Two transfer switch enclosures on a post by the barn, with conduit running underground
4 Point Electric job photo

Generator Hookups, Interlocks and Transfer Switches

When the power goes out, you roll the generator outside, plug one cord into the wall, flip the switch, and the fridge, the furnace fan, and the lights come back on. We install the inlet and the interlock or transfer switch, and show you how to run it.

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A portable generator helps only if it can reach the house safely. Power fed into a wall outlet can travel back out the service wires toward the utility's lines, where crews are working, so the connection has to go through equipment that keeps the house and the utility apart. R H. had us set that up after the January 2024 ice storm:

I needed my 54-year-old electrical panel upgraded to a new 200 amp electrical panel and an exterior generator plug/interlock kit installed so my house could run off a generator. The ice storm power outage from January 2024 is not going to happen to my house again. …

R H.5 stars · Google review
Open transfer switch panel beside the meter, wired for a standby generator
4 Point Electric job photo
Storm-broken tree limbs cut up in a yard beside the street
Unsplash · Photo by Christi M · Unsplash License · Cropped

Interlock or transfer switch?

Both start with an inlet box on the outside wall where the generator cord plugs in. An interlock is a sliding plate on the breaker box that lets only one of two breakers be on at a time, the main breaker or the generator breaker. It's the simpler option, and in an outage you can turn on any circuits in the panel the generator can handle. A transfer switch is a separate box wired to a handful of circuits you pick ahead of time, like the fridge, the furnace, and the well pump. Older panels sometimes have no interlock made for them, and a transfer switch or a new panel solves that.

Matching it to your generator

Standby generator on its pad with the transfer switch mounted beside it
4 Point Electric job photo

The generator's running watts decide how much you can run at once. A fridge, a freezer, the furnace fan, some lights, and the phone chargers fit most portable generators. A well pump or an electric water heater takes much more, especially for the moment it starts. We match the inlet and breaker to your generator and talk through what can run together. Jesse priced this one and Ben installed it:

Small bungalow with warm lights on in the windows at night
Unsplash · Photo by Devon MacKay · Unsplash License · Cropped

Needed to hook up a switch for my homes generator. Jesse was quick to respond and gave me a reasonable estimate. Ben came and did the work and a fantastic job. Very pleased with the work done.

Steve Z.5 stars · Google review

Learning to run it

On the last visit we practice it with you: starting the generator outside, away from windows and doors, switching the house over, and switching back when utility power returns. Ben taught Alan G. how to work his new generator panel:

4 Point Electrical is amazing. We met Ben who is very knowledgeable and skilled. He did a great job installing our new generator panel. Ben was very oatient answering questions and teaching me how to use the new panel. Thank you Ben. Looking forward to the next electrical project we have.

Alan G.5 stars · Google review

Backup that starts on its own

If you'd rather skip the cords on a dark night, a standby generator starts by itself when the power drops. If EWEB supplies your power, it lists a zero-interest backup power loan of up to $5,000 for a permitted installation with transfer equipment; the EWEB guide has the details.

Get a generator hookup estimate

Send the generator's model and wattage, a photo of your breaker box, and the list of things you want running in an outage.