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

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 ...

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.

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… ...

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).