10 Shocking Wiring Dangers That Could Set Your Home on Fire!
8. Backstabbed Wires

What It Means: On newer switches and receptacles, wires that are pushed into the back of the device are more prone to loosening compared to those that are securely attached around screw terminals.
Code Violation? No. This practice is still allowed, even in new construction.
Danger Level: It varies. At the very least, loose wires can cause a receptacle or switch to malfunction. In the worst-case scenario, they could lead to a fire.
Solution: To check for backstabbed connections, remove the switch or receptacle from its outlet box. If one wire is backstabbed, there are likely others. Release the wires and secure them to the proper screw terminals on the receptacle.