What is the difference between a tool with external grounding and a double-insulated tool?
What will be an ideal response?
A tool with external grounding has a wire that runs from the housing through the power cord to a third prong on the power plug. When this third prong is connected to a grounded, three-hole electrical outlet, the grounding wire will carry any current that leaks past the electrical insulation of the tool away from the user and into the ground. In most electrical systems, the three-prong plug fits into a three prong, grounded receptacle. The green (or green and yellow) conductor in the tool cord is the grounding wire. Never connect the grounding wire to a power terminal. A double-insulated tool has an extra layer of electrical insulation that eliminates the need for a three-prong plug and grounded outlet. Double-insulated tools do not require grounding and, therefore, have a two-prong plug. In addition, double-insulated tools are always labeled as such on their nameplate or case.
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