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A house ground is easy to find, all you have to do is look outside at the power feed coming in, there should be a thick bare wire coming down the side of the structure that attaches to either a steel pipe or a thick rod, driven into the ground. The neutral is tied to earth ground for lightning protection and to provide a path for any high voltage leakage from the power company's step down transformer. The ground is tied to the neutral to provide a return path to trip the breaker in the event of a fault. The main breaker box should be the only point where neutral/ground need to be connected, never at the outlets or other places in the electrical system.