I went to plug in my vacuum and noticed this weird brownish discoloration on the faceplate. It won’t wipe off and feels a little warm to the touch. Is this just dirt or something else?

Typically, the National Electrical Code (NEC) specifies that outlets should not exceed a temperature rise of 30 degrees Celsius above ambient temperature. If an outlet feels warm to the touch, it might be exceeding this limit, which can result in damage to the outlet and surrounding areas, manifesting as burn marks or discoloration on the faceplate.

3. The Role of Loose Connections, Backstabbed Wires, and Worn Receptacles