The wear caused by repeatedly trying to shove the larger blade of a polarized plug into the smaller slot of an extension cord’s female plug can make it difficult to identify the larger slot. Club member Jim Butler of Knoxville, Tennessee, keeps his slots straight by painting a white circle around the larger one (that’s where the white ground wire is connected) when the cord is new. This makes it easy to see which slot should receive the wider plug blade.
How to Identify the Ground Plug
Featured Article, Household DIY TipsBy American Profile on January 29, 2013