Can I use a plug without holes?
Plugs are safe with or without holes in the prongs. Type A and B plugs have two flat prongs with (often, but not always) a hole near the tip. In some sockets, there are two spring-action blades that hold the sides of the plug pins and prevent the plug from simply slipping out. Since 1965, ungrounded type A outlets are not permitted anymore in new constructions in the United States and Canada, but they can still be found in older buildings.
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