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A ground is a conducting connection between an electrical circuit or equipment and the earth, or between an electrical circuit and some conducting body that serves in place of the earth.
The purpose of a ground is to prevent the buildup of voltages that may result in a hazardous situation for the connected equipment and/or for the person operating the equipment.
All electrical equipment in the workplace that is not clearly marked as "double-insulated" must be grounded by using a three-pronged power cord.