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Ground Wire.

A ground wire is a wire that is literally connected to the earth and acts as a backup in case a neutral wire fails. Without one, the risk of electrical shock becomes a viable possibility. Ground wires are usually green or yellow in order to differentiate between neutral wires and hot wires, and therefore it is easy to tell the difference between it and other wires.

參考資料 http://www.wisegeek.org/what-is-the-ground-wire.htm

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