A shock also can cause the user to fall off a ladder or other elevated work surface. One end of the grounding conductor connects to the tool's metal housing. The other end is grounded through a prong on the plug. Anytime an adapter is used to accommodate a two-hole receptacle, the adapter wire must be attached to a known ground. The third prong should never be removed from the plug.
Double insulation is more convenient.
Gloves and safety footwear are recommended during use of electric tools. When not in use, tools should be stored in a dry place. Electric tools should not be used in damp or wet locations. Work areas should be well lighted. Powered abrasive grinding, cutting, polishing, and wire buffing wheels create special safety problems because they may throw off flying fragments.