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The page below is a sample from the LabCE course OSHA Electrical Safety. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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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 for the person operating the equipment. A 3-prong plug, as shown in the image on the right has a grounding wire connected to the third prong (indicated by the arrow). When plugged into a 3-prong wall receptacle the grounding wire connects from the electrical circuit to the equipment.
All laboratory instruments and appliances must be adequately grounded.