Use a 12-gauge (or thicker) extension cord for your sump pump.

Yes, the gauge matters more than the length.

Most sump pumps pull 6–10 amps, but the startup surge can spike higher. A standard 16-gauge household extension cord will drop voltage over even a short distance, making the motor run hot and fail early. At best it trips the breaker. At worst it burns the pump out when you need it most.

For any critical equipment—sump pump, freezer, space heater—go with 12-gauge for runs up to 100 feet, or 10-gauge for longer runs. Look for a cord rated for outdoor use (even if it’s indoors, because basements are damp) and make sure it’s three-prong grounded. Never use a two-prong or a cheater plug.

The extra few bucks for a thick, rubber-jacketed cord is cheap insurance against a flooded basement.

Don’t trust something that costs fifteen dollars to protect something that costs five hundred.