Quote Originally Posted by JLMCDANIEL View Post
Ground wires provide almost no personal safety while GFCI's do. About the only place you really need to add aground wire is outlets where you will be connecting electronic equipment with 3 pronged plugs. Ground is used to filter off electrical noise.

The ground wire is for personal safety. For any appliance with a metal chasis, the ground wire is connected to it. It is there in the event that a live wire comes in contact with the metal chasis and energizes it. Should that happen, the current will flow back to the panel and trip the breaker. If this path was not there, any person who came along and touched the metal chasis would be electrocuted.

There have been many electronic devices made without a third prong on their plugs as well. I would also note that fluorescent light fixtures require a ground connection to work as well.