A transfer switch is a critical safety device that allows you to safely connect a portable generator to your home’s electrical panel. It physically prevents utility power and generator power from feeding into the panel at the same time—a dangerous condition called “backfeeding,” which can electrocute utility workers and damage your home’s electrical system. Types include manual transfer switches (you flip a switch) and automatic transfer switches (ATS) used with standby generators. Installing a transfer switch is a job for a licensed electrician and is required by most electrical codes. The switch’s amperage rating (e.g., 30A, 50A) must match your generator’s output and the circuits you need to power.

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