few steps to follow:

Remove the breaker from your console and disconnect the hot wire (usually black) from the lug on the breaker.
Adhere the cherry wire from the transfer switch – corresponding to the transfer switch breaker that yous want that circuit on (see below) – to the lug. Then reinstall the breaker in the panel.
Find the black wire for the same transfer switch breaker and connect information technology to the hot wire that you initially removed from the circuit breaker console. Apply a wire connector cap for this.

You'll echo this procedure for every circuit you want to motion from the excursion breaker onto the transfer switch. Go along in mind that you need to balance the load among circuits on the transfer switch. That ways that if you put a heavy-duty appliance similar the fridge onto a breaker on the left side of the transfer switch panel, put another heavy-duty apparatus like the freezer onto a correct-side breaker.

Once you're finished, attach the white neutral wire from the transfer switch onto an open lug in the neutral motorcoach bar of your circuit breaker panel. Finally, finish the installation by attaching the green basis wire to an open lug on the grounding bar in the excursion breaker panel.

You can connect the transfer switch to your generator by plugging the power string from your generator into the terminal on the transfer switch. Brand sure the generator is off when making this connection. When everything is finished, make sure that all the circuits on your transfer switch are set to "Line" and plough the primary circuit breaker in your circuit panel dorsum to "On" to restore power to your dwelling house.

How to size a generator transfer switch?

The size of generator transfer switch you need volition depend on the power your generator can produce. Your transfer switch should be rated for at least as much wattage equally your generator's maximum power, and ideally slightly more to be safe.

As for the number of circuits you need on the transfer switch, that depends on how your home's appliances are bundled on your circuit billow. Most homeowners need less than 10 circuits, just make certain to cheque your circuit breaker setup before deciding.

In conclusion

Generator Transfer Switch: How Does It Work and How to Install One? A generator transfer switch is an essential – and legally required – slice of equipment for connecting your portable or standby generator to your dwelling during a blackout. These switches ensure that your generator and the electrical grid aren't backfeeding into one some other, which can result in a very dangerous situation. Your generator transfer switch should be rated for at least equally much wattage every bit your generator to avoid an overload.

Installing a generator transfer switch takes a few minutes of work, just it's easy to do. The virtually important thing is to make sure y'all that turn off the main power excursion on your excursion breaker to eliminate the take chances of electrocution. One time your generator transfer switch is installed, you're ready to go on your abode running smoothly the next time the power goes out.