I needed a good way to show the actual contact surface area of the clamping socket on a NEMA L5-30. I grabbed some sheet metal the same thickness as the plug pin and inserted the socket over it. I then slid it back and forth thus creating a corresponding mark on the sheet metal showing the actual contact area. The results were, well, SHOCKING!


It should be noted that this was not the dimple side but the non-dimpled side!!