We had a transfer switch installed to run the well pump during periods of no power from a generator. I love how I can keep the generator in the back yard behind a fence and run a cord to the pump, about 45 feet away, so generator is safe behind a fence, makes it harder to steal the generator when I'm in the shower. This is a 3 prong L5-30 ends rated at 120 volts. This will not run 240 volts as that has a different plug.