When the electric grid system was developed in the late 19th century, in-home wiring was done around existing pipes. Because of this, electricity was harder to access, and people used it mostly for lighting. The few appliances that were invented during this time were either hard-wired to the building or connected to a light socket.

But as more electric appliances were introduced, enhancing the system's usability and reliability became a big concern. Harvey Hubbell invented the two-pronged plug and wall outlet in 1904 so that people could easily plug things in. Following this, Philip Labre invented a third ground prong in 1928 to enhance the safety of the electric plug. The addition of a third prong meant that any excess charge from a short circuit could be safely discharged into the ground, instead of the people using the appliances.





Your living room wall outlets are based off of an 80-year old invention. Now that's OLD!