What if all the plugs in my house have only two slots instead of three?

Before revisions of the code, a separate ground was not required in most applications. Now, a separate ground is required by code. (the third slot in plugs) It is also much safer to have this type of plug. The plugs that have two slots can be changed out with new plugs with three holes, but a ground will not be present. The correct fix for this is to bring a separate ground wire to the plug and change the plug out to a new style plug.