Consumer Reports explains how a transfer switch or interlock device works, so your portable generator is ready for the next storm.

If your house already has a transfer switch and you’ve got a smaller generator that’s compatible, you can use that, though you may have to limit which appliances you power with it.

Jump to: Wattage, Volts, and Amps Evaluate Your Power Needs Safety First How to Connect a Generator to Your House Using a Transfer Switch Using A Breaker Interlock Make a Plan And Test Often FAQ ...

Without a transfer switch, you can only use a portable generator’s built-in outlets, which can power some appliances and electronics through an extension cord (for more, see below).

When the power goes out, you flip off the main switch with power from the street, slide the little interlock device up, and flip on the circuit breaker, which allows the generator to power any of ...

If you connect a generator to your home’s main electrical panel when the power goes out, you need to make sure the main breaker is shut off. Otherwise, when the power comes back on, you (or t… ...

If you plan to perform the related task of connecting a generator to your home, you might not need a transfer switch at all, though. You can instead use an interlock plate which is even simpler ...