Back in 2009, I wrote a blog post giving some basic information on how to fix ungrounded three-prong outlets. That info is still mostly applicable today, but I have a few updates.

Plugging in an electronic device that has three prongs into a two-prong outlet (like with an adapter) could present a serious ...

Most outlets will accept either 2-prong or 3-prong plugs. If the home has older wiring, the third hole (the “ground”) may not be present.