What type of screw is acceptable for attaching receptacles or covers to outlet boxes according to NEC 314.25?

The National Electrical Code (NEC) 314.25 specifies that receptacles or covers should be securely attached to outlet boxes using an appropriate type of screw. The correct choice, which involves using machine screws that match the thread gauge or size integral to the box, ensures a proper fit and secure connection. This is crucial since the integrity of the electrical system relies on solid connections to prevent malfunctions or hazards.

Machine screws are designed to fit into pre-tapped holes in the boxes and provide a reliable fastening mechanism that can withstand the stresses and vibrations often encountered in electrical installations. This adherence to specific types of screws aligns with safety standards, as it helps in maintaining the overall functionality and safety of electrical devices installed within the outlet boxes.

In contrast, using drywall screws, wood screws, or any available screws could pose risks. They may not fit securely or might not be suitable for the application, potentially leading to loose connections or compromised equipment, which can create safety hazards.