What must be done with cardboard pieces used to secure No. 6-32 screws when installing wiring devices in a metal outlet box?

When installing wiring devices in a metal outlet box, ensuring proper grounding and avoiding any potential hazards is critical. Cardboard pieces used to secure No. 6-32 screws serve as temporary insulation to prevent metal parts from grounding accidentally during installation. Once the installation is complete, it is essential to remove these cardboard pieces. Leaving them in place could create a fire hazard or resistor to the proper grounding of the outlet box, which is necessary for safe electrical operation.

By removing the cardboard, you ensure that the metal box is properly grounded and that all connections are secure, preventing electrical malfunctions.