When attaching receptacles or covers to outlet boxes, what type of screw is acceptable per NEC 314.25?

• A. Drywall screws
• B. In accordance with the manufacturer's instructions
• C. Machine screws matching the thread gauge or size integral to the box
• D. Either B or C

Answer: (D)

The key idea is using hardware that is appropriate for electrical devices and fits the box. NEC 314.25 allows mounting screws to be used either as specified by the device/manufacturer or as machine screws that match the thread size built into the box. This ensures proper fit, secure attachment, and safe operation. Drywall screws aren’t acceptable because they aren’t designed for electrical fittings, may have the wrong thread, can damage the device or box, and aren’t rated for electrical use. So the acceptable approach is to follow the manufacturer’s instructions or use machine screws that match the box’s threaded openings.