Automatic vs manual transfer switch
An automatic transfer switch (ATS) goes with a home standby generator. It watches utility power. When the power drops, it signals the generator to start, waits until it's running properly, then moves your house over. When the grid comes back, it switches you back and lets the generator cool down and shut off. Nobody has to be home, which matters when an ice storm takes the lines down at 2 a.m. or while you're away for the week.
A manual transfer switch goes with a portable generator. You wheel the generator out, plug a cord into an inlet box on the outside wall, start it, and flip the switch yourself. It's simpler and cheaper, but someone has to be there, and someone has to go out in the storm to refuel it.
| Automatic transfer switch | Manual transfer switch | |
|---|---|---|
| Generator | Home standby, natural gas or propane | Portable, usually gasoline |
| Who starts the generator | The switch | You |
| Who moves the house over | The switch | You |
| Works while you're away | Yes | No |
Whole house or essential circuits: picking the transfer switch
A whole-house switch sits between the meter and your main panel and carries everything in the house. It pairs with a standby generator big enough for what runs at the same time, or with load management modules that briefly shut off big loads like central air or an electric dryer when the generator gets close to its limit.
An essential-circuits switch feeds a small subpanel with the circuits you pick in advance: furnace, well pump, sump pump, refrigerator, a few lights and outlets. It allows a smaller generator, but anything not on the list stays dark. If you have a well or a basement sump, those two go on the list first. Everything else is negotiable. Our generator sizing guide walks through how load decides the size.
Older homes in Albany and Troy with crowded or outdated panels sometimes need panel work before any transfer switch goes in. The installer will tell you at the site visit.
Generator interlock kits for portable generators
An interlock kit is a metal plate mounted on your main panel. It physically blocks the main breaker and a dedicated generator breaker from being on at the same time. Paired with an outdoor inlet and a proper generator cord, it lets a portable run the circuits you choose in your existing panel.
It's the simplest safe way to connect a portable, and it suits places like Brunswick, where rural homes on wells can't wait out a long outage. The tradeoff: you manage the load yourself by turning breakers on and off. Not every panel has an interlock made for it, so the installer checks the brand and model of your panel first.
Why backfeeding a generator is dangerous
Backfeeding means plugging a portable generator into a dryer outlet or a wall outlet with a double-ended cord. Without a transfer switch or interlock, nothing stops that power from flowing out of your panel onto the utility lines. The transformer on the pole steps it up, and a line worker who expects a dead wire can be killed by it.
It hurts you too. When utility power comes back while the generator is still connected, the generator and your wiring take the hit, and fires start that way. The exposed prongs on a double-ended cord are live whenever the generator runs. Code requires transfer equipment for any generator connected to house wiring for exactly these reasons.
And whatever switch you have, a portable runs outside, well away from doors and windows, never in a garage or basement. Carbon monoxide from a portable is the outage danger people underestimate most.
Transfer switch permit and inspection
Transfer switch installation is electrical work, so expect a permit from your town or city building department and an electrical inspection before the job is signed off. The installer pulls the permit and schedules the inspection.
A whole-house switch installed at the meter sometimes needs the utility to disconnect and reconnect service. National Grid serves much of the Capital District, and the installer coordinates that with them. Skip any installer who suggests doing the work without a permit: the inspection is the check that the switch is wired to keep your generator off the grid.